Why is my home phone not working? Typical malfunctions of PANASONIC cordless phones Malfunctions in a home telephone with a Panasonic handset

One of the reasons for the refusal of a home phone may be a banal non-payment. You can check the existence of a debt or report a payment by service phones indicated on the accounts, as well as in personal account on the site telephone operator. Please note that if your phone is disconnected due to non-payment, it may take up to a day to reconnect after making a payment.

To avoid this situation, pay your phone bills no later than 20 days from the date of receipt. Please note that if the payment was made after the 28th day of the month, then it will be credited to your account only in the next. Do not forget that you can pay for the phone even before receiving a receipt, after the 7th day of the month at any branch of Sberbank. To do this, it will be enough just to give your phone number.

Machine malfunction

Perhaps the breakdown occurred directly in your . To check this, try reconnecting it, for example, with your neighbors, or connect another device to the existing wires.

If you have a radiotelephone, it is also possible that it is in the handset and needs to be replaced with a new one. The less the tube keeps "charging" outside the base station, the less power is left.

Understanding wires

A telephone cable (usually white) runs from a common electrical panel to the apartment, where it is connected to a small telephone socket, and from it a separate wire leads to the telephone. Also, most modern phones are connected to the network. Check the places of all connections: socket 220V, telephone socket. Perhaps, in one of the junctions, the cable simply fell out of its "nest". If everything is in order, it is worth checking the wire all the way from the telephone jack to - it may be torn or pinched. This happens quite often, especially if the cable is laid under the thresholds of the entrance to the rooms, there are children and pets in the apartment.

In the event of a break, this breakdown can be completely corrected on your own: the wires will need to be cleaned a little and twisted in pairs again among themselves, and then fastened with electrical tape. At the same time, you will not be shocked by the current, besides, the polarity of the telephone wires is absent, which means that you can not be afraid to connect them incorrectly.

Other possible malfunctions

Here are some more of the most common customer complaints and how to resolve them:

Crack, rustle, noise. These are the “symptoms” of a telephone line failure. In this case, it is also worth checking all the wires, and if they are intact, contact the telephone company.

hard to hear. Most likely, the problem arose in the dynamics of the device. If the phone is old, then the speaker is carbon, and sometimes it’s enough just to knock on the receiver. If the phone is modern and the volume is set to “maximum”, but you still can’t hear anything, you will have to contact the master or replace the device with a new one.

The phone does not respond to button presses. Perhaps they were just messed up. Try to remove the cover and wipe the button mechanism as gently as possible with alcohol.

In detail: do-it-yourself repair of a Panasonic wireless phone from a real master for a website website.

The digital cordless telephone handset may require repair. Complaints: when dialing a number, you have to apply more force than usual when pressing the keys. If you do not pay attention to such an inconvenience and continue to train your fingers and the stability of your nervous system, then over time some keys will generally stop responding to pressing with any force. And then we conclude - the handset is broken. Need to take it in for repair or buy a new one. Such a "diagnosis" for a handset does not always require paying for the work of a master in the workshop or buying a new handset. Here's how I solved this problem myself at home, spending only about thirty minutes. Such actions are within the power of any person who knows how to hold a screwdriver in his hands.

Panasonic digital wireless telephone answering machine. Manufacturer: Kyushu Matsushita Electric. But the handset can be of any manufacturer. All such handsets have a similar device. And the cause of the malfunction is this case everyone can have the same - there is no contact between the rubber contacts of the keys and the contacts on the phone board.

Unscrew the fixing screws on the case back cover. In this model, they are located under the cover of the compartment that covers the AA batteries.

Remove the compartment cover, remove the batteries. (see photo)

We unscrew the fixing screws with a screwdriver.

And in the upper part of the case, we slightly delay it with a screwdriver in order to remove the plastic part of the case from the latch.

When removing half of the plastic case, such a part may fall out. (see photo)

We can easily put it back in place. (look at the photo)

Then we unscrew the screws securing the board.

And in these places (look at the photo, the screwdriver indicates) there are latches for fastening the board. Pry slightly with a screwdriver and remove the board.

So we got to the contacts that just need to be cleaned, which we do.

We assemble the tube in the reverse order. And the dial buttons work like new again! And I will also give such advice on the use of batteries. Place the handset on the charging base only when the battery alarm sounds. This will extend the life of the batteries.

Attention!

Manifestation of a malfunction: a weak glow of the indicator, a message about a bad battery although it is fully charged. Defect in diode D1 according to the scheme. How to find: check for a supply voltage of 5.5 volts at the anode, the voltage at the cathode should be 5.2 volts. If the voltage at the cathode is below 4 volts, then the diode must be replaced.

2). "PANASONIC" models 3611, 3621.

There is such a defect: There is no connection between the tube and the base - the reason for this is a poorly soldered output of the transmitter quartz in the tube.

3). In the PANASONIC answering machine model 4311.

During normal operation of the handset and base, malfunctions in the operation of the AO are observed - the reason for the increased pulsations of the PSU.

4). Panasonic 9080 and similar.

During operation, a crash is heard that disappears (for a while) after impact or disassembly. Reason: poor contact in the connector between the RF unit and the board.
Repair: 1). each pin of the connector is carefully rotated 90 degrees.
2). unsolder the connector and solder pieces of tinned wire in its place

To change the TONE PULSE mode, press the following key combination.
1 program
2AUTO
3 Press # 2x to select PULSE mode
to select TONE mode, press * 2 times
4 PROGRAM

The handset does not work, while there is a keyboard poll - the zener diode D17 flew out on the power MX;

KX-TS900 and similar: the short range has become - the filter at 903 MHz “leaks” in the tube;

KX-T9500: unstable tube-base connection, but the base-tube is excellent - the noise detector in the pipe is naughty. Treatment - filter replacement at 455KHz;/p>

KX-T7980, 9050, 9080, 9280: there is no connection between the handset and the base due to the frequency drift of the transmitter or receiver (the defect is common with 3-4 year old devices) - the tuning capacitors in the RF unit have oxidized;

KX-TS408 and similar: it is impossible to adjust the transmitter frequency - the varicap needs to be replaced.

eight). Defect in Panasonic KX-T9050, KX-T9080.

There is no or unstable connection between the base and the handset. I recommend setting up RF blocks, this is done as follows:

Handset: We solder the jumper to enter the test mode, press the Pause button (noise is heard in the speaker). By rotating the trimmer capacitors TX and RX, we set the voltage to 1.8v at the VXO test points for TX and RX, respectively. For this operation, it is desirable to have a repair cable, but you can do without it by soldering to the test points with a short piece of wire (the control points are on the underside of the RF block) It is convenient to control the voltage with an oscilloscope 0.5v / div. The setting is quite “sharp”, it is necessary to rotate the trimmers with a dielectric screwdriver. I use screwdrivers made from a strip of fiberglass with the foil removed and sharpened accordingly. It is also useful to adjust the 12.800 MHz reference oscillator. We connect the base to the phone. lines, establish a connection, use an oscilloscope to watch the signal at the output of the tube discriminator - 400Hz.- line tone. By rotating the trimmer, we achieve the maximum undistorted signal amplitude. By adjusting the discriminator circuit, we achieve the same. Base: Configured in the same way. To enter the test mode, three counters are shorted. point, then power is applied. Tighten all screws in the RF blocks well before adjusting.

Fault: very quiet audibility of the subscriber in the handset. The connection between the handset and the base is established normally and the signal from the handset microphone, in intercom mode, is heard on the base normally. To determine, in this case, where the malfunction is in the handset and base is very simple. Suppose your handset and base are connected to each other (in the same intercom mode), at this moment it is necessary to de-energize the base (remove the power supply of the base from the socket) and if you hear a loud noise in the handset, then the fault must be sought in the base. In addition, indirectly, loud clicks from its speaker indicate the serviceability of the handset when you dial a number. My fault was caused by poor metallization of the via in the base, between components R27, C11 (pin 15 of IC4). By lightly pressing a screwdriver on the board, it was possible to localize the malfunction.

Fault: No communication between handset and base. As I was told, 12V was connected to the tube instead of 4.5V. But the handset turns on and searches for the base. As a result, only transistor assemblies Q14 and Q15, as well as diode D13, turned out to be faulty (that is, power was not supplied to the radio frequency unit).

eleven). All cordless phones type Panasonic KX-T7980. 9080.

Malfunction: during a conversation and at the same time as you move, unpleasant rustles are heard in the handset. The antenna turned out to be faulty (it was less necessary to pick in the ear). The “spring” of the antenna is inserted into a brass adapter, on the other hand, a plate with a hole is inserted into the adapter. It is necessary to move the antenna and if rustles are heard in the tube, then you just need to compress this adapter, but not much, otherwise it may burst. If it still bursts (or compression does not help), then it just needs to be properly soldered.

thirteen). Panasonic KX-T9000, KX-T9080.

The handset does not work or is fooling, there is no connection with the base. Check the power to the circuit after the three-pin IC6 chip, if less than normal, change it.

14). For all Panasonic Type 408 cordless phones.

The connection between the handset and the base is lost due to the following reasons:

The handset-base connection is lost. Defect in the charge contact group on the base, - (contacts are connected to the tube through a switch on springs?!). During operation, the connection fails and, of course, the PIN code fails. And it's hard to understand!

The range of 1.5-2 meters has greatly decreased. In the handset, when establishing a connection, even on short distance faint noise is heard. I calculated that the malfunction is in the tube (in the radio receiving path). Usually, the URF is to blame for the decrease in sensitivity (it knocks out a field-effect transistor (most often in Panas) or a bipolar one (this is exactly what it is here). Replacing the transistor did not give a result. Further, only m / s TB31224F- 1st mixer, 1st local oscillator , 2nd mixer, etc. to the demodulated signal.Since replacing it is problematic, I tried to replace the filter at 455 kHz.The problem turned out to be in it.

During the repair process, I encountered a tube malfunction, the processor does not start and does not respond to button presses. It turned out that it was flashing the D15 diode from the battery to the charging mark. As a result, Q15 opens and the handset thinks it is on the base. Ringing by a tester does not leak. Thus restored 3 devices.

If the range decreases, then first of all it is necessary to check the band-pass filter in the tube (pos. designation FL405). Almost 100% he is dead.

19). Panasonic KX-T9050B, KX-T9080BX, KX-T9000, KX-T9100, KX-T9200, KX-T9150, KX-T9250.

Feature: Noise while talking. Reason: When the battery is discharged, the voltage changes, which causes noise in the handset. Elimination. Change the resistance value R87 6.8kOm to 12kOm.
Service technical support Panasonic.

twenty). After a breakdown of the shutdown mechanism (Panasonic 7980 handsets and the like).

Structurally combined with the axis of the hinged lid, I, having analyzed circuit diagram tube, I used a conventional reed switch with normally open contacts to control the tube. I placed the reed switch in the area of the LEDs of the tube under the board, fixing it on the light guide so that its axis was located along the tube. In this position, the reed switch is most sensitive to the magnet, which is located at the end of the hinged cover. I used a rectangular magnet from a magnetic furniture latch, it did not require any refinement. The standard switch is shorted with a drop of solder. We connect the reed switch with one end to a common wire (-), the second to the 60th leg of the processor (it is better to solder to R105, which can be found on the left edge of the board: one of the contacts of the standard switch is connected to two resistors, one (R49) to a common wire, the other (the desired R105) to D18 and the 60th leg of the processor). When the tube cover is closed, the reed switch provides a low level on the 60th processor pin corresponding to the CLOSE mode.

21). PANASONIC KX-T408 radiotelephone and similar.

Attention! If you have relevant information, please share it with us! After all, the information content of this subsection depends on you.

At a cursory examination, the symptoms of both victims of the fire turned out to be similar, a complete refusal to start - there was no characteristic “beep” when power was applied and broken inductances at the input of the telephone line.

The problem seemed to be insoluble. But after the diagnostics (I remind you that before that the radiotelephones were being repaired in a couple of workshops), it turned out that the 1117S power stabilizer, which supplies power to the 3.3V processor, was to blame.

Having run through a couple of stores and heard that this microcircuit is not even in the price lists and it will take a long time to wait for a new one, I bought the good old LM317. I assembled a simple stabilizer and turned it on instead of the above microcircuit.

The phone responded with a joyful “peak”.

I replaced the input inductances and checked the transistors of the set - everything is fine, the radiotelephones have earned.

And it became another successfully animated device more :) Best regards, UR5RNP.

SIEMENS radiotelephone Gigaset 1010 handset is on the PIN code, the code is naturally unknown. solder EEprom 24c04, read it Poni Programmerom and look at the addresses: 27 and 28 is the coveted PIN in explicit form.

Panasonic KX-T9080, 9050 You can check the operation of the base and handset transmitters as follows: we make a load equivalent: We remove a 1.5v backlight from an unnecessary wristwatch, solder a small piece of 50 Ohm coaxial cable to it and connect it to the output of the RF unit instead of the antenna. With a working transmitter, the light should glow brightly at 30mW.

Cordless telephone PANASONIC KX-T408 and similar.
In several devices of this type, a defect was found, the external manifestation of which was as follows: with a good battery, the handset did not react in any way to pressing the keyboard buttons. When checking with an oscilloscope, it was found that the 32.768 kHz clock generator was working, and there were high levels voltage instead of low. The reason is a break in the printed conductor connecting pin 3 of IC3 with pin 33 of the microcontroller. We measure the voltages at these pins, which should be the same and have a level of about 3.5V. If the voltage level is low at pin 33 of the microcontroller, we connect the indicated pins with a jumper from the MGTF wire.

As a result of increased voltage in the mains, varistors often fail. They are used for surge protection.

Apparatus Samsung CK-5341ZR.After some time after turning on (from 15 minutes to several hours), the setting starts to go away, or when switching from channel to channel, sometimes it does not capture the station. I adjusted the APCG circuit (it is the only one in the TDA8362 harness) - it did not help. I replaced the 31 Volt zener diode (in the tuning circuit) - it did not help. I changed the TDA8362 itself - no result. I changed the memory (24C02) - it did not help. I wanted to change the control processor (SIM-135-2R С69540Y), but it is very expensive. The owners were in a hurry, and the iterations were long. Therefore, I filtered the low-voltage supply voltages, the tuning voltage with semiconductor capacitors and changed the tuner itself. It's been two months now and the machine hasn't failed. Unfortunately, I can’t pinpoint the exact reason - either the tuner itself, or they knocked down the power ripple setting. The fact is that before that I was repairing a Soviet TV with a built-in remote control for 55 channels, and its settings also went astray, so the reason turned out to be that I lost part of the capacitance of the 470 uF / 25 V electrolytic capacitor at 12 Volts in the MP-power supply 3-3. The SAA1293 processor in the remote control was also powered from the same voltage. The loss of capacity did not affect the image in any way.

Panasonic KX-T9000, KX-T9080: The handset does not work or is fooling, there is no connection with the base. Check the power to the circuit after the three-pin IC6 chip, if less than normal, change it.

PANASONIC KX-TCD951: you can not register a pipe - solder a flash drive in the database
LG GT-7101, SEIMENS GIGASET: segments disappear on the indicator - solder the indicator cable through thick paper (whatman paper)
PANASONIC KX-TC1019: there is no connection between the handset and the base - register the pipe. The 5-digit code is indicated on a paper label (in the base, short-circuit R909 next to the process and turn on power, press 2.7, # on the pipe and turn on power, dial the code. If everything is OK, the pipe will go into talk mode)
PANASONIC-and with a lever on the base at the charging contacts: no charging or matching - solder the contacts by removing the springs
LG GT-7320: you cannot exit the Direct Call mode - there is an inaccuracy in the instructions in Russian - exit by double tap(for 0.5 sec) microphone mute buttons
SIEMENS GIGASET, BT: no line - often used 2 and 5 pins in the telephone jack
LG CT-9130 and GT-7101 use different polarity on the contacts in the power supplies
PRIMER, SANYO CLT, CLA: in case of failure of the reed relay, it is possible to replace the reed switch itself with a domestic small-sized one
LG GT-9130A: noise in the pipe - replacing the 3.99 MHz quartz in the pipe with quartz in a metal case can help
PANASONIC-and new models (not DECT) when a pipe enters the water under the process, a conductive blot is formed in 98% of cases

For all Panasonic cordless phones type 408, the connection between the handset and the base is lost due to the following reasons:
1. Big ripple B.P. and because of this, the handset does not exchange a PIN code with the base. The malfunction is eliminated by replacing the 470 Mkf capacitor with 1000 Mkf or more in the PSU.
2. Failure of the zener diode in the charging circuit of the handset, the batteries are charged to an overvoltage and the handset and the base do not exchange a security code (PIN code).
3. Do not exchange PIN due to dirty contacts on charger base or because mechanical damage these contacts.
4. The filters in the radio channels of the base and handset are out of tune. Many tuning methods have been described if normal frequency analyzers are not at hand. I suggest another one, for those models that have a Speaker button on the base. If you put the handset on the base, press this button on the base, and then pick up the handset, then the algorithm for connecting the handset to the base will be executed. But with detuned radio channels, the passage of speech signals is not audible. It remains in this position to adjust the filters and achieve the passage of both voice and telephone line signals.

If in the company's radiotelephones Panasonic KX-T9080 or similar ones (hinged cover) there were problems: the stem broke or the cover broke, then it can be modified using a simple device assembled on the K561LN2 chip. This is the most original and simple solution to the problem that I have ever seen. The device is easy to assemble, it works very well, it has no failures. The cover and stem can be bought, the price of the complete cover (cover, cable, microphone, bell) costs about 1000 rubles, the salum stem will cost 300 rubles. Very often you meet customers who refuse to replace expensive components. And you lose money and a client.

In these phones, the call can replace the actual earpiece. With the help of a fluoroplastic wire, it is necessary to connect the negative terminal of the capacitor C40 (it is decoupling between the generator of the ringer circuit and the emitter itself located in the phone cover) with the contact P of the headphone, in Figure 1 there is a red dot.

2. Scheme replacing the S2 button (this button turns on the handset when the cover is tilted)

The circuit figure 2 is assembled on a K561LN2 chip. Moreover, only the 14th part of the microcircuit is used. Electrolytic capacitor C1 47 microfarads from 6.3 to 16 volts. used in the circuit should be small, for the convenience of placing it in the tube body. SMD type resistors are mounted directly on the chip. The S3 button is the microphone mute button. The tracks from the button to the phone circuit need to be cut. The places where the tracks were cut are shown in Figure 3 by red crosses.

Leg 7 of the microcircuit must be connected to the body of the telephone circuit in any convenient location. Leg 14 of the microcircuit must be connected to a switch that turns off the handset. Figure 5, the connection point is shown by a red dot.

You can use the old microphone, which must be removed from the socket in the cover. You can fix it in the hole that remains in the tube body from the stem. When unsoldering the microphone, observe the polarity. The minus of the microphone is connected to its body. Figure 6 shows the microphone connection points.

Figure 6 shows the connection point of tap S2, see diagram.

You need to place the switch circuit under the phone board in the area of \u200b\u200bthe head phone. None advanced settings schema is not required.

3. How the modified tube works. When you receive a call on the handset or, if necessary, make a call, you must press your thumb on the button that previously performed the function of mute the microphone. After the end of the conversation, the button must be pressed again. The handset will go into standby mode.

This modification has been tested on several models of Panasonic phones. For two months, not a single complaint was received from the owners of the converted devices.

We are still waiting for such letters from you, with personal experience for repair household appliances
Dimon

Restoring the lock of the battery compartment cover of portable handsets

When operating and repairing portable handsets of cordless telephones (CBTs) from PANASONIC and other manufacturers using a similar housing design, it often becomes necessary to restore the lock of the battery compartment cover. The latch tongue of the lock is made of plastic in the form of a protrusion on the lid and often breaks off if the tube is carelessly handled or dropped. This problem causes a lot of trouble for users and repairmen, since various restoration options using glue, plastic inserts, etc., as practice shows, are short-lived. As a result, the lid has to be fixed with tape.

A more reliable, simple and proven recovery method that does not require a lot of time is offered. The additional parts installed in this case, as well as the places of their attachment to the cover, are shown in Fig. 1a and 1b. The main part is a metal spring plate 1, which will serve as a latch. It must be made independently in accordance with Fig. 2 for Panasonic KX-TS418 handsets, etc., or by changing the dimensions for a specific model. The plate can be made from beryllium bronze by heat treatment of the blank, or from any suitable metal, for example, springy contacts from a relay, etc.

Rice. 1. Installation of additional parts, as well as the places of their attachment to the cover

Two holes about 1 mm in diameter are drilled (or punched) in the workpiece, and then the latch tongue is bent. The plate is attached to the inside of the lid using a conventional clerical bracket 2 (Fig. 1). Beforehand, two holes 3 with a diameter of about 1 mm are drilled in place in the lid, between which, using a cutting tool (for example, the sharpened end of a needle file, or a piece of a hacksaw blade, etc.), a shallow groove is cut so that the bracket does not protrude from it. Hole 4 with a diameter of 1.5-2 mm is drilled at the edge of the lid so that through it it is possible, by pressing on the plate from above with some metal rod (for example, an awl, nail, etc.), press the latch and open the lid.

Checking and repairing antennas of PANASONIC portable cordless phones

In many PANASONIC BSHT models operating in the frequency range of 30-50 MHz, a helical antenna is installed, the design and appearance of which with the case removed are shown in fig. 3. During operation, often due to negligence, an excessively large bending of the antenna and its deformation are allowed. As a result, the wire of the internal extension coil is broken. The normal operation of the phone is disturbed, noise appears, the range decreases, the quality and reliability of the connection between the handset and the base decreases. Without knowing this reason, some radio mechanics begin to look for a malfunction in the handset or base radio channel blocks. Since the tube antenna is flexible, it gradually returns to its normal position and outwardly signs of deformation become invisible. Therefore, before proceeding with the repair of the electronic part of the BSHT, it is necessary to check the health of the antenna.

Rice. 3(a,b). The device of the antenna and the appearance of which with the cover removed

Indirect evidence of its malfunction is a decrease in field strength, especially around the top of the antenna. This can be determined using a field indicator or a high-frequency voltmeter (if its remote RF head with a specially elongated probe-antenna about 50 mm long is brought to the upper end of the antenna 5). To carry out such a check, it is necessary to have some experience in repairing the BSHT of these models in order to compare the relative readings of the devices with a working and faulty antenna, as well as the RF voltage values directly at the transmitter output.

A similar homemade spiral antenna, fig. 4, can be used instead of a broken telescopic one (for example, in the KX-TS1025 model and others). As practice has shown, it is inconvenient to use a tube with a telescopic antenna, since the latter quickly breaks down. For replacement, a spiral is inserted into the plastic case on the tube (Fig. 4b), soldering its lower end to the metal base 4, which remains from the broken telescopic antenna.

Rice. 4. Homemade spiral antenna

A metal plug 5 is soldered to the upper end of the spiral, which is inserted from above into the opening of the cover b. For this, a short bronze or brass screw with an M4 or M5 thread is suitable, preferably with a massive head. The range of the BSHT with such an antenna may decrease slightly, but it becomes much more convenient to use the handset. If the antenna is in order, the fault should be sought in the radio channel blocks of the handset or base.

BSHT malfunctions associated with design and manufacturing deficiencies of blocks and components

Cordless phones from PANASONIC can be conditionally divided into several generations by series, each of which is a modified version of the previous series. That is, despite the different functionality models provided by control units, display units and various additional digital storage devices, we can talk about their serial versatility, according to the operating range of 40 or 900 MHz. This provides high potential reliability and durability, not only due to good performance, but also due to high maintainability. In practice, this potential can be realized only under the condition of careful operation, timely qualified maintenance and repair.

For example, if the user allowed moisture to get inside the tube onto the board and did not turn off the battery (and did not contact the workshop in time), repairs may become impossible or not economically feasible. The same can happen if an additional malfunction occurs due to inaccuracy and errors when trying to unqualified repairs, for example, when checking the modes on the outputs of microcircuits (especially a microprocessor) and accidentally shorting them; from exposure to static electricity through tools; when using separate mains-powered measuring instruments that are not connected to a common ground bus; when using a conventional soldering iron that does not have an isolation transformer. This is only a part of the most common violations allowed during operation and repair.

This often happens with handsets of models KX-TS155V, KX-TS157V and those close to them in terms of constructive device. For example, in many PANASONIC handsets, as a result of strong pressure on the bottom buttons of the keyboard, the conductor under the contact layer of the FLASH button often breaks. As a result, in addition to this button, the keys 1, 2 and 3 do not work either. Sometimes this happens in other models with different contact pads and jumpers applied in the same layer on the typesetting field of the boards. Attempts to restore contact by stripping this layer and soldering, etc. have no success. As practice has shown, in these cases, the most reliable method of repair is to restore the necessary connection from the back of the board. In this case (for models KX-TS1558 and KX-TS1578V), pin. 8 of the microprocessor (CPU) must be connected to the anode of the diode D34 or to a conductive pad on the board, as shown in fig. 5. For this, it is better to use a piece of PEV-2 wire with a diameter of 0.12-0.15 mm.

At present, cordless telephones of the KX-TSYUHX, KX-TS14XX, KX-TS15XX models are widely used, the operation and device of which are described in detail in, as well as other, more modern models of this generation, similar to them in terms of design and set of electronic components used . They, in particular, use small-sized flat dynamic heads, for example, PQAX3 P23 ZA.

The resistance of the windings of these heads is from 110 to 150 ohms. A significant part of the problems that arise during operation are associated with them. Firstly, the winding of the moving coil of the heads is made with a thin wire, which often breaks. In this case, it becomes necessary to choose a replacement head, since it is difficult to purchase the original. Suitable in terms of resistance is the DEMSh-1a capsule of domestic production. To install it in the tube, the capsule must be removed from the plastic housing. Then, the capsule leads are carefully soldered from the clamp contacts and extended with PEV-2 wires with a diameter of 0.15 mm. metal case the capsule around the perimeter is wrapped with electrical tape or tape. The wires are laid by gluing them with glue on the sides over the electrical tape. Install the capsule in the center of the tube head socket. So that it does not hang out, the free space between the walls of the nest and the primer is filled with a strip of foam rubber rolled into a ring, which is also fixed with glue. In this way, several pipes of various models were restored. The sound quality was rated as good by users.

In order to better understand the reasons for the frequent failure of branded heads of this type, it was necessary to study their design. It turned out that inside the head there is another coil (Fig. b), located along the edge of the case and wound with a thicker wire.

Rice. 6. Coil inside head

Petrov I.A. PANASONIC radiotelephones. Device and repair. M., 2003, MRB, issue 1259.

Alla / 08/08/2016 - 09:38
hello! I also have this problem: the phone is charging, but there is no connection, there are no sticks, what could it be? write who knows the answer! thanks!
ANDREY / 05/02/2016 - 21:35
Panasonic KX-TGA820RU when dialing a number, there is a long beep, tell me the possibility of correcting it at home 8916 375 6970
Hope / 01/03/2016 - 20:04
After charging, when you remove the handset from the base, the light on the handset is on.
Hope / 01/03/2016 - 20:02
I have a light bulb on the handset after charging. What it is?
Victor / 06.10.2015 – 23:00
Panfsonik KX-TGA110UA radiotelephone - after charging, the indicator on the display shows that the battery is discharged (although when checking it turns out that it is fully charged) and when you turn on the phone, it immediately turns off. Tell me where to look for the cause? There is no scheme. Thanks in advance for advice.
angelica / 29.08.2015 - 11:05
phone Panasonic kx-ts1451v goes a solid beep when dialing a number, maybe someone has instructions pliz, E-mail,
andrey / 07/31/2015 - 16:05
You can hear the call on the base but not on the handset.
lyudmila / 07/30/2015 - 21:59
I pick up the phone and the inscription there is no connection, connect the adapter although everything is connected
Michael / 07/07/2015 - 08:36
No ringing call
galya / 04/05/2015 - 18:54
galya / 04/05/2015 - 18:49
Panasonic KX-TG1611CA during a conversation began to beep, it was also audible to the person you were talking to.
Alexander / 03/26/2015 - 07:14
When talking on the phone, I hear my own echo. How to eliminate?
Evgeniya / 24.02.2015 - 12:27
PANASONIC KX-TC1001. When dialing a number, the continuous dial tone does not disappear. There is no connection. My call is excellent. Please help. Thanks.
Dhaka / 29.01.2015 - 11:10
the sound of the call bell disappeared, the screen shows a loudspeaker with a double cross at the exit from the socket, I don’t know how to remove it, tell me who can
Tatiana / 16.08.2014 - 11:00
the base does not respond to the handset. and the antenna flashes on the handset, the time and date have been reset and I can’t set, I’m trying to install, and in response there are two beeps. what could it be?
Vadim / 07/12/2014 - 18:49
No incoming calls (call) Panasonic KX-TCD540RUM. Please help. Thank you
Sergey / 10.05.2014 - 22:27
In general, Panasonic radio telephones are reliable like a tank. (according to a well-known saying) That with a tank is not always true. But the phone has been working for me for more than 11 (or even 12 years - I don’t remember exactly) minor problems arose, of course. I’m so neat. But in my absence, a neighbor looked after the household. I didn’t like the color of my 2511th got dirty from dirty hands in the garden. He regularly plowed on the farm for a couple of years until someone stole it. the only thing that got in the way was low power. Before the neighbor's house, it was not always possible to make reliable contact with the base device. As a “techie”, I found a way to solve the problem. I won’t say how. And the service from the firms is good.
oleg / 25.11.2013 - 11:42
PANASONIC KX-TG720RU They call me normally, but when I try it myself, when dialing, the constant beep does not disappear, it continues to buzz. What kind of breakdown, is it possible to do something, I will be grateful for the answer. mail
tsiganckow.alex / 07.11.2013 – 08:27
I see a lot of questions. Why are there no answers?
galina / 25.10.2013 - 07:21
no call ring when dialing can't get through to us

1 2Forward

You can leave your comment, opinion or question on the above material:

PANASONIC KX-TC408RU-B

Fault: The call only works if the phone is on the base or if any button is pressed during the call.

Remedy: Check the crystals on the pipe processor: for start in standby mode and for frequency. Check the level of the charging signal on the processor, do not solder the processor legs and its strapping. Check the quartz resonator on the processor.

VOYAGER CL-1000

Fault: Call does not work when incoming call either on the base or on the handset.

Elimination: Probably, loss of capacity or leakage of electrolyte, which is in the optocoupler circuit, breakage of the capacitor in the input circuit of the optocoupler from the side of the telephone line. You can increase the capacitance, reduce the resistor in the same circuit. It is convenient to apply a change as a call of the order of 120V through a 1-2 kOm resistor if there is no simulator or a friend on another phone. If the phone rings when dialing on a parallel set, then all actions are reversed.

PANASONIC KX-F90B

Fault: Does not respond to any button, when turned on, it says that everything is in order and starts the answering machine. Signal from telephone network does not accept.

Remedy: Check if one of the buttons is pressed.

PANASONIC KX-TC1025

Remedy: Replace C103 (receiver filter-input IC).

PANASONIC TX-9280

Fault: Weak indicator light, message about a bad battery, although it is fully charged.

Remedy: Defect in diode D1 according to the diagram. Check the presence of a supply voltage of 5.5 volts at the anode, the voltage at the cathode should be 5.2 volts. If the voltage at the cathode is below 4 volts, then the diode must be replaced.

SANYO CLT-55

Problem: The BATT indicator flashes even when the battery is fully charged. LOW

PANASONIC KX-T3611, 3621

Fault: There is no connection between the handset and the base.

Remedy: Check the soldering of the transmitter quartz output in the tube.

PANASONIC KX-T4311

Fault: During normal operation of the handset and base, there is a malfunction in the answering machine.

Remedy: Check the operation of the power supply for increased voltage ripple.

NOVA RX-3610TR

Fault: The call is constantly on the handset.

Remedy: Leak in ringer node optocoupler on base unit.

SANYO CLT-85KM

Fault: In the handset, with charged batteries, the discharge LED blinks.

Remedy: Check processor and piping circuits.

SANYO CLT-75KM

Fault: Reduced range.

Remedy: Check the output transistor in the base.

SANYO CLT-55,65

Fault: Low battery light flashes, no connection, batteries are normal.

Remedy: Check processor and piping circuits.

PANASONIC KX-T9080

Fault: A crackling sound is heard during operation.

Remedy: Bad contact in the connector between the RF unit and the board.

PANASONIC KX-TS408

Fault: The handset does not work, while there is a keyboard poll.

Remedy: Replace D17 zener diode on power IC;

PANASONIC KX-TS900

Fault: Decreased range.

Remedy: Check the 903 MHz filter in the tube.

PANASONIC KX-T9500

Fault: Unstable connection tube-base, base-tube normal.

Remedy: Faulty handset noise detector. Change the filter to 455KHz.

PANASONIC KX-T7980, 9050, 9080, 9280

Fault: There is no connection between the handset and the base due to the drift of the transmitter frequencies.

Remedy: The tuning capacitors in the RF unit are oxidized.

PANASONIC KX-TS408

Fault: Unable to tune transmitter frequency.

Remedy: Replace varicap.

Fault: Dialing does not work.

Remedy: Replace reed switch..
ERICSSON GF788

Fault: When turned on, it does not find a station, a long connection with a subscriber, when the case is squeezed, there is a noticeable improvement.

Remedy: Check the contacts coming from the card chip.

HARVEST HT-4

Fault: Communication interference (in the form of rumble and noise).

Remedy: Check the capacitance in the 4700 microfarad power supply.

Siemens C35

Fault: Received signal level indicator - 1, connection is unstable.

Remedy: Check the socket for connecting an external antenna.

It's been a long time since they've entered our lives. polypropylene pipes. They replaced metal and other plumbing systems. I want to tell how to solder polypropylene pipes yourself.

When I made heating at home, I decided to use polypropylene pipes, they are quite inexpensive and very easy to install. But before doing pipe soldering you need to buy the right tool.

Those who love to travel and visit different countries noticed that sockets and plugs are not the same everywhere. Same when ordering. various devices and devices, for example from China, it is proposed to choose various options: EU Plug, US Plug, UK Plug, AU Plug. How not to be mistaken in this? Let's take a closer look.

Score 4.5 voters: 15

WikiHow is a wiki, which means that many of our articles are written by multiple authors. When creating this article, 14 people worked on editing and improving it, including anonymously.

If your landline phone does not work, then you need to diagnose the problem as soon as possible. You have to find out if one or more phones are not working and look in any device connected to the phone line, from answering machine to fax, to see where the problem really is. See Step 1 below to get started.

Steps

Be specific about your situation:

Is this just one of several phones that don't work? If so, swap your two phones. If the problem is fixed by the phone, then the phone or its cord is faulty. If the problem remains with a particular outlet, the problem is with that outlet or the wires leading to it.
To fix any problem, you must first establish what kind of difficult situation you are in. Are all phones working? None of the phones are working? What do you hear when you call your number from another phone?

Now that you have an idea of the nature of the problem, try partition trouble. There are many places where you can logically separate sections of your telephone service. Consider each of these places and ask yourself which side the trouble is likely to come from.
Consider everything related to your telephone line. Often the problem is in a device that you may not think about, as these devices may be out of sight (out of mind). If all your phones are "dead", disable all of these devices as a first troubleshooting step:
- Answering machine
- Fax
- Computer modem (modem for computer)
- Satellite receiver or cable box Satellite receiver or cable box - these devices sometimes have telephone connections for authorization and pay-per-view).
- Keep in mind that the problem may not be with the phone itself - instead, the problem may be with the phone jack or wiring. If moisture gets into ANY phone jack anywhere in the home, it can corrode connections and eventually short out, which can cause some or all phones to stop working. Bad joints, especially if exposed to moisture, can also cause your phone to stop working.
- line lockout(Line Lock) can confuse you when troubleshooting. When the telephone is left off-hook for more than a couple of minutes, the telephone company's central office automatically switches your line positions to "lockout." This prevents the line from consuming resources, which could result in a denial of service to other clients. Many deficiencies in your telephone wiring or equipment will cause central office equipment to fail. act like this, as if your phone is actually turned off. When this happens, your line goes into "lockout". Troubleshooting means your line might not be free for a few seconds after that how you find and fix the cause of the problem.
- Network Interface Device (NID)- device network interface, also known as Subscriber/Network Interface (SNI)- subscriber/network interface or Point of Demarcation(Demarc Demarcation Point) is the box, often gray and outside the home, where the telephone company's wires start, the lightning rod is installed, and your phone's wiring ends. An important feature of the NID is the test jack with a short telephone cable. Disconnecting this cord disconnects all your internal wiring from the telephone company's network, allowing you to plug a "known-good" phone into the NID to check if the service works with home or work. If so, your "service" is good, but your wiring or device inside is the source of the problem (see line blocking below).
- If the phone will not dial numbers, check that the tone/sound switch is not set to the wrong position (such as halfway between two positions). Note that pulse dialing will not work if you are using some VoIP services, and tone dialing will not work on some phone lines (although this is more rare in the United States).
- If the phone stops working after a thunderstorm, it's possible that lightning struck the phone line and caused a power surge that damaged the phone. The actual hit could have happened several thousand meters away and traveled down the line to your phone.
- If you suspect the phone is broken, try it at a friend's or neighbor's house where you know the phones work. Also, if possible, try swapping out the line and handset cords with known good cords from another working phone. The vast majority of phone problems can be traced to bad cords and/or bad or rusty modular jacks.
- Home and work phone wiring is typically installed using one of these topologies:
  - Star or Home Run - each connector has a wire that "returns" back to the NID.
  - Daisy Chain - wires from NID go from one outlet to another, to another. This can also be called a "ring" topology, except that it is not a valid ring, since the last socket is not looped around and then returned to the NID.
  - Combination of the 2 - you can find a ledge leaning from a point along the chain, or some exits "return" back to the NID while others are part of the Daisy Chain.
- Telephone companies often offer a "wiring service" plan. This plan covers the repair of wiring that meets their standards but has become faulty. More importantly, this plan prevents you from having to pay "unproductive shipping" charges if the technician thinks the problem is in your home. Or, to be more precise, if the technician doesn't find any problems outside of your home (i.e., beep is good for your network interface.) This is essentially extortion of money, but it's better to pay than not to pay: you pay the phone company to be quiet, nice and help you when you have problems. Your reward is not a search guilty.
- If the phone does not ring, check that the ringer volume or the on/off switch is not at the lowest setting or "off". In addition, some very old telephones may have frequency-tuned "harmonic" rings intended for use on party lines and will not work properly on today's private telephone lines due to the difference in ringing frequency.
Warnings
- The working slang term for the tension of a call is "jingle juice" (jingle juice). You only need to touch the wires or internal parts of the ringing phone once in order to understand it. You can get a very annoying, although not usually fatal, electric shock while working on telephone wiring, especially if the phone rings or dials (in the case of a rotary dial/pulse phone) when the wire is touched. The impact will be stronger if you are standing on an uninsulated or wet surface, if you are touching both wires at the same time, or if any other part of your body is touching a grounded metal object such as a pipe, pipeline, freezer, and so on.
- Working on a telephone wire during a thunderstorm can be fatal. Telephone wires go outside. Whether they are above ground or underground, they are still at risk from being hit by lightning. The phone company adds lightning protection devices on the outside, but the main purpose of these devices is to protect their network from indirect lightning strikes (where lightning strikes are nearby but don't actually strike the lines. A direct hit can start fires, your phone or socket will turn black, and you you yourself can die if you hold a phone or work on wires If you need to talk on the phone during a thunderstorm, you must use a cordless phone or loudspeaker - wired phones can carry lightning from the outside all the way to your ear.

Restoring the lock of the battery compartment cover of portable handsets

Rice. 1. Installation of additional parts, as well as the places of their attachment to the cover

Rice. 2. Latch

Checking and repairing antennas of PANASONIC portable cordless phones

Rice. 3(a,b). The device of the antenna and the appearance of which with the cover removed

Another, simpler way to check is by dialing with a multimeter. They check the presence of electrical contact between the lower contact plate of the antenna 4 and the upper end of the helix 5. To do this, open the tube body and try to pull the plug 2 out of the upper part of the antenna cover. If this is not possible, the case can be pierced with a fine needle. If there is no electrical contact, most likely there is a break in the wire of the extension coil in the places indicated in fig. 3b. In this case, the antenna must be disassembled. Then the cover is removed from it, freeing it in the attachment points 1 and 3, prying or cutting the lower edges of the cover. Sometimes a case is possible when the plastic base-mount of the antenna 4, on which the coil is wound and the contacts are installed, is broken. It must be glued, for example, with Super Moment glue. Rewind the coil if necessary. The antenna assembly must be carried out carefully so as not to damage the base and the coil. If there are doubts about the strength of the bonding, you can additionally strengthen the base in the case using the same glue. But it should be borne in mind that in the future repair of the antenna will become difficult. Another way to check the antenna without disassembling it is to connect a temporary antenna to the tube. This can be either a known-good antenna of a similar design, or a home-made helical antenna. It can be made by winding a single-core copper wire with a diameter of 0.3-0.4 mm in PVC insulation on a rod of insulating material with a diameter of 3-5 mm and a length of 100-120 mm. If the reason for the deterioration in the operation of the BSHT is a break in the internal coil of the antenna, with such a replacement, its performance is restored completely or with a slight loss of communication range.

Rice. 4. Homemade spiral antenna

BSHT malfunctions associated with design and manufacturing deficiencies of blocks and components

Cordless phones from PANASONIC can be conditionally divided into several generations by series, each of which is a modified version of the previous series. That is, despite the different functionality of the models, provided by control units, indications and various additional digital storage devices, we can talk about their serial versatility, according to the operating range of 40 or 900 MHz. This provides high potential reliability and durability, not only due to good performance, but also due to high maintainability. In practice, this potential can be realized only under the condition of careful operation, timely qualified maintenance and repair.

It should be noted that in addition to general issues and precautions during repairs, there are also specific malfunctions characteristic of certain models, the various manifestations of which can mislead radio mechanics, forcing them to spend extra time searching for and eliminating them. In this case, erroneous actions are not excluded. In fact, these malfunctions are the result of shortcomings made by the manufacturer in the production of a particular model, and sometimes even the result of its design flaws. Often they appear some time after the start of operation under the influence of adverse external factors. Here, for example, is one of the typical schemes for such an impact, leading to frequent failures of cordless telephone handsets. As a result of the ingress of various liquids under the keyboard, the contact pads become dirty, the quality of the contact deteriorates, or vice versa, they close. When pressing the keys, the user is forced to apply more and more effort. As a result of deflection of the board, the conductors break under a special contact layer, or contact is broken at the soldering points of the elements. Moreover, breaks can be temporary, which makes it difficult to check with an ohmmeter, leading to an erroneous conclusion about a microprocessor malfunction.

This often happens with tubes of models KX-TS155V, KX-TS157V and close to them in terms of design. For example, in many PANASONIC handsets, as a result of strong pressure on the bottom buttons of the keyboard, the conductor under the contact layer of the FLASH button often breaks. As a result, in addition to this button, the keys 1, 2 and 3 do not work either. Sometimes this happens in other models with different contact pads and jumpers applied in the same layer on the typesetting field of the boards. Attempts to restore contact by stripping this layer and soldering, etc. have no success. As practice has shown, in these cases, the most reliable method of repair is to restore the necessary connection from the back of the board. In this case (for models KX-TS1558 and KX-TS1578V), pin. 8 of the microprocessor (CPU) must be connected to the anode of the diode D34 or to a conductive pad on the board, as shown in fig. 5. For this, it is better to use a piece of PEV-2 wire with a diameter of 0.12-0.15 mm.

The resistance of the windings of these heads is from 110 to 150 ohms. A significant part of the problems that arise during operation are associated with them. Firstly, the winding of the moving coil of the heads is made with a thin wire, which often breaks. In this case, it becomes necessary to choose a replacement head, since it is difficult to purchase the original. Suitable in terms of resistance is the DEMSh-1a capsule of domestic production. To install it in the tube, the capsule must be removed from the plastic housing. Then, the capsule leads are carefully soldered from the clamp contacts and extended with PEV-2 wires with a diameter of 0.15 mm. The metal case of the capsule around the perimeter is wrapped with electrical tape or tape. The wires are laid by gluing them with glue on the sides over the electrical tape. Install the capsule in the center of the tube head socket. So that it does not hang out, the free space between the walls of the nest and the primer is filled with a strip of foam rubber rolled into a ring, which is also fixed with glue. In this way, several pipes of various models were restored. The sound quality was rated as good by users.

Rice. 6. Coil inside head

Several heads were restored after soldering the contacts on the pads at the junction of the windings and external leads. Some of the heads had normal resistance, but we reproduce sound with distortion or the sound was quiet. As it turned out, the reason for this is the jamming of the coil in the magnetic gap. Although the openings in the cover on the diffuser side are very small in diameter, moisture (or traces of it) was found in some heads, as well as metal filings. Probably, in order to prevent this, later manufacturers began to supply the heads with a special protective film, similar in structure to paper. As a result, pipes began to come in for repairs even more often. And this happens, probably, for the following reason. After some time during operation, there is a gradual or sharp decrease in the volume of the sound in the handset. The reason for this is that the specified protective film, exposed to moisture, reduces its sound transmission, which leads to overload and failure of the scarce head. To avoid this, it is necessary to remove the pasted film by removing the head from the nest with a scalpel or other sharp object. Instead, a protective pad made of thin sound-permeable fabric is installed. No adjustments are required, the volume and sound quality are even higher than at the beginning of operation. Literature

Literature

Petrov I.A. PANASONIC radiotelephones. Device and repair. M., 2003, MRB, issue 1259.

A source

Magazine "Repair & Service"

Publication date: 21.04.2005

Readers' opinions

Alla / 08.08.2016 - 09:38
hello! I also have this problem: the phone is charging, but there is no connection, there are no sticks, what could it be [email protected]? write who knows the answer! thanks!
ANDREY / 02.05.2016 - 21:35
Panasonic KX-TGA820RU when dialing a number, there is a long beep, tell me the possibility of correcting it at home 8916 375 6970
Hope / 03.01.2016 - 20:04
After charging, when you remove the handset from the base, the light on the handset is on.
Hope / 03.01.2016 - 20:02
I have a light bulb on the handset after charging. What it is?
Victor / 06.10.2015 - 23:00
Panfsonik KX-TGA110UA radiotelephone - after charging, the indicator on the display shows that the battery is low (although when checking it turns out that it is fully charged) and when you turn on the phone, it immediately turns off. Tell me where to look for the cause? There is no scheme. Thanks in advance for advice.
angelica / 29.08.2015 - 11:05
phone Panasonic kx-ts1451v goes a solid beep when dialing a number, maybe someone has instructions pliz, E-mail, [email protected]
andrey / 31.07.2015 - 16:05
You can hear the call on the base but not on the handset.
lyudmila / 07/30/2015 - 21:59
I pick up the phone and the inscription there is no connection, connect the adapter although everything is connected
Mikhail / 07/07/2015 - 08:36
No ringing call
galya / 04/05/2015 - 18:54
galya / 04/05/2015 - 18:49
Panasonic KX-TG1611CA during a conversation began to beep, it was also audible to the person you were talking to.
Alexander / 03/26/2015 - 07:14
When talking on the phone, I hear my own echo. How to eliminate?
Evgenia / 24.02.2015 - 12:27
PANASONIC KX-TC1001. When dialing a number, the continuous dial tone does not disappear. There is no connection. My call is excellent. Please help. [email protected] Thanks.
Dhaka / 29.01.2015 - 11:10
the sound of the call bell disappeared, the screen shows a loudspeaker with a double cross at the exit from the socket, I don’t know how to remove it, tell me who can
Tatiana / 16.08.2014 - 11:00
the base does not respond to the handset. and the antenna flashes on the handset, the time and date have been reset and I can’t set, I’m trying to install, and in response there are two beeps. what could it be?
Vadim / 12.07.2014 - 18:49
No incoming calls (call) Panasonic KX-TCD540RUM. Please help. Thank you [email protected]
Sergey / 10.05.2014 - 22:27
In general, \"Panasonik\" radiotelephones are reliable like a tank. (according to a well-known saying) That with a tank is not always true. But the phone has been working for me for more than 11 (or even 12 years - I don’t remember exactly) minor problems arose, of course .I thought I was so neat. But in my absence, a neighbor looked after the household. I didn’t like the color of my 2511th got dirty from dirty hands in the garden. case colors. He regularly plowed on the farm for a couple of years until someone stole it ... the only thing that interfered was low power. Before the neighbor's house, reliable contact with the basic device was not always possible. I'm like\"techie \" found a way to solve the problem. I won't tell you. And the service from the firms is good.
oleg / 25.11.2013 - 11:42
PANASONIC KX-TG720RU They call me normally, but when I try it myself, when dialing, the constant beep does not disappear, it continues to buzz. What kind of breakdown, is it possible to do something, I will be grateful for the answer. mail [email protected]
tsiganckow.alex / 07.11.2013 - 08:27
I see a lot of questions. Why are there no answers?
galina / 25.10.2013 - 07:21
no call ring when dialing can't get through to us

So, let's begin!

Panasonic digital wireless telephone answering machine. Manufacturer: Kyushu Matsushita Electric. But the handset can be of any manufacturer. All such handsets have a similar device. And the cause of the malfunction in this case can be the same for everyone - there is no contact between the rubber contacts of the keys and the contacts on the phone board.

We unscrew the fixing screws on the case of the back cover. In this model, they are located under the cover of the compartment that covers the AA batteries.