Secrets repair cordless phones

PANASONIC KX-TC408RU-B

malfunction: call work, only if the phone is based on, or if during the call, press any button.

elimination: Check quartz pipes processor: to run in standby mode and the frequency of. Check charging signal processor, nepropai legs of the processor and its binding. Check quartz resonator processor.

TRAVEL CL-1000

malfunction:.The call does not work when an incoming call is not based, not on the tube.

elimination: probably, loss of capacity or electrolyte leakage, which stands in the optocoupler circuit, open capacitor of the optocoupler in the input circuit from the telephone line side. Can increase capacity, reduce the resistor in the same circuit. It is convenient to apply a change as a call of the order of 120V through a resistor 1-2 kOm if there is no simulator or friend on another phone. If the phone rings when dialing on a parallel device, then all actions are vice versa.

PANASONIC KX-F90B

malfunction: Does not respond to any button, when turned on, writes, that everything is in order and starts the answering machine. The signal from the telephone network does not accept.

elimination: Verify, is one of the buttons pressed.

PANASONIC KX-TC1025

malfunction: Range reduced.

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

PANASONIC TX-9280

malfunction: Weak indicator light, bad battery message, although it is fully charged.

elimination: Defect in diodes D1 according to the scheme. Check for anode voltage 5,5 volt, the cathode voltage must be 5,2 volt. If the cathode voltage is lower 4 volt, then the diode must be replaced.

SANYO CLT-55

malfunction: Even with a fully charged battery, the BATT indicator flashes. LOW

elimination: Check processor and strapping.

PANASONIC KX-T3611, 3621

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

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

PANASONIC KX-T4311

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

elimination: Check power supply operation for increased voltage ripple.

NOVA RX-3610ТР

malfunction: The call is constantly going on.

elimination: Leak in optocoupler of the call unit on the base unit.

SANYO CLT-85KM

malfunction: In the tube, with charged batteries, the discharge LED blinks.

elimination: Check processor and strapping.

SANYO CLT-75KM

malfunction: Range reduction.

elimination: Check the output transistor in the base.

SANYO CLT-55,65

malfunction: Battery low indicator flashes, no connection, batteries are normal.

elimination: Check processor and strapping.

PANASONIC KX-T9080

malfunction: Cracking is heard during operation.

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

PANASONIC KH-TS408

malfunction: The handset does not work, there is a keyboard survey .

elimination: Replace the Zener diode D17 on the power supply chip.;

PANASONIC KH-TS900

malfunction: Range reduced.

elimination: Check the filter at 903 MHz in the tube.

PANASONIC KH-T9500

malfunction: Unstable tube-base connection, base tube is normal.

elimination: The noise detector in the handset is faulty. Replace filter at 455KHz.

PANASONIC KH-T7980, 9050, 9080, 9280

malfunction: No handset-base communication due to transmitter frequency drift.

elimination: Trimmer capacitors in the RF unit are oxidized.

PANASONIC KH-TS408

malfunction: Cannot tune transmitter frequency.

elimination: Replace varicap.

IF NO
malfunction: Dialing does not work.

elimination: Replace the reed switch..

ERICSSON GF788

malfunction: When turned on, does not find the station, long connection with the subscriber, while squeezing the housing a noticeable improvement.

elimination: Check contacts coming from the chip card.

HARVEST HT-4

malfunction: Connection interference (in the form of rumble and noise).

elimination: Check capacity in power supply 4700 IFF.

SIEMENS C35

malfunction: Signal Strength Indicator – 1, unstable communication.

elimination: Check external antenna socket.

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