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TYPICAL FAULTS OF VARIOUS HOUSEHOLD APPLIANCES
1). Repair of the membrane keypad in microwave ovens. I decided to share with society how to repair the membrane keyboard in microwave ovens. |
2). Polyspan ViewStation; SPU41-13-2 (Power supply from videoconference) The power supply is not fully operational, there are no output voltages + 5V and + 12V. The clicks are heard, the LED is off. Diode D23 is defective P6KF180A. The resistor connected in series to the capacitor C23 is burned. |
3). EIMO-450Afpal is a document camera. When you turn on, you hear a soft snap. At the same time, the LEDs D809 (B & W) and D810 (Auto) flash simultaneously. The appliance does not turn on. When measuring the output voltage of the PSU (it should be + 12V), it can be established that in time with the cod, the output voltage rises from 0 to + 3.8V. Defective power supply - capacitor C9 is defective 4.7μF / 50V (lost capacity). It is easy to determine the thermal effect. |
4). HUNTRON HTR1005B-1ES. Measuring device. Signal analyzer. 1) The displayed waveforms are not correct. After trying to measure a heavily charged capacitor, the device failed. The device does not have input voltage protection. Very often two resistors R5 (215 Ohm) and R6 (13 Ohm) burn. Maxim [email protected] |
5). POWER SUPPLY. An interesting malfunction of the computer power supply unit is the ATX. Almost like in a joke "does not execute the command NO SMOKE", that is, the smoke from it goes. Smoke comes from the capacitors of secondary rectifiers, after the unit is started from standby mode. All output voltages are overestimated by about 2 times. However, there was no voltage at the output contacts on the + 5V circuit. Stabilization of output voltages is carried out just by the analysis of this particular circuit, and for this reason the block went "peddling". And the defect turned out to be a factory fault - the inductor, at the very end of the 5V circuit, is simply inserted into the board, and not propyanjana: Good luck to all! Korzhov Oleg [email protected] |
6). AON to Z80 version 23. The digital part works fine. The call to the station is not heard in the handset, although the conversation is normal. However, there is no feedback. The conversation part in this phone is assembled according to the phone scheme of TA-1158. The reason was in the broken transistor KT3102B (microphone amplifier). |
7). Kettle - with automatic shutdown (of any company). Frequent malfunction: the kettle shuts down prematurely and the water does not boil. Do not climb the switch! The fault is eliminated by simply removing the scale in the place where the foam contacts the heel of the attachment. This place should be completely descaled (can be removed mechanically). After this procedure, you need to fill in 0.5 liters of water, fill it with a bag of citric acid and, without closing the kettle, bring it to a boil (boil 5-10 minutes). If there was a lot of scale, then this procedure will have to be repeated several times. After such cleaning, the kettle looks like new and works perfectly. |
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