The new type 5300A AV power amplifier silent fault repair method |
| Time£º2015-06-15 08:19:04 Source£ºNetwork Author£ºUnknown Clicks£º1532 |
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Zzqservice manual download site
The power supply point ordinarilythis output voltage should be measured, but zero volts, see double labeled 31 volt transformer, transformer output voltage is 30 volts dual voltage output rectifier, but after it was +18 and -56 V, with ET521 capacitance measuring deflection of filter capacitor is normal, rectifier bridge measurement is also good the change, rectifier voltage is the voltage on both sides of the boot +-33 volts, but all of a sudden +33 and slowly down to 18 volts, and -33 up to -56 volts. Then the output voltage of the transformer side is 31 volts and 29 volts. The amount of vacant and double voltage 30 volt transformer, suspected a problem, if the secondary a slight short circuit will do that, measured by the wave gear ring wave it in ET521, found that the waveforms of different heights, transformer waveform are very good balance, can determine whether the transformer is broken, replace the transformer power machine troubleshooting.Zzqservice manual download site
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