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| Marca | Modelo (Chassis) | Sintoma | Causa | Solução | Por: |
|---|---|---|---|---|---|
| Sony | TAM30 | UNIT LOCKS UP | When applying power to the unit without a tape in the deck,unit does a quick reset and gives an error detection signal. This was anindication that the micro was trying to perform a mechanical function.Scan pulses were found on IC-3 pin 58 telling the mi | ||
| Sony | ITA305 | LOW HUM IN UNIT | Unit had low hum when trying to break the dial tone and therewas also no OGM. This was the result of the power supply voltage beingpulled down to 8.5 volts. IC-606 was internally leaking to ground. VCCto ground was approximately 2K Ohms. Also credit | ||
| Sony | TAM30 | INTERMITTENT LINE CONNECT | With the line cord plugged in, unit will grab the line in 60seconds (with audible dial tone) and then release the line in 60 seconds.This is a continuous cycle. This is caused by C-1 leaking which activatesPH-1 and grounds pin 4. This in turn holds IC- | ||
| Sony | TAM30 | ACTS LIKE NO POWER AFTER KEY IS PRESSED | With line cord and power cord plugged in, the unit acts likethere is no power while performing OGM function. With line cord removed,OGM function can be performed. The cause was C-1 being leaky, which turn-ed on PH-1 and lowered pin 4 to ground holding | ||
| Sony | ITA205 | INSTANT HANGUP | When unit answered the ring, it would grab the line momentar-ily and release it. IC-401 pin 19 was not supplying the .7 volts to thebase of Q-106, which is necessary to operate the O.G.M. interupt detectcircuit. This in turn would not allow PH-604 to a | ||
| Sony | ITA305 | NO ANSWER | Unit will not answer the ring signal. C-601 is missing fromthe PCB. | ||
| Sony | SPP50 | NO SIDE TONE | No side tone but handset does receive dial tone. The problemwas isolated in the base. Defective C-71 was preventing side tone fromreturning to the handset. The capacitor was dried out which allowed theouter can to spin freely. Also pertains to serial | ||
| Sony | ITA305 | UNIT ANSWERS RING SIGNAL AND IMMEDIATELY DROPS LINE | When unit answered the ring, it would grab the line momentar-ily and release it. IC-401 pin 19 was supplying the .7 volts necessary tooperate the OGM interupt detect circuit and pin 2 of PM 604, but pin 1 ofPH-604 was not being supplied with its needed | ||
| Sony | SPP170 | NO TALK | Base will not receive because defective D-302 is pulling downpin 14 (IC-302) which is the charge pump output for the receive section. | ||
| Sony | HSTV102 | NO AUDIO FROM "B" DECK | The audio from the B deck was being muted. The voltages onIC-501 and IC-502 were incorrect. | ||
| Sony | TCRX420 | MISSING PART NUMBER FOR PLAY INDICATOR LED'S | No part number for LED light indicator lenses (3) locatedabove the play buttons. The parts described above are not referenced inthe exploded view on page 16 of the S/M. The LED's for the play buttonindicators are references D503, D504 and D505. The fr | ||
| Sony | HSTV102 | INTERMITTENT LEFT CHANNEL | No left channel or intermittent left channel in all inputs,tape and tuner. Found that when CN-601 and associated wires were movedleft channel was restored. Also credit Robert Findlay with this report. | ||
| Sony | CCDV801 | ERROR IN SERVICE MANUAL PAGE 137 | On page 137 of the service manual it shows IC-910/pin 1 goingto both ground and 4.8V VDD through a 0 Ohm resistor. Obviously, B+ andground are not connected together. | ||
| Sony | KPR41DS2 | VCR CADDY P/N NEEDED, 4-386-320-01, SEE S/B TVP0110 | I need the part number for the VCR caddy for the above model.This accessory was included with the unit but I cannot find a part numberor an accessory number in the manual. I have a customer who needs onebecause they moved and it was lost. -HQ COMMENTS: | ||
| Sony | CCDV5000 | NO AUDIO - ONE OR BOTH CHANNELS | No audio output on left channel. Traced to no output but goodinput to audio output selector IC-317. Found C-382 had one lead pulledout of can. Noticed that all four capacitors along side of IC-317 werenot flush mounted to board. |