Dicas Reparação
Modelo - Chassis AVU270
Pesquisa: AVU270 Enviar Dica Resolvida
Resultados 12
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| Marca | Modelo (Chassis) | Sintoma | Causa | Solução | Por: |
|---|---|---|---|---|---|
| Sony | AVU270 | NO REAR CHANNEL - RESOLDERED PCB | Found ring crack on rear output. | ||
| Sony | AVU270 | UNIT INOPERATIVE - D901 FAULTY P/N 8-719-107-94 | After replacing the AC relay power switch xistors Q813 anddriver Q812, the new Q813 is inoperative again after turning it on. Ifound D901 was bad (spark killer diode on RY 901- AC relay). Note: theschematic is incorrect at numerous places for instance- | ||
| Sony | AVU270 | IMPROPER SHAPE ON PRE-PANEL ASSEMBLY (REF. 51) | Problem is where surround sound button assembly fits. Bottomof the screw hole has two (2) plastic pins sticking up adjacent to it.The inside pin (closest to the bottom button) must be removed, as well asa portion of the plastic immediately underneath. | ||
| Sony | AVU270 | AC SWITCHED OUTLET NOT WORKING | Q-814 and Q-815 of relay drive is bad. Q-815 would keepopening up. Found D-902 on power relay board shorted. Part number forD-901 and D-902 not listed in service manual. | ||
| Sony | AVU270 | NO TV FUNCTION, NO TV CHANNEL DISPLAY | Indicator lights when TV button is depressed, however, TVchannel indicator is not lit and unit will not accept any TV commands. Novideo out at TV monitor position. All other functions working normally. | ||
| Sony | AVU270 | UNIT WOULD NOT RETAIN MEMORY | Unit would not maintain memory. Schematic shows C503 on anodeside of D519 - not correct - C503 is on cathode of D519. Found also an-other 10uF in parallel which was factory installed. Both caps had de-creased in value. | ||
| Sony | AVU270 | UNIT STAYS IN STAND-BY | Unit will not power up. | ||
| Sony | AVU270 | SURROUND SOUND LEVEL LOW ON TV ONLY | Only saw a noticeable level change when unit on TV surround.All other functions of surround sound good. | ||
| Sony | AVU270 | NO TV OR VIDEO | Unit had no TV or AUX video. | ||
| Sony | AVU270 | NO FM | Complaint of no FM, all other functions OK. Found no supplyvoltage at FM RF amp. Trouble was traced to excess lead length of L303which was touching the ground next to it. | ||
| Sony | AVU270 | NO LOW STATIONS | The unit operated correctly except that it was not possible totune in the low stations. Eg. FM/below 94MHZ, AM/below 1020KHZ and TV/below #5. | ||
| Sony | AVU270 | B+ AND POWER RY ARE REVERSED ON SCHEMATIC | Two lines on the outlet board labeled B+ and Power RY(audio schematic, section G-11) are reversed with respect to each other.+12 volts should be connected to the cathodes of D901, D902 and PowerRY control connects to the anode of D901. -HQ COMMENTS: Thi |