Dicas Reparação SONY
Modelo - Chassis
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| Marca | Modelo (Chassis) | Sintoma | Causa | Solução | Por: |
|---|---|---|---|---|---|
| Sony | TAN8550 | MISSING CONNECTION | DC balance circuit in class A amp board does not function.Due to missing plating in ground line circuit. This in turn supplies DCvoltage on 0 volt line which in turn causes VFET failure. Also I feelthat if the value of RT701 22 kohm DC bias adjustment | ||
| Sony | TAF5A | THERMAL FUSE IN TRANSFORMER | Primary of T503 was found defective. Upon removal andinspection, a thermal fuse was found in series with Pin 1. There was nosign of heat anywhere in the PPS. Jumping the fuse restored operation -a new transformer was ordered. | ||
| Sony | TAF5A | DEFECTIVE D363 | Unit came into FSC with burned R360 and leaky Q352. Staticcheck of other components showed no gross shorts or opens. | ||
| Sony | TAF3A | TRANSISTORS SHORTING TO HEAT SINK | After the output transistors have been replaced, and unit hasplayed, the outputs will go out again. | ||
| Sony | TA4650 | DC BALANCE | DC balance on the speaker outputs is determined by matchingof Q302 and Q303. | ||
| Sony | TA2650 | REPLACEMENT TRANSISTORS ARE IMPROVED | Customer complained of noise with volume control at midposition, standard input levels. | ||
| Sony | TA2650 | SWITCH OUT OF PROPER LOCATION | No audio output on any function - function switch (S1) wafers180 degrees out. | ||
| Sony | STRV55 | LEAD DRESSING NEEDED | Whining noise from processor with no FM signal and muting off. | ||
| Sony | STRV55 | WIRE NUMBERS ARE REVERSED | Incorrect wire number. Numbers #1 and #3 reversed. | ||
| Sony | STRV35 | DEFECTIVE OUTPUTS | The NPN output transistor opened on one channel of each ofthese receivers. No other problems found. | ||
| Sony | STRV2 | P/N FOR GLASS | Cases of concealed damage to front glass on these models havebeen reported. Present solution is to replace entire front panel assemblybut it is costly. -HQ COMMENTS: A similar situation developed on the STR-4800SD, -5800SD,-6800SD models 3 years ago. | ||
| Sony | STR7065 | PROTECTION TRANSISTORS REVERSED | Burned main amplifier board was replaced (X-482-232-50).Amplifier clipped at 1 watt out. | ||
| Sony | STR212 | DEFECTIVE IC20, 301, Q301, 302 | No AM or FM - IC201 voltages incorrect, Q301 collector read 11volts. Replacement of individual IC, would knock the other chip out. | ||
| Sony | STC7000 | ADJUSTMENT NEEDED | The maximum deflection on tuner input meter did not correspondto center channel on tuning meter. Adjustment of FM discriminator and FMIF was unsuccessful. | ||
| Sony | SQA2030 | DEFECTIVE Q701 | Noise in back channel outputs. -HQ COMMENTS: Replaced regulator transistor Q701, 2SC1124. |