STRV5 Repair Tips




Search: STRV5
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MakeModel Ch.SymptomProblem SolutionSolutionBy:
SonySTRV55
POWER SUPPLY CIRCUIT DIFFERENT Power supply circuit different. This is multi voltage 110/120/220/240 unit. Could we possibly get a copy of schematic and boardlayout? -HQ COMMENTS: KCP will send you a copy of overseas unit circuit.
SonySTRV55
HUM IN BOTH CHANNELS LOW VOLUME IN LEFT The unit had a hum in both channels that would disappear assoon as a scope probe ground connection was made. Also there was lowvolume on the left channel - all modes. We found the problem to becaused by crystaline growth on IC601 and C603. We cleaned
SonySTRV55
NO TUNER OR MEMORY No tuner output or memory functions. Tuning voltage to tunerremained at 30V regardless of frequency indication on display.External DC on tuning line resulted in good reception. DC on IC402were wrong for Pins 2, 3, 8 and 14, 15. Replacing IC401, IC402,
SonySTRV55
LEAKY C101 Only white noise was heard in FM mode. PLL tuning voltage(2.8-20V) did not change at all.
SonySTRV5
DEFECTIVE IC451 No output, meter and lights operating, relay activates. B+and B- low.
SonySTRV55
LEAKY C412 AM and FM very slow to lock on station - then drifts offagain. Tantalum capacitor C412 in LPF was leaky.
SonySTRV55
LEAD DRESSING NEEDED Whining noise from processor with no FM signal and muting off.
SonySTRV55
WIRE NUMBERS ARE REVERSED Incorrect wire number. Numbers #1 and #3 reversed.
SonySTRV55
DEFECTIVE CAPACITOR Interstation noise on AM and FM. Receiver will not scan orselect stations via memory presets. All segments of display tube lit up.
SonySTRV55
COLD SOLDER CONNECTION Protection circuit relay, RY701 would actuate intermittentlywhen volume was turned up from about 3 click-stop positions to the 9o'clock position.