Dicas Reparação HITACHI
Modelo - Chassis
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| Marca | Modelo (Chassis) | Sintoma | Causa | Solução | Por: |
|---|---|---|---|---|---|
| Hitachi | G7PII | St/by only | C906 4µ7 250v, ZD903 130v zener s/c & R909 39k as a precaution | ||
| Hitachi | G7PII | slow start up | R909/2/3 all ok but C906 4µ7 250v hi esr & C905 100µ 160v | ||
| Hitachi | G7PII | No start up - comes on briefly then trips | R909 39k hi res | ||
| Hitachi | G7PII | No start up | Pin 9 IC901 low at 5v (9v) - C914 10µ 50v faulty | ||
| Hitachi | G7PII | int start up | start up volts pin 9 IC901 only 2v - check/replace resistor chain R939,940,941,942,902,903 & C914 2µ2 | ||
| Hitachi | G7PII | Int off | R919/920 100k also check R932 150k | ||
| Hitachi | G7PII | int field collapse | 9v supply to field chip drops to zero, IC703 MC7809 faulty or dy jointed | ||
| Hitachi | G7PII | field collapse | R719 2R2 safety res o/c - no other fault found | ||
| Hitachi | G7PII | dead - gives a rush of noise thr' spkr initially | C914 10µ 50v, C910 33µ 10v, C929 1µ 50v, C915 100µ 10v, C917 4µ7 50v all 105 deg | ||
| Hitachi | G7PII | dead | 82k start up resistors o/c & hi res | ||
| Hitachi | G7PII | dead | ZD903 130v zener s/c; replace R909 39k, R912 47k, R902/3 82k, C906 4µ7, Q905 BF423 | ||
| Hitachi | G7PII | Dead | R931 150k o/c; IC901 internal s/c; 2 diodes on print side s/c (between chassis & Q901 base) - 1N4148 & 6v2 zener; BUT11AF o/c base | ||
| Hitachi | G7PII | Dead | C919 4n7 1kv had split - replacement was 2n2 | ||
| Hitachi | G7P2 | WONT START | CHECK - R931 ( 150K ) , R932 ( 120K ) , R919 AND R920 ( 100K ) CONNECTED IN PAIRS TO TDA4601 | ||
| Hitachi | G7P MkII CPT2508 | Pic pulls to right when heated | Q905 connection to pcb suspect - resolder |