Dicas Reparação HITACHI
Modelo - Chassis
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| Marca | Modelo (Chassis) | Sintoma | Causa | Solução | Por: |
|---|---|---|---|---|---|
| Hitachi | C2874TN | Field o/p chip IC601 LA7838 fails | Check dry joints Q601/2/3 & R610 etc. Check IC751 (e/w corr) in psu | ||
| Hitachi | C2874TN | Field collapse - IC601 failed | Check dry joints Q601/2/3 & R610. Also E-W chip & 10R safety res not marked on cct connected between L752 & diodes D707/6 | ||
| Hitachi | C2874TN | Dead with popping sound from spkrs | R901 82k o/c | ||
| Hitachi | C2874TN | Dead with plopping sound at sw on | R901 82k 1/2w start up res o/c | ||
| Hitachi | C2874TH | Rolling pic when warm | FOP stage supply 4v high at 29v. R952 68k in HT sampling circuit hi res | ||
| Hitachi | C2864TNZ | Slow or no start up | C909 470µ 25v | ||
| Hitachi | C2864TNX | Dead aft EHT rustle & led single blink at sw on | HT checked on dummy load at 170v (149v). Int set HT pot VR930; R509 1R 1/2w safety res by LOPTx o/c; IC800 RGB o/p chip & C821 4µ7 250v faulty also. | ||
| Hitachi | C2864TN | Slow tripping/partial field coll/blank raster/no sound | R609 1R fusible o/c - also replaced TDA8178 Field o/p IC as a precaution | ||
| Hitachi | C2864TN | Electronic screwdriver set up | Hold the vol + and - buttons and switch on. The set will come up with Factory 05 on screen. On the handset press the two rec keys twice(linked by white line) The set will display the tube menu. The top coloured adjustments correspond to the top coloured keys on the handset , the bottom coloured adjustments correspond to the bottom coloured keys. Push the coloured key on the hand set corresponding to the adjustment, ie VA for vertical Amplitude. VA will be high lit. Now pressing the Vol+ or - on the handset will adjust the value. To store the settings , press diamond shaped key (store) and put set into standby to exit service mode. You do not need to store each adjustment, you can adjust them all and store them once at the end. It is a good idea to jot down all the numerical values for all the adjustments first, so if you make a mess you can put the adjustments back to their original settings. | ||
| Hitachi | C2862TN | NO EW AND LOW WIDTH | CH09 150nF OC | ||
| Hitachi | C2858TN | Int dead between 1 & 3 secs | Replace VR941 2k2, R941 100k, and set HT to 157v | ||
| Hitachi | C2858TN | dead int for a few secs at a time | VR941 2k2, R941 100k - adj HT to 157v | ||
| Hitachi | C2858TN | Dead & tripping | C932 1000µ 16v, C933 2200µ 16v low cap | ||
| Hitachi | C2856/2886 | HT setting | 152v | ||
| Hitachi | C2848TN | Txt has low contrast | Poor freq response on Txt - change C805-6&7 to 470pF, check R203 is 2k2 & R204 is 560R - R204 can be changed to 680R as a last resort |