Dicas Reparação SONY
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| Marca | Modelo (Chassis) | Sintoma | Causa | Solução | Por: |
|---|---|---|---|---|---|
| Sony | ICF7750 | OPEN FOIL TRACE | Sound was very low and distorted or there was no sound atall. We found an open foil associated with R41. The foil looked finebut was open. Foil repair resolved the problem. Although this appearsto be a straight forward repair, it STUMPED the technici | ||
| Sony | CRF320 | BAD CONTACT ON SS-6 SWITCH | The unit came in with very poor sensitivity in AM, SW and LW.Checked and found there was almost no local oscillator signal at thecenter tap of IFT201 in the second mixer circuit. | ||
| Sony | CDP501ES | MISSING GROUND PATH | At the end of each selection of music unit would go intoPAUSE, no matter what position switch S917 was in AUTO/PAUSE. | ||
| Sony | XR75B | JAMMED TAPE | Tape jams or unit will not take up tape. Problem is withPart #318 on P51 S/M. Roller bearing on right side of tray is bent andloading mechanism cannot move smoothly. | ||
| Sony | WMF10 | NO FM | FM was not working. Only white noise was heard. Since therewas FM white noise, I suspected RF section was bad. | ||
| Sony | WMF10 | ERRATIC SPEED | The problem has been traced to poor solder connections onR904 and TH901. Often these two components have been installed offcenter. Resolding resolves the problem in about 50 percent of the cases.The balance of the units require replacement of R904/TH90 | ||
| Sony | WMD6C | NO SPEED CONTROL | The motor turned at maximum speed regardless of the functionor speed control. I replaced IC601 and FG901 but they did not help. | ||
| Sony | WMD6 | PAUSE DOES NOT WORK | All functions worked correctly except PAUSE. We found piece#387 not engaging #396. It appears that this was shipped from the factoryin this condition. There is no way for this to dislodge easily. -HQ COMMENTS: I checked using the tape transport which | ||
| Sony | TCM5000 | STATIC IN AUDIO | This unit produced an intermittent pop/static in the audio.We found the capstan bearing to blame. I have noticed that this unit isespecially prone to static problems caused by poor grounds. | ||
| Sony | TCV7 | MALFUNCTIONING AMS MODE | This unit would engage when the AMS function was activated butwould not stop at the next selection. We found IC707 to be defective.Pin 10 would not change states. | ||
| Sony | TCK777 | POOR FREQUENCY RESPONSE | Poor high frequency response on recording. | ||
| Sony | TCFX505R | MALFUNCTIONING AMS MODE | No music scan or FWD AMS operation. Found that head chassiswas not staying up in AMS position, thus the RP head was not reading anyaudio off the tape. | ||
| Sony | TAF555ES | TRANSISTOR SUBSTITUTIONS | Power amplifier uses many 2SC1815-Y transistors in the firststages. Parts list subs them with 2SC1364. I believe this is incorrect,since for instance Q309 and Q310 would need a Vceo greater than 60V. Myspec list shows a typical Vceo for a 2SC1364 of 5 | ||
| Sony | STP7J | MALFUNCTIONING MEMORY CHIP | This unit worked fine except it was not possible to enter astation into memory. All inputs to the memory appeared to be correct.Replacing IC601 (CX761) resolved the problem. | ||
| Sony | ICF2001 | MALFUNCTIONING AGC CIRCUIT | In FM mode, if there is a large bass sound, it is verydistorted. But if the RF carrier level is low, the bass sound is notdistorted. |