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  1. dorke

    Power amp fan trouble

    From the schematics Martin posted: The Temperature sensor is IC5 at location A-6(bottom left of page) of the "output module", type is LM35DT . It is a TO-220 type and thus looks like a power transistor :) look for it on the heat-sink probably with thermal grease. Here is it's datasheet...
  2. dorke

    Siemens waching machine Siwamat plus 7421 repair-need schematics

    I opened the machine side,the model is a top loader . photos are a bit of a problem for me now. I disconnected and removed the control board (4 connectors) . There is no visual damage in the machine:belt is fine. Looks like the mains lamp is neon. it lights up without the control board in the...
  3. dorke

    Siemens waching machine Siwamat plus 7421 repair-need schematics

    Washing machine is not working at all only line lamp is on. before it was tripping the current fuse (not residual!) after a few seconds with a loud boom coming out of it . Now that I opened it not tripping anymore just doesn't work at all. Any ideas? Anyone has service manual or schematics...
  4. dorke

    Yahama RX-v450 fault off BD3816K1 IC ?

    I have the full S.M,It is too big to upload. Here is the section I described above in words. I think IC301 is shorted inside ,as it warms up quite a lot. Anyone has seen does chips fail that way?
  5. dorke

    Yahama RX-v450 fault off BD3816K1 IC ?

    Has anyone witness such an IC go bad? It is getting quite hot to touch (IC301). The problem started as a protection of PS error. I traced it down to the -12V regulator being overloaded . next I found a shorted PNP transistor Q308 (C-E)on the -7V regulator (2SA1015 on the schematics,but on the...
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