Service manuals, schematics, eproms for electrical technicians


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If you get stuck in repairing a defective appliance download this repair information for help. See below.
Good luck to the repair!

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SONY CFS-905S SM service manual (1st page)
Preview of SONY CFS-905S SM [1st page]
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SONY CFS-905S SM service manual (2nd page)
Preview of SONY CFS-905S SM [2nd page]
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  • Also known:
    SONY CFS-905S CFS905S CFS 905 905S
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  • See related repair forum topics below. May be help you to repair.
If you are not familiar with electronics, do not attempt to repair!
You could suffer a fatal electrical shock! Instead, contact your nearest service center!

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Relevant AUDIO forum topics:
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keres Service Manual vagy kapcsolási rajz vagy más eszköz köszönöm
A STDBY-LED a bekapcsolás kb. 3 mp után kialszik.A STDBY-LED-R bekapcsolás után a 0 V feszültség ugyan annyi idő alatt 3,3 V ra ugrik, akkor a Q623 RT1P441C-TP-1 led drive nem tud működni. Az EVER+3.3V és az EVER 4V mindig mérhető. A készülék szervíz kézikönyve elérhető a Fórum oldalain. I found that VC1 0n IC11 is missing. After checking I found C25(330u 35V) s/c i.e. defect. The problem solved.
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Want to share: Have downloaded the schematics from this forum to help repair the amplifier of a friend. Turned out that Sony decided to route the earth through the chassis, even the earth between the various supplies. When one takes the main board out of the chassis and switches the amp on, there are up to 20 volts difference between the eart (and hence reference) of the pre-amps and the main amps. Luckily the amp goes into protection but from a design point of view it is not nice to rely on screws and aluminum face plates to conduct up to 0.2 amps of current from one supply to another. What I did is solder wires to every eart point and connected them on the main board to make it stand alone and not rely on conducting current through the chassis anymore. Bad design, simple repair but took some digging in the schematics to find out what exactly was going on!
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