Service manuals, schematics, eproms for electrical technicians

SUPERPHONE DERBY-569 1955 SCH

AUDIO - SERVICE MANUAL
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AUDIO
SERVICE MANUAL
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    SUPERPHONE DERBY-569 DERBY569 1955 DERBY 569
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Relevant AUDIO forum topics:
Turntable Victor/JVC TT-71
Given:

Victor TT-71, neon lamp does not light, speed is lower than normal.  This is subsequent some short circuit the owner does inside the device.  No further details.

I found out the VICTOR QL7 have the same motor driver amd I downloaded the service manual that I attached here in case this manual is not already uploaded.

Looking at the diagrams I found out that at TP3 (same with pin5 of IC803) instead if that rectangular signal, I have nothing but 5VDC and a negative or positive short spike whenever I'm starting or stopping the motor and 
Under the circumstances I suspect IC803 is defective.  The bad thing, IC803 is NPC SC8043.  Also I wonder if the crystal is fine (except that I wonder what can be wrong with a crystal after some short circuit).

Does anybody have any more suggestion?

Also, where can NPC SC4043 be sourced?  Also, a crystal 9.054MHz?

Thanks in advance,
Corneliu
Schematic diagram for portable player Thomson TM 9670
Hello everybody in Hungary,
I am looking for schematic diagram of portable player THOMSON TM9670.
When I connect an USB drive into the machine, the normal supply voltage 5.5V drops to approx. 2.0V in dependency of each usb drive. The player reports that no usb is connected.
I found out that power supply circuit comes from transistor D882L – from pin No.3 which is base pin. This doesn’t make any sense to me. I would expect it should be connected to collector or emitor pin. Therefore I need schematic diagram or service manual for this player.
Thank you in advance for any help.
Regards,
smith666
SONY CMT-S20B mini hifi kijelzője gyengén világit :
Sziasztok ! A fenti hibán hogyan lehetne segíteni zöld színű fűtőszálas kijelző van benne pontosan nem tudom megnevezni a típusát. a fűtő fesz 24volt helyett csak 23 volt ez lehet a gond? Üdv nektek!
Sherwood RD8108R erősítő kijelzőjének fényereje folyamatosan csökken
Sherwood RD8108R házimozi erősítő kijelzőjének fényereje folyamatosan csökken.Már sötétben is alig látható.Mi lehet az oka?
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