Service manuals, schematics, eproms for electrical technicians

NEUMANN KM-88I MIKROFON SCH.

AUDIO - SERVICE MANUAL
Type: (DJVU)
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27.9 KB
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1
Category
AUDIO
SERVICE MANUAL
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    NEUMANN KM-88I MIKROFON SCH. KM88I KM 88 88I
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Relevant AUDIO forum topics:
SONY STR-AV270X
Sziasztok! Van ez az erősítőm, az a gondom vele hogy nincs kijelzés rajta így nem is működik. A rajzott letöltöttem hozzá, de afolia ami az előlapra megy az egyes lábon testet ír, de én itt 12V-ot mére, lehet hogy hibás a rajz, vagy megszakadt valami benne. A fűtése megy a kijelzőnek, meg dereng néha benne valami. Mi lehet vele, mert én még nem találtam benne csak egy zárlatos zénert, de ezen felül semmi mást.
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
Philips FW76/22B SM keresés
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Üdv! Tudtok-e valami üzletet, webáruházat ahonnan beszerezhető ilyesmi? Esetleg használt is érdekelne. A Monacornál drivert láttam, de kültéri tölcsér nincs hozzá... :(
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