Service manuals, schematics, eproms for electrical technicians

VEF-M-1357 1945 RUS.

AUDIO - SERVICE MANUAL
Type: (DJVU)
Size
150.9 KB
Page
4
Category
AUDIO
SERVICE MANUAL
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  • Also known:
    VEFM-1357 VEFM1357 1945 RUS. VEFM 1357 VEF VEF-M-1357
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Relevant AUDIO forum topics:
Mitsubishi DA-U540 erősítő végfok beszerzése- helyettesítése
Sziasztok! Szeretnék érdeklődni, hogy rajtam kívül, javított-e valaki ilyen erősítőt végfok hibával, és sikerült-e beszereznie hozzá alkatrészt??? (STK1039) A tápegységet, a tanyás rajz alapján sikerült kijavítanom (köszi) :D el is indult, viszont végfok alkatrészt nem találok hozzá! Bármilyen megoldás, ill. helyettesítő alkatrész info érdekel! Előre is köszi! Üdv: Zsolti
eeprom 8582
sziasztok--nos azt szeretnem kerdezni,hogy a ponyprog programozo melyik verziojanal van meg a 8582 tipusu memoria,mert 2000-es verzion nincs ez a tipus,esetleg adat kiolvasas szempontjabol valamelyikkel ekivalens-e,mondjuk 24cxx sorozatbol?...udv...
JVC KD-S641
Sziasztok! Ennek a gépnek az a hibája, hogy nem veszi be a lemezt, a mechanikát már átnéztem, de nem találtam problémát. Ha benne marad a lemez, áram alá helyezve kiadja azt, de be már nem. Külső táppal meghajtva a motort beviszi, és ki is adja a lemezt. A meghajtó icénél mértem 5V-ot, és 3V-ot, de mit kellene még ellenőrizni?
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
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