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MINERVA TR100 SCH

AUDIO - SERVICE MANUAL
Type: (PDF)
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738.1 KB
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1
Category
AUDIO
SERVICE MANUAL
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  • Also known:
    MINERVA TR-100 TR100 TR 100
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Relevant AUDIO forum topics:
SONY CDP-970 CD lejátszó optikafej, lemez, ill. tálcanyitó motor vezérlési hiba - MEGOLDVA -
Üdv: Lenne egy olyan problémám, hogy az adott CD lejátszóban tápkondikat cseréltem és egy olyan hiba lépett fel, hogy bekapcsolás után azonnal kinyílik a tálca ill. az optika teljesen hátramegy. Az tálcát és az optikafejet mozgató motor egyfolytában jár. Az összes szalagkábelt megnéztem, helyükön vannak. Mi lehet vajon a gond? Köszönöm. Tisztelettel: Károly Megoldás: Az eredeti TO92 tokozású ellenállásbiztosíték kiforrasztása és egy korrektebb 5x20mm foglalatú biztosíték aljzat kiépítése. Lsd. mellékelt képek.
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
Pioneer vsx-831 nand flash írót keresek
Sziasztok. Olyan illetőt  keresnék,  aki pioneer erősítő nand flash tartalmat tudna újra írni. 
Siva pa300
Sziasztok! Volna egy kérésem: Kaptam egy Siva PA300-as végfokot. Sajnos mind a két oldalát kinyírták, és vannak rajta olyan ellenállások, amik szénné égtek. Rajzot keresek hozzá, vagy ha valakinek van ilyen erősítője, kérem fotózza le a panelt, hogy lehessen látni, milyen alkatrészek mentek tönkre az enyémben. Várom válaszaitokat! Üdvözlettel: saca200
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