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JVC RV-B70GY B70AG SM

AUDIO - SERVICE MANUAL
Type: (PDF)
Size
7.6 MB
Page
82
Category
AUDIO
SERVICE MANUAL
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  • Also known:
    JVC RVB-70GY B-70AG RVB70GY B70AG RVB 70 GY AG RV B70GY RV-B70GY
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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
JVC CA-MXS2BK hifi nem kapcsol be! Se kép se hang. A kijelzö sötét.Készenléti led se világít.
Üdv mindenkinek. Kérnék egy kis segitséget a "szakiktól" Van egy JVC CA-MXS2 hifim a mi egyik napról a másikra meg adta magát.Se kép se hang. Szétszedtem és a trafo melletti panelben bemértem pár alkatrészt.
D 542 = 33v
D 541 = 32.5V
D 539 =33.7 V
D 540 = 33.7V
D 582 =24V
D 583 =24V
D 584 = -10V
D 581 = -30V
D 580 = -30v
D 585 = -4.2V
D 587 = -12.7V
D 577 = 16.1V
D 575 = -8.9V
D 536 = NINCS ÁRAM
D 561 = NINCS ÁRAM
C 582 = 24.1V
C 583 = 23.5V
C 538 = 33.5V
C 539 = 33.2V
C 571 = 1.9V
C 575 = -0.9v
A sárga Matsushita relé  33vot mértem. De a 3 ellenálláson  0 voltot mértem. Szeretnék segitséget kérni hogy hol lehet a hiba. Nagyon jó kis hifi, már több mint 10 éve megvan.
Elöre is köszönöm a segitséget. Itt található a  kapcsolási rajz PDF-be, de ide nem tudom feltölteni,mert 13mb-tos.
JVC régi midi torony
Üdv mindenkinek: Keresném ennek a kb 25 éves JVC toronynak a rajzát, főként a tuner résznek. Feliratok: tuner PC-T5L erősítő PC-A5L magnó PC-D5L előre is kösz,Bálint
JVC UX-D66TN CD-lézer be azonosítás
Szervusztok! Van egy mini hifi amiben a lézerfej halott (JVC UX-D66TN). Ebben a készülékbe szerepel,sajnos nem tudom beazonosítani mert nincs semmi jelölés rajta. Ha valaki tudna segíteni azt nagyon meg köszönném. A lézerfej tipusa kellene hasonlit a SOH-AAU fejhez csak 15 PIN van rajta a (SOH-AAU-un meg 16 kivezetése van. Még egyszer ebben kérek segítséget. Várom megtisztelő válaszotokat. Üdvözlettel:buszosgyuri
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