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USSR TOPA 3-2.

AUDIO - SERVICE MANUAL
Type: (DJVU)
Size
415.9 KB
Page
15
Category
AUDIO
SERVICE MANUAL
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    USSR TOPA 32. 32 2. 3-2.
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Relevant AUDIO forum topics:
Akai HX-2 motorcsere után halk motorzaj hallatszik a kimeneten
Kedves Kollégák!

Egy Akai HX-2 deckben cseréltem motort, egy Sony deck motorját tettem bele: MMI-6S2LKS tipusút. A Sonyban hibátlanul működött, de az Akaiban halkan hallatszik egy motorzaj a kimeneten a számok között. Egyszerűen nem jövök rá az okára. Egy másik motorral is kipróbáltam, a saját Aiwa F 220-asomból tettem át, ami szintén jól működött, és avval is ugyanaz a jelenség. Tudnátok segíteni a megoldásban? A tápban a 12 Voltot biztosító áramkörben az elkókat már cseréltem, de ez nem hozott eredményt.

Előre is köszönöm, csabeszd.
Odakozmált NYÁK - újra gyártani az egészet, vagy..?
Üdv, Adott egy Castne CPA-600B -s erősítő, aminek az egyik oldalát 2 helyen sikerült elszenesítenie valakinek. A kérdés: az egész nyákot újra kéne tervezni/gyártani, vagy megoldható valami kisebb áthidalással szépen és jól? (gondolok itt pl kivágni a szenesebb részt, és a helyét kipótolni, vagy alulra v. felülre erősíteni javító-nyák-darabokat, vagy csak valahogy behuzalozni az oda való alkatrészeket.... ) Tudom, hogy az új nyák lenne az igazi, de mennyire fontos követelmény? Ki hogyan csinálná?
ION Archive LP Turntable

This is a compact design to I guess transfer the vinyl into MP3 format.
Complaint was when the arm was moved the tt dont spin, confirmed that as
theres a leaf switch to sense arm movement,
and its fed to a main pcb with all the IC's that I guess handle all the
stuff. The switch is ok, and I remember seeing 14V or so on the motor pins
frm the PCB, so I figured perhaps theres anough current to spin the motor and
focused on testing the motor.

Manufacturer does not supply the mainboard that feeds the motor but
the motor can be taken apart and after I opened it and
disconnected the small pcb fron the motor terminals and apply power
directly, it spins w 12v. theres a small electrolytic cap on the pcb 25V / 22uF and an
AN6652 4 pin T0-220 type case IC that I guess is some kind of speed control
circuitry.

The drive Motor is an EG-530-SD-3F, main board is stamped K-13007.
Gonna check the cap, but after searching this IC and its
applications with the motor, I see its popular and some drawings show how its used to regulate the 78,33
and 45 rpm speeds.

This drawing looks pretty much what I see in there:
https://tectronelectronics.eu/images/thumbnails/465/465/detailed/31/eg530.jpg
 

I have replaced the IC and the cap, but the motor still does not turn. The main pcb

is proprietary and cant be purchased, and I think it is giving the op-amp IC a reference signal.

Is there a way to bypass that signal or fool the IC to believing its on to test it out?

Photo showing the motor pcb :
http://www.mediafire.com/view/s79blgku1503mtg/HPIM0643.JPG/file
Photo of motor under test:

http://www.mediafire.com/view/thhgvcwac8al7gu/HPIM0635.jpg/file

 

 

 

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