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GOLDEN TUBE AUDIO SI50 POWER-MODULE SCH

AUDIO - SERVICE MANUAL
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AUDIO
SERVICE MANUAL
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    GOLDEN TUBE AUDIO SI-50 SI50 SI 50 POWER MODULE
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Relevant AUDIO forum topics:
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

 

 

 

Technics su-v505 erősítő dióda kiváltása.
Tiszteletem! A fent nevezett erősítőben zárlatos lett pár db dióda ,ami oa90 germánium.(d308,d302) Kérdésem az lenne hogy mivel válthatnám ki? Pl 4148? Üdv:Imre
Pioneer VSX-D2011 Házimozi erősítő standby hiba.
Üdv. Mindenkinek! A fent nevezett pioneer receiver a következő hibát produkálja: Rövid idejű hallgatás eltelte után kikapcsol. Rögtön utána nem kapcsol be, standby led sem világít. Ilyenkor ha a hálózatból kihúzom, vagy a fő áramtalanító kapcsolót off állásba nyomom, pár óra múlva ismét bekapcsolható, de alap állapotba hozza magát mintha resetelve lett volna a készülék. Elfelejt minden beállítást, ekkor ismét hallgatható rövid ideig aztán megint lekapcsol. Előfordul hogy ha próbálom bekapcsolni a stanby led halványan világít, vagy pulzál, de ilyenkor nem lehet visszakapcsolni. Próbáltam mindent lekötöttem a készülékről akkor is kialszik egy idő után a standby led. Az első hibajelenség: spontán hallgatás közben kikapcsolt. A készülék túlfeszültség védőn keresztül kapta az áramot. Várom a hozzáértők hozzászólását. Köszönöm!
Akai AA-V25 radios erosito nem a valos frekit irja ki.
Sziasztok. Hozzam kerult ez a cimbeli, jobb napokat is latott radios erosito. A kijelzo hattervilagitasara szolgalo izzot kellett cserelni, es mukodik is. Csak eppen 0.1MHz-el nagyobb frekit ir ki, mint a valodi. Ez a problema mibol adodhat?
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