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WESTERNELECTRIC WE-121A VINTAGE AMPLIFIER SCH

AUDIO - SERVICE MANUAL
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AUDIO
SERVICE MANUAL
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    WE-121A VINTAGE AMPLIFIER WE121A WE 121 121A
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Relevant AUDIO forum topics:
Orion HS 200 hangváltó felújitása MEGOLDVA!
Sziasztok! Végigolvastam az oldalon a HS 280 hangváltó bekötés problémát,ugyanebben a cipőben járok én is.Kaptam egy HS200-as 4 Ohm/25W orion hangfalat,gondoltam jó lessz centersugárzónak.A hangszórók kifogástalan állapotban vannak.A gondom az amit olvastam a fent emlitett topikban is.Miért van forditva bekötve a magassugárzó kondija(a pozitiv sarka megy a dómsugárzóra).És nem nagyon értem,hogy miért 10Mf,szerintem 4.7Mf kéne lennie.A középsugárzónál is 10Mf van ezt még értem.A mélynyomón 47Mf van paralel.Én kicserélném mind a hármat bipolárisra.És természetesen átkábelezem elfogadható kereszmetszetü vezetékkel.(ami benne van na az öv alatti)Azt kérdezném Tőletek hogy a magasra jó ha 4.7Mf kondit teszek? Szeretném ezt a hangfalat rendbe hozni. Üdv Mindenkinek! György
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

 

 

 

SOKOL 403 rádió 9V helyett 5V

Sziasztok!

Bocs, hogy a HiFi kategóriába került laugh
Kérdésem az lenne, hogy ha csak 5V-ról üzemeltetem, akkor a hangerő csökkenésén kívül romlik a vétele minősége is? 
Felmerült, hogy powerbankról akarják táplálni, és kellene 5-ről 9V átalakító. Mivel 5V-ról is szól, gondoltam elég lenne csak egy USB kábel rá.
Jácint

Serioux SBHT5100C -nincs hang a hangfalakban
Udvozlok mindenkit!Van ez a Serioux 5.1 hangfalas hazimozi erositom,es nincs hang a hangfalakban...ket kicsi hangfalban megy a hang nagyon-nagyon halkan,ha felhuzom max-ra a hangerot!Nincs valakinek egy jo otlete,vagy akar rajza hozza!?Koszonom.
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