Service manuals, schematics, eproms for electrical technicians

UNIVERSITY-SOUND 583 SCH.

AUDIO - SERVICE MANUAL
Type: (DJVU)
Size
8.3 KB
Page
1
Category
AUDIO
SERVICE MANUAL
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    583 SCH. SOUND
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Relevant AUDIO forum topics:
SONY SRP-P2025 erősítő (усилитель УНЧ SONY SRP-P2025)
I need a diagram and description of the SONY SRP-P2025 amplifier. It does not turn on, only the LED output indicator does not work and lights up, the high-current circuit does not work.
Пишите на английском или венгерском языке!

модератор
Grundig rádió kapcs. rajz
Tisztelt Kollegák ! Kapcsolási rajzot keresek egy rendkívül fontos javításhoz.Persze a tulaj fontos a készülék elég siralmas.Meg kell javítanom.Egyenlőre nem szól, de programozni lehet.Tehát a tipus: Grundig prima boy 100 G.RG15 táskarádió Segítségeteket nagyon köszönöm, üdv. hanuman
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

 

 

 

Pioneer VSX-LX102 not power on
Working on one of these, they say it was at Pioneer service center and
they claim its got a bad HDMI board. They wanted more than the product retailed for
to fix.

I cannot get it to power up, does not seem to be any standby power....they claim one day it just did not power up.
Cannot locate a SM.
 
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