Very rare Motorola/bgh turntable HELP!

[dovganj]

P1020754 — ImgBB
P1020741 — ImgBB
Hi there, I got this Motorola SC-320 AM radio turntable combo from Argentina.
Radio works for a while, then it shuts. Turntable moves and stucks.
I want to try to fix it but I don't even know what I see.
Any help?
Has anyone seen a similar Motorola combo? I need some basic instructions on how this things work so I can check it out a piece at the time.
Where's the amp line in? How could I feed it another sound singnal to test the amplifiying system?

Thanks in advance.

 

[Richard Ellis]

Have you fixed electronics before? I see several examples on Mercadolibre for sale...it seems to be a stereo unit.
These devices are rather simple in design & layout...first off, it most likely hums at 50 hertz...a low buzzing sound. Those capacitors in your picture are likely dried out & would need replacing for the power supply to work right.




Yes, likely you could tap into the amp to play music from other sources, EG, CD...from a low-level source.
We need to dig up a schematic to get you started.





------------------------------------------------------------------Rick......

 

[dovganj]

There are some for sale on Mercadolibre but no info about the circuit. It seems to be simple but difficult enough for me. I can't find any schematics online. Anyways I think I could take off with some advice from this forum.

 

[JMFahey]

It´s a locally made product so you will not find data outside Argentina.

Are those ECL82?

Get the recommended datasheet schematic, BGH won´t go too far from that.

I have seen (and had) old 70´s Service Manuals covering those and other brands, such as Winco, Ken Brown, etc. but hey have disappeared long ago.

Try some Argentine Forum such as yo reparo . com . ar and similar.

EDIT:
here is the SC300 schematic,which must be very close (if not identical)
You need to registed or login to see it:
Tecnicosaurios.com • Ver Tema - @ Motorola SC320 Combinado Valvular

others:

Reparacion Combinado Motorola BGH sc 320
- YoReparo

Historia del Audio en Argentina | Pagina 2 | Foros de Electronica

DIAGRAMA BGH BL3201S - mundotecnico.info - Foro Tecnico Reparador

 

[dovganj]

Thank you very much, I'll check it out.

 

[Richard Ellis]

Maybe?











-----------------------------------------------------------------------------Rick...

 

[JMFahey]

Must be very close. What else?

 

[PRR]

> AM radio turntable combo .... Radio works for a while, then it shuts. Turntable moves and stucks.

We don't really need a schematic. Why would it work a while then "shut"? Why would it move and "stuck"?

I have a feeling that "shut" and "stuck" are not the best words, more information might help. Language differences?

 

[stocktrader200]

maybe a crap selenium rectifier failing as it gets warm, replace with 2 1N4007 1000 PIV diodes.

 

[JMFahey]

Maybe it´s something "mechanical", such as poor/dirty/corroded radio/Phono switch and crystallized/missing grease on rotating parts , gears full of dust and lint, etc.

It´s > 50 y.o. and God knows what humid basement or leaking roof attic it was stored in.

Half the work will be cleaning it.