CD80 service manual?

[Tomg]

Does anybody actually have a copy of this I could have at all?

thanks,

Tom

 

[Jocko Homo]

I do, but have never had luck trying to scan it.

Specific question?

Jocko

 

[Tomg]

erk, no specific question I just have two of these machines to work on

One does have a problem with the switch on and off of the muting relays though...

 

[Jocko Homo]

There is a DC protection scheme that mutes the relays. Or "relais" in their parlance. It also kills the "play" LED on the front panel when the protection is activated.

Jocko

 

[renes3]

Thanks Jocko,

I was wondering why my play led was only working for a short time, and after a while stops working😉

 

[Tomg]

Well I have one machine which works perfectly, the muting relays function as they should, turn the player on, couple of seconds later and they click.

On the other machine the relays click as soon as you turn the machine on, you get pops on the output and then when you turn it off, you again get pops and half a second later the relays cut in. It almost seems to be working in the opposite way to how it should be.

 

[rfbrw]

Well I have one machine which works perfectly, the muting relays function as they should, turn the player on, couple of seconds later and they click.

On the other machine the relays click as soon as you turn the machine on, you get pops on the output and then when you turn it off, you again get pops and half a second later the relays cut in. It almost seems to be working in the opposite way to how it should be.

DC on the output perhaps ? Duff IC, leaky cap? Check the usual suspects.

 

[Tomg]

I wish I knew how to or where to look 🙁

any pointers as to where I should be looking (part nos etc)?

 

[Jocko Homo]

It uses a servo, and not coupling caps.

Servo: LM308......#s 6390, 6391..........goes to buffer/LPF '5532............# 6393. (One buffer does both channels.)

Connects to I/V stage '5534...........#s 6384, 6385. Pin 2 on both.

Pin 6 of output '5534......... #s 6386, 6387.......should be 0 V DC.

Hope that helps some
Jocko