CD player reads CD-Rs, but not CDs

[lim0nade]

Has the PSU had a recap as that is where suspicion might lie.

No, just on the servo board, but that's what I'll try next.
I might have to clean up after that, following this thread.
This thread also gives me hope.

 

[Mooly]

That's an old thread of mine 🙂

I would definitely look at the PSU before trying anything else.

 

[lim0nade]

"+5VCD" and "+9V_motor" go to the servo board. Voltages are stable, but on pin 9V_motor there is 9.9V. Is there a problem with that?
The caps in the main board power supply look good.

 

[Mooly]

You would have to study the circuit but as far as voltage goes I doubt there is a problem. It may not be tightly regulated to an exact value.

 

[lim0nade]

In the end it came down to internal cleaning which seems to have worked. This is definitely a very risky procedure because after assembly epoxy glue is used everywhere to secure it and it is very difficult to remove.

Thanks to everyone for your help, especially Mooly.

Cheers!

 

[Mooly]

Well done is all I can say 👍 🙂

 

[wparks]

There was a reason I made the suggestions I did, I was trying to save you trouble. After working on these for years, 90% of the time it's just dirty.