ADCOM GCD-575 Issue

[44100_Hz]

Hi All!

I've recently acquired an ADCOM GCD-575 single-disc CD player. When I received it, it was working as expected. However, I'm now encountering an issue where the only output from all analog outputs (line, variable, headphone) is a low hum and variable interference that sounds almost like holding your ear up to a shell from different distances away (but maybe tracking the levels of the CD playing). All other functions seem to be working, the CD is spinning and the counter advances at normal speed. Any idea where I should start on diagnosing and repairing the issue? (I should note that I'm not set up to test digital output, but can work that out if necessary.) Thanks so much!

 

[dimanag]

Hi!
I am not familiar with this model but first find the service manual.
There is an analog power supply and one for digital section!
On analog power there is +15, -15, +5 and -5 volt supply!
Check on wcp201 pin 1 for 15v and pin 3 for -15v. Pin 2= gnd !
These supply the opamps for fix, variable and headphone output!
I would start from here!

 

[44100_Hz]

Hi!
I am not familiar with this model but first find the service manual.
There is an analog power supply and one for digital section!
On analog power there is +15, -15, +5 and -5 volt supply!
Check on wcp201 pin 1 for 15v and pin 3 for -15v. Pin 2= gnd !
These supply the opamps for fix, variable and headphone output!
I would start from here!

Thanks so much for the advice! I'll get started with that

 

[yesterdaze]

Hi!
I am not familiar with this model but first find the service manual.
There is an analog power supply and one for digital section!
On analog power there is +15, -15, +5 and -5 volt supply!
Check on wcp201 pin 1 for 15v and pin 3 for -15v. Pin 2= gnd !
These supply the opamps for fix, variable and headphone output!
I would start from here!

Hi!
I am not familiar with this model but first find the service manual.
There is an analog power supply and one for digital section!
On analog power there is +15, -15, +5 and -5 volt supply!
Check on wcp201 pin 1 for 15v and pin 3 for -15v. Pin 2= gnd !
These supply the opamps for fix, variable and headphone output!
I would start from here!

Hello, I'm having the same issue with my GDC-575. Very low analog output to the amplifier - the same in both left/right channels. I managed to remove the brown glue, before replacing more tha a dozen electrolytic caps and substituting the decoupling caps in favor of the film type caps (upgrade) as suggested on this forum. Still no change realized to the analogue output. I did confirm + 15v and -15v along pins 1 &3 on wcp201, but none of the other pins gave me + 5v and - 5v. The large power supply transistors are giving off plenty of heat. Before I begin replacing the transistors at and beyond the power supply, due you have any other ideas?