Marantz CD17 - The unbalance output are low at both channel

Hi guys,
A help needed from your guys.

A friend of my are own a Marantz CD player CD17, recently his enconuter a problem. The unbalance output are low at both channel.
The are no change while adjusting the internal output level of the CD player itself.

The result of the diagnostic.

By playing a Denon Test cd with a track 1 KHz signal S-wave at 0db.
It's only have a out voltage 0.2 pp Volt at both left and right.

And traced back to HDAM out and in stage and result showing at the scope only 0.2 pp Volt.

One more step back to op2114 out stage and same result showing at the scope.

Finally, at the last test point to trace, the TDA1547 output and same result showing at the scope.


any idea whats wrong of the unit ?
may any one know where can buy the service manual of this model.

Thank you guys

Han

 

You could check the caps and supply voltages to the tda1547 chip.

I don't know much about this model

 

Dear zanash,

Thank you for your reply.



Confirm the TDA1547 IC are not working well, I am waiting the new TDA1547 ic.



Cheer.

Han