Problems with Marantz PM630

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Hy.I have a big problem with my Marantz PM630 receiver.When I put the sound signal to MAIN IN (the receiver has MAIN IN and PRE OUT) it sounds great,but at a very low volume and I have no control on it.If I put the signal to CD Input I only hear some kind of "bruum" and no music.
Do you have any ideea of what can I do?I checked all the tranzistors (NPN and PNP) and they are all in good shape.Is there an IC that must be changed?
MANUAL MARANTZ PM-630 SM Service Manual free download, schematics, eeprom, repair info for electronics
Thank you!
 
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