Aiwa ad-6900 controls not work

Aiwa ad-6900 commands do not work.
the controls on the unit do not even power on, does anybody know what parts should I check in the PCB? The relay is like new, the main transistor on the power supply (the one with heatsink) is OK, the two motors spin, the meters power on, the big electromagnet switch is OK, all the to 220 transistors are OK on the electromagnet switch PCB.

Please any body help.