Can You please help me find failure in my Marantz CD75MKII player

[zygibajt]

Hi,
I'm having troubles with locating the failure in one of my Marantz players.The problem is the player doesn't spin the CD itself,but when I spin it with my hand it works good,plays music and jumps from track to track easily.It seems like the motor gets too low current.It seems like 1:10 it needs becouse it berly move the CD without help.

I have three diffrent CDM4/19 transports and check diffrent one ,so its not the motor.

I also changed SAA7210 and MAB8441 chips from working player,didn't help.

Also changed all electrolitic caps in power supply.
Didn't help either.

Any one have idea what can it be??

Thanks for any advice.

Bartek