Question about Marantz CD-48 CD Player

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Marantz CD48 - CD spins backwards

Although I am a qualified electronics engineer,I have not been able to solve this problem on my Marantz CD 48 player.When a CD is inserted,the unit does not read the CD but instead it spins counter clockwise at very high speed. When switched on,the Display shows..Read > No Disc and then the CD rotates counter clockwise.No functions work at this stage and the power has to be switched off and on again to eject the disc.The Laser does not seem to be switching on either. Could someone help me solve this problem please?

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Re: Marantz CD48 - CD spins backwards

Check the small signal transistors BC338 and BC328, they're under the transport mech and will be near where the spindle motor plugs in to the PCB.
One of the transistors acts as a brake which momentarily puts the motor in reverse polarity to stop the CD rotating during 'stop' or 'open tray' modes. The reason the CD is spinning backwards is that the transistor which drives the spindle motor forwards during playback is faulty and is triggering the braking transistor hence spinning backwards.
The transistors should be 'BC328-25' / 'BC338-25' (25v)
Replace these and all should be well.

Hope this helps

Posted on Sep 01, 2012

Re: Marantz CD48 - CD spins backwards

Is the master clock generator oscillating? Probably a 16 ish MHz crystal.

Posted on Dec 04, 2007

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