sanyo dc-d27 u mini system with odd cd problem

[b]

Hi,
this unit will begin to spin up the cd, but after a couple of seconds a
mechanical click is heard. At that point, the disc starts spinning
counterclockwise. No TOC is picked up and 'No disc' message is
displayed.

I checked the sled mech, moves freely. As does the spindle motor.
Endstop sensor seems Ok too. I just don't know what that mechanical
click is caused by.The 3 disc multiplay load mech remains still.

Anyone seen this problem? My next step is going to be checking the
ribbon cable to the pickup tho' I don't see the connection between that
and the mechanical clicking, I am treating this as a mechanical problem
at present rather than electronic so I'd really appreciate any
suggestions...

Regards,
-Ben

 

[JVC Dude]

I wouldn't think its the ribbon, as usally it will read TOC ok but fail to
play later tracks when thats at fault.
I would just replace the laser. The click you hear is the laser losing
focus. It is able to hold locked on until the disc spins at which point the
weak sensor in the laser unit can't hold lock any more.
Just occasionally it may be a spindle motor... follow me on this... the
current needed to spin the motor with shorting brushes, pulls down a rail
somewhere thus tripping up another part of the circuit. See if the flatpack
IC for driving the motors (usually has big central earthing/cooling pins) is
getting rather warm, when you repeatedly try to read discs..
hope that helps.
Andrew

 

[b]

I wouldn't think its the ribbon, as usally it will read TOC ok but fail to
play later tracks when thats at fault.
I would just replace the laser. The click you hear is the laser losing
focus. It is able to hold locked on until the disc spins at which point the
weak sensor in the laser unit can't hold lock any more.
Just occasionally it may be a spindle motor... follow me on this... the
current needed to spin the motor with shorting brushes, pulls down a rail
somewhere thus tripping up another part of the circuit. See if the flatpack
IC for driving the motors (usually has big central earthing/cooling pins) is
getting rather warm, when you repeatedly try to read discs..
hope that helps.
Andrew

thanks for that, will look into it further next week.
Ben