Sony MDS-JA50ES not Play /not spin

[Bogdan Edulescu]

Hello colleagues. Help me , with the following very annoying problem. I'm convinced that it's an insidious flaw, but I just don't get it. I have above average knowledge in troubleshooting.

A Sony MDS-JA50ES does not want to Play ! and does not spin the disc! The lens rises, 2 times and looks OK. Eject and load-in MD, works superb. Display also. ON/OFF OK.  

I cleaned, lubricated and checked everything!  Microswitches, cables, contacts - everything in sight works normally.  And yet, the disk does not spin...! After few second, NoDisc appears…or Error disc and eject it.

Please, any help or trick can be helpful. Thank you very much

[kgallen]

Welcome!

 

It might be blind.

 

Find the Service Manual then find the Check entry for IOP and see if that reports NG (no good) or OK.

 

https://www.minidisc.wiki/_media/equipment/sony/deck/sony_mds-ja50es_service_manual.pdf

 

 

[Bogdan Edulescu]

thanks. i have the SM, but i don't find any clue to solve this ... i will check the 3 motors if it spins with external voltage. at least i will find if the motors are ok ...no cluster off

 

[kgallen]

I think it's unlikely the spindle motor has failed, but of course it is possible.

 

For further diagnostics, ideally you need a laser power meter and DVM to check the Iop and laser output. This is a servo system, the disc won't spin unless the CPU can see there is an inserted disc. One reason for this detection not happening is there is no reflected light from the laser.