I need help in troubleshooting my yamaha cdx-1100.
The issue is that it can only occasionally read TOC. It only does that when spinning the disk fast and clockwise.
Most of the time cd-player struggles to spin the disk and after a very short time it starts to spin counter-clockwise.
Here is the movie showing the ploblem
https://www.dropbox.com/sc/8e46qwdsbc77ydw/AAC7VoY6sVt9mWU8fdpq79Mra
CD players has a DC brushed motor which is controlled by a photodiode and receiver located under disk platter. If I disconnect three wires (FG,LED,5D) from the main digital PCB, rotation speed of spindle motor increases slightly and CD reads TOC 70% of the time. The same time it won't stop the rotation of the disk when opening a tray.
I have checked:
- RF pattern
- Focus
- all voltages on ICs, OP-AMPs
- bad joints and wire connections
- some of the caps with ESR meter
Everything seems to be fine.
Any ideas?
Thanks
The issue is that it can only occasionally read TOC. It only does that when spinning the disk fast and clockwise.
Most of the time cd-player struggles to spin the disk and after a very short time it starts to spin counter-clockwise.
Here is the movie showing the ploblem
https://www.dropbox.com/sc/8e46qwdsbc77ydw/AAC7VoY6sVt9mWU8fdpq79Mra
CD players has a DC brushed motor which is controlled by a photodiode and receiver located under disk platter. If I disconnect three wires (FG,LED,5D) from the main digital PCB, rotation speed of spindle motor increases slightly and CD reads TOC 70% of the time. The same time it won't stop the rotation of the disk when opening a tray.

I have checked:
- RF pattern
- Focus
- all voltages on ICs, OP-AMPs
- bad joints and wire connections
- some of the caps with ESR meter
Everything seems to be fine.
Any ideas?
Thanks