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Yamaha CD-1 start problems
Yamaha CD-1 start problems
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Old 8th November 2017, 11:40 AM   #1
Courtec is offline Courtec  Netherlands
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Default Yamaha CD-1 start problems

Dear members,
I have a Yamaha CD-1 player from the past. This thing is very complicated. When i load a disk it loads it but the disk does not start spinning. There is no laser light visible from the laser and no tracking movement from the laser head.

All power supply voltages are present. Also the sub power supply's on the servo board and the logic board.

The little board with a optical device does see the disk spinning (by hand) and there is some pulsing from the out connector.

Can anyone help me get started with troubleshooting. Is there a known issue with there players? for example the cabling or the connectors? I already did a visual inspection on the boards and solderd some bad junctions.


Any help is much appreciated.
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Old 8th November 2017, 12:00 PM   #2
JonSnell Electronic is offline JonSnell Electronic  United Kingdom
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I worked on many of these as a Yamaha Agent.
What happens when you insert a disc is as follows;
Drawer closes and the laser assembly returns to the centre of the disk. The laser then lights, the disk spins up and Focus is attempted.
In your player, move the laser assembly towards the outer of the disk then insert a disk.
Does it attempt any of the above?
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Old 8th November 2017, 12:05 PM   #3
JonSnell Electronic is offline JonSnell Electronic  United Kingdom
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Here is the manual, from 1992!
YAMAHA GT-CD1 Service Manual download, schematics, eeprom, repair info for electronics experts
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Old 8th November 2017, 12:16 PM   #4
Courtec is offline Courtec  Netherlands
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Thank you for the response Jon. I see you are in the same business as me. When the drawer closes the head if moving to the center of the disk. That part is working. After that nothing. This CD player is different from the service manual link you mentioned. This is the older first one from yamaha, the CD-1 with the drawer on the left side.
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Old 8th November 2017, 12:49 PM   #5
JonSnell Electronic is offline JonSnell Electronic  United Kingdom
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Similar mechanism and if you can read Chinese, useful for fault finding. I have misplaced my original but from memory, replacing the laser mechanism will restore the functions. They do however require setting up with a laser power meter as they were not pre set power levels.
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