1. Home
  2. Electronics Repair
  3. need help with Pioneer CD changer

need help with Pioneer CD changer

I have a Delco 12 cd changer, I believe it was made by Pioneer, it's model CDX-M12G. The changer portion works fine, but the CD player has some issues.

With the cover off I can watch it load the CD, it spins it up and tries to read the table of contents. The head moves in and out 1/4" over the inner radius, and it tries 3 times to read, then gives an "error" and stops.

I did try various new CDs, not burned disks. I also carefully cleaned the lens with a q-tip and alcohol, as described in the FAQ. There doesn't look to be any scratches on the lens itself (I lifted the head off the servo and looked at it with a magnifying glass).

I'm really not sure what (if anything) to do next. It seems like there is a lot of the circuit functioning, and it seems like it's trying to play, but something is obviously failing. What can I check next? I do have a scope, if that would be of any use troubleshooting.

Thanks in advance for any suggestions!

Reply to
Michael Hamilton
Loading thread data ...

I asume you've , with caution, seen some sort of deep red glow off the laser. You could precisely measure the resistance of the power preset , both directions JIC so you can get back to the pre-existing state, then adjust the preset by the smallest amount you can turn it , to decrease the resistance. Aim for no more than 5 percent decrease before retrying.

-- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on

formatting link

Reply to
N_Cook

Well, no, I never was able to look for the laser glow... mostly because of the way the changer is positioned I can't easily see into the unit with the cd magazine in place. I kind of assumed it wouldn't be able to focus if the laser wasn't working to some extent (that's a big assumption on my part, I don't really know much about cd players).

That power preset adjustment, is that the pot that's on the laser head? I will try that (and try to look for the laser glow).

BTW, forgive my ignorance, I haven't bought the schematic for this yet, as I didn't know if it was worth throwing any more money at yet (I see Sams does have, though).

erse.4mg.com/index.htm

Reply to
Michael Hamilton

ElectronDepot website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.