Height of turntable in CDM1 - diyAudio
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Old 20th September 2010, 02:24 PM   #1
diyAudio Member
Join Date: Jul 2005
Location: italy
Default Height of turntable in CDM1

Hi all.
I'm going mad with a problem.
No, with a solution.
Anyway: i have a cdm1 that don't read toc.
If i push play without a disc inside, the display says ERROR.
When i put disc in, the player don't read TOC.
If i turn a bit clockwise the screw 51 on the motorshaft, the player become normal, and read ALL. CD, CDR, hot dog.. :-).etc..

So my question is, please:
What kind of problem its solved turning clockwise the screw 51, ie, increasing the space between laser and disc surface? Where is problem?

And, please, how i could adjust the tension , 0V, across R3240, in servo 1 board, every time i set a new height of the turntable?
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Old 20th September 2010, 09:56 PM   #2
diyAudio Member
Join Date: Oct 2006
By turning in that bottom bearing 'screw', you are simply compensating for wear on the bearing surface. Once you have it 'dialed in' to play all manner of discs, you are in good shape, and need not do anything else.
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Old 21st September 2010, 07:15 AM   #3
diyAudio Member
Join Date: Jul 2005
Location: italy
So, is it a no-problem at all?
It's strange. What is the reason when player don't read anything?
I ask for that because i turned clockwise the screw many times in the last year, to solve the problem.
So the question is not mechanical, or i think so..
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Old 21st September 2010, 10:38 PM   #4
diyAudio Member
Join Date: Oct 2006
The only reason you might need to adjust it more then once in a year is if you did not lock the position of the bearing screw with a little bit of glue. Without glue, the rotation of the motor could gradually turn the bearing screw.
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Old 22nd September 2010, 06:51 AM   #5
diyAudio Member
Join Date: Jul 2005
Location: italy
Stephen, thank you for your kind attention.
i'm agree with you, obviously. This could be a normal fact.
but i think this is not my situation..
As you could imagine, when i start to turn a pot or a screw, as now, i mark with a pen the start position and the final one's.
So my surprise was great, when CDp falls to read toc again, and the screw 51 is it's right position. I don't have a oscillposcope, so i cannot see where the chhnge start in electronic...
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