How to make correct adjustment of CDM4 - diyAudio
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Old 29th November 2003, 06:25 PM   #1
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Default How to make correct adjustment of CDM4

Hi all pro,

There are two vars(potmeter) combo with CDM-4 laser pickup system (on the pcb beneath the CDM-4), 4K7 and 22K. As I know these VARs are for the adjustment of laserdiode output and focus.

Questions are:

How to make precisely adjustment. Does anyone has related service manual?

If I change a new CDM-4, do I need to re-adjust these var to a correct value? (I think my CDM4/19 is dying)

need your kindly help....
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Old 30th November 2003, 12:17 AM   #2
Cobra2 is offline Cobra2  Norway
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Cool What a hardcore diy'er do on a rainy saturday-night:

Having nothing better to do(?), I took the old laser out of my CD-16 (CMD4-d36) and swapped the internals(laser) from a new CDM4.19.
Only the platter-motor differs (exept the metal...)

And everything works well, playing now...

Arne K
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Old 30th November 2003, 02:47 AM   #3
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Hello Rudolf Broertjes,

I just search your previous post:
http://www.diyaudio.com/forums/showt...456#post120456

I think that's what I want to know now:

Quote:
I have the adjustement procedure for tracking & focus with the two test points (50mV and 400mV).
Where is these two test points: (or which registors?)
50mV is for tracking (laserdiode output)
400mV is for focus.

Is this done by using amp-volt meter to measure specific registor and check the amp cross it?

thanks
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Old 20th November 2004, 10:15 AM   #4
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Hi,
Any one knows where the test points for this 50mA and 400mA are?

I got the CD-player where someone turned two trimming pots all the way up!

Bartek
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Old 20th November 2004, 11:11 AM   #5
Cobra2 is offline Cobra2  Norway
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Default Adjustments

I guess it will be on different location in different players...
What make & model?

Arne K
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Old 20th November 2004, 11:44 AM   #6
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There are always 22K and 4,7K pots and all the chips are usually the same.

The model in question is Marantz CD 883 but I have a couple of other ,diffrent machines and with CDM4/19 laser/drive it's always the same.

In fact this Marantz CD 883 is identical inside to the Marantz CD 65MKII ,just the same main board.

I have similar procedure for CDM 2/10.It goes ..."measure acros this resistor near that chip...and so on"

I need similar procedure for CDM 4/19

Bartek
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Old 20th November 2004, 02:14 PM   #7
Bricolo is offline Bricolo  France
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Is the procedure the same for all CDM4 based machines?
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Old 20th November 2004, 03:07 PM   #8
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Quote:
Is the procedure the same for all CDM4 based machines?
I suppose it is.Chips and topologies are the same.

If any one knows it please share it with me.

Bartek
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Old 22nd November 2004, 08:13 AM   #9
rbroer is offline rbroer  Netherlands
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Here you are

Click the image to open in full size.
Click the image to open in full size.

Designators can/will differ between several versions.

Just look for similar valued resistors on the pcb;
Many old Philips players can be measured near top left of transport.
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Old 22nd November 2004, 11:44 AM   #10
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Many thanks Rudolf
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