HELP! Marantz cd65 MKII fault - diyAudio
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Old 16th October 2010, 01:12 PM   #1
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Default HELP! Marantz cd65 MKII fault

I have a super problem: my Marantz CD65 mkII, while adjusting the focus of the lens (trimmer 22k), has begun to smell of burning on the side of the trimmer (with a light smoke), but I did not understand where it came from. I changed the 22k trimmer but the result has not changed.

Now the lens is locked in one position (upper bound) and the laser does not emit more "light" ...

I thought I was a "burning" of the IC TDA5709 or TDA5708

Any ideas?

HELP!!! Thank you!

PCB : Click the image to open in full size.

Last edited by antony28; 16th October 2010 at 01:36 PM.
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Old 18th October 2010, 11:28 AM   #2
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I would not be wrong but I checked several times and all the resistance around the TCA0372DP2 have power equal to zero volts.

I also noticed that the heat TCA0372DP2 lot but I think it's normal.

I think the problem is in that area ...

I forgot to tell you that the lens is the philips CDM4/19.
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Old 18th October 2010, 11:59 AM   #3
Mooly is online now Mooly  United Kingdom
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The problem could be anything... get a circuit and check all the supply rails are present and correct. You may have a rail missing (open circuit safety resistor).
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Old 18th October 2010, 08:40 PM   #4
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Almost all the capacitors have become short-circuit (1ohm more or less). In the image I have marked almost all :-)

The tension of the IC 6526 (Motorola) is less than 1 volt. Now, the lens does not receive any signal, as off. The IC 6526 does not heat anymore so I assume it's broken.

Now I try to replace the IC 6526 and all resistances damaged.

Click the image to open in full size.

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Old 18th October 2010, 09:26 PM   #5
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The components marked are resistors NOT capacitors !!

Do you have a circuit diagram ?


Andy
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Old 18th October 2010, 09:59 PM   #6
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Sorry, I was wrong to write, of course, are resistors.
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Old 2nd March 2014, 10:22 AM   #7
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Quote:
Originally Posted by antony28 View Post
Sorry, I was wrong to write, of course, are resistors.
And Do you have same conclusion ???
You solve the problem?
Ciao
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Old 2nd March 2014, 11:54 AM   #8
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I would look at the components around the laser drive transistor. The laser will be unable to focus if it hasn't got a supply.
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File Type: jpg Laser Drive.JPG (145.2 KB, 47 views)

Last edited by KatieandDad; 2nd March 2014 at 11:58 AM.
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Old 8th July 2014, 09:49 AM   #9
stenks is offline stenks  Serbia
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Default Marantz cd 65 MKII laser adjustment procedure

Can help.
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File Type: jpg Laser diode current adjustment.JPG (112.7 KB, 10 views)
File Type: jpg Focus adjustment.JPG (116.6 KB, 9 views)
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