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Philips CD960 problems
Philips CD960 problems
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Old 7th December 2017, 01:03 PM   #11
ClassA is offline ClassA  Taiwan
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Thanks. I have replaced all old caps and broken diodes on the power supply board but nothing changes. What is the most possible parts needs to be checked first on the servo board?
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Old 7th December 2017, 01:41 PM   #12
lcsaszar is offline lcsaszar  Hungary
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As other also suggested, please measure the power supply voltages. You will need a service manual or at least the circuit diagram. Marantz used to have the good habit of packing the schematic diagram with their appliances, and Philips CD-960 is identical to Marantz CD94.
BTW how did you manage to break those diodes?

Last edited by lcsaszar; 7th December 2017 at 01:44 PM.
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Old 10th December 2017, 02:12 PM   #13
ClassA is offline ClassA  Taiwan
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The diode issue is visible. It was broken into two parts. I just replaced it with a new one.
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Old 10th December 2017, 02:22 PM   #14
ColinA123 is offline ColinA123  United Kingdom
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There is a 960 on Uk E-bay.
Serviced Dec 2017.
Does this mean they tweaked the laser power to get it playing and are looking to move it quickly?
Or am I bitter and twisted?
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Old 11th December 2017, 12:56 PM   #15
ClassA is offline ClassA  Taiwan
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Can anyone tell me what the normal 1K VR setting(?ohm) is for CDM1?
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Old 11th December 2017, 01:13 PM   #16
lcsaszar is offline lcsaszar  Hungary
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The 1k is the laser current setting. It does not need any adjustment. If absolutely necessary, follow the service manual:

Play the test disc
Measure voltage on R309
Adjust VR 3180 for 575 mV +/-75 mV on R309

If you don't have a test disc, better not to touch it.
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Old 12th December 2017, 12:52 PM   #17
ClassA is offline ClassA  Taiwan
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Do you know the typical resistance setting for the 1K VR?
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Old 12th December 2017, 01:36 PM   #18
Mooly is offline Mooly  United Kingdom
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Philips CD960 problems
There is no typical setting, it depends solely on the optical output of the laser diode and the current needed to produce that level of intensity.
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Old 13th December 2017, 01:32 PM   #19
ClassA is offline ClassA  Taiwan
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What will the 1K VR resistance be for a new CDM1?
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Old 13th December 2017, 01:35 PM   #20
Mooly is offline Mooly  United Kingdom
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Philips CD960 problems
You are really not understanding the issue here.

A new laser diode has a very wide tolerance on the current required to produce a given optical output and this means the correct current could be anywhere from say 45 to 65 milliamps as an example. That might be a range of 300 to 600 ohms on the preset.

It is not possible to give a typical figure simply because there isn't one.
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