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Old 20th March 2004, 01:31 PM   #1
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Default Philips CDP reading fix...

Hello guys,

One of my Philips CDP (CDM4/19) has some trouble in reading. No problem in finding TOC and no problem in reading beginng tracks. However it does have trouble in reading some very ending tracks (most exterior tracks).. .

At first, I assumed to be the problem of laser diode, but I don't think the laser diode will be a problem later on. I did found that the optic head move fast and knock the center of spin motor when power switch on without putting any disk. The optic head should be in about center of swing path but it move to end of spin motor side.

What is the problem? TDA8808? SAA7210 faulty? Anyone has the same experience in fixing this problem.

Many thanks in advance.
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Old 20th March 2004, 04:34 PM   #2
Netlist is offline Netlist  Belgium
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What's the model number?
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Old 20th March 2004, 05:05 PM   #3
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CD582

Well, I should say that the "knock" means the optic head move toward the spin motor and stay in there.
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Old 20th March 2004, 11:16 PM   #4
Netlist is offline Netlist  Belgium
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You could start looking for bad solder joints at the TDA8808 and the TDA8809.
Check the PCB connectors as well for bad solderings.
Check/replace transistor 6544 too.
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Old 21st March 2004, 01:26 AM   #5
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Thanks Netlist,

I will check solder joints again (I had done once).

You may be right about some defeated transistor. But "6544" seems to be the transistors dealing kill singal (6542,6543,6544 group) ??

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Old 21st March 2004, 07:45 AM   #6
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Drop me a mail
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Old 21st March 2004, 08:32 AM   #7
joensd is offline joensd  Germany
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I had the same problem and it was of mechanical kind.
The cog wheel that moves the laser unit had some dirt under the lubricating grease.
The dust sometimes forms little hard balls together with the grease which might sit between the cogs.
(I bought a new CD player in the meantime finding that fault;-))

If yours look dusty IŽd remove the grease from the wheel and the corresponding counterpart completely and put some new on.
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