CD player skips

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#22
Extreme_Boky said:
Hi klitgt,

I also think you should try fixing this unit yourself and take it as a learning project. No one could teach you and told you exactly what to do to get your CD player going, we can only give some general advises which could be helpful if you have basic understanding how to follow our hints.

I have already mentioned 3-4 times on forums how to check the eye-pattern which will tell you if your laser is due for replacement or not. Find the test point on the PCB labelled RF and check the eye-pattern. You’ll need the CRO for this. If it is to low, increase the laser output by turning the little trim-pot located on the pick-up itself clockwise for 20 degrees at the time. This usually fixes the problem (for another couple of years.)

You should also get the circuit diagram, study for a while the circuitry and have basic understanding on the signal flow in a CD player, servo control, RF, DSP, DAC's (and analog stages with filtering) and power supplies.

If you send us the circuit diagram of the digital section through we might be able to help you even further.

No need to go to service to get job properly done, you can do it yourself!

Good luck,
Extreme_Boky
Click to expand...


I have to scan the diagram and mail it. Be patient, I might need to image-process it because it is more than one A4 page.
 
#23
Denon DCD-3560 and laser

Kligt,

I have been following your threads on Denon and modifications. I am not as good as you are but slowing picking up more information.

I happen to buy 30 laser units for this model which is the expensive KSS-151A. People say it's tricky to replace but seeing the kinds of work you do, this is no more difficult.

I am selling here in the US for $85. Let me know if you are interested. I have 12 Denon cd players and I love all of them, especially the simple DCD-1560 or the heavy tank DCD-3560.

I also need to study the schematics and try to do the the modifications starting with the most obvious ones. I also bought 100 of the OPA627 opamps and replace every cd player with this opamp.

wsjoe
 
#24
This is an old one, I didn't think I've been on here this long. But anyway, a CD player of mine recently started to skip lik this, after sending it to a repare shop, the tech said it's a motor problem that some dust/dirt might have gotton into the motor. The motor itself sounded louder than normal so I think it was the spinning motor he was taling about. Probably the vrbration was large enough to cause the laser to mistract accationally.

The solution, just switch the tray.
 
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