Denon DCD-2560 will not read disc... - diyAudio
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Old 5th January 2007, 10:33 PM   #1
Cobra2 is offline Cobra2  Norway
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Default Denon DCD-2560 will not read disc...

Please help, I'm trying to get this Denon player up running.

I have the servicemanual, but it does give me any good clue where to look for problems.

The laser is new, and measures ok on current-consumption.
It accepts a CD, starts, but will not read.
And before I can get it reading, I cant do the other adjustments.
I have tried different settings, without any improvement.
Eye-pattern looks useless, but sometimes,(a second at a time) there is a decent pattern showing. Most of the time it only shows this...(picture).
Faulty chip?

Arne K
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Old 5th January 2007, 10:52 PM   #2
anatech is offline anatech  Canada
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Hi Arne,
0.2 uS/ div ? Try 0.5 uS / div for a better display. You can lower the amplitude as well.

That display is normal in the TOC area. This machine has a service mode. Read the manual and use it.

I would suspect that either the adjustments are completely wrong or the disc motor has some issues.

These are great machines when running.

-Chris
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Old 5th January 2007, 11:13 PM   #3
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Maybe the Denon is illiterate.
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Old 5th January 2007, 11:51 PM   #4
Cobra2 is offline Cobra2  Norway
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Service-mode is just for checking simple commands & focus. Not any "run all" function...

Disc-motor seems fine, running / pulling strong.

I will check more tomorrow...

Arne K

BTW, comparing a KSS-151A & AD1862 machine, my VRDS-25 is a way better machine...
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Old 6th January 2007, 01:31 AM   #5
anatech is offline anatech  Canada
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Hi Arne,
Did Teac and Tascam under warranty too. I will not comment further.

The test modes should allow you to engage one servo at a time so you can tell where the problem is. You can also advance the laser assy to a data area to look at the waveform.

The later models also have a "heat run mode", this allows you to hot test an intermittent unit. When a failure occurs it will list a failure code.

It would be nice if more manufacturers installed programs like this. Is it possible there is a problem with the linear resistor that is used to determine head position?

-Chris
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Old 6th January 2007, 11:11 PM   #6
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Hi Arne,

What's the peak-to-peak amplitude value of that eye-pattern, and with what type of disk in the drawer?

Boky
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Old 7th January 2007, 01:13 AM   #7
anatech is offline anatech  Canada
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Hi Arne,
Quote:
Disc-motor seems fine, running / pulling strong.
Excessive bearing wear or dead spot in a disc motor may seem fine unless you really look for it.

Now that I think of it, I believe the "H" dampers got rock hard after a few years. They will cause the machine to be very sensitive to external vibration. Replace those and your machine will be much better.

-Chris
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Old 7th January 2007, 09:08 AM   #8
Cobra2 is offline Cobra2  Norway
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Default still trying...

Disk-motor bearings seems tight, motor runs / pulls strong in both directions(!)(when mis-adjusted). Slead slides beautiful off power, pulls in nicely when powered, coils measure ok. Focus works ok.
All chip input voltages ok. It starts up, reading TOC, but does not react to it. Will not start (just focus) without disc.
Suspension is still intact.

(scoope was set to 0,2V/div - 200nS(0,2uS), using a "Burosch Laser CD test-disc. Dire Straits made no difference. Maybe I should try Rammstein).

Arne K
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Old 7th January 2007, 10:04 AM   #9
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Hi Arne,

Your eye-pattern is only 1.1V (measured at "RF test point" - yes?) - it is too low - it should be around 1.7V peak-to-peak (I am assuming here that the Vcc of the RF chip is +5V, which is the case I think, if my memory is still serving me ok). I am familiar with that test disk as well. If you are going to use this particular test disk (which has very high reflectivity!), you can adjust the eye-pattern level to around 1.8-1.9V pp. This will give you good playability of very low-reflection disks.

As I understand, you have a brand new laser installed. Yes? If this is the case, laser "output" should be adjusted to work properly in your CD player. Sometimes they come well adjusted, sometimes they don't. From your previous post I see that you are quite good with electronics, so I'll only go as far as suggesting to do 10 degrees clockwise increments on the laser pickup pot, at the time, until you reach 1.8-1.9V pp.

The above should work fine and you'll be able to read reliably all disks.

Good luck let us know the outcome,

Boky
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Old 7th January 2007, 10:44 AM   #10
Cobra2 is offline Cobra2  Norway
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I will try to measure again, and take another pic. Pattern was taken from chip-pin...(test-point).

Laser is new. There are no laser-adjustment(other than on laser itself), but a testpoint for current, wich is 0,02mA over stamped value...(= correct+/- measuring error).

RF chip has +5,023V

Need a break, and a new box of patience

Arne K
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