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Old 13th December 2012, 03:36 PM   #21
nuryev is offline nuryev  Australia
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Default tests

Still trying the 5mz velleman - not much luck.
Player still spinning with intermittent no sound after playing for a short while.

I made an interesting discovery though, gently tapped the plastic housing around the laser and it started playing again! Still listening and waiting for the fault to surface again to check if the problem may be a laser alignment issue. Or am i totally off the mark??
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Old 13th December 2012, 06:41 PM   #22
Mooly is offline Mooly  United Kingdom
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Theres nothing alignment wise you can do to the CDM12 pickups. Problems are either mechanical such as sticking or faulty laser/optics. Looking at the RF tells a lot though.

It should look as good as this and be around 1.5 volts peak to peak,
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Thats a real picture from a scope and its absolutely exactly how it would be on any player.

If you can tap it then it may be mechanical. Another test is solder a couple of fine wires across the small sled motor that drives the pickup and monitor the DC voltage in play. It should be minimal as the sled inches forward. If the voltage suddenly starts to rise then that indicates the sled has "stuck" and the voltage builds trying to overcome the friction. If it does overcome the friction the sled jerks forward and the voltage falls again.
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Old 13th December 2012, 09:08 PM   #23
JZatopa is offline JZatopa  United States
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The transports on these go out regularly, chances are you just need to swap it. It is a pretty simple job.
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Old 13th December 2012, 09:23 PM   #24
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Quote:
Originally Posted by nuryev View Post
It appears that the buttons do both:
1) they do what they should ie fwd, back, pause, stop etc.

but if depressed while the machine is in 'fault mode' ie no sound;
then any of the buttons marked << or >> or pressing pause twice will get the specific track to fwd or backtrack or pause and then play as normal.
I hope that makes sense.
lets see...... you move the lens assembly back and forth by pressing FWD / BCKWRD.... and everything is okay again for a while....

why don't you see what is preventing fine (precise) lens-assembly movement when the CD player is left in play for long times? the focus servo adjust the lens for a "while" (electronically - electromagnets), before the whole lens assembly needs to move "mechanically" forward a lil bit...

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Old 14th December 2012, 10:27 AM   #25
nuryev is offline nuryev  Australia
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I connected wires as per your suggestion: and monitored the player visually and audio ie dvm and speakers and amp connected.
Start: @6.36pm voltage = 0.53/0.48
6.41 ' = 0.48
6.49 ' = 0.43 still playing to track 5 with audio
6.51 = 0.42
6.55 = 0.38 no audio track 5

Tried a second cd: voltages started at 0.51
0.52
0.38V audio stopped at track 5.
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Old 14th December 2012, 10:30 AM   #26
nuryev is offline nuryev  Australia
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Quote:
Originally Posted by DJNUBZ View Post
The transports on these go out regularly, chances are you just need to swap it. It is a pretty simple job.
I have three Marantz players cd63 67se and cd63KI- have replaced lenses on all of them not. Also tried the swap but it seems that both the KI and cd67 lens don't seem to be work when swapped.
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Old 14th December 2012, 10:34 AM   #27
nuryev is offline nuryev  Australia
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Quote:
Originally Posted by Extreme_Boky View Post
lets see...... you move the lens assembly back and forth by pressing FWD / BCKWRD.... and everything is okay again for a while....

why don't you see what is preventing fine (precise) lens-assembly movement when the CD player is left in play for long times? the focus servo adjust the lens for a "while" (electronically - electromagnets), before the whole lens assembly needs to move "mechanically" forward a lil bit...

Boky
I have taken the entire mechanism out of the player, removed the ribbon cables and pcb and inspected with magnifying glass - cleaned and greased rails (very ightly) and gears - but could not see any visible obstruction or misalignment that could interfere with precise lense movement. While writing this response the player has stopped and started (on it's own) at least three times -voltage across motor has dropped to 0.35v
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Old 14th December 2012, 10:39 AM   #28
Mooly is offline Mooly  United Kingdom
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Those voltages sound OK. If the sled physically sticks the voltage goes up and up.

So back to square one. If you can't get the RF signal to look like it does in the link posted earlier (and for whatever reason that might be... scope ? I don't know) then its difficult to suggest anything else to check really. That signal is so very important to check and evaluate.
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Old 14th December 2012, 10:46 AM   #29
Mooly is offline Mooly  United Kingdom
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Quote:
Originally Posted by Extreme_Boky View Post
lets see...... you move the lens assembly back and forth by pressing FWD / BCKWRD.... and everything is okay again for a while....

why don't you see what is preventing fine (precise) lens-assembly movement when the CD player is left in play for long times? the focus servo adjust the lens for a "while" (electronically - electromagnets), before the whole lens assembly needs to move "mechanically" forward a lil bit...

Boky
When the laser is "on track" the tracking error from the photodiode array is zero. As the lens moves outward (driven by the tracking coils that move the lens left and right) then this error signal gradually increases. When the error reaches a predetermined level the sled motor has enough voltage such that it rotates a fraction. The tracking coil voltage then comes back down again.

From the results of the voltage test and the fact the time counter keeps incrementing, I think the problem lies elsewhere.
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Old 14th December 2012, 10:55 AM   #30
nuryev is offline nuryev  Australia
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Correction and apologies - the voltages recorded above were for the cd drive motor.

The laser motor voltages appear to fluctuate between 0.004v and 0.054v during normal play.
However, as Moolly suspected the voltage jumped to 0.12 and then 0.16v followed by audio cut out.
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