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rupert handford rupert handford is offline
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Default Denon UD-M31 CD Problem

On Monday, 13 June 2016 19:38:25 UTC+1, Gareth Magennis wrote:
"rupert handford" wrote in message
...

Calling all CD repair experts!
This is my first in depth CD repair and I have the following questions:
I have the above unit, that won't play CD's. I have replaced the laser mech
and still have the same fault.
The CD will 'twitch' but not run up to speed.
Using service mode I am monitoring the output from pin 62 IC802 and it never
seems to go low (thus powering the laser).
Clock, data, CS and all Vcc lines are correct and the chip is being told to
turn on from the processor.
I have also checked the operation of TR806.
Has anyone had experience of these IC's failing or is there another possible
cause?
Please let me know if I have missed anything!
Regards,
Rupert




Where did you get the mech from and how much did you pay for it?

I've bought many lasers from ebay that just don't work. That's why they
are so cheap and on Ebay.



Gareth.


Hi Gareth,
The motor was from ebay but from a supplier that I have used before and not had any problems with. What are the chances of replacing a unit and having exactly the same fault as the origional? Thanks for the idea though I am not ruleing anything out at the moment!