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Denon UD-M31 - just replaced the laser and wire strip - still won't play...any ideas ?

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: Denon UD M31 CD not playing

It is possible that the laser has gone, the part you require is:

Sanyo SF-P101N CD Mechanism - 16 pins (there are 15 pin versions available which have the same product number, the two versions are incompatible)

i have found the part on Ebay (UK) for less than £5, the shop that sells it also suggest replacing the flexible strip that connects that mechanism to the circuit board, the strip costs £2 and replacing it would seem to be a very sensible idea seeing as you have to completely strip the unit to replace the mechanism.

My UD-M31 is in bits on my work bench at present, awaiting the arrival of a new mechanism, i'll post again if replacing it solves the problem.


Posted on Jan 26, 2009

  • 1 Answer

SOURCE: setting the clock on a Denon UD-M30 CD-R

1. press the menu/set button on component to select display mode
2. use the +/- button to set the time mode (AM 12:00 blinks)
3. press the menu/set button for at least 2 seconds (the hour will start blinking)
4. Use the +/- button to set the hour, must roll the hour to change am/pm
5. press the menu/set button to switch to minutes
6. use the +/- button to set minutes
7. press the menu/set button to finish setting the time

Posted on Jan 28, 2009

Grubhead
  • 5017 Answers

SOURCE: CD JUMPING

Try looking into the lens (power off) with a magnifying glass. If you see any damage you will need to replace the lazer/lens section as the lens will never be able to read the disc.
If it's clear it's more likely to be an electronic fault.

Posted on Aug 28, 2009

  • 1121 Answers

SOURCE: Denon CD receiver - Auxiliary function not working

this is front headfones nearby cd player control knob

Posted on Nov 22, 2009

techman007
  • 1112 Answers

SOURCE: DENON UD-M30 CD Player is

HI:
Usually when a receiver goes into protect mode, there are several reasons, One is there is a bad speaker connected to the unit, this will cause the unit to to into protect mode, try disconnecting all speaker from the unit and turning it on if it does not go into protect then one of the speakers are bad. Another reason is the power output Amplifier IC is shorted inside the unit. Another reasons could be that speaker wires are touching each other and causing a short. Disconnect all unit connecting to the unit and try turning on, if it stays on and no protect then connect them including the speakers one at time until you determine which is causing the error. If it goes into protect with nothing but the unit on then the Output IC is bad and the unit needs servicing.

Posted on Mar 10, 2011

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Try looking into the lens (power off) with a magnifying glass. If you see any damage you will need to replace the lazer/lens section as the lens will never be able to read the disc.
If it's clear it's more likely to be an electronic fault.

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The most likely cause of this problem is the laser is becoming weak. You may be able to get a bit more service out of it by manually cleaning the laser with a cotten bud and some alcohol. However the only real solution is to replace the laser assembly.

It depends on how good at taking things apart and putting them back together you are, weather you should try this yourself. The laser assemblies often have the part number on the side of them, if not you will need to contact Denon who may tell you what it is if you are lucky.

Almost all laser assemblies come fully clibrated and all you need to do is remove the old one and replace it with a new one. You can get the parts from CPC in the UK unfortunately I don't know about other countries.

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It is possible that the laser has gone, the part you require is:

Sanyo SF-P101N CD Mechanism - 16 pins (there are 15 pin versions available which have the same product number, the two versions are incompatible)

i have found the part on Ebay (UK) for less than £5, the shop that sells it also suggest replacing the flexible strip that connects that mechanism to the circuit board, the strip costs £2 and replacing it would seem to be a very sensible idea seeing as you have to completely strip the unit to replace the mechanism.

My UD-M31 is in bits on my work bench at present, awaiting the arrival of a new mechanism, i'll post again if replacing it solves the problem.


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