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Have Kenwood CD UD-405 not used for many years. Will not now play CDs or sometimes a few tracks then cuts out stating *NO DISC". Seems fine electronically. Tried switched on for several days to remove condensation in lens system as recommended in user manual, but no effect.

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Seemed to have solved problem by using lens cleaning disc. Had no effect at first but kept trying it and eventually started working. Many cut outs but kept repeating and eventually played without cut outs.

Posted on Sep 09, 2008

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Philips mcm9 system won't read any cds. It says "reading" but nothing else happens and even says that when there is no cd in slot, radio & tape are both working and cd player was working...


In most cases when the CD does not play it is possible that the optical head is a suspect. Sometimes it might pick up ordinary audio CD but will not play other formats. This indicates that the optical head is weak and so there is no detection or scanning of the CD . If the optical is working the tracks will be read immediately but with no scanning the laser head can be defective.

If the no disc comes even without a disc in the player you must check and see if there is a mechanical fault specially in the loading section that seems to trigger the CD mode to work.

Also check to see the main motor as it will not work in some cases as unless the tracks are read the drive motor will not work with signal from the processor. Also in some cases the central motor base can shift and so the distance to the disc can be more resulting in low detection. You can pull up the spindle to come closer.
Sometimes certain cleaner disks will not be tracked to run for cleaning as it will not be read and so will reject. Hence it is ideal to manually clean the laser head eye using a cleaning swap /cotton bud with gentle pressure on the lens eye.
If there is no result then watch if the CD spins or tries to spin. If so the board seems to work unless a test is taken on the main board but the possibility of a defective optical head can be the suspected fault.
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Which unit cuts off? Signal Cables won't make either do that. Either will run just fine even without them.

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http://www.repairfaq.org/sam/cdfaq.htm

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Sometimes certain cleaner disks will not be tracked to run for cleaning as it will not be read and so will reject. Hence it is ideal to manually clean the laser head eye using a cleaning swap /cotton bud with gentle pressure on the lens eye.
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