Question about Nu Mark Numark Cdn36 Dual CD Player CD Player

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Cdn 88 not reading cd

I have a next to new cdn 88, all of a sudden the mixer stop reading the cd's, I've took it to a couple of shops but no one is willing to work on it, has anyone had this problem? is there a fix or something I'm not doing? all the lights turn on it try's to read the cd then says NO DISC??????

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Hi, the main board will issue this (no disc) error code when the lens assembly is malfunctioning. this assembly incorporates the lens head and body and tracking rail. this rail has a motor and gear assembly that has to work in unison in order to track and read properly. the (no disc) error is signaling ga serious malfunction within this assembly. it is not tracking. this will cause errors and the lens will not be able to scan for data to transfer to the main board for track display and info.

numark does all the repairs in house so, you will have to send this unit to numark for the lens assembly replacement. it has failed.

Posted on May 22, 2009

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I have a numark cdn 90 one side stop reading the disc but what is strange it not saying no disc and the door opening and closing i did change the whole cd mechanism brand new original from numark same problem could someone help

Posted on Sep 05, 2011

  • Service4you Feb 06, 2012

    I have changed the mechanism, bit I still have the same problem! I have heard that this has to do With and error on the logic board , in My case the left, bit i do not know if this are sold as spare once? Does anyone know?

  • Joseph Bobb
    Joseph Bobb Feb 06, 2012

    my problem with the cd not reading is now fixed it was not the lens was the pcb board had was to change work great now


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As an electronics technician for 15 years, and kenwood,rotel,hafler,arcam,and more warranty service,here is my advice.....1). when a disc is loaded ,the clamper assembly loads the disc on to a motor that spins at 600rpm in the center,and 250rpm on the outside ,as it is a larger circle.and a laser and a photo pick up reads small pits in the oxide coating of the cd.
if the motor does not spin fast enough,the "eye pattern" created by the laser is not readable and the cpu will say no disc.
2)if the laser,mounted on an assembly which is driven by either a belt,gear,or electromagnetic slide mechanism does not dock in the center,it will not read the lead-in data on the disc and say no disc.

3)if the laser diode pick up has damaged suspension components ,or the laser is burnt out,it will say no disc.
there is a eye pattern test point viewable with an oscilloscope,if the eye is absent,the laser is burnt out more than likely.. but there are other causes,such as 4) poor grounding that philips had an issue with,......try putting the unit on top of a metal surface,and away from another components like putting it on top of a digital reciever. the digital tuner signals can actually get into the cd and cause a malfunction if the cd has a plastic bottom...there are other issues,and you may want to ship it back to the manufacturer to look at. hopefully i was of some help.

Posted on Jul 22, 2009

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