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Denon DCD-920 CD Player. Display lights up with a series of 0"s but disc doesn't play

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I had exactly the same problem with my Denon DCD-910. Fixing it is easy, but it took me a while to find out;

In the power supply +10V and -10V unstabilized lines (in front of the 7805 and 7905 +5V and -5V regulators on the heatsink),

there are 2 ICP-N15 devices (IC protectors: very fast acting electronic fuses 0.6A). PCB component print is IC502 and IC503 if I remenber well. They tend to deteriorate over time and break, or a current peak could have made them tripping.

The +10V/-10V (+13/-13V really) is used for driving the loading/spindle/sliding motors and focus/tracking coils ONLY. +/-5V was still OK, that's why you can still see the display.

They have a TO92 transistor housing, but only 2 leads. ICP-N15 are hard to find; You could also use ICP-F15, but these have a different housing.

You could order the original ICP-N15 at utsource.net
An alternative could be to mount 2 polyswitches (also called multifuse), a PTC type current limiting and recoverable circuit breaker, like Bourns MF-R065, rated 0.65 A

I replaced them with 2 radial 800mA PCB solder mount fuses (1$/pc), and everything works fine again. Yet another piece of excellent equipment not to be thrown away ;-)

You have to unmount the PCB from the CD player housing (about 8 screws and disconnect all 10 connectors) to be able to replace the fuses.
While it is disassembled, check for broken solderings, especially on high power devices ( like voltage regulators mounted on heatsink or power transistors)


I hope it works for you too.


--Vincent

Posted on Nov 22, 2012

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Posted on Jan 02, 2017

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http://www.audiovisualservices.info/



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