Denon RCD M38 repair

This Denon RCD-M38 repair was a long one but I've managed to trim the video down to one hour.

Essentially, I needed a test amplifier for my workshop so bought this cheap of e-bay hoping for an easy fix. It was in a way but complicated by the multiple power supply parts on different boards and the fact you can't really measure volts properly on isolated boards. I got very confused at one point until I realised this, when I reconnected the boards the checks made sense and I located the fault to the audio output IC going short circuit, which in turn had blown the thermal fuse in the mains transformer.

The main parts of the video show disassembly and reassembly as well as me chasing wrong voltages, but I got there in the end.


Please Like and Subscribe to the channel:    / @chaslarge  

You might also like to support me on Patreon: https://www.patreon.com/bePatron?u=43...

MUSIC:
Google Library:
Find Your Way Beat - Nana Kwabena
Can I Tell You a Secret - TrackTribe
Just Do It - RKVC
GRAPHICS & ANIMATIONS:
End: https://pixabay.com/users/tommyvideo-...

SUBSCRIBE BUTTON Pixabay
https://pixabay.com//?utm_source=link...

CONTENT:

00:00 - Introduction
03:25 - First look at the manual
03:59 - Beginning to check voltages
07:13 - Suspecting the main PSU dismantling begins
12:41 - Discovering an unplugged cable - someone else has been here before!!!
14:05 - Reconnecting it made no difference, continue removing the CD
15:00 - Testing continues
17:05 - Suspcting the Mains Transformer
18:00 - Transformer OC Primary confirmed
20:26 - Realising I've been checking the wrong connector DOH!!!
20:50 - Dismantling the sub-boards to take the transformer out
21:58 - Inspecting the transformer
22:19 - We need a new transformer
22:43 - We have a new transformer and I've repaired the old one too!
25:11 - Comparing the transformers
26:32 - Re-examining the circuitry
35:00 - At this point I cut things short as I was going round in circles
36:18 - Audio output chip disconnected, everything else now works
38:34 - Confirmed - new Audio Output chip required
39:06 - We have the new chip, lets fit it
40:29 - Getting the audio output stage out - more tricky than planned
44:35 - Fitting the new chip
46:46 - Soldering - these old eyes are getting tired!
51:21 - Refitting the audio output stage
55:00 - Testing Testting Testing
58:48 - Wrapping up - thanks for watching.