Denon AVR1906 Repair - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Solid State Talk all about solid state amplification.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Thread Tools Search this Thread
Old 30th April 2013, 01:35 PM   #1
diyAudio Member
Join Date: Nov 2012
Default Denon AVR1906 Repair

I picked up a Denon AVR1906 today, and it's suffering from the old flashing red Standby problem. I've opened it up and checked all the voltage regulators (7805, 7815, 7915, etc) and they all seem to be okay apart from the 7815 which is reading 14.8V (I'm guessing that's still within tolerances...)

However, on the main PCB there were a few blown components in the S/L channel; capacitor C182, and the Zener diodes on the underside of the board which had literally melted off. I've removed said components, but the unit still refuses to come out of protect.

Now, I'm planning on using this primarily as a stereo amp, possibly with rears at a later date... I've got no real use for the surround channels, so is there any chance of getting the unit working again WITHOUT repairing that channel? The two little diodes are surface-mount, so if I can get it going without having to replace them, that'd be perfect really.

EDIT: C182 and the associated R184 were both faulty, as it turns out, but appear not to be part of the S/L channel (despite being right next to their connector) but instead appear to be connected between the FL power transistor and -B (unsure what this is) connector.

Last edited by michaelcullendesign; 30th April 2013 at 04:44 PM.
  Reply With Quote
Old 30th April 2013, 02:40 PM   #2
diyAudio Member
Join Date: Nov 2012
Just a few more clarifications; one of the power transistors on the S/L channel was shorted to ground, so I've now de-soldered all three of them from that channel.

The amp STILL won't come out of standby; this is with no speakers connected whatsoever.
  Reply With Quote
Old 30th April 2013, 10:34 PM   #3
diyAudio Member
Join Date: Nov 2012
Here's the schematic for the main amplifier and power board, in case that helps

I'm starting to think that regardless of what I do to the S/L channel, this thing isn't going to power up until C182 and R184 are replaced... does that sound right?

Click the image to open in full size.
  Reply With Quote


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
denon to repair or to trash rubli Solid State 4 20th January 2014 02:10 PM
Denon AVR-600 repair leko916 Analog Line Level 0 11th May 2008 06:43 AM
Denon DCC9770 schematics or repair guidance bruneti Car Audio 7 16th October 2007 11:34 PM
Denon PMA-720 for repair ratep2001 Solid State 0 4th May 2006 07:02 AM
denon dp-47f repair jaudio Analogue Source 10 19th October 2005 12:18 PM

New To Site? Need Help?

All times are GMT. The time now is 04:27 AM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2