Denon AVR1906 Repair - diyAudio
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Old 30th April 2013, 02:35 PM   #1
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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 05:44 PM.
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Old 30th April 2013, 03:40 PM   #2
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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.
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Old 30th April 2013, 11:34 PM   #3
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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.
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