Denon DVD2900 Power Supply Fix - diyAudio
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Old 11th November 2013, 04:32 PM   #1
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Join Date: Oct 2002
Location: UK
Default Denon DVD2900 Power Supply Fix? Sadly Not!

Possibly, anyway!!

I have heard the DVD2900 PSU is flakey. My uint (which fortunately I did not sell having recently advertised it!) has just decided to "NO PLAY" a couple of CDs. Hmmm.

I removed the PSU board (nice and easy) and had a look. There appeared to be evidence of a hotspot around D906.

Detective hat on!

The Hifi Engine have the DVD2900 Service (and user) manuals. You'll need to register to get them.

D906 is a SNUBBER diode. Part is SARS01T and the datasheet is here:

http://www.semicon.sanken-ele.co.jp/...RS01_ds_en.pdf

The implementation on the datasheet is exactly as per the DVD2900.

However...

The datasheet clearly shows the snubber diode mounted OFF the board. This was not the case in the DVD2900 PSU that I have - the diode was hard against the PCB. Naughty Denon!

I've remounted the snubber so there is some airspace now. I'll get it into the system and report back. Hopefully, this will be a cure for some DVD2900 problems!

Jon

Thanks to HiFi Engine - great resource!
Attached Images
File Type: jpg SARS01 D906 DVD2900.jpg (57.4 KB, 23 views)
File Type: jpg SARS01 data.jpg (87.9 KB, 22 views)
File Type: jpg SARS01 mounting.jpg (46.3 KB, 21 views)
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Last edited by jonclancy; 11th November 2013 at 08:49 PM.
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Old 11th November 2013, 09:00 PM   #2
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Rats!! The problem is still there. Probably a dodgy drive, then.

Trouble with this unit is that it runs warm - more so that I'd expect for such a bit of kit. That's probably upsetting the laser.

I'm using it as a transport only. Might look at a replacement laser, but before that, I'll give the lens a clean with distilled water. A replacement laser is 15 on eBay, so not too bad.
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Old 11th November 2013, 11:15 PM   #3
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increase the laser output a notch or 2. turn the little trim-pot (located on the laser pick-up) clockwise half a degree...

Boky
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Old 11th November 2013, 11:21 PM   #4
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Thanks - I'll give that a try. I was going to replace the laser anyway, so nothing to lose.

Though I will try a little clean first!
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Old 12th November 2013, 10:06 PM   #5
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Cleaning didn't help. I'll have a look for the trimpot next. A new laser isn't expensive. Last resort...
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