Rotel RA311 Schematic Needed

ahd100 · 21st September 2004, 03:44 PM

Hello,

I'm new to this forum and I'm looking for some help.

I have recently been given a Rotel RA311 amp that is displaying some problems but I don't know where to start as I don't have a schematic to tell me what's going on in there.

It's displaying an audio frequency hum when switched on in all possible modes which I suspect is related to a large sawtooth looking 1MHz component I found when I put a scope on the output.

Any suggestions?

If you can help me find a schematic that would be most helpful.

Thanks very much,

Andrew

metalman · 23rd September 2004, 07:16 PM

I had to contact Rotel directly for the schematics for my RA971MkII integrated. They sold me a service manual containing the schematic and service instructions etc. for US$20.

mogga · 23rd February 2011, 11:30 AM

did you end up getting the schematic?

jaycee · 24th February 2011, 10:50 AM

The 311 is a very old amp. To start with, you should do a complete replacement of all electrolytic capacitors. That in itself might well cure the problem, as oscillation is a sign of dried up decoupling capacitors.

stainless · 24th February 2011, 01:11 PM

Link to services manual.

Service manual, eprom result list | ElektroTanya | Service manuals and repair tips for electronics experts

JohanH · 25th February 2011, 04:45 AM

or

Rotel RA-311 solid state amplifier

Cheers,
Johan

mogga · 26th February 2011, 08:14 AM

Thanks a lot mate

21st September 2004, 03:44 PM	#1
ahd100 diyAudio Member Join Date: Sep 2004 Location: Leeds, England	Rotel RA311 Schematic Needed Hello, I'm new to this forum and I'm looking for some help. I have recently been given a Rotel RA311 amp that is displaying some problems but I don't know where to start as I don't have a schematic to tell me what's going on in there. It's displaying an audio frequency hum when switched on in all possible modes which I suspect is related to a large sawtooth looking 1MHz component I found when I put a scope on the output. Any suggestions? If you can help me find a schematic that would be most helpful. Thanks very much, Andrew

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23rd September 2004, 07:16 PM	#2
metalman diyAudio Member Join Date: Jun 2003 Location: Calgary, Alberta	I had to contact Rotel directly for the schematics for my RA971MkII integrated. They sold me a service manual containing the schematic and service instructions etc. for US$20.

23rd February 2011, 11:30 AM	#3
mogga diyAudio Member Join Date: Feb 2011	did you end up getting the schematic?

24th February 2011, 10:50 AM	#4
jaycee diyAudio Member Join Date: Apr 2004 Location: Norwich, UK	The 311 is a very old amp. To start with, you should do a complete replacement of all electrolytic capacitors. That in itself might well cure the problem, as oscillation is a sign of dried up decoupling capacitors.

24th February 2011, 01:11 PM	#5
stainless diyAudio Member Join Date: Feb 2007 Location: western aust	Link to services manual. Service manual, eprom result list \| ElektroTanya \| Service manuals and repair tips for electronics experts

25th February 2011, 04:45 AM	#6
JohanH diyAudio Member Join Date: Dec 2003 Location: Noord Brabant	or Rotel RA-311 solid state amplifier Cheers, Johan

26th February 2011, 08:14 AM	#7
mogga diyAudio Member Join Date: Feb 2011	Thanks a lot mate

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