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Old 21st September 2004, 03:44 PM   #1
ahd100 is offline ahd100  United Kingdom
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Default 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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Old 23rd September 2004, 07:16 PM   #2
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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.
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Old 23rd February 2011, 11:30 AM   #3
mogga is offline mogga  Australia
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did you end up getting the schematic?
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Old 24th February 2011, 10:50 AM   #4
jaycee is offline jaycee  United Kingdom
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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.
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Old 24th February 2011, 01:11 PM   #5
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Link to services manual.

Service manual, eprom result list | ElektroTanya | Service manuals and repair tips for electronics experts
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Old 25th February 2011, 04:45 AM   #6
JohanH is offline JohanH  Netherlands
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Rotel RA-311 solid state amplifier

Cheers,
Johan
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Old 26th February 2011, 08:14 AM   #7
mogga is offline mogga  Australia
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Thanks a lot mate
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Old 4th January 2014, 03:21 AM   #8
raytoms is offline raytoms  Australia
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Many thanks for this link. I have had my RA-311 since new in 1974. It was retired when I built up my home theatre, but has since been re-instated for audio in another room. Amazingly it works a treat. Slight cap noise for a few seconds on power up, but after that it is perfectly silent and sounds great. The only problem after being in storage is that the Power-On LED doesn't light up. Hence the need for the schematic to check voltage requirements for a new LED.
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