Question about Fender Music
SOURCE: FM 65R plays and sounds
Also the volume will probably be lower going into the line level PA input... If the amp is shutting down for thermal reasons, driving it less might not get to the point of shutdown. The schematic shows a temp sensor that reduces and shuts down the amp if the heatsinks get to hot. Possibly you are driving the amp harder than it is intended, If it is as loud (I doubt it) driving the PA input, then I would expect it to shutdown, but you would probably have to drive it harder than your guitar because guitar levels are well below line level. The amp claims 65 watts... don't believe everything you read in spec sheets... You should be able to generate 100 Db of sound with it... The more distortion you use will drive the amp harder and heat the heatsinks faster.
Posted on May 13, 2011
More than likely a bad solder joint. Where is the next question. How confident are you with voltage measurments? The rails in tube amps are high and can kill you so if you are not inclined to do so please don't. The reason I suspect a solder joint is that it is a failure over time, cold solder joints expand and contract with heat. When they heat up they break connection. Not saying 100% that is your problem but it is very likley.
Posted on Dec 14, 2009
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SOURCE: I own a Peavey XR696F
check any and all filter,cross-over,and de-coupling capacitors in every circuit especially on the left channel side,but check all capacitors anyway on both channels,as one channel can affect both left and right channels, also a capacitor can heal itself over time and do the same thing again later,"Cold-Solder" joints can do this also, on a printed-circuit board, HINT:heat and cold can cause problems so,try heating, joints,caps,etc. or buy a can of freeze mist(to cool components) at an electronic parts store and gently heat or cool each suspect component waiting for the outcome,or wait till the condition starts and then try the cooling,because the component has already been thermally warmed up by the circuitry power
Posted on Jan 31, 2011
I want you to do a test. while using the amp plug a pair of headphones into the preamp out... note you will only hear stuff on one side if they are stereo phones and the sound may be fairly weak... while the unit is operating correctely then unplug phones and use it. When it fades out plug in phones compare the level when it was OK... If the preamp output fades lower as well, then we know problem is in the preamp section...
We can do a lot of troubleshooting without opening the amp.
I see nothing in the scheamtics that should be an issue causing this...
Since it didn't fail for the tech, think "what was different?". Are you connecting something else? Foot pedal? Temperature? :Loudness of playing?
Now what else is in common to these two units... AHA! The guitar...
If your guitar has a battery in it, the 20 to 30 minutes fading would correspond to a battery failing and then recovering after you unplug the guitar for a while.
Posted on Apr 24, 2010
As voltages drop, electronics gets unstable as it goes down and becomes noisy... this may be the nature of this beast. Opening the standby might be the best way to avoid the problem.. Here is your schematic for service:
Scroll down to "get manual" and click to download. IGNORE other download links.
Opening the standby switch turns off power to the main amp so noise generated in the preamp will not be amplified.
Posted on Jul 25, 2011
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