Question about Adcom GFP-710 2-Channel Amplifier
I have a problem with the Main Output only, were the left speaker drops out. If I increase the volume it will come back on again, but it usualy drops out again after an intermittant time period. I tmay work for two days without a problem at a time. There is no problem with the Bypass Output.
Hi am gathering that when it is bypassed (tone) its fine which suggests that the problem is on the treble/bass pots or boards. Try cleaning all the pots with switch cleaner first (open the amp and spray it into the pots them selves through little holes). If not there then Check for a loose wire, and can also tap the boards with back of screwdriver while the amp is playing to listen for dry joints (loose solder and CAUTION for getting a shock also!!)
Pretty sure though on the pots or dry joints.
Best of luck
Posted on Jul 25, 2009
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Posted on Jan 02, 2017
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There is a good chance that a common control may have developed a high-resistance or 'dead' spot through idleness and is causing your symptom. Turn the POWER OFF and operate every control throughout its range a number of times, especially rarely-used ones like Tape Monitors and the Mute control.
Turn the volume to something reasonable and see if that helped.
Lots of ways to eliminate sources of the fault and isolate the problem.
Mar 12, 2011 | Audio Players & Recorders
Generally speaking, an amp protects itself from heat, shorts and overloads by refusing to turn on or stay on.
Overloads can be from excessive periods of high output and shorts would be wiring issues or a speaker blowing up.
You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.
If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.
If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'naked'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced hands-on tech.
Check for loose speaker connections as a root cause for intermittent shutdown.
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