Question about Adcom GTP-870HD 7.1-Channel Amplifier
I am puzzled. i have a adcom gtp-870hd, i love the preamp, but when i run the 7.1 channel, only the front and the back and center will show sound. what is my options? sometimes while playing music at 7.1 all channels play except on side channel or speaker has no sound but the other side of left speaker sounds great, i switched cables then the right speaker has no sound. then i tried to switch the cables from a different, like the main to switch to side and side to the main then no sound of main speakers which are the side speakers but the side as main works great. i need support.. thx just tech just more complicated as future moves foward... thx need help?
Getting the connections right is a problem. One thing I find helps is the THX DVD discs that certain movies have on them. They have a sound set up to get it right. It makes a tone for each channel so you can hear which channel is working. It should help you set up the system right and determine if any channel has a fault on it.
Posted on Mar 11, 2014
As all units made within the last 5 years. or so, use non-leaded solder, you can have cold solder connections(bad solder connections) causing intermittent output from any and all channels. I would seriously doubt any capacitors are bad, as if they were, that channel that is bad, wouldn't come back on. It would stay off until it's fixed. If you need more assistance, or would like to inquire about repairing your unit, please visit my website, audioserviceclinic.com. You may contact me there.
Posted on Dec 13, 2014
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Posted on Jan 02, 2017
Have you tried swapping speakers to see if the trouble moves to the other speaker?
It could be a dirty selector switch .
It could be a broken solder contact on the input or output RCA jacks
Posted on Feb 25, 2009
Try just the power amp on ..nothing connected
no Dakiom thingy either. It's a matter of elimination. Start at the output device and work back. Keep the Dakiom out of the loop.
If there's hum with just the Adcom..then it's the ADCOM
Posted on Mar 25, 2009
SOURCE: ADCOM GFA7500 problem
I don't have experience with the 7500 but I had a 7000 with multiple bad channels (red light lit). The problem was bad filter capacitors on the amplifier boards. The large black filter caps (two per channel) were leaking on every amp board. Its a relatively easy repair if you can solder.
FYI you'll probably need a set of small hex head drivers to open the unit.
Posted on Feb 22, 2009
SOURCE: Adcom GFA 7500 problems
My right channel went out on my GFA 7500 and the problem was TWO blown internal fuses. Each amplifier inside the GFA 7500 has two fuses. In order to get to the fuses you must first take the top of the amplifier off by removing the screws using an allen wrench. Then put the top back on.Turn the amplifier over and remove most of the screws from the bottom to access the fuses in the bottom of the amplifier. There are two different size allen wrenches on the bottom. Be careful to not drop a screw inside the amp and make sure you line up the screw holes that hold the amps using a small screw driver to push the amps into position. I replaced all the fuses on the top and the bottom. AdCom sells the fuses on their site.
Posted on Aug 29, 2012
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Dec 28, 2011 | Adcom GFA-7500 5-Channel Amplifier
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 or marginally low impedance loading by the speakers; 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 and competent hands-on tech.
Check for loose speaker connections as a root cause for intermittent shutdown.
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