Question about Adcom GFA-5802 2-Channel Amplifier

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ADCOM 5802 ON/OFF SWITCH

Good Morning! My name is Alex Gibber I am looking for an advice on Where can I get a replacement fly-away board for the front panel ON/OFF switch, for ADCOM GFA 5802 power amp? When I was moving, the movers put the amp in a box, and during the move, it pushed the toggle of the front switch in. When I tried to turn it on (without noticing that the switch was damaged), it burned the R104 resister on this board. I think it may be easier to replace this small board that replacing the switch and the burnt resistor. Can you please help me locate this sub-assembly. Many thanks, PEACE, Alex

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Posted on Jan 02, 2017

petraman7
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SOURCE: Looking for a repair or service manual for ADCOM

If you're friendly about it , the folks at ADCOM will probably give you a schematic
Call and talk to tech support

Posted on Dec 01, 2010

  • 12 Answers

SOURCE: Looking for a repair or service manual for ADCOM

i bolive is 158ohm /0.25w metal film 1% but not sure

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Hi my adcom 5802 get right Chanal not working . I don't know why every time I put 2 fuse for that Chanel is burn st thing look like diot ... And after that 2 fuse burn too


If I can read you right you are saying that the device keeps blowing the fuse?

Fuses blow when there is an overload. As it is an amplifier we are dealing with the cause is more than likely a shorted output transistor or more than one, or whatever does the main amplification for the device. These devices are located on the main power amp board attached to a heat sink. If the amp has fuses for each channel then you only need to replace the devices on that channel, with the fuses blowing on it. The cause of shorted devices is often bad speaker wires or them touching.

Nov 21, 2015 | Adcom Audio Players & Recorders

1 Answer

Adcom amp 5802 running hot


It should run hot to touch at idle, about 120F, because it is MOSFET type amplifier.

Mar 23, 2013 | Adcom GFA-5802 2-Channel Amplifier

1 Answer

Humming when no input in jack; works fine with rca inserted; worries me that somethings is not right even though works fine with RCA or XLR plugged in, right channel only


Sounds like it could be feedback hum. Is there anything near it that could cause a reaction when unpluged? Such as a turntable, cassette etc. If so move them and see if it goes away. Even then it won't hurt the amp. I think otherwise worry when there's a hum when they are plugged in. PS check any earth connections too!

Jun 21, 2010 | Adcom GFA-5802 2-Channel Amplifier

2 Answers

Adcom GFA 5500 'mechanical' hum from amplifier


Possibly. Most amps filter out line hum via low-pass filters. If you can locate a schematic, those would be the caps to check.

Apr 24, 2010 | Adcom GFA-5802 2-Channel Amplifier

1 Answer

Hi, my name is allister. i have a problem with


Hi Allister...

Check for fuses and make sure that the speakers are solidly connected at both ends

I can suggest a repair place if needed

Mar 26, 2010 | Adcom GFA-5802 2-Channel Amplifier

1 Answer

I turn on the ADCOM GFA-5802 amplifier... ...The power light comes on, but does not heat up nor output sound


Have it serviced. Do you know what GFA stands for. People at Adcom do have a great sense of humor. Take it only to a high end audio servicer. Contact Adcom. This is good stuff you wouldn't want a hack working on it.

Nov 23, 2009 | Adcom GFA-5802 2-Channel Amplifier

1 Answer

Can you bridge an adcom GFA-5802 power amp?


Running an amp in bridge mode requires a specific circuit design. It is not possible to combine 2 amps in this fashion.
Dan

Mar 02, 2009 | Adcom GFA-5802 2-Channel Amplifier

4 Answers

ADCOM GFA 5802 POWER AMP NO SOUND, BUT POWERS UP.


Remove the output transistors and measure each of the sets of 3 pads and report the voltage readings here. I suspect that you have either a blown driver circuit or output transistors. The voltage readings will give me an idea on where to start looking for specifics.

Thanks,
Dan

Nov 11, 2008 | Adcom GFA-5802 2-Channel Amplifier

1 Answer

Bi-amp


After examining a picture of a 5802 ( I have been servicing adcom for over 20 years ), these are not bi amp posts, but bi wire posts.

Bi-amp means that 2 amps are being used, one for highs, one for lows. This means that you have no crossovers in the speakers, instead, you have an electronic crossover between the amps and the pre-amp. The highs and lows are separated in the electronic crossover. One amp handles the lows, one handles the highs.

Bi-wire means that you have the crossovers still inside the speakers. The amp handles the full range of music ( highs-mids-lows ). Different kinds of speaker wire produce different results. If you have bi-Wire terminals on your speaker, they come with shorting wires, that tie the tweeter + to the woofer + on the back of the speaker, and the tweeter - to the woofer - . When the shorting wires are removed completely, you have now electrically separated the tweeter and woofer from each other, while maintinaing the crossovers ( inside the speaker ) for each.When this is done, you can now bi-wire the speakers and amp, and use different kinds of wire for the lower frequencies and the upper frequencies, depending on your ears ( everyone hears a little differently, thats why there are so may makers of components, and wire ).

Why do we have crossovers?.....the tweeter voice coils ( the things that make the sound ) are made of hair thin wire. This wire cannot handle much power and if you were to put bass in to a tweeter, you would burn the tweeter out almost instantly. A tweeter is a very light, fast moving device which can react very quickly to high frequency sounds ( symbols, triangles, guitar strings....). Woofers are more rugged. They have voice coils made of heavier wire and are designed for larger movements that Bass demands. Subsequently, woofers aren't very good for high frequencies because they are slower devices.

So what do we do ?.....Keep the lows away from the tweter and the highs away from the woofer.....thats the job of the crossover.

In the event that your speaker has the crossover OUTSIDE the speaker box, you should check ( as always ) with the manufacturer of the speaker to see how it can be changed to suit your needs. Remember to always read and follow your owners manual. Good luck....Rob

Feb 22, 2008 | Audio Players & Recorders

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