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Adcom 555 amp left channel stopped working

Left channel stopped working. havent checked fuse as dont know where they are. have not touched chassis

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  • Rocky Degelman Oct 27, 2012

    I have  Adcom GFA 5300 Power Amp There are 2 fuses on the back panenel of it. Plus 6  more inside of the amp on the circut boards, You have to take the cover off. At one time i had 2 of them that i bought from a guy last fall, One of them one channel was not working, But on belively ,I got it working again buy droping it from about 10" up of the work bench 3 times back on to the top of the work bench, This is no word of a lye, Or sometimes they will start working again buy hitting them on the top of the cover or evan the sides of it fairly hard with your fist, It is a trick old techs will do be fore they take the cover off to test them. I was a tech for over 35 years, End decided to retire this summer.But it is a good idea to replace all the fuses on them.Some times they look good but you pop it out,End you will find out the metal end cap is loose on them end pulls right off. I put all new fuse,s in both of them. It cost me around $9 for all the fuse,s for both of them. Hope this helps you out,

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6 Suggested Answers

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Posted on Jan 02, 2017

mjap
  • 107 Answers

SOURCE: Adcom GFA 7000

your output transistor, IC( integrated circuit), tubes. around the output side of the amplifier.

try to switch on the amplifier without the speakers. also the wire connecting the speakers, if the fuse blow without the speakers its inside your ampilfier. if not its your speaker. hope I helped you with this. don't hesitate to reply. ^.^

Posted on Jan 24, 2008

  • 31 Answers

SOURCE: drop out of left channel, Adcom GFA5802

It sounds as if there is a broken solder joint somewhere that slowly opens up with heat. The other possibility is that an input or driver transistor is dying. Since the whole channel is dying, I would guess the broken joint and/or dying transistor are near the very input of the channel.
A tech can very easily find the spot by playing the amp until it starts to die, then spraying small bursts of freeze spray, one component or area at a time, until the amp suddenly comes back to life.
 

Posted on Sep 26, 2008

  • 4234 Answers

SOURCE: how to bridge GPA 555 adcom amp from 8 om to 4 om

First of all, when bridging an anp, the impenence that it can handle usually goes UP not down. I don't believe that the GPA555 can be bridged without circuit modification.

Dan

Posted on Feb 11, 2009

  • 1 Answer

SOURCE: Adcom GFA 555

Lakes Electronics, Inc.
5245 N. University Dr.
Lauderhill, FL 33351
United States
954-749-6100

These guys are listed as one of the 2 Adcom service centers in FL and should be your best bet.
Also Jason Schatten @ Electronic labs might be able to help. Electronic Laboratory, Inc.
1301 West Copans Road, A4
Pompano Beach, Florida 33064
Phone: (954) 969-2855
Fax: (954) 969-2879
Email: Jason@ElectronicLaboratory.com


Hope this helps. Parag

Posted on May 10, 2009

Grubhead
  • 5017 Answers

SOURCE: adcom gfa 555 blows the 10 amp fuse and the 6 amp

Any fuse blowing is caused by a shorted component in either the power supply section or main audio amp part. Follow the fuse circuit and see where it leads you. Look around for burnt of damaged parts. Suspect anything sitting on a heat sink. The most common culprit is the audio amp main transistors, especially if someone shorted the speaker leads together. In the power part it could be the transformer, the large Electrolytic capacitors, rectifier, or voltage regulator. Some amps use an IC for amplification and this can blow the fuse.

Posted on Oct 19, 2009

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1 Answer

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.

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THE AMP HAS 4 FUSES INSIDE, 2 PER CHANNEL. YOU NEED TO CHECK THESE FUSES. BE CAREFULL, HIGH VOLTAGE- UNPLUG POWER CORD AND LET THE AMP STAY FOR COUPLE HOURS. REPLACE ONLY WITH PROPER VALUE FUSES 5AMP. IF BLOWN AGAIN, NO MORE ATTEMPT TO REPLACE - YOU NEED TO SEND IT TO REPAIR FACILITY LIKE THIS

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Adcom GFA-7607 7 channel brand new, watched one movie!


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On the inside back wall of the 1986 Adcom GFA-555 Stereo Power Amplifier there are four fuses,two for each channel. Would you tell me please, what amp fuse they are and if they are the fast or slo-blow...


Sorry to contact you this way but i've spoken to an older colleague of mine and it appears that before 1992 in the Adcom GFA-555 they were using bipolar transistors and the amp was rated fo a minimal impedance of 4 ohms - not like in the newer ones that have MOSFETs and are rated for 1 ohm in bridge mode. So the fast fuses that you need are of 6 amps , not 20 like in the newer models.
Sorry for my mistake.

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1 Answer

My adcom gfa 555 produces out of only one channel now


Swap the RCA's on the back left to right and right to left. If the same speaker is not playing, the problem is in the amp. If the problem migrates to the other channel, check your connection at the source and try another source directly hooked up to the amp. If you still have a channel out, pop the top of the amp and check for a channel fuse. some have them some don't. It depends on the generation of the amp, some just use capacitors and transistors which would require a trip to the service center. Great amp! not much on the radar as a troubled piece of electronics!. Also, swap speaker outputs as well to rule out a bad speaker. Hope this helps

Nov 20, 2009 | Car Audio & Video

1 Answer

Adcom gfa 555 blows the 10 amp fuse and the 6 amp fuse on the far right


Any fuse blowing is caused by a shorted component in either the power supply section or main audio amp part. Follow the fuse circuit and see where it leads you. Look around for burnt of damaged parts. Suspect anything sitting on a heat sink. The most common culprit is the audio amp main transistors, especially if someone shorted the speaker leads together. In the power part it could be the transformer, the large Electrolytic capacitors, rectifier, or voltage regulator. Some amps use an IC for amplification and this can blow the fuse.

Oct 19, 2009 | Adcom GFA-5500 2-Channel Amplifier

1 Answer

How to bridge GPA 555 adcom amp from 8 om to 4 om


First of all, when bridging an anp, the impenence that it can handle usually goes UP not down. I don't believe that the GPA555 can be bridged without circuit modification.

Dan

Feb 11, 2009 | Adcom GFA-5400 2-Channel Amplifier

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