20 Most Recent Adcom GFA-7500 5-Channel Amplifier - Page 2 Questions & Answers

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.

No Power means no supply. Step by step troubleshooting is recommended. Start with the main source power,then the cable wires,then to the primary section of the circuit board.Some components may be busted already.

It sounds as though a remote control button is stuck or perhaps one of the remote control sensors within the unit itself. I would imagine this piece of equipment to be well worth repairing and likely the most cost effective avenue as well.

check the fan, (its cooling system) clean it using a blower... hope this wil work.

First off see if moving the amp causes the condition to happen. If it does suspect bad soldering. If it doesn't then you might have got a heat sensetive part. This wil be either a transitor or IC etc. See if anything connected to the preamp is getting hot. You can also spray Servisol Freezer Spray on the parts you suspec, whilst the unit is working. Wait while it goes off and spray one part a time. If it comes back on when the part is sprayed, replace that part.

I should check inside for fuses or damaged parts.

Basing on 50 wpc could be about 28Vac ( about 48Vdc ) @ 6A minBut check voltage rating of capacitor , if it is 71V then 34V ac is possibleonly for the main ampNote: 34Vac is for 150w may not be applicable to the unit , unlessyour modding the circuit.

first you break input signal from amplifier and boost up volume and see noise coming or not if not means u have preampfire section problem

What? These things in the first picture? ...

http://www.audiokarma.org/forums/showthread.php?t=110308

They're common...

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I have a GRC 815 remote for sale : [email protected] email me, me can work it out

this is a neutral wire - there should be a grounding bar. Look for an empty terminal.

THanks!