Gemini GXA 1600 PA Amplifier Repair - diyAudio
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Old 1st October 2015, 12:24 PM   #1
diyAudio Member
Join Date: Oct 2015
Default Gemini GXA 1600 PA Amplifier Repair


Would anyone have an electronic copy of the service manual, including schematic, for the Gemini GXA 1600 amp? I'm currently using the manual for the XPB 750/1600, which is very similar but must be different.

The main issue is a fault with the left channel, which is dead but for its yellow "Protect" LED flickering and the sound of a relay clicking on and off inside the amp. The left-channel LED flickers without any audio input or output connected but the flickers appear to increase in frequency as the left volume control is increased. Perhaps this is of no real significance but including it as it's what I observed. Despite the relay clicking on and off intermittently (less frequent than flickering) the left-speaker channel is completely silent.

I suspect a thermistor may be at fault, but that is just my initial suspicion. The channel failed after switch on with a low volume. It was connected to a single Peavey two-way speaker at the time, I'm told. Hoping none of the OT have failed but not ruling them out. Any experience, hints, tips, problem-pointers with repairing these amps would be appreciated.

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Old 10th October 2015, 12:20 AM   #2
diyAudio Member
Join Date: Oct 2012
the service manual you have covers both models the major difference is in the number of output pairs.
first thing i'd do is see if there's any dc on the output + of that channel ahead of the relay of course.

do you have a dim bulb tester?

Last edited by turk 182; 10th October 2015 at 12:31 AM.
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