20 Most Recent Gemini Sound Products GEMINI XGA 4000 4000 WATT AMPLIFIER XGA4000 Questions & Answers

Question edited for a lot more clarity. Question moved from Office Equipment. Not much on it, but make sure vents are clear https://www.google.com/search?q=xga+4000+protect+mode+reset ..

Switch input connection pairs and if the 'fault' doesn't changes from one channel to the other it is almost certainly an amplifier or output fault. Likewise switching the speakers. If after swapping the speaker connections the fault changes to the other speaker it is an amplifier fault. If not a speaker fault.

I have a Gemini xga 4000 that only channel 2 works fine but channel 1 is very very low .......

One of the first things a technician does with a voltmeter it to check 'all the voltages' in a system are correct.. Even without a specific circuit diagram for the board, 'Applications Notes' for chips and seminconductors will give nominal expected voltages in a working circuit. Remember you can burn out the meter by connecting it to any source of current when on the Ampere or Ohm settings. Technicians usially start at a high (highest) Voltage range setting and work downwards.. Providing the maximum Voltage is not exceeded on any range, whether it is AC or DC will not damage the meter. 'Fluke' by the way are a 'top end' professional product - check the price ;)

The most likely case is that one of the main output transistors (if which there are many) is shorted. When the protect circuit senses DC on the final output, it will not allow the output relay to come on to protect the speakers from raw DC. With the power removed, you can check between each outputs Emitter and Collector and you will probably find close to zero ohms. From that point you need to unsolder each of the pins of the bad channel until you find the shorted device(s) and replace them.

'pianoforte'

BREV. N. 838420

See page 22 troubleshooting of this manual. It may help you. dd501 (yamaha.com)

Depending on the model, there are four around that date, it could be the insert jacks are tarnished reducing the signal flow between the pre amp stage and digital power amplifier. It could be the power amplifier has failed. It could even be customer error in wiring. This assumes there is the correct level of signal entering the input sockets of course.

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It's a Line 6 and probably requires a software update from Line 6.

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