GEMINI XPB 1600 PDF

Table of Contents. If you try to operate at a lower. With the level. You also have the choice of keeping the volume of both speakers. Each channel's output is. If the LED does not illuminate, you have the.

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Hi, Would anyone have an electronic copy of the service manual, including schematic, for the Gemini GXA amp? 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. Last edited by turk ; 9th October at PM. Originally Posted by turk Sorry, I forgot I also checked if sound was also cutting in when the relay kicks in and it is.

Sounds clear and clean for that split second, so component testing in the relay area of the circuit. Checked the 1N out of circuit and that's okay. Tested the 3V3 Zener in circuit and that's showing the same as the other channel, so looking at the transistors now Yep, but not constantly.

If I play music through the channel the channel's LEDs do nothing but, say, once every couple of minutes the music will cut in through the speaker but this isn't necessarily in sync with the prot LED flickering for a second. It will flicker without the music cutting in. Using a process of elimination I have swapped the three transistors over from channel B to channel A along with what I believe to be the thermistor nearest this section of the circuit all without any change or improvement.

I've also replaced the IN and 3v3 Zener, just in case they were faulty but they don't appear to have been. I am considering swapping out the entire OP transistor block and heatsink, as that'll rule out the OP transistors in one fell swoop but it's a biggish job.

No physical movement, tapping, banging etc, affect the problem. However, the left channel Chnl B illuminates the yellow LED but then extinguishes followed by the occasional flicker. Since the sound comes through when the relay trips it seems to me to be the protection circuit being triggered by something closer like in the power amp section.

I've been working my way back from the output rather than forwards in hope that I am correct. BB code is On. Smilies are On. Forum Rules. All times are GMT. The time now is AM. Resources saved on this page: MySQL User Name. Stay logged in? Mark Forums Read. PA Systems A forum for discussion of all parts of a sound reinforcement or DJ system: loudspeakers, mixers desks etc.

Please consider donating to help us continue to serve you. Page 1 of 3. Thread Tools. View Public Profile. Send a private message to Phuture. Find More Posts by Phuture. Send a private message to turk Find More Posts by turk Quote: Originally Posted by turk the service manual you have covers both models the major difference is in the number of output pairs.

Posting Rules. Similar Threads. Pa Amp repair - any help? Nakamichi pa - repair. Latest project watt class AB mosfet amplifier. Please help me repair my PA speakers.

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Gemini XPB-1600 Power Amplifier

Hi, Would anyone have an electronic copy of the service manual, including schematic, for the Gemini GXA amp? 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.

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Gemini GXA-1600 User Manual

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