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The power lite comes on but it will not work on any channel

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No audio from main speakon outputs A and B


Hi, I think in most amps switching to bridge mode simply means the amp supplies its total power through the left channel only. It's the best way to use all of your amp's power but nothing comes out of the right channel. Having speakers connected to both channels would simply mean that only the Left channel works, it would not blow it. Some amps have the speakers wired to binding posts and this varies according to whether you want mono, stereo or bridged. I can't help with the power board sorry

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This is likely a power supply failure within the unit. Needs to go to a shop for repair.

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1 Answer

There is no sounds coming out of the left channel


Assuming your PAN controls are centered at 12 o'clock, likely one of the power amps has failed. There is a design weakness in insulation on the circuit board of channel A that often fries three to 5 transistors and a Zener diode and sometimes a metering resistor. The board gets charred and requires a lot of work to carve out the cancer and restore the insulation and circuit traces. If the problem persists and one continues to use it, sometimes further arcing will destroy the power supply as well.

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1 Answer

Fender Concert II preamp is faint and distorted on 2 channel


It sounds like a job for a technician. There are high voltages in the chasis and the potential for a serious shock to the unwary. 

That said, I can suggest several possibilities.

First, make sure the controls aren't causing the problem. Contacts can build up dirt and oxides and block the signal. Try twiddling the controls and see if the problem comes and goes, or if you hear scratchy noises. If symptoms are found, buy a contact cleaner spray, take out the chasis after unplugging and letting it set for an hour, being very careful not to touch any exposed conductors inside. You'll see some holes in the control bodies; squirt cleaner for 2-5 seconds and work the controls.
Also see if the problem happens without the footswitch, and try the channel switches several times - same problem, dirt and oxidation.

Other possibilities - cathode bypass capacitors drying up, and it looks like the amp uses some opto-couplers at various stages. 

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1 Answer

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2 Answers

SPEAKER OUTPUT CHANNEL FAULTY, TWO MIKE CHANNELS DOWN


These are a real pain to open. You have to remove the front panel to remove a shield to remove the back amplifier power supply area. The power supply is a switching type and has lethal voltages present. Working on this should be done using an isolation transformer. With your symptoms, it is likely one side of the power amp MAY be blown, but do check that the wiring hasn't fallen off and the jack itself. Two pairs of wires come from the power amp to the front panel jacks. document location of ALL the cables you disconnect as they CAN be confusing to restore.

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