Last weekend while I was playing, I smelled that smell. After I turned my 800RB bass amp off I saw smoke coming out of the foot switch input so I hooked up my spare amp. When I took the amp apart I found that part of the big board inside was black & 5 or 6 of the resistors & one of the capacitors on the board were burnt black. It's the biggest circuit board in the amp, is that the Motherboard? Expensive to repair? Impossible to find?

Foot pedals are usually NOT interchangeable... The correct footswitch would come with the amp so be sure it says Behringer on on the footswitch. Apparently some sellers have foisted off VOX footswitches which may not work with the Berhinger.

The speaker is blown. Did it smell a little funny when this happened. Sometimes they get a faint burning smell when they blow. Some Peavey amps especially older ones are known for letting DC current slip through to the speaker and blows it immediately. Most of the rest of the amp deals with that pretty well so I'm not quite sure what going on with the standby switch. Probably just a blown bulb.

In general it is not a good plan to run the amps without a load. However in this case you can turn the individual levels of the two power amps to zero and be safe.

GK does have a version that runs under 240Vac, but it may not be available in the US. I would check with GK directly. Also, an option would be to use a tramsformer for this unit. These are available for around $50 or so for the power requirements of the GK unit. This would allow you to use the amp at either 240 or 110 without the need to change anything inside which would void any warranty.

Dan

You did a lot of damage, and replacing the fuse and trying it has caused much more.

There will be about seven blown parts on the amp and a dozen on the power supply. To give you an idea of the extent, the WHOLESALE parts cost is roughly $50, including the main power supply switchers IGBT's which cost nearly $20 for the pair by themselves.

I have repaired several of these and the larger cousin the PMP5000. It is a lot of skilled work to repair these.

The cause is a marginal insulation between layers of the multi-layer amplifier board. Usually the rearmost amp arcs between the layers. This fries three big switching transistors followed sometimes by a metering resistor and two small surface mounted transistors. A zener diode often goes. The cancer and burned area has to be ground out with a dental drill and new wire replaces the blown circuit traces.

If you are under warranty, take the unit for replacement.

The thing that can arc the amp is if speaker leads are marginal or get pulled out while under power. Excessive volume, especially pulses at high level can break down the insulaton causing the arc and failure. The black smoke is likely from the metering resistor.

With everything switched off. I will surmise that you are using the onboard battery with the foot pedal and not a power supply.
1. Plug lead from guitar/instrument into INPUT side of pedal
2. Plug lead from OUTPUT side of pedal into amplifier INPUT.
3. Turn amplifier volume to about 10 o'clock - to stop blowing your ears out.
4. Turn volume up on guitar to acceptable level.
5. press foot switch on pedal and adjust pedal controls to suit your type of distortion.
6. Play like Hendrix.
Good Luck
ps Just as an after thought rechargeable 9volt batteries are the way to go. I've been using them for years as I always get caught up in the power cable.
If you're going to add another pedal like a Phaser, Compressor, Flanger or what just use small connect leads between each pedal but always, always put the compressor pedal last in the line.

If you got smoke and now it is making wierd sounds then it is fried. DO NOT turn it on until it gets seen by a repairman, unless you think fire is a good thing =)

did you change out the fuse? could be a tranny going south. if you change the fuse and you still get no power, then you have a fried power transformer. they are relatively easy to replace. look on ebay . get the numbers off of the existing one and start web searching. something will come up. if not email me on my contacts tab in my website yostamplifier.com we can troubleshoot. you should see the custom blue voodoo i built and gave to my little brother.

BIG problem! You should NOT have replaced the fuse as additional damage has been done. I repaired a PMP5000 and I can tell you likely what you will find: The smoke and smell came from two power resistors that are part of the soft start circuit that now are toast. You will likely find several components in the main portion of the power supply that are toast. These will include transistors, resistors, diodes, and probably the small 8 pin switching regulator chip. There is a small power supply that comes on first which enables a relay that shorts out those soft start resistors AFTER the power amplifier BALANCES and normalizes.
The unit I repaired had severe damage due to arc-over at one power amp section. Three power transistors were destroyed there and board traces and charring had to be handled in that section.
The repaired unit had to be brought up with a light bulb in series with the line power cord to prevent further damage until all bad parts were discovered and repaired. You will need to take the unit to a shop that is expperienced with the product. The repair cost MAY be pretty high.

Run a jack from your guitar to Input R Mono on the pedal.
Run a jack from Output R Mono on the pedal to the input of your amplifier.
There is a switch for guitar or Bass. Put the swich on guitar
You do not need a preamp to use this pedal.
Hope this helps,
Maxx.