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Re: How do u check pcb board on musical equipment and on...
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 ;)
Testimonial: "Ok but like u said to me start with the highest and then work down ward but how do i do this like i said i do have a fluke meter but how do i do it and where do start at? do i need to know the ranges for chips and seminconductors ,is there a chart with the ranges of all these type of component"
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Firstly determine that the power supply you are using is providing the correct voltage, check with a multimeter.
If it is correct then you need to open the piano. Look inside where the power plugs in check the little black socket and ensure that there are no breaks where this is soldered to the circuit board - very common problem. If so resolder or replace socket. Does turning the switch on make the red light come on - if not and socket is soldered correctly - suspect the switch - check continuity wilth multimeter, if switch is ok check voltage across pins 1 & 5 on CN2 on board this should read around 12v. if this doesnt show a voltage it is easier just to replace the whole DCIN board # WM227400
Your right, it is not rocket science, this is way bigger and funnier!
Now, that you took apart the chasis fron the cabinet, you may try testing if the channel switching occurs when you hit the Printed Circuit board with some tool like the handle of a screwdriver. you can try with light hits and different places of the PCB while watching what happens in the front panel light. also you can try bending the PCB with your hand to see what happens, if the switching occurs, maybe you have a cracked solder on the pedal jack or in any component related to the switching circuit, in this case, you will have to pull out the pcb, and re-solder those points that can be cracked. Using a magnifiying glass is very helpful in looking for those cracked solders.
Good luck and best wishes.
Unfortunately Behringer equipment is hard to get parts for generically. You may be able to order the whole amp from behringer but I doubt it. I have had lots of problems repairing them for that reason and I will no longer use any of their stuff. The IC's could be repaired but can't find any record or crossover to any of their output transistors. It appears they are custom made for Behringer. Sorry, I can't help any more than that.
You have a bad power circuit board. if you are tech-inclined,you can open the mixer's rear cover and check for bulging/leaking capacitors on the board. they will need to be replaced. Or just order a new PCB from Peavey. Rodger, in tech support, will be happy to help.
Make sure you are using balanced lines, especially to the power amps. ALSO make sure ALL interconnected equipment is powered from the SAME receptacle or source, even if it means running extension to where the amps are powered. Ground loops are a pain and can cause serious damage to your equipment.
If otherwise you must open to check the power to the incoming board, the regulator , the supply to the main switch and the power to the main board, the synthesizer section/processing board. remove and plug back all connections, if not there are errors in the PCB.