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Older Peavey PA Head XR600C. Problem with 400BH Board the B is like 0v unplug B and I have the voltages for the /- 16Volts. Plug in the B ( -52V) and nothing. Replaced all 4 6A2 diodes, caps test good, resistors test ok. 2 resisters fried, they were the 47 Ohm FP's. replaced those, tried new transformer. Disconnected the audio out board for isolation and the mixer section of the board. Need Help Thank you.

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  • Steve Griffith Jun 12, 2008

    I have the service manual...these are FREE from Peavey. I feel I was ripped off by this outfit and I am filing a complaint with Peavey. All resistors were replaced

  • Steve Griffith Jun 13, 2008

    the two resistors that were fried R58 and R59, 47 Ohm Flame proofs. I replaced some of t he 2K 5W, replaced the .1 Ohm 10 Watt, (2) replaced all the .33 Ohm 10 watt, the 1K 5 watts, and the 5.6 Ohm 5 watt. When I plug in the red/red-yellow/red, it goes down to 0 volts. I have it plugged in to a 100 watt light bulb to save the fuse.
    the lamp glows brightly. Now, when I unplug that secondary from the 400BH, and just leave the 15 volt supply on (orange/or-wh, orange works fine.
    Replaced the Diodes CR16,17,18,19.eplaced the Two Zeners. all the 2K 5W resistors test good out of the circuit.

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If you need a circuit for the PA board... get it from here

I would start by checking with a multimeter for shorts in driver transistors Q2 and 12

The output stage may be suspect for a driver to have failed. I would disconnect(emmitter and collector) of each output transistor for leakage and shorts in all directions (swap meter leads +ve and -ve). You can often tell at a glance that there IS a short in the output stage, by checking collector emitter with everything still connected. You cannot, however tell if there is leakage that may kill any repair work that you are doing.

Good work on the lamp. I use one in line with the mains socket on my test bench. I use a 40 watt build though.Have seen some smoke with higher wattages. I also use a variac to soft start the unit and do some DC checks mostly for symmetry in output stages with about 40-70 v into the 240 volt mains socket.

Let me know if you find any shorted transpistanators :)

regards
robotek

Posted on Jun 13, 2008

  • Graeme Ross
    Graeme Ross Jun 13, 2008

    Oh, and here in case you need it here is a quick tutorial in checking transistors that may help you with fault finding the drive and output transistors

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I will look this up to confirm, but these units are famous for having a 2K 5W resistor open up. This should be a square ceramic resistor. I'm not at the shop at the moment, but I'll look it up when I get back and try to give you more details. These units are counter-intuitive.

Stay tuned...
Dan

Posted on Jun 12, 2008

  • ABRsvcs Jun 12, 2008

    Forgot to ask... Which resistors were fried? Do you have the circuit designations?



    Thanks,

    Dan

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Im just giveing you my honest opinion about this.

Replace the whole board.

Posted on Jun 12, 2008

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Hi,

Please CLICK HERE to buy a service manual for your model.This service manual has all the schematics with detailed explanation which will help you fix this issue.Once you click on the link scroll down and select your model no. and click on BUY NOW to purchase the service manual.

Goodluck,
Please don't forget to rate or accept the solution

Posted on Jun 12, 2008

  • Priya darshan Jun 12, 2008

    Well that was the only sol. which i could give you from my side.The service manual should fix the problem.I believe you should give a complaint regarding this issue.

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I WILL ASSIST U IN A MOVEMENT.

Posted on Jun 12, 2008

  • hemant somaiya
    hemant somaiya Jun 12, 2008

    THOUGH THE RESISTORS LOOKS GOOD. REPLACE ALL OF THEM. IT MOSTLY SOLVES THE PROBLEM.RATE THIS SOLUTION IF IT HELPS U TOWARDS SOLVING UR PROBLEM.

  • hemant somaiya
    hemant somaiya Jun 12, 2008

    U CAN ALSO THE CLEAN THE MINUTE CONNECTION ON THE BOARD WITH ISOPROPHYL THIS ALSO SOLVES THE PROBLEM.BEFORE CHANGING OR BUYING NEW BOARD.

    THIS MAY SAVE YOUR TIME AND MONEY BOTH. TRY THIS. RATE THIS FIXYA IF THIS HELPS YOU.

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