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Old 15th January 2006, 04:58 PM   #1
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Question peavey amp

working on a peavey amp
one of the mje15031 chips looks as if it has a hole blown in it
is there a diode right to the right of it blown to bits
the schematic is old and not realy readable
this is a pevey 8.5c
any please
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Old 15th January 2006, 05:17 PM   #2
Netlist is offline Netlist  Belgium
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I have the schematic but it's bad to read as well. I'm willing to scan it. It will be tomorrow though.

/Hugo
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Old 15th January 2006, 06:59 PM   #3
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I looked at the schematic and it's really no use to scan it. I can hardly read the original.
However, you diode is probably CR140 or CR240 if mounted on/in the heatsink and the original part number is 13886.
It's a diode consisting of two series diodes in one housing.
I recall replacing it with two 1N4007 in series for testing and it worked. I don't recommend this as a good repair. Try to get the original if you want to do a proper job.

/Hugo
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Old 15th January 2006, 11:49 PM   #4
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Question peavey

thanks for the offer
i think the diode is a mps??? cant read will the mje15031 take this
out and is there a way to test on the board??
thanks
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Old 16th January 2006, 05:35 PM   #5
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As for the output transistors, you will to take them out to measure them if that was your question.
Here is the diode you are looking for.

/Hugo
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Old 16th January 2006, 06:58 PM   #6
Tarzan is offline Tarzan  Belgium
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Hi, I have a PDF version of the schematic.
If you like to have it, ask.
It's not of a superior quality but usable.
I have an 8.5C in repair to.
The complete drive and power stage of one channel was gone.
Most of the parts are easy to get apart from some like CR145 (SBS14)
I'm waiting for some parts and then see if it's working again.
Cheers,
Zilog
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Old 17th January 2006, 01:13 AM   #7
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Thumbs up peavey

if you have it in a pdf that would be great
i was asking if there is a good way to test the mje15031 on the
board or if i need to take them out??
also will the mps blow from a bad mje chip??
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Old 17th January 2006, 01:13 AM   #8
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Question peavey

peavey dose not show a mjee15031 on there web site has a
15030 and a 15032 are they all the same???
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Old 17th January 2006, 07:29 AM   #9
Tarzan is offline Tarzan  Belgium
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Hi,
the only MJE15031 is Q103 and 203.
MJE15030 - Power 8A 150V PLA NPN. MJE15031 idem but PNP.
To do a reliable test on this tor, remove it from the board.

I had a similar problem and found that all power transistors were gone. It even burned a hole in the pcb.
The surounding parts were burned to.

It's best to check all the powertransistors if they are good.
Check the power resistors to as they probably are all open.
I would advise, now that you're bussy, check all the prodrivers to from that channel. The diodes to in the driver board and the power board.
It's a lot of work but worth it.

I hate smoke and fire to come out of a repair that's been done quick-quick.
Take your time...
Zilog
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Old 21st January 2006, 04:02 AM   #10
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Default peavey

will let you know when i have them taken out
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