peavey amp

fellowesman · 15th January 2006, 03:58 PM

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

Netlist · 15th January 2006, 04:17 PM

I have the schematic but it's bad to read as well. I'm willing to scan it. It will be tomorrow though.

/Hugo

Netlist · 15th January 2006, 05:59 PM

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

fellowesman · 15th January 2006, 10:49 PM

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

Netlist · 16th January 2006, 04:35 PM

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

Tarzan · 16th January 2006, 05:58 PM

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

fellowesman · 17th January 2006, 12:13 AM

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??

fellowesman · 17th January 2006, 12:13 AM

peavey dose not show a mjee15031 on there web site has a
15030 and a 15032 are they all the same???

Tarzan · 17th January 2006, 06:29 AM

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

fellowesman · 21st January 2006, 03:02 AM

will let you know when i have them taken out

15th January 2006, 03:58 PM	#1
fellowesman diyAudio Member Join Date: May 2005 Location: mich	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

15th January 2006, 10:49 PM	#4
fellowesman diyAudio Member Join Date: May 2005 Location: mich	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

17th January 2006, 12:13 AM	#7
fellowesman diyAudio Member Join Date: May 2005 Location: mich	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??

17th January 2006, 12:13 AM	#8
fellowesman diyAudio Member Join Date: May 2005 Location: mich	peavey peavey dose not show a mjee15031 on there web site has a 15030 and a 15032 are they all the same???

21st January 2006, 03:02 AM	#10
fellowesman diyAudio Member Join Date: May 2005 Location: mich	peavey will let you know when i have them taken out


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

15th January 2006, 04:17 PM	#2
Netlist diyAudio Moderator Emeritus Join Date: Jan 2003	I have the schematic but it's bad to read as well. I'm willing to scan it. It will be tomorrow though. /Hugo

15th January 2006, 05:59 PM	#3
Netlist diyAudio Moderator Emeritus Join Date: Jan 2003	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

16th January 2006, 04:35 PM	#5
Netlist diyAudio Moderator Emeritus Join Date: Jan 2003	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

16th January 2006, 05:58 PM	#6
Tarzan diyAudio Member Join Date: May 2004 Location: Genk	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

17th January 2006, 06:29 AM	#9
Tarzan diyAudio Member Join Date: May 2004 Location: Genk	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

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
peavey 18's	dan	Multi-Way	16	14th April 2011 05:28 PM
Help for my Peavey PV8.5C	fabiodord	Solid State	17	8th June 2008 08:29 PM
peavey cs 800	erockin	Solid State	1	30th March 2007 11:38 PM
peavey	fellowesman	Solid State	10	22nd April 2006 06:55 PM
Peavey Cs-800 Pwr. Amp	dstx144	Solid State	10	30th January 2006 04:16 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read