Peavey XR-700

[e_c_mccollum]

I am looking for a schematic for the Peavey XR-700 powered mixing console. I am just interested in the mixer pre-amp, effects, eq, and in/out circuits.

[Novo]

Xr-700

I used to have one of those. I'd think Peavey would send or sell you a copy if you call or e-mail them. Unfortunately I traded mine for an XR-600B and never got around to getting a schematic or I'd send you a copy. Watch your cable runs though, you may need good wires and shorter runs to keep the amps from overheating...had that problem and added a fan to the top of mine before I found out that I needed better wires. 'Course that goes for most amp-speaker combinations.


Novo63

[bobsamps]

Peavey schems

I am looking for a schematic for the Peavey XR-700 powered mixing console. I am just interested in the mixer pre-amp, effects, eq, and in/out circuits.

Try emailing repair@Peavey.com/ and they can email them to you.

[e_c_mccollum]

I called Peavey earilier to find out there scanner is broken and it will take a couple of weeks to receive it though the mail.

[Enzo]

Aha, yep, it is not scanned into the data bass, only the power amp circuits.

There are two 11x17 drawings - the input channels and the master section. If you can't wait a couple weeks, send me an email requesting it, and I will scan them. They wil come in two parts since my scanner won't do 11x17.

[e_c_mccollum]

Enzo, I would like to have the master section if possible.

Both monitor and main output channels hum. Both amps work fine when a signal is applied to the PA input. Mixer section works when connected using the master output to the PA input bypassing the effects. Switched jack connecting pre-amp to pwr-amp tests fine.

Reverb circuit works but graphic eq circuit is questionable. When signal applied to input of eq, a hum is produced on the output.

Did'nt know you help out on the Peavey forum.

[Enzo]

Long shot. All those various patch jacks related to the master section, like graphic out, graphic in, main out, mon out, etc. Plug a cord into each one and measure for DC volts on the other end. Or measure at the jack if you have the chassis open. If any has several volts DC on it, there is a leaky diode. Peavey loves to add clamping diodes to their jacks to prevent signal excursions from passign the rail voltages. One leaks or shorts and DC appears there.

Also, the +/-15VDC supplies are on the power supply board. It is a dual regulated supply, the -15 is regulated, and the +15 tracks from -15. The two are not separately regulatd. MAke sure both 15v rails are up to voltage and clean.

Send me an email for the drawngs.

[bobsamps]

Peavey...

I called Peavey earilier to find out there scanner is broken and it will take a couple of weeks to receive it though the mail.

Wow..how unfortunate. Well I have two p.a.'s to fix, a XR500 + XR600. Been putting off for a while(I own 'em). Well Enzo gave you some good tips. I have had similar symptoms with them, but have found probs elsewhere too. Once I found a small cap shorted, that was a good hunt.

[Enzo]

I sent e c the schematic page he wanted.

ANd you can fix your 500 and 600. Peavey should already have those scanned. The power amp is a separate schematic. If you request XR600, they will include the power amp, but there are several, so ident the power amps you have in them and specifically ask that the particular ones be included. Look on the main power amp circuit board. it seays on teh foil side what type it is. XR600 used 400B/G and 400BH a lot for example.

[e_c_mccollum]

There is dc voltage on U10 outputs that equals power supply voltage. Leaky clamping diode or bad capacitors?

The amp was dropped on the speaker output side. I have been looking for cracks in traces and solder in the power supply, in/out, and master section.

Trying to fiqure out why + is 18v and - is 23v. No load is +/- 25v.

[Enzo]

Neither - bad U10 is my vote. Are they in sockets? Pull U10 and see if the voltages remain. I bet they don't. Looks like the schemo calls it a 4741, but it is just a TL074. If it is not already a TL074, you can use one there.

Note there are no clamping diodes connected to those ins and outs directly. Caps could fail but I don't recall one in the last decade at least.

The +/-15 is 18 and 23? At the ICs? Fix that. CR19 regulates the neg rail, and the pos side tracks off that.

[Majnoon John]

Guys, my Father is trying to fix an old transistorised Peavey XR-700 Dual Powered Mixing Console. We have tried to get the schematic and despite searching the web & Peavey's help, we can only find the IC based schematics. Would anyone have the schematics by any chance? If you do, could you scan and email them to me please. Many thanks, john.

[e_c_mccollum]

The schematics I have are in 2 parts like Enzo says. Are you looking for the power output stage?? U mention transistors. Most of this mixer that I know of is IC based except most of the power amp.

[Enzo]

Yes, what about it are you trying to repair?

The power amps are a separate schematic. I don;t know which one. If you have power amp problems tell me which power amp boards you have. Look on the power amp circuit boards, on the solder side, and see if there is a number like 260C or 400B or whatever.

[Majnoon John]

Enzo, e-c-mccollum, guys, thanks for your help; i will be back in the UK soon and will talk to my Father then; I will find all the numbers needed and hopefully we can shed some light on all this. Appreciate your help. My regards, john.