Electrovoice 81PMX Powered Mixing Board

[TedinOttawa]

After needing my mixer fixed I was able to track down a service manual.
This 200 watt mixing board is a remarkable piece of older technology (early 1990's)
... if you have one & need a repair .. contact
Bosch Communications Systems (USA)
Pro Audio - Technical Support Group
12000 Portland Ave South
Burnsville, Minnesota 55337
United States
phone:
800-392-3497
fax:
952-884-0043
website:
Bosch - Bosch Communications Systems
They'll be happy to send you a PDF format manual.

[Twist]

They have very helpful for me also. I don't know about most of the techs on this forum but a big part of my repairs are for equipment other than guitar amps. Sometimes it's difficult to find schems for older mixers. Right now I need to find one for an old BiAmp 8/29.

[TedinOttawa]

Electrovoice 81PMX Mixing Board

Well - I just found out that what I got from Bausch was insufficient for my tech;s needs .. so I'm back at square one ... still looking for the schematics for my mixing board ... any help out there ?

Ted

[Enzo]

Perhaps if you told us what the problem was and what your tech needs?

Twist, i am looking through my files, I may have that Biamp.

[Enzo]

Maybe not. What about the Biamp do you need. A lot of their circuits are similar to one another.

[TedinOttawa]

Electrovoice 81PMX mixing board

Here's what I got back from the tech:

" Problem is the output from the pre-amp/eq section of the board is low. The
power amp section is working fine. I tested the power amp section using the
pre-amp output from another mixer - has lots of power.

Any ideas ?

Thanks

[Enzo]

So something in the master section is bad. I assume he explored the patch jacks.

[Gtr_tech]

Was that made in Germany by Dynacord like the EV P series pwr amps? If so, you might go straight to them.

[Enzo]

The Germans make good stuff, but they can't do it all day....