Working on the hardwired versions of these consoles can be a pain. Keep in mind that the connectors on the non-hardwired versions can create their own set of problems the hardwired versions don't have!
When repairing a channel that has one bad chip or component I've usually been able to replace it from the top or bottom without disturbing the buss wires. If you go in from the top you need to remove the mounting screws from all of the channels. You can then CAREFULLY "fan out" the modules like an accordion to gain access to the bad one. You may have to cut the +48 volt buss in some situations. Cutting the bus wires to remove a module or group for more extensive work is usually necessary. Once they are mounted back in the frame you can just wrap a piece of buss wire around each "break" to patch it, then solder away. Finally, if you are replacing all the buss wires after a major overhaul, place the console on its side. Gravity then helps flow the solder between the bus and the solder pad on the circuit board. We have had to -re-string several of these over the last 20 years. It really isn't as bad as it first seems. Greg Dwinell Orange Sound
