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Audioarts R-60 question

T

TomT

Have a problem with the control room module--the audition monitor select button "locks up" the module.

Not a switch problem--just changed all of them. Nor is it a sticky button problem--pulling the button out does not cure the problem.

Only way to "unlock" the module is to kill the console power.

Looks like from the schematic U-5 actually switches sources, but the same IC switches program on/off to the monitor as well. I suppose it could be the IC, but have rarely seen 1/2 of an IC fail.

Anyone run into this?
 
I'm assuming you have unsoldered the wires going up to the channel on switch, right? I've seen more mechanical failures than anything with consoles.
 
Depending on what it drives, sure you can have only one output on an IC die.
I've seen a lot of this in applications using 24 channel actuator systems with digital i/o addressing.
One system used output drivers for simple 6 volt bulbs. One shorted somehow, and next time the channel powered up,
it blew a perfect little concave divot out of the top of the 8 pin DIP.
The other channel and lamp driven by it continued to work just fine. I saved the chip.
 
The way the module is built there is no way to break the connection between the switch and the IC--especially not while the board is "hot."

I'll try swapping out the IC.
 
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