Black Jupiter 2000 Function generator circuit.

[johnmcgivern]

This sounds encouraging, as it suggests that the complicated bits are OK. My next move would be to see if there is a signal at the top of the amplitude control (VR17), and that all 3 (triangle, square, sine) are OK. That rules out the switching. Then check the output of the amplifier (junction of R76/77), and if it's OK there, then the output attenuators are likely to be the issue. I guess the amplifier is most likely to be at fault, assuming you've already tried a bit of switch cleaner on all the switches.

Cheers,

Mark

Hi Mark, Been prodding around with scope and Dmm Junction R76/R77 shows -14v
I am not too sure if VR17 was the correct pot if it was there was no voltage will double check tomorrow.
What is 5vaux on the drawing also some resistors have 75 or 4 beside them is this the wattage ie .75 watt and .4watt. Just a guess.
Regards, John