pucho812
Well-known member
This is an odd one. Luckily we have schematics in the tech docs and calibration instructions.
When metering output meter jumps far right off the scale.
I tracked it down to an opamp ic10 which was outputting -12vdc in ref to ground.
I replaced opamp 10, an lf347 chip. And it was working fine for a second, then back to thevoutput metering pegged far right.
The unit is passing signal and all other functions work as they should.
Per calibration instructions in the tech documents, the psu is measuring correctly. W other chips seem to be ok.
The only other thing I have noticed is pin 14, 13, 12, and 8, 9 , 10 all measure continuity to ground when switched to meter output.
With the chip out, I get 1.4vdc at pin 13 when set to meter output.
When metering output meter jumps far right off the scale.
I tracked it down to an opamp ic10 which was outputting -12vdc in ref to ground.
I replaced opamp 10, an lf347 chip. And it was working fine for a second, then back to thevoutput metering pegged far right.
The unit is passing signal and all other functions work as they should.
Per calibration instructions in the tech documents, the psu is measuring correctly. W other chips seem to be ok.
The only other thing I have noticed is pin 14, 13, 12, and 8, 9 , 10 all measure continuity to ground when switched to meter output.
With the chip out, I get 1.4vdc at pin 13 when set to meter output.
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