Re: 2235 AN/USM-488 power supply low voltages


richardallred@...
 

Im still struggling with this power supply

If I remove the A5 board from the scope the power supply voltages return to normal and can be adjusted to spec by adjusting R938. As soon as I plug the A5 board back in the voltages drop to the following levels: and R938 has no affect
+5.2=4.3
+8.6=7.4
-8.6=-7.3
+30=+25.8
+100=+87.8

Also when I adjust the Scale Illumination knob the with of the trace shrinks

Any and all suggestion would be appreciated

R A

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