i am facing to fix 3 high voltage insulation tester (Kyoritsu type, 3122) which actually discontinue

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Hendrik Amrico Hutauruk

Joined Dec 14, 2016
1
Hello,


Seem i have the (maybe) same problem with Ninjaman. i am facing to fix 3 high voltage insulation tester (Kyoritsu type, 3122) which actually discontinued products. lucky me can solve one of the by replace 1 broken resistor. the other two only work for battery check. but when i try to connect to decade resistor, the needle moves to the left (negative, out of range). After i tried to analyze, the main problem was at the mainboard. This picture is the one which already good after change the resistor (Red circle).

all the mainboard was identically, but has a little different by number of passive components.

i have tried to check the Op-Amp (LP2904 & TL061) seems good. but i suspect the both op-amp, because there is no voltage drove to meter coil when i tested to decade resistor.

Please anyone could help me? give me some advance advice.

Thanks.
http://forum.allaboutcircuits.com/threads/high-resistance-measurement.71832/#post-1072947


Moderators Note:
Please don't hijack other member's thread, now you have your own.
This thread was split from -- High Resistance Measurement.
 

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