Electronics > Repair
Solartron 7061 7.5 Digits Multimeter Teardown and Repair
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Kosmic:
So replacing the WM222 by a VN2210 fixed the -Glug. Nevertheless I decided check the rest of the integrator before calling it a day.

For some reason (VN2210 being not exactly the same as WM222 ?) the -Glug Drive squarewave was curving a bit.

Trace 1 = +Glug Drive
Trace 2 = -Glug Drive


Increasing the capacity of C808 fixed the issue. I played with different value and  ended up using a 1uF tantalum capacitor.

Trace 1 = +Glug Drive
Trace 2 = -Glug Drive


The new transistor and cap installed on the board.

Kosmic:
Unit #1 is now passing Self-Test and seem to be fixed  :-+

Kosmic:
Next steps:
- Teardown
- Testing all electrolytic capacitors
- Replacing the Schaffner filter
- Replacing the memory backup battery
- Replacing the input connectors
coromonadalix:
Congrats for your repair  :-+
Kosmic:
Teardown:

All the 7061 PCBs


PCB 13 - Digital Board
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