Maybe worth mentioning... the multimeter was exposed to rain late last summer. It was forgotten outdoor, and quite wet. But after drying, it has worked flawlessly since. At least 8-9 months..
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So I tested more, cleaned the rotary-switch circuit, and put on a tiny solderingtip on the switch itself, in case the pressure isn't sufficient to make a steady contact. But no difference.
It doesn't behave 100%the same every time:
Either VDC started working, or I tested too few times.
But now, VDC is working 9 of 10 times. My bench-powersupply gives 2-15VDC and it reads as expected. (auto and manually)
mVDC however is steady 0.00. - It shoud read like 2900mV @2.9v - The 189 does that.
Ohm-setting 99.99% of the time shows, steady 0.00 Ohm - the beeper mode beeps all the time.
VAC is totally wrong. Often peaks at OL and the bar indicates >1000V
Or it is around -0- , and when I try the wall-outlet it says 40-50 or 65-75 or doesn't react.
Or it displays approx 450VAC with no probes, and runs up and down.
Amps gives nothing. 0,0A 0,0mA -Lightbulb/led in the flashlight is lit.
The measuring done with the MOV out of the pcb was done with no power attached.