Kemppi Mastertig MLS 3003 ACDC Service Manual page 21

Measurements
Z001, Main circuit card :
- Power should be off !
- With these measurements you can find short circuits and partly open circuits that indicates fault in
the machine.
- Measure diodes in forward and reverse direction. Forward diode threshold voltage is ~0,4V, reverse
direction infinite. See the picture below for instructions.
- Repeat measurements for all four (4) instances. Pin locations marked in the pictures below.
- Remember that MLS 3000 ACDC and 3003 ACDC have different Z001 cards !
12
14
17
22
Diodes*
1.
2.
3.
4.
* Diodes marked with red color in the right hand picture.
10
8
Diode 2.
Diode 3.
2
24
Measuring points
2 -> 22
8 -> 12
24 -> 17
10 -> 14
1.
2.
3.
4.
Value
~ 0,4 V
~ 0,4 V
~ 0,4 V
~ 0,4 V
Diode 2.
Diode 3.
21