Kemppi MasterTig MLS 3003 ACDC - Page 21

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 !
Diodes* Measuring points Value
1. 2 -> 22 ~ 0,4 V
2. 8 -> 12 ~ 0,4 V
3. 24 -> 17 ~ 0,4 V
4. 10 -> 14 ~ 0,4 V
12
10
14
22
17
2
24
8
Diode 2.
Diode 3.
Diode 3.
Diode 2.
2.
3.
4.
1.
* Diodes marked with red color in the right hand picture.