Kemppi MasterTig MLS 3003 ACDC - TECHNICAL DATA; MLS 3000 ACDC Specifications

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Measurements
Z004 Pre-inverter, rectifier:
- 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 ~0,5V, reverse
direction infinite. See the picture below for instructions.
- Repeat measurements for all six (6) instances. Pin locations marked in the pictures below.
Diodes* Measuring points Value
1. X1 -> 1 ~ 0,5 V
2. 3 -> X1 ~ 0,5 V
3. X2 -> 1 ~ 0,5 V
4. 3 -> X2 ~ 0,5 V
5. X3 -> 1 ~ 0,5 V
6. 3 -> X3 ~ 0,5 V
Diode 1.
Diode 4.
1
3
X1
X2
X3
Diode 1.
Diode 4.
1.
2.
3.
4.
5.
6.
* Diodes marked with red color in the right hand picture.