Tweco ArcMaster 201 TS, Service Manual

Page: 42 / 80

TWECO 201TS TROUBLESHOOTING
Troubleshooting 6-6 Manual 0-5150
!
Read and follow safety information in Section 6.02 before proceeding.
Measure point 1 to 18.
1. Measurement of Input Rectifier
Set multimeter to diode mode. Diode voltage drop reading should be in the range of 0.200 V - 0.700 V.
Positive Probe Negative Probe
Measure Point 2 Measure Point 1
Measure Point 4 Measure Point 1
Measure Point 3 Measure Point 2
Measure Point 3 Measure Point 4
If reading is out of voltage drop range, disconnect two parallel rectifiers and measure separately to deter-
mine faulty rectifier and replace it.
2. Measurement of Main IGBT
Set multimeter to diode mode. Diode voltage drop reading shuld be in the range of 0.200-0.600V.
Positive Probe Negative Probe
Measure Point 6 Measure Point 5
Measure Point 8 Measure Point 7
If reading is out of voltage drop range, replace main board.
3. Measurement of PFC IGBT
Set multimeter to diode mode. Diode voltage drop reading should be in the range of 0.200-0.600V.
Positive Probe Negative Probe
Measure Point 9 Measure Point 10
If reading is out of voltage drop range, replace main board.
4. Measurement of Boost Diode
Set multimeter to diode mode. Diode voltage drop reading should be in the range of 0.200-0.600V.
Positive Probe Negative Probe
Measure Point 12 Measure Point 11
If reading is out of voltage drop range, replace main board.
5. Measurement of Output Diode
Set multimeter to diode mode. Diode voltage drop reading should be in the range of 0.200-0.600V.
Positive Probe Negative Probe
Measure Point 13 Measure Point 14
Measure Point 15 Measure Point 16
If reading is out of voltage drop range, replace main PCB1.