Manual 0-4640
5-33
SERVICE
5
2. Output Diode Circuit Test
WARNING
Disconnect primary power at the source before taking any resistance checks.
a. Use an ohmmeter set to the diode function and make the following measurements on the Output Diode Board to Main
Power PC Board.
Meter (+) Meter (-)
Indication
E18
E21
Diode Drop
E21
E18
Open
E18
E20
Diode Drop
E20
E18
Open
E20
E19
Diode Drop
E19
E20
Open
E21
E19
Diode Drop
E19
E21
Open
E18
E19
(2) Diode Drops
E19
E18
Open
CutMaster 51 Output Diode
Test Readings
b. The meter should indicate a diode drop in one direction and an open in the other direction for each check. Replace Output
Diode Board if readings are not the same as the chart.
3. IGBT Circuit Test
a. Use an ohmmeter set to the diode function and make the following measurements on the IGBT Board to the Main Power
Board.
Meter (+) Meter (-) Meter (+) Meter (-)
Indication
E3
E13
E35
E13
Diode Drop
E13
E3
E13
E35
Open
E15
E3
E15
E35
Diode Drop
E3
E15
E35
E15
Open
E15
E13
E15
E13
(2) Diode Drops
E13
E15
E13
E15
Open
208/230V
Power Supply
400V & 460V
Power Supply
CM51 IGBT Test Indications
b. The meter should indicate a diode drop in one direction and an open in the other direction for each check. Replace IGBT
Board if readings are not the same as the chart.
c. Activate the torch.
• After two seconds INV ON indicator on the Logic PCB should turn ON. If indicator does not turn ON, replace Logic
PCB.
d. Measure open circuit voltage between E7(+) to E10 (-) on the Main Power PC Board. Voltage should be greater than 200
vdc. If voltage is less than 10 vdc, refer to the output diode test measurements or IGBT module test measurements or
shorted torch measurements.
Summary of Contents for CUTMASTER SL100SV
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