Thermal Dynamics C-20A Cutskill, Service Manual

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Manual 0-4697 6-7 TROUBLE SHOOTING
B. Component Tests
WARNING
Disconnect primary power at the source before taking any resistance checks.
1. Input Diode Module Board Circuit Test
a. Check Input Diode for short per schematic located in Appendix 4.
2. IGBT Module Test
a. With an ohmmeter set on the diode range remove P5 from the IGBT and make the following IGBT checks:
+ -
E1 Red DD (1.020)
Red E1 Open After Charging
1 Black Open After Charging
Black E1 DD (1.270)
E1 G1 DD (.770)
G1 E1 DD (.770)
E2 G2 DD (.770)
G2 E2 DD (.770)
E3 Red DD (1.270)
Red E3 Open After Charging
E3 Black DD (.770)
Black E3 DD (.770)
G3 E3 DD (.770)
E3 G3 DD (.770)
G4 E4 DD (.770)
E4 G4 DD (.770)
Gate PCB J5 IGBT Check
Diode Test
P5 Gate Connector
1 G1 Black 1 Black
2 E1 White 2 White
3 G2 Green 3 Green
4 E2 Red 4 Red
5 G3 Black 1 Black
6 E3 White 2 White
7 G4 Green 3 Green
8 E4 Red 4 Red
Control Connector
TW
TW
CN8
CN6
TW
TW
Pin-out diagram
b. If reading is not as shown, replace both IGBT modules and Gate PCB.
c. Reconnect P5 connector.