Lincoln Electric CITOTIG 315DC Service Manual page 40

OUTPUT BOARD RESISTANCE TEST (continued)
Connector for
thermostat TH1
Output diode
modules
D2,D6,D11
Output resistor
R17
TEST PROCEDURE
1. Remove main input power to the CITOTIG 315DC
2. Perform the Discharge procedure
3. Visually check for burned or damaged components. If any components are physically damaged the
output board should be replaced
4. Check the thermostat TH1, connected to the green connector (see picture above), with ohmmeter;
correct value is 0 (zero) ohms (short)
5. Check the Output Resistor R17 using ohmmeter, value shall be 100 ohms +/- 20%
6. Disconnect the two power cables removing the two screws (A)
7. Disconnect the three terminals (B)
8. Check the rectifier bridge D12
9. Follow the below table to perform the remaining tests:
for CITOTIG 315DC
1
4
1
4
1
4
W05X1326-2 used on 315DC
Output Diode modules (D2 – D6 – D11)
Positive Probe (RED) Negative Probe (BLACK)
4 (anode) 3 (cathode)
3 (cathode) 4 (anode)
1 (anode) 2 (cathode)
2 (cathode) 1 (anode)
2
3
2
3
~ +
- ~
2
3
Value
0.3V - 0.7V
OPEN
0.3V - 0.7V
OPEN
41
A
A
B
Doubler circuit
diode bridge
module D12
B