Lincoln Electric INVERTEC 270SX Service Manual page 32

OUTPUT BOARD RESISTANCE TEST (continued)
Connector for
thermostat
TH1
A
R13
TEST PROCEDURE
1. Remove main input power to the INVERTEC
2. Perform the Discharge procedure
3. Visually check for burned or damaged components. If any components are physically damaged the input 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 Resistor R13 using ohmmeter, value shall be 100 ohms
6. Disconnect the two cables (A)
7. Follow the below tables to perform the remaining tests:
Output Diode modules (D1 – D3 – D5)
Positive Probe (RED)
4 (anode)
3 (cathode)
1 (anode)
2 (cathode)
Resistance value measured between output studs (+) and (-) shall be 100 ohms (see below picture)
for INVERTEC
A
®
270SX
Negative Probe (BLACK)
3 (cathode)
4 (anode)
2 (cathode)
1 (anode)
-
Page 32
®
270SX
Value
0.3V - 0.7V
OPEN
0.3V - 0.7V
OPEN
+
Output diode
modules