Lincoln Electric CITOTIG 315DC Service Manual page 36

INPUT BOARD RESISTANCE TEST (continued)
AC input power supply
400V +/- 15%
Fuse FS1
Water
Cooler
Connector
TEST PROCEDURE
1. Remove main input power to the CITOTIG 315DC or 415DC
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. Using the Volt-Ohmmeter (diode test mode) check the fuse FS1
5. Using the Volt-Ohmmeter (diode test mode) check the Input Rectifier D1 (see Table tests 1)
Using the Volt-Ohmmeter check PTC for
6.
(short) on capacitors or IGBT is present
Fig.1)
Positive Probe (RED)
1 (AC)
2 (AC)
3 (AC)
4 (+)
4(+)
4(+)
5 (-)
5 (-)
5 (-)
1 (AC)
2 (AC)
3 (AC)
W05X1328 used on 315DC (picture above)
W05X1328-2 used on 415DC
(this check must be done from the input board solder side, see
Input Bridge - Table tests 1
Negative Probe (BLACK)
4 (+)
4(+)
4(+)
1 (AC)
2 (AC)
3 (AC)
1(AC)
2 (AC)
3 (AC)
5 (-)
5 (-)
5 (-)
3
5
2
4
1
100 ohms +/- 20%. If PTC does not pass the test may be a failure
Value
0.3V - 0.7V
0.3V - 0.7V
0.3V - 0.7V
OPEN
OPEN
OPEN
0.3V - 0.7V
0.3V - 0.7V
0.3V - 0.7V
OPEN
OPEN
OPEN
37
Input bridge B1
Fig.1 – PTC test
PTC = 100 ohms +/-20%