Lincoln Electric 10372 Service Manual page 91

F-27
6. If any test fails replace both switch
boards. See Switch Board Removal
and Replacement.
7. If the switch board resistance tests are
OK, check the molex pin connections
and associated wiring from the switch
boards to the control board. See
wiring diagram.
PPLY POSITIVE TEST
PROBE TO TERMIN L
11/12 OR 15/16
13/14 OR 17/18
11/12 OR 15/16
13/14 OR 17/18
TROUBLESHOOTING ND REP IR
SWITCH BO RD TEST ( ontinued)
FIGURE F.3 — SWITCH BO RD TEST POINTS.
T BLE F.1 — SWITCH BO RD RESIST NCE TEST.
+19
+19
- 20
- 20
POWER W VE 455/POWER FEED 10
-20 +19
11/12
OR
15/16
8. Reconnect leads 19C and 19D to the
reconnect switches. Ensure that the
leads are installed in the same location
they were removed from.
9. Install the right and left case sides
using the 3/8 in. nutdriver.
PPLY NEG TIVE TEST
PROBE TO TERMIN L
11/12 OR 15/16
13/14 OR 17/18
- 20
- 20
11/12 OR 15/16
13/14 OR 17/18
+19
+19
F-27
SWITCH
BOARD
13/14
OR
17/18
NORM L
RESIST NCE RE DING
Greater than 1000 ohms
Greater than 1000 ohms
Greater than 1000 ohms
Greater than 1000 ohms
Less than 100 ohms
Less than 100 ohms
Less than 100 ohms
Less than 100 ohms