Lincoln Electric POWER WAVE SVM135-B 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.
APPLY POSITIVE TEST
PROBE TO TERMINAL
11/12 OR 15/16
13/14 OR 17/18
11/12 OR 15/16
13/14 OR 17/18
TROUBLESHOOTING AND REPAIR
SWITCH BOARD TEST (continued)
FIGURE F.3 — SWITCH BOARD TEST POINTS.
TABLE F.1 — SWITCH BOARD RESISTANCE TEST.
APPLY NEGATIVE TEST
+19
+19
- 20
- 20
POWER WAVE 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.
PROBE TO TERMINAL
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
NORMAL
RESISTANCE READING
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