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F-12
TROUBLESHOOTING AND REPAIR
F-12
POWER MIG 255C
4. Locate plug J6 on the control PC board.
See Figure F.1.
NOTE: The location of plugs may vary
depending on the machine code.
5. Locate the following leads on plug J6
on the control PC board:
TEST PROCEDURE
The ON/OFF POWER SWITCH will be
“hot” during these tests.
----------------------------------------------------------
NOTE: Secondary voltages will vary pro-
portionately with the primary input voltage.
1. Disconnect the main input power sup-
ply to the machine.
2. Remove the case top and side panels
with a 3/8 in. nutdriver.
3. Remove the tool tray with a 5/16 in. nut-
driver.
FIGURE F.1 — G3521 CONTROL PC BOARD AND M19248 SNUBBER PC BOARD
MAIN TRANSFORMER TEST POINTS.
J6
J5
J3
J8
J1
J4
J2
X8
(16J5)
X9
(8J5)
#206
(3J5)
X7
(4J6)
X6
(5J6)
X5
(6J6)
#208
(2J5)
#208
(2J5)
#209
(1J5)
MAIN TRANSFORMER TEST (continued)
WARNING
PLUG
LOCATION
6J6
5J6
4J6
LEAD
X5
X6
X7
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