Troubleshooting and repair – Lincoln Electric POWER MIG SVM170-A User Manual
Page 64
Advertising
F-24
TROUBLESHOOTING AND REPAIR
F-24
POWER MIG 255C
4.Verify that the capacitors have completely
discharged with a volt-ohmmeter.
5. Disconnect plugs J6 and J5 control
board. This electrically isolates the
SCR bridge assembly. See Figure F.6.
TEST PROCEDURE
1. Disconnect main AC input power 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.
ACTIVE SCR RECTIFIER ASSEMBLY TEST (continued)
FIGURE F.6 — CONTROL BOARD MOLEX PLUG LOCATIONS FOR G3521 PC CONTROL BOARD.
J6
J5
J3
J8
J1
J4
J2
Advertising