Lincoln Electric INVERTEC POWER WAVE 450 SVM112-B Service Manual page 192

F-132
K941-1 REMOTE CONTROL KIT TRIGGER CIRCUIT TEST (continued)
J17
TEST PROCEDURE
NOTE: Before troubleshooting the remote con-
trol trigger circuit, troubleshoot the
remote control kit itself. Refer to the
K941-1 Remote Control Kit Test in
this section of the manual. If that test is
successful, perform the trigger circuit
test below.
1. Remove main input supply power to the
machine.
2. With the 3/8" nut driver, remove the 4
screws that hold the handle to the machine.
3. Remove the rubber gasket (cover seal) from
the lift bail.
4. With the 5/16" nut driver, remove the sheet
metal screws from the case top.
5. With the 5/16" nut driver, remove the
screws holding the right and left case sides.
Remove the case sides by lifting up and
out.
6. Perform the
Procedure described earlier in this section
of the manual.
TROUBLESHOOTING & REPAIR
FIGURE F.49 - DISPLAY BOARD PLUG LOCATIONS
J16 J15 J14 J13 J12 J11
Capacitor Discharge
POWER WAVE 450
J10
WARNING
Before continuing with the
test procedure, perform the
capacitor discharge proce-
dure to avoid electric shock.
7. After you have completed the capacitor
discharge procedure for all four switch
boards, remove the PC board cover. Use
the 5/16" nut driver.
8. Remove plug J12 from the display board.
9. Place a jumper wire between pins D and E
of the six-pin amphenol.
10. Remove the 5 leads ( 3 heavy and 2 small)
T1, T2, T3 from main input contactor CR1.
This is a safety precaution. It prevents
high voltage from being put on the
machine during the test.
around the lead ends to insulate them and
prevent them from touching.
F-132
Wrap tape