Lincoln Electric IDEALARC DC-1000 Service Manual page 56

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FIGURE F.6 – FIRING BOARD LED AND MOLEX PLUG LOCATIONS
TEST PROCEDURE FOR NOR-
MAL FIRING BOARD OPERA-
TION
1. Disconnect main AC input power to the
machine.
2. Remove screws, loosen and lower the front
panel to access the Firing Board on the left side
of Control Box facing the machine.
3. Visually inspect the Firing Board for loose or
faulty connections.
4. Reconnect the input power and turn the
DC-1000 on.
5. Locate LEDs 7, 8, and 9 on the Firing Board.
See Figure F.6. Each LED should be ON and
equally bright. Use Table F.1 to check LED
operation.
6. Connect a jumper wire from terminal #2 to ter-
minal #4 on the terminal strip. These can be
accessed through the Front Panel Assembly
door. See Figure F.7.
TROUBLESHOOTING AND REPAIR
FIRING BOARD TEST (continued)
IDEALARC
WARNING
JUMPERING LEADS 2 AND 4 ELECTRICALLY
ENERGIZES MACHINEʼS OUTPUT TERMINALS.
DO NOT TOUCH ELECTRICALLY HOT COMPO-
NENTS.
_________________________________________________
7. Locate LEDs 1 thru 6. Each LED should glow
with equal brightness.
NOTE: LEDs 1 through 6 indicate that the gate fir-
ing signals are being generated to send to
each of the output SCRs.
8. Set the output control switch (SW3) in the
"Output Control at DC-1000" position.
9. Set the welding mode switch (SW4) in either of
the "CV" positions.
® DC-1000
F-22