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TROUBLESHOOTING & REPAIR | ||
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FIRING BOARD TEST
FIGURE F.6 - Firing Board LED and Molex Plug Locations
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TEST PROCEDURE FOR NORMAL FIRING BOARD OPERATION
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
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 termi- nal #2 to terminal #4 on the termi- nal strip. These can be accessed through the Front Panel Assembly door. See Figure F.7.
WARNING
JUMPERING LEADS 2 AND 4 ELEC- TRICALLY ENERGIZES MACHINE’S OUTPUT TERMINALS. DO NOT TOUCH ELECTRICALLY HOT COM- PONENTS.
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7.Locate LEDs 1 thru 6. Each LED should glow with equal brightness.
NOTE: LEDs 1 through 6 indicate that the gate firing signals are being gener- ated to send to each of the output SCRs.
8.Set the output control switch (SW3) in the “Output Control at
9.Set the welding mode switch (SW4) in either of the “CV” posi- tions.
