Lincoln Electric RANGER 305G EFI Service Manual page 56

LINCOLN ELECTRIC
16. If the 80 to 100 VDC supply voltage is present at the weld control board, but there is no PWM gate
signal, check the voltage between leads 2+ (J1-4) and 4 (J1-3). See Wiring Diagram. The voltage
should be about zero VDC.
17. If about 5 VDC is detected, the welding terminal control circuit is open. Check for damaged leads for
faulty connections at leads 2 and 4; also check for a defective welding terminal switch. See the
Wiring Diagram.
18. If the PWM signal remains after the welding terminal switch has been placed in the "REMOTELY
CONTROLLED" position, check the voltage between leads 2+ (J1-4) and 4- (J1-3) at the weld control
board.
19. If the voltage reads zero or near zero, check for damaged insulation at leads 2 and 4, also check for a
shorted welding terminal switch or damaged or contaminated Amphenol receptacle. See Wiring
Diagram.
20. If the above wiring and components are undamaged and functioning properly, the weld control
board is defective and should be replaced.
21. If the voltage reads about 5 VDC and the PWM signal remains, the weld control board is defective
and should be replaced.
22. Perform the Case Cover Replacement Procedure.
Ranger® 305G EFI Service Manual
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