Control Board Led Locations; Led Function Description - Lincoln Electric Idealarc DC600 9773MSP Service Manual

TROUBLESHOOTING & REPAIR
CONTROL BOARD TEST
See Table F.2 for LED function during normal operation. See Figure F.9 for LED loca-
tion on Control Board.
FIGURE F.9 - Control Board LED Locations
LED # FUNCTION DURING NORMAL OPERATION
1 Glows to display that 115 VAC is present between leads #255 and
#256 at Plug J2 on Control Board.
2 Glows to display that output voltage feedback is being supplied to the
Control Board. Terminals #2 and #4 on the terminal strip must be
jumped together.
3 Glows to display that power is applied to fault protection relay (CR2).
4
DOES NOT GLOW. Glows only if there is a fault condition.
5 Glows to display a control signal (lead # 231) is being supplied to the
Firing Circuit. When the OUTPUT CONTROL SWITCH (SW-3) is in the
"Output Control at DC-600" position and the WELDING MODE
SWITCH (SW-4) is in the "CV" position, the LED will glow brighter or
dimmer as the OUTPUT CONTROL POTENTIOMETER is rotated. If
the pot is rotated clockwise (open circuit voltage increased), the LED
will glow dimmer. If the pot is rotated counter-clockwise (open circuit
voltage decreased), the LED will glow brighter. When the WELDING
MODE SWITCH (SW-4) is in the VV(CC) position for stick welding, the
open circuit voltage is at maximum. LED 5 will be very dim or not lit.
TABLE F.2 - LED Function Description
(Machine is ON)
F-29
IDEALARC DC-600