Lincoln Electric IDEALARC DC-1000 Service Manual page 62

F-28
FIGURE F.9 – CONTROL BOARD LED AND PIN LOCATIONS
TEST PROCEDURE FOR NORMAL
CONTROL BOARD OPERATION
1. Remove main supply power to the DC-1000.
2. Remove screws, loosen and lower the Front
Panel to access and inspect the Control Board
located in the right front control box. See Figure
F.9.
3. Apply the correct three-phase input power to
the DC-1000. Turn on the machine.
4. 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.
WARNING
JUMPERING LEADS 2 AND 4 ELECTRICALLY
ENERGIZES MACHINEʼS OUTPUT TERMINALS.
DO NOT TOUCH ELECTRICALLY HOT COMPO-
NENTS.
__________________________________________________
5. LED 1 should be lit indicating the presence of
115 VAC at leads #255 to #256 Plug J1.
6. LED 3 should be lit indicating power is being
applied to the fault protection relay (2CR).
TROUBLESHOOTING AND REPAIR
CONTROL BOARD TEST (continued)
IDEALARC
7. LED 4 should NOT be lit. LED 4 should light
only if there is a "fault" condition.
8. LED 2 should be lit indicating output voltage
feedback is being supplied to the Control
Board. With the Output Control Switch (SW3) in
the "Output Control At DC-1000" (Panel) posi-
tion and the Welding Mode Switch (SW4) in a
CV position, LED 2 should change in brightness
as the Output Control Potentiometer is rotated.
As the open circuit voltage is increased, LED 2
should get brighter and vice versa.
9. LED 5 indicates a control signal (lead #231) is
being supplied to the firing circuit. As the output
is varied, LED 5 should change in brilliancy
from bright (at low output) to dim (at high out-
put). When the Weld Mode Switch (SW4) is in
the CC (Stick) position, the open circuit voltage
is at maximum, and LED 5 will be very dim or
not lit.
® DC-1000
F-28