Lincoln Electric IDEALARC DC-1500 Service Manual page 66

F-32
CONTROL BOARD TEST PROCEDURE (continued)
L 9 L 6 L 5
1 2 P I N L 8 L 7 9 P I N L 2 L 4 L 3 L 1
G 1 5 8 7 - 1
G1587-1
12 PIN
TEST PROCEDURE FOR NORMAL
CONTROL BOARD OPERATION
1. Remove main supply power to the DC-1500.
2. Remove screws, loosen and lower the top left
case side panel to access and inspect the
Control Board located in the upper control box
of the welder.
3. Apply the correct three-phase input power to
the DC-1500. 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.
WARNING
JUMPERING LEADS 2 AND 4 ELECTRICALLY
ENERGIZES MACHINE'S OUTPUT TERMI-
NALS. DO NOT TOUCH ELECTRICALLY HOT
COMPONENTS.
--------------------------------------------------------------------------------
5. LED 1 should be lit indicating the presence of
115 VAC at leads #255 to #256 of 12 Pin Molex
Plug. See Figure F.10.
6. LED 3 should be lit indicating power is being
applied to the fault protection relay (2CR).
TROUBLESHOOTING AND REPAIR
FIGURE F.10 – JUMPER
L7
L8
L9
IDEALARC® DC-1500
L2
L1
L3
L4
L5
L6
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 (SW4)
in the "Output Control At DC-1500" (Panel)
position and the Welding Mode Switch (SW5)
in a CV position, LED 2 should change in
brightness as
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 out-
put is varied, LED 5 should change in brillian-
cy from bright (at low output) to dim (at high
output). When the Weld Mode Switch (SW5) is
in the CC (Stick) position, the open circuit volt-
age is at maximum, and LED 5 will be very dim
or not lit.
F-32
9 PIN
the Output Control