Lincoln Electric IDEALARC DC-655 Service Manual page 63

F-21
12. Test for 9.5 VDC to 11.0 VDC between
leads #231 and #215 on the firing board.
Make sure the Mode Switch (SW2) is in a
constant voltage (CV) position.
Locate plug J5 on the firing board. Locate
leads #231 (pin-13) and #215 (pin-12). See
Figure F.4.
Connect a jumper wire from pin C (lead #2)
to pin D (lead #4) at the 14-pin receptacle.
(Or put the Output Terminal Switch in the
ON position.) This should initiate machine
output at the welding terminals.
Rotate the Output Control (R1) clockwise
and counter-clockwise.
between leads #231 and #215 should vary
from 9.5 VDC to 11.0 VDC as the control is
turned from minimum to maximum. If the
voltage varies and LEDs 1 through 6 do
NOT vary in brightness, the firing board
may be faulty.
If the voltage does NOT vary, the control
board, control potentiometer or associated
leads may be faulty.
Diagram.
TROUBLESHOOTING & REPAIR
The DC voltage
See the Wiring
IDEALARC DC-655
13. Test for approximately 5.5 VDC between
leads #231 and #215 on the firing board.
See Figure F.4.
Put the Mode Switch (SW2) in the constant
current (CC) position.
Rotate the Output Control (R1) clockwise
and counter-clockwise.
between leads #231 and #215 should be
constant at approximately 5.5 VDC. This
voltage should not vary when the output
control is turned.
F-21
The DC voltage