above switch positions, check for continuity
and poor connections on all leads from the
switch back to the control board. Check for
loose or faulty connections in molex connec-
tors.

16. Plug J4 back into the control PC board.

17. Locate and disconnect J3 at the control PC

board. See Figure F.30.

18. Set the control dial to the minimum position,

set the Arc Force dial to the minimum posi-
tion, and set the Local/Remote switch in the
“Local” position.

19. Using an ohmmeter, measure 10K from J3

pin 7 to J3 pin 8.

20. Using an ohmmeter, measure the resistance

from J3 pin 7 to J3 pin 16. See Figure F.31.
The resistance on the ohmmeter should
increase from 0 ohms to 10K uniformly as the
control dial is turned clockwise from minimum
to maximum.

21. If the resistance check in step 19 & 20 fails,

check for continuity and poor connections on
all 75, 76, and 77 leads from the potentiome-
ter back to the control board. See the Wiring
Diagram. Look closely for broken molex pins.

22. Check the Local/Remote switch for continuity.

23. If all the leads and the Local/Remote switch

check ok, the control potentiometer is bad.
Replace.

RANGE SEL. SWITCH POSITION

60A

90A

150A

230A

300A

CONTINUITY FROM

J4 pin 1 to 9

J4 pin 1 to 6

J4 pin 1 to 2

J4 pin 1 to 5

J4 pin 1 to 7

J4 pin 1 to 8

J4 pin 1 to 10

CONTROL DIAL POSITION

MIN

MAX

RANGE SEL. SWITCH POS.

60A

90A

150A

230A

300A

60A

90A

150A

230A

300A

VOLTAGE

1.223-1.299 VDC

.553-.587 VDC

.844-.896 VDC

1.162-1.234 VDC

1.524-1.618 VDC

1.868-1.984 VDC

.319-.339 VDC

4.799-5.095 VDC

1.085-1.153 VDC

1.660-1.762 VDC

2.285-2.427 VDC

2.998-3.184 VDC

3.669-3.895 VDC

3.870-4.110 VDC

Table F.3.

Table F.2.