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TROUBLESHOOTING & REPAIR
F-65 F-65
COMMANDER 300
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CONTROL INPUT TEST (continued)
14. Using an ohmmeter, measure continuity at J4
in the following switch positions. See Table
F.3 below.
15. If continuity fails or is intermittent in any of the
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
CV
60A
90A
150A
230A
300A
CC
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
MIN
MIN
MIN
MIN
MIN
MIN
MAX
MAX
MAX
MAX
MAX
MAX
MAX
RANGE SEL. SWITCH POS.
CV
60A
90A
150A
230A
300A
CC
CV
60A
90A
150A
230A
300A
CC
VOLT
AGE
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.