Lincoln Electric Ranger 305D Service Manual page 131

F-77
CONTROL POTENTIOMETER AND MODE SWITCH RESISTANCE TEST
POT/MODE SWITCH RESISTANCE TEST
MODE SWITCH
SETTING
CC-STICK
CC-STICK
CC-STICK
CC-STICK
CC-STICK
CC-STICK
TOUCH START TIG
DOWNHILL PIPE
CV-WIRE
N/A
N/A
N/A
N/A
* Resistance should be very low, The Ohmmeter should read about the same value as
one would get by touching the two meter probes together.
If the resistance readings are not as specified in the table, replace the potentiome-
ter and mode switch plug and lead assembly, or replace the defective component.
See the Wiring Diagram.
if testing is complete, plug P7 back into the control PC board and perform the
Case Cover Replacement Procedure.
TROUBLESHOOTING & REPAIR
All manuals and user guides at all-guides.com
(continued)
TABLE F.3
OHMMETER
CONNECTION
P7-9 (#214) TO P7-14 (#218)
P7-9 (#214) TO P7-15 (#220)
P7-9 (#214) TO P7-16 (#222)
P7-14 (#218) TO P7-15 (#220)
P7-14 (#218) TO P7-16 (#222)
P7-15 (#220) TO P7-16 (#222)
P7-15 (#220) TO P7-16 (#222)
P7-14 (#218) TO P7-16 (#222)
P7-9 (#214) TO P7-16 (#222)
P7-5 (#75) TO P7-1 (#77)
P7-1 (#77) TO P7-4 (#76)
P7-6 (#279) TO P7-8 (#277)
P7-8 (#277) TO P7-7 (#278)
RANGER 305D
OHMMETER
READING
500K or Higher
500K or Higher
500K or Higher
500K or Higher
500K or Higher
500K or Higher
*
*
*
about 10K
Ohms values should
sweep smoothly from 10K
to 0 when ARC CONTROLis
turned from Min. to Max.
about 10K
Ohms values should
sweep smoothly from 10K
to 0 when ARC CONTROLis
turned from Min. to Max.
F-77