Lincoln Electric RED-D-ARC DX450 Service Manual page 119

F-75
CONTROL POTENTIOMETER AND MODE RESISTANCE TEST (continued)
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.
TROUBLESHOOTING AND REPAIR
TABLE F.4
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)
sweep smoothly from 10K
to 0 when OUTPUT CONTROL
is turned from Min. to Max.
sweep smoothly from 10K
to 0 when ARC CONTROL is
turned from Min. to Max.
DX450
500K or Higher
500K or Higher
500K or Higher
500K or Higher
500K or Higher
500K or Higher
* (0 Ohms)
* (0 Ohms)
* (0 Ohms)
About 10K
Ohms values should
About 10K
Ohms values should
F-75