Lincoln Electric PRO-CUT 25 SVM149-A Service Manual page 61

F-27
TORCH CONTINUITY AND SOLENOID TEST (continued)
TEST
POINTS
Lead #2
To Lead #3
Lead #2 to Torch
Nozzle
Lead #3 to Torch
Nozzle
Pin 1 to Pin 2
Plug J1 (Red Leads)
Pin 1 to Pin 2
Plug J1 (Red Leads)
Pin 3 to Pin 4
Plug J1 (Gray Leads)
(LEAD 2) NZL
(LEAD 3) EL
10. Torch circuits may be measured when elec-
trode and nozzle are in place if the various cir-
cuits are isolated from each other. NZL (2),
Electrode (3), Trigger (1,2), and Torch leads (3,4)
should all measure greater than 1 Meg ohm when
checked as isolated circuits. See Figure F.10
Diagram.
TROUBLESHOOTING & REPAIR
TABLE F.1 - TORCH ASSEMBLY RESISTANCES
CIRCUIT(S) BEING
TESTED
Pilot arc
leads
Pilot arc lead to
nozzle
Pilot arc lead to
nozzle
Torch trigger circuit
Torch trigger circuit
Electrode Solenoid
Figure F.11
WRK
4
3
2
1
Harness
Plug J1
PRO-CUT 25
EXPECTED
RESISTANCE
1.5 ohms maximum
1.0 ohm maximum
1.0 ohm maximum
100K ohms minimum
1.0 ohm maximum
45 to 55 ohms
11. Replace leads and plugs previously
removed.
F-27
TEST
CONDITIONS
Torch consumables
in place
Torch consumables
in place
Torch consumables
in place
Torch trigger NOT
pulled (not activated)
Torch trigger pulled
(activated)
None