Lincoln Electric LN-25 Service Manual page 49

F-11
GAS SOLENOID VALVE AND SOLENOID PC BOARD TEST (continued)
FIGURE F.4 – PC BOARD FOR K430-1 GAS SOLENOID KIT.
M15202 M15202
606
624A
512
2. Check for the presence of the DC voltage
applied from lead 624A(+) to lead 621(-). See
Figure F.4
3. Check for the presence of 12 VDC from lead
512(+) to lead 621(-).
4. Check for the presence of 10 VDC from lead
606(+) to lead 621(-). When the LN-25™ trigger
circuit is activated, the voltage should drop to
about 1 VDC.
5. If the above voltage readings are good and the
solenoid valve is functional, the Solenoid PC
Board may be faulty.
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TROUBLESHOOTING AND REPAIR
PC BOARD FOR K430 GAS SOLENOID KIT.
512 512
624A 624A
621 621 621
621
6. If the above voltage checks are not correct, the
control board, contactor board (if used), remote
control board (if used) and/or wiring harness
may be faulty. Refer to the wiring diagrams in
the Electrical Diagrams Section.
The appropriate jumper plugs may be used to
isolate and check suspect contactor or remote
control boards.
LN-25™
F-11
621
J11 J11 J11