Lincoln Electric LN-25 SVM114-C - Manual (Page 55)

TROUBLESHOOTING AND REPAIR F-17 F-17
LN-25™
690
691
512 500
555 667
621
J1 J3 J4 J2
2. C h e ck fo r t h e p r e s e n c e o f t h e D C vo l t a g e
applied from plug J1 pin 1 (667+) to plug J1 pin
3 621(-). See Figure F.8.or F.8.a.
3. Check for the presence of 5 to 6 VDC from lead
6 9 0 ( + ) t o l e a d 6 9 1 ( - ) a t s o l e n o i d va l ve.
The LN-25™ trigger circuit must be activated
or the purge button must be pressed.
4. If the above voltage reading is not correct at the
solenoid valve, check for 5 to 6VDC at plug J2
pin 3 lead 690(+) & pin 6 lead 691 (-). See
Figure F.8.
5. If the above voltage check is not correct, the
control board 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
NOTE: Machines with Codes above 10100 that
have been upgraged to the L12253-[ ]
Control boardhave thesme connection
points ad shown in Figure F.8 for the
supply and solenoid voltages
GAS SOLENOID VALVE AND CONTROL PC BOARD TEST
(FOR CODES ABOVE 10500 ONLY)
(continued)
FIGURE F.8. – CONTROL PC BOARD.
G3425
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