Lincoln Electric IDEALARC DC-655 Service Manual page 81

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FIGURE F.16 – THERMAL FAN/SNUBBER BOARD AND FIRING BOARD PLUG LOCATIONS
TEST PROCEDURE
1. Disconnect the main AC input power to the
machine.
2. Locate and disconnect plug J9 from the
thermal fan/snubber board and plug J5 from
the firing board. See Figure F.16.
TROUBLESHOOTING & REPAIR
ACTIVE SCR TEST (continued)
L10124-[ ]
THERMAL FAN / SNUBBER
LED2
LED6
LED5 LED4
LED1
LED3
PLUG J20
LED7 LED8 LED9
LED2
LED1
LED4
LED3
LED6
LED5
IDEALARC DC-655
PLUG J9
J5
G2699-[ ]
J6
LED10
J7
J4
FIRING BOARD
3. Remove the red insulating paint from the
heat sink test points. See Figure F.17. DO
NOT DISASSEMBLE THE HEAT SINKS.
F-39