Lincoln Electric IDEALARC DC-655 Service Manual page 60

F-18
FIGURE F.4 – FIRING BOARD TRIGGER CIRCUIT TEST POINTS AND LEDs
LED7
TEST PROCEDURE
1. Disconnect the AC input power to the DC-
655 machine.
2. Locate the firing board on the left side of
the control box.
3. Perform a visual inspection on the firing
board to see if there are any loose or faulty
connections or physical damage.
4. Connect the correct AC input power to the
DC-655.
TROUBLESHOOTING & REPAIR
FIRING BOARD TEST (continued)
LED8 LED9
LED1 LED2
LED3 LED4
LED6
LED5
IDEALARC DC-655
(205) 8
(206) 7
(207) 6
(208) 5
4
3
G2699-[ ]
2
1
LED10
FIRING BOARD
WARNING
ELECTRIC SHOCK
• Do not touch electrically hot
parts.
5. Turn the power switch (SW1) to the ON
position.
6. LEDs 7, 8 and 9 should be lit and equally
bright. See Figure F.4 to locate the LEDs.
Use Table F.1 to check operation of LEDs 7,
8, and 9. The three LEDs should be of
equal intensity.
F-18
J5
16 (204)
15 (203)
14
13 (231)
12 (215)
11
10
9
J6
J7
J4
can kill.