Lincoln Electric DC-655 Internal Trigger Circuit Test, Test Procedure, Trigger Diagram

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F-14 F-14

TROUBLESHOOTING & REPAIR

INTERNAL TRIGGER CIRCUIT TEST (continued)

FIGURE F.1 – FIRING BOARD TRIGGER CIRCUIT TEST POINTS AND LEDS

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LED7 LED8 LED9

LED1LED2

G2699-[ ]

LED10

LED3LED4

LED6

LED5

8	J5	16
7		15
6		14
5		13
4		12
3		11
2		10
1		9

J6

J7

J4

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FIRING BOARD

2. If LED 10 does not light when the trigger cir-

WARNINGcuit is activated, proceed with the following voltage and continuity checks.

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ELECTRIC SHOCK can kill.

• Do not touch electrically hot parts.

TEST PROCEDURE

1.With the correct input power applied to the DC-655 and the trigger circuit activated, LED 10 on the firing board should be lit. See Figure F.1. If LED 10 lights when the trigger is activated, the wiring and circuitry to the firing board is good. Perform the Firing Board Test and see the Control Board LED Chart. See the Simplified

Trigger Diagram.

NOTE: LED 10 should not be lit if the trigger circuit is not activated.

3.Check the 10 Amp circuit breaker. It is the one closest to the 115V duplex receptacle. Reset if tripped.

IDEALARC DC-655