Lincoln Electric SVM188-A service manual Figure F.2 Control Board LEDs

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F-11		TROUBLESHOOTING AND REPAIR	F-11
	PC BOARD TROUBLESHOOTING GUIDE (continued)
		FIGURE F.2 – CONTROL BOARD LEDs
	1
(291) 8	2 (256)
	J2
(290) 7
(255) 6	5 (231)
	J3	LED1 LED3
	1 (210)

(222)12 1 LED4 LED5

LED2

J1

LED6

DC600 CONTROL G3409-1

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CONTROL BOARD

1.With the DC-600 set for the Test Conditions, all the LEDs except LED 4 should be lit.

2.LED 1 indicates the 120vac input to the Control Board and should be ON whenever the Power Switch is ON. If not check for voltage at leads 255 & 256 (J2- pin 6 & pin 3). If there is no voltage, check the wiring from the input power circuit. See the Wiring Diagram.

3.LED 2 indicates presence of Arc Voltage feedback to the Control Board and should be ON. LED 2 increases in brilliance as the arc voltage increases. If not ON check the voltage at leads 210+ (J3-pin1) to lead 222- (J1-pin12).

4.LED 3 indicates that power is being applied to the Fault Protection relay (CR-2) and should be ON whenever the Power Switch is ON. Under a “fault” condition, LED 3 will go OFF and LED 4 will turn ON. See Protective Devices and Shutdown Circuits.

5.LED 4 indicates an overload or “fault” condition and is normally OFF. If it comes ON, the input contactor (CR-1) will open and the machine will shut down. The Power Switch must be turned OFF and back ON to reset the welder. See Protective Devices and Shutdown Circuits.

6.LED 5 indicates a DC control signal to the Firing Board is present at lead 231 (J2-pin5). LED 5 will vary in brilliance as the Control Potentiometer is changed getting dimmer as output is increased (opposite of LED 2)

NOTE: LED 5 will be very dim or OFF in CC (Stick) Mode until a load is applied (arc struck).

7.LED 6 indicates a signal from the Firing Board that a ‘trigger’ has been applied. LED 6 should be ON whenever there is a closure of the 2 & 4 circuit. See Firing Board information regarding LED 10.

DC-600