Lincoln Electric IM887 manual Motor Check, Testing the Potentiometer, Testing the Trigger Switch

	MAGNUM 250 LX
Troubleshooting Guide
TESTING THE TORCH
Motor Check.	Remove the torch connector from the cabinet.
	Using the torch Control Cable Connector, check the resistance across pins “A”
	and “B” (motor leads). The resistance across the motor should be between 5-10
	ohms. If an open circuit or short exist, check the motor leads and motor
	independently.
Testing the Potentiometer.	Using the torch Control Cable Connector, check the resistance across pin “D”
	(wiper) and pin “C”. The resistance should vary from 5K - 0 ohms.
	Check the resistance across pin “D” (wiper) and pin “G”. The resistance should
	vary from 5K - 0 ohms.
Testing the Trigger Switch.	Using the torch Control Cable Connector, check for continuity across pins “E”
	and “F” when the trigger is pressed.

E

F

D

G

A

C

B

"W" CLOCKED CONNECTOR

(VIEWED FROM FRONT OF CONNECTOR)

			TORCH
	RED	FUNCTIONS
A		+	-	TORCH
B	BLACK		5K 3	MOTOR
	WHITE	1		CW
G
	GREEN		2	TORCH
D				POT
	BLUE
C
E	BROWN			TORCH
	YELLOW/ORANGE			TRIGGER
F

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