Lincoln Electric SVM112-B service manual See Arc Start

Return to Section TOC

Return to Section TOC

Return to Section TOC

Return to Section TOC

Return to Master TOC

Return to Master TOC

Return to Master TOC

Return to Master TOC

F-204 F-204

TROUBLESHOOTING & REPAIR

PRE-POWERUP SWITCH BOARD TEST PROCEDURE

FOR REPLACEMENT OF SWITCH ASSEMBLY G2402-2 (continued)

FIGURE F.80 - PC BOARD RECEPTACLE

P23

2

3

5

6

1.	Unplug P23 and insert jumper plug into PC		5.	Turn ON the arc start switch.			See Arc Start
	board receptacle. See Figure F.80.			PW450 with wire Feeder or Figure				F.79.
2.	Turn ON the preset power switch. See		6.	Attach the oscilloscope probes to each of the
	Figure	F.78.		following eight test points.			Each	test point
3.	Press	the MANUAL PROCEDURE ENTRY		should	look like the oscilloscope			picture in
				Figure	F.81.
	(64) key on the Calibration & Test overlay and
	using the arrow keys (100) and (101) change
						WARNING
	the Power Wave to “Process 1 Setup 1-1”
	mode.		ALL METERS AND OSCILLOSCOPES MUST
4.	Set the Oscilloscope for:		BE ELECTRICALLY ISOLATED (isolation trans-
	20 V/div.		former).
	20 uS/div.

POSITIVE PROBE	NEGATIVE PROBE
#1 P40 pin 14	P40 pin 16
#2 P40 pin 9	P40 pin 11
#3 P40 pin 6	P40 pin 8
#4 P40 pin 1	P40 pin 3
#5 P41 pin 15	P41 pin 16
#6 P41 pin 9	P41 pin 10
#7 P41 pin 7	P41 pin 8
#8 P41 pin 1	P41 pin 2

POWER WAVE 450