Lincoln Electric INVERTEC POWER WAVE 450 SVM112-B Service Manual page 264

F-204
PRE-POWERUP SWITCH BOARD TEST PROCEDURE
FOR REPLACEMENT OF SWITCH ASSEMBLY G2402-2 (continued)
1. Unplug P23 and insert jumper plug into PC
board receptacle. See Figure F.80.
2. Turn ON the preset power switch.
Figure F.78.
3. Press the MANUAL PROCEDURE ENTRY
(64) key on the Calibration & Test overlay and
using the arrow keys (100) and (101) change
the Power Wave to "Process 1 Setup 1-1"
mode.
4. Set the Oscilloscope for:
20 V/div.
20 uS/div.
TROUBLESHOOTING & REPAIR
FIGURE F.80 - PC BOARD RECEPTACLE
P 23
2
3
5
6
See
POSITIVE PROBE
#1 P40 pin 14
#2 P40 pin 9
#3 P40 pin 6
#4 P40 pin 1
#5 P41 pin 15
#6 P41 pin 9
#7 P41 pin 7
#8 P41 pin 1
POWER WAVE 450
5. Turn ON the arc start switch. See Arc Start
PW450 with wire Feeder or Figure F.79.
6. Attach the oscilloscope probes to each of the
following eight test points.
should look like the oscilloscope picture in
Figure F.81.
WARNING
ALL METERS AND OSCILLOSCOPES MUST
BE ELECTRICALLY ISOLATED (isolation trans-
former).
NEGATIVE PROBE
P40 pin 16
P40 pin 11
P40 pin 8
P40 pin 3
P41 pin 16
P41 pin 10
P41 pin 8
P41 pin 2
F-204
Each test point