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TROUBLESHOOTING & REPAIR
F-205 F-205
POWER WAVE 450
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PRE-POWERUP SWITCH BOARD TEST PROCEDURE
FOR REPLACEMENT OF SWITCH ASSEMBLY G2402-2 (continued)
SNUBBER SIGNAL TEST
1. Adjust the grid for a “light” load.
2. Turn ON the variable AC supply applied to the
primary circuit. See Figure F.76.
3. Slowly increase the voltage until the filter
capacitor voltage is 25VDC. See Figure
F.77.
4. Adjust the grid load to get 5 amps output from
the Power Wave. DO NOT PULL MORE
THAN 7-8 AMPS OUTPUT FROM THE
POWER WAVE.
5. Set the Oscilloscope for:
5 V/div/
20 uS/div.
6. Attach the oscilloscope to each of the follow-
ing eight test points. Each test point should
look like the oscilloscope picture in Figure
F.82.
ALL METERS AND OSCILLOSCOPES MUST
BE ELECTRICALLY ISOLATED Isolated
Transformer).
FIGURE F.81 - FET DRIVE SIGNAL
WARNING
POSITIVE PROBE
R1 12E or 12L
R2 402
R3 12F
R4 404
R5 405
R6 406
R7 12H
R8 408
NEGATIVE PROBE
401
9E or 9L
403
9F
12G or 12M
9G or 9M
407
9H
Turn the variable AC primary supply to zero
volts and then turn it OFF. See Figure F.76.
Once the filter capacitor voltage drops to zero,
turn the arc start switch OFF. See Figure F.79.
0 V
20V/Div
20uS/Div