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POWER WAVE 450
F-67 F-67
TROUBLESHOOTING & REPAIR
FIELD EFFECT TRANSISTOR/SWITCH BOARD TEST (continued)
TABLE F.3 – SWITCH BOARD 2 RESISTANCE TEST TABLE
Apply Apply
Positive Negative
Test Test
Probe to Probe to Test Repair Next
Terminal Terminal Result Conclusion Action Procedure
2B 12B Greater OK None Continue
than 1K
ohm
Less than Replace 4 Snubber
100 ohms Shorted Switch Resistor
Boards Test
12B 2B Less than OK None Continue
100 ohms
Greater Open Replace 4 Snubber
than 1K Switch Resistor
ohm Boards Test
9B 1B Greater OK None Continue
than 1K
ohm
Less than Shorted Replace 4 Snubber
100 ohms Switch Resistor
Boards Test
1B 9B Less than OK None Continue
100 ohms
Greater Open Replace 4 Snubber
than 1K Switch Resistor
ohm Boards Test
2B 9B Less than OK None Continue
100 ohms
Greater Open Replace 4 Snubber
than 1K Switch Resistor
ohm Boards Test
9B 2B Greater OK None Continue
than 1K
ohm
Less than Shorted Replace 4 Snubber
100 ohms Switch Resistor
boards Test
NOTE: K ohm = ohm reading multiplied by 1000.
NOTE: Always make sure that all four Switch Boards are changed at the same time. Never mix
an old style (different part number) Switch Board with a new style (new part
number).