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POWER WAVE 450
F-70 F-70
TROUBLESHOOTING & REPAIR
FIELD EFFECT TRANSISTOR/SWITCH BOARD TEST (continued)
TABLE F.4 – SWITCH BOARD 3 RESISTANCE TEST TABLE (Continued)
Apply Apply
Positive Negative
Test Test
Probe to Probe to Test Repair Next
Terminal Terminal Result Conclusion Action Procedure
12C 3T Less than OK None Continue
100 ohms
Greater Open Replace 4 Snubber
than 1K Switch Resistor
ohm Boards Test
3T 12C Greater OK None Continue
than 1K
ohm
Less than Shorted Replace 4 Snubber
100 ohms Switch Resistor
Boards Test
12C 405 Greater OK None Continue
than 1K
ohm
Less than Shorted Replace 4 Snubber
100 ohms Switch Resistor
Boards Test
405 12C Less than OK None Continue
100 ohms
Greater Open Replace 4 Snubber
than 1K Switch Resistor
ohm Boards Test
9C 406 Less than OK None Continue
100 ohms
Greater Open Replace 4 Snubber
than 1K Switch Resistor
ohm Boards Test
406 9C 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).