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TROUBLESHOOTING & REPAIR
FIELD EFFECT TRANSISTOR/SWITCH BOARD TEST (continued)
TABLE F.5 – SWITCH BOARD 4 RESISTANCE TEST TABLE (Continued)
Apply | Apply |
|
|
|
|
Positive | Negative |
|
|
|
|
Test | Test |
|
|
|
|
Probe to | Probe to | Test |
| Repair | Next |
Terminal | Terminal | Result | Conclusion | Action | Procedure |
|
|
|
|
|
|
12D | 3B | Less than | OK | None | Continue |
|
| 100 ohms |
|
|
|
|
| Greater | Open | Replace 4 | Snubber |
|
| than 1K |
| Switch | Resistor |
|
| ohm |
| Boards | Test |
|
|
|
|
|
|
3B | 12D | Greater | OK | None | Continue |
|
| than 1K |
|
|
|
|
| ohm |
|
|
|
|
| Less than | Shorted | Replace 4 | Snubber |
|
| 100 ohms |
| Switch | Resistor |
|
|
|
| Boards | Test |
|
|
|
|
|
|
12D | 407 | Greater | OK | None | Continue |
|
| than 1K |
|
|
|
|
| ohm |
|
|
|
|
| Less than | Shorted | Replace 4 | Snubber |
|
| 100 ohms |
| Switch | Resistor |
|
|
|
| Boards | Test |
|
|
|
|
|
|
407 | 12D | Less than | OK | None | Continue |
|
| 100 ohms |
|
|
|
|
| Greater | Open | Replace 4 | Snubber |
|
| than 1K |
| Switch | Resistor |
|
| ohm |
| Boards | Test |
|
|
|
|
|
|
9D | 408 | Less than | OK | None | Continue |
|
| 100 ohms |
|
|
|
|
| Greater | Open | Replace 4 | Snubber |
|
| than 1K |
| Switch | Resistor |
|
| ohm |
| Boards | Test |
|
|
|
|
|
|
408 | 9D | 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).
