Return to Section TOC
Return to Section TOC
Return to Section TOC
Return to Section TOC
Return to Master TOC
Return to Master TOC
Return to Master TOC
Return to Master TOC
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).
