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| 9. TROUBLESHOOTING GUIDE |
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| Problem |
| Possible Cause |
| Solution |
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| 1. Digital readout dead. | 1. Main AC power OFF. | 1. | Turn ON. | |
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| 2. | Main fuse(s) or control fuse blown. | 2. | Replace fuse(s). |
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| 3. | Circuit board not plugged in. | 3. | Plug in. |
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| 4. | Bad circuit board. | 4. | Replace circuit board. |
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| 5. | Power supply not working. | 5. | Put in new power supply. |
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| 2. Digital readout is not lit. | 1. Digital panel meter bad. | 1. | Replace the DPM. | |
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| All control functions are |
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| working. | 2. Open or loose wire feeding the digital | 2. | Repair. | |
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| panel meter. |
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| 3. | Circuit board trouble. | 3. | Replace circuit board. |
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| 3. Moisture readings are | 1. Moisture on sensor blade. | 1. | Dry OFF the sensor. | |
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| very high - grain checks |
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| dry. | 2. Foreign object jammed on sensor. | 2. | Remove object. | |
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| 3. | Water in circuit board jack. | 3. | Dry OFF. |
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| 4. | Calibration accidentally set too high. | 4. | Reset. |
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| 5. | Sensor not grounded to the tube. | 5. | Secure ground strap. |
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| 6. | Bad circuit board. | 6. | Replace circuit board. |
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| 7. | Bad sensor. | 7. | Replace sensor. |
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| 8. | Circuit board dip switches set wrong. | 8. | Set switches using did switch |
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| chart - page 45. |
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| 4. Erratic operation after | 1. Dip switches on new card are not | 1. | Refer to illustration on page 45. | |
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| replacing the control |
| see correctly. |
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| card. |
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| 5. Moisture readings do | 1. Sensor leads are broken or not hooked | 1. | Tighten terminal screws or replace | |
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| not change, |
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| the sensor. |
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| temperature readings |
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| are high negative. | 2. Sensor trouble. | 2. | Replace sensor. | |
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| 6. Moisture readings are | 1. Check for the sensor ground strap not | 1. | Hook up strap. | |
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| intermittently high then |
| hooked up. |
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| low. | 2. | Sensor cable leads broken. | 2. | Replace sensor. |
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| 3. | Loose terminal leads where sensor is | 3. | Tighten screws. |
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| hooked. |
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| 7. Moisture readings are | 1. Correct by calibration adjustment, | 1. | Adjust. | |
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| consistently high or low. | refer to Page 18. |
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| 8. Blowing control fuses. | 1. Check for loose or shorted wires. | 1. | Isolate and correct. | |
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| 2. | Surge absorber shorted. | 2. | Replace if it looks bad. |
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| 3. | Any component that is bad can cause | 3. | Replace bad component. |
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| this - check by isolating one component |
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| at a time. |
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38 |
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