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| Troubleshooting |
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| 5 | Troubleshooting |
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| Malfunction | Possible causes | Remedy |
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| The sensitising / desensitising | The optical sensor is dirty. | Clean the optical sensor with |
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| pulse is not triggered. |
| suitable materials (e.g. cotton |
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| wool buds). |
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| The security marker is not | The book has been placed | Slide the book through the |
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| activated / deactivated although | incorrectly. | Model 955 in the correct |
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| the sensitising / desensitising |
| position. (See below). |
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| pulse is triggered. |
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| Several books have placed on | Place the books on the Model |
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| the Model 955 simultaneously. | 955 one at a time. |
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Department. The appliance must NOT be opened. Only 3M Service Personnel are authorised to open them!If the cause of the malfunction cannot be identified, please call the 3M Service
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