| FRU OR PROCEDURE | ACTION |
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2 | Paper Feed Motor | A noisy or chattering motor or a motor |
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| that fails to turn, can be caused by: |
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| • An open or short in the motor |
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| • An open or short in the motor driver |
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| on the system board |
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| • A bind in the paper feed mechanism |
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| Check for 100 ohms (±20 ohms) |
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| between the following pins on the |
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| motor: |
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| Pin 1 to Pin 4 |
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| Pin 2 to Pin 4 |
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| Pin 3 to Pin 5 |
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| Pin 3 to Pin 6 |
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| If the readings are incorrect, replace |
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| the motor. Check for motor pins |
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| shorted to the motor housing. If you |
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| find a shorted pin, replace the motor. |
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| If the failure remains, replace the sys- |
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| tem board. |
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| Although the paper feeds in a forward |
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| direction only, the paper feed motor |
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| turns in two directions. If the paper |
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| feed motor turns in one direction only, |
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| replace the system board. Binds in |
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| the paper feed motor or gear train can |
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| cause intermittent false paper jam |
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| errors. Remove the paper feed motor |
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| and check the shaft for binds Also |
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| check for loose or worn motor gear |
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3 | Gears | Check for binds in the gear train and |
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| paper feed mechanism. To do this, |
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| rotate the largest gear by hand. If you |
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| notice a bind isolate it by removing |
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| the small idler gear on the outside of |
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| the right side plate. Replace any worn |
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| or binding gears, rollers, or bearings. |
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Diagnostic Information 15
