![](/images/new-backgrounds/1268225/26822591x1.webp)
Error | Description | Action |
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984.xx | Invalid command parameter received by the specidied | Call the next level of support. |
| device |
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990.xx | An equipment check condition has occurred in the |
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| specified device, but the device is unable to identify the |
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| exact component failure. |
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991.xx | The specified device has detected an equipment check |
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| in its system card. |
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Symptom tables
POST symptom table
Symptom | Action |
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The main motor, cooling fan, and fuser do not come | See “Cover interlock switch service check” on page |
on. |
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POST completes, but the LCD does not come on. | See “Operator panel service check” on page |
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Main motor does not come on. | See “Main motor service check” on page |
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Fan does not come on. | See “Cooling fan service check” on page |
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Fuser does not cycle. | See “Fuser service check” on page |
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Fuser does not turn on and off. | See “Fuser service check” on page |
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The paper feed picks and tries to feed media. | See “Paper feed service checks” on page |
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Note: Investigate any displayed codes before proceeding with these symptoms. For example, a missing toner cartridge will prevent POST from completing.