Brother MFC640CW Service Manual page 246

28th) Total power-ON time
29th) Error code of the most recent machine error*
30th) Flat-bed page count, indicating how many documents have been scanned
31st) Error code of the most recent communications error*
32nd) ADF page count, indicating how many pages the ADF has been fed
33rd) ADF paper jam count, indicating how many times a paper jam has occurred
If you press the Mono Start key, the screen goes back to the calendar clock in step (1) above.
(3) To stop this operation and return to the machine to the initial stage of the maintenance mode,
press the Stop/Exit key.
1
* To check each of the four ink cartridges, press the Set key. Pressing the key cycles through black,
yellow, cyan, and magenta.
2
* When a machine error code is displayed, pressing the Set key cycles through recent nine errors that
have occurred.
3
* When a communications error code is displayed, pressing the Set key cycles through the latest error,
2nd latest error, and 3rd latest error.
2
3
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