Sequence of operation
The microprocessor (CPU) on the ECU controls the operation sequence of the product. The following
events take place during normal product operation:
Sequence of operation, scanner
Table 5-1 Basic sequence of operation, scanner
Period Purpose Remarks
WAIT. After the product is turned on until
Ready appears on the control-panel
display.
To perform the firmware initialization. Tests RAM and establishes and
communication with the control panel.
READY. From the end of the WAIT
period until the user initiates an action or
a fax is received.
To keep the product ready to print, copy,
scan, or fax.
CALIBRATION. From the time the copy,
scan, or fax button is pressed until the
STAGE period.
To compensate for variables in the
scanning system.
This occurs before media moves past the
scanner.
STAGE. From the end of the
CALIBRATION period until the SCAN
period.
To position the leading edge of the
original document at the scanning
position.
The page feeds partway into the
scanner, and then briefly stops.
SCAN. From the end of the brief pause
during the STAGE period until the
EJECT or following-page STAGE
period.
To scan one page of the original
document.
Another STAGE period follows if another
page of the original document is present
in the ADF. Otherwise, the EJECT period
begins.
EJECT. From the end of the SCAN
period until the original document page is
completely ejected from the scanner.
To clear the last page of the original
document from the scanner.
The product returns to the READY period
at the end of the EJECT period.
ENWW Basic operation 39
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