Canon PIXMA MP800 Service Manual - Page 37

If the Stop/Reset button is pressed 3 times or more, then the ON/OFF button is pressed - black streaks

Page 37 highlights

3) In the printout, select the Pattern No. in which streaks or lines (white or black) are the least noticeable, press the Stop/Reset button the same number of time(s) as the selected Pattern No., then press the ON/OFF button. Note: - If plain paper other than the 6 kinds specified in the table in step 1) is used, select the Pattern No. 0 (zero), leave the Stop/Reset button untouched, and press the ON/OFF button. - Each time the Stop/Reset button is pressed, the Alarm LED and the COPY button light alternately, Alarm in orange and COPY in green. - If the Stop/Reset button is pressed 3 times or more, then the ON/OFF button is pressed, the machine returns to the service mode menu selection. 4) The LF correction value is written to the EEPROM, and the machine returns to the service mode menu selection. Note: The LF correction value (0, 1, or 2) can be confirmed in EEPROM information print. 1-32

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3)
In the printout, select the Pattern No. in which streaks or lines (white or black) are the least noticeable, press the Stop/Reset
button the same number of time(s) as the selected Pattern No., then press the ON/OFF button.
Note:
- If plain paper other than the 6 kinds specified in the table in step 1) is used, select the Pattern No. 0 (zero), leave the
Stop/Reset button untouched, and press the ON/OFF button.
- Each time the Stop/Reset button is pressed, the Alarm LED and the COPY button light alternately, Alarm in orange and
COPY in green.
- If the Stop/Reset button is pressed 3 times or more, then the ON/OFF button is pressed, the machine returns to the service
mode menu selection.
4)
The LF correction value is written to the EEPROM, and the machine returns to the service mode menu selection.
Note:
The LF correction value (0, 1, or 2) can be confirmed in EEPROM information print.
1-32