Canon MP970 Service Manual page 39

<Left margin correction>
Adjust the left margin for duplex printing or printing from the cassette.
1) Duplex printing from the rear tray and cassette
In the left margin correction mode, press the Stop/Reset button 1 time, then press the ON/OFF button 1 time. Duplex printing is
performed from the rear tray and cassette.
Number of times the Stop/Reset button is pressed
From each paper source (rear tray and cassette), 2 sheets of paper are ejected. The first sheet is blank, and the left margin
correction pattern is printed on the second sheet.
<Printing sequence>
For detail, see the flowcharts below.
i. A sheet of paper feeds from the rear tray, and ejected blank (single-sided printing).
ii. A sheet of paper feeds from the rear tray. Nothing is printed on the front side, and the pattern is printed on the back side (duplex
printing).
iii. A sheet of paper feeds from the cassette, and ejected blank (single-sided printing).
iv. A sheet of paper feeds from the cassette. The pattern is printed on both sides of paper (duplex printing).
A total of 4 sheets are ejected.
After this, set the correction value to the EEPROM in the steps below.
2) Selection of the parameter mode for left margin correction
Press the Stop/Reset button the specified number of time(s) according to the parameter mode listed in the table below, then press
the ON/OFF button.
Each time the Stop/Reset button is pressed, the Alarm and Power LEDs light alternately, Alarm in orange and Power in blue.
Number of times the Stop/Reset button
is pressed (M)
0 times
1 time
2 times
3 times
4 times or more
3) Setting of the left margin correction value ("+" means to increase the left margin)
Press the Stop/Reset button the specified number of time(s) according to the correction value listed in the table below, then press
the ON/OFF button.
Number of times the Stop/Reset
button is pressed (N)
0 times
1 time
2 times
3 times
4 times
5 times
6 times
7 times or more
After the value is set, the machine returns to the parameter mode selection. Repeat steps 2) and 3) to adjust the left margin in each
parameter mode: "back side of paper fed from the rear tray," "front side of paper fed from the cassette," and "back side of paper fed
from the cassette."
4) After the left margin correction in all the parameter modes is completed, press the Stop/Reset button 4 times or more in the
parameter mode selection, then press the ON/OFF button to return to the service mode menu selection.
(L)
0 times
1 time
2 times
Duplex printing from the rear tray and cassette
Back side of paper fed from the rear tray
Front side of paper fed from the cassette
Back side of paper fed from the cassette
Return to the service mode menu selection (after writing to the EEPROM)
Return to the parameter mode selection for left margin correction
+1 pitch
+2 pitches
+3 pitches
-1 pitch
-2 pitches
-3 pitches
Return to the service mode menu selection (no writing to the EEPROM)
No operation
Duplex printing from the rear tray and cassette
Return to the service mode menu selection (no writing to the
EEPROM)
Parameter mode
Left margin correction value
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Operation