Lexmark C77X, Service Manual

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Diagnostic aids
3-19
5061
DUPLEX TESTS
Duplex Quick Test
This test verifies if the Duplex Option Top Margin is set correctly. This test prints a duplexed version of the Quick
Test Page that can be used to adjust the Top Margin for the back of the duplexed page. You can run one
duplexed page (
Single ) or continue printing duplexed pages ( Continuous ) until Back ( ) or Stop ( ) is
pressed.
You must use either Letter or A4 paper.
To run the Duplex Quick Test:
1.
Select Duplex Quick Test from DUPLEX TESTS in the Diagnostics mode.
2.
Select Single or Continuous .
•
The single Duplex Quick test cannot be canceled.
•
The printer attempts to print the Quick Test Page from the default paper source. If the default paper
source only supports envelopes, then the page is printed from Tray 1.
•
Check the Quick Test Page for the correct offset between the placement of the first scan line on the
front and back side of a duplexed sheet.
•
If adjustment is necessary, the Top Margin in the Registration menu must be adjusted first. The
Duplex Top Margin Offset may be adjusted next.
•
A positive offset moves the text down the page and widens the top margin, while a negative offset
moves the text up the page and narrows the top margin.
3.
Press Back ( ) or Stop ( ) to exit the test.
Duplex Top Margin Offset
Modification of this setting controls the offset between the placement of the first scan line on the front and back
side of a duplex sheet.
Changing the value by 1 unit moves the margin by 1/100 inches. A positive value moves the text down the page
and widens the top margin. A negative value moves the text up the page and narrows the top margin.
Duplex Sensor Test
This test determines whether or not the duplex sensors and switches are working correctly.
1.
Select Sensor Test from DUPLEX TESTS in the Diagnostics mode.
2.
Select the sensor to test:
Duplex input sensor
Duplex exit sensor
3.
Manually actuate the duplex sensors. When the sensor/switch is closed,
Closed
displays, when the
sensor/switch is open,
Open
displays.
4.
Press Back ( ) or Stop ( ) to exit the test.