Lexmark MB790MFP Service Manual page 154

Step
2 Check the original document condition.
Is the original document free of paper clips and staples as
well as damage such as creases, tears, holes or excessive
wear?
3 Check the media path for contaminates.
Is the media path free of excess media dust and foreign
objects such as paper clips and staples?
4 Check the sensor (ADF sheet through) for proper operation.
1. Enter the Diagnostics Menu.
2. Touch SCANNER TESTS.
3. Touch Sensor Tests.
4. Observe the line "sensor (ADF sheet through)"
Does the display on the operator panel, change every time
the sensing area of the above sensor is interrupted or
blocked?
5 Check the sensor (ADF sheet through) for proper
connection.
Is the above component properly connected?
6 Check the ADF feed drive motor assembly for proper
connection.
Is the above component properly connected?
7 Check the ADF transport drive motor assembly for proper
connection.
Is the above component properly connected?
8 Place an undamaged document in the ADF, and perform a
ADF test.
Does the error remain?
9 Perform a print test using the ADF.
Does the problem remain?
Check Yes No
Go to step 3. Remove damaged
original document
and replace with a
new undamaged
original document.
Perform a ADF
test. If the problem
remains, go to
step 2.
Go to step 4. Remove all
contaminates from
the media path.
Go to step 6. Go to step 5.
Replace the Replace the
sensor (ADF connection.
sheet through).
Go to "Sensor
(ADF sheet
through)
removal" on
page 4-82.
Replace the ADF Replace the
feed drive motor connection.
assembly.
Go to "ADF feed
drive motor
assembly
removal" on
page 4-77.
Replace the ADF Replace the
transport drive connection.
motor assembly.
Go to "ADF
transport drive
motor bracket
assembly w/
cable removal"
on page 4-77.
Replace the ADF Problem solved.
controller card
assembly.
Go to "ADF
controller card
removal" on
page 4-67.
Go to step 11.
Contact next Problem solved.
highest level of
tech support.
Diagnostic information
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