Lexmark MB790MFP Service Manual page 113

7462
Error
code or
message
842.xx ADF communication
failure
843.xx Scanner carriage
mechanical failure
844.xx Scanner exposure
lamp failure
845.xx Scanner CCD failure
849.00 Missing a hard drive
849.01 Hard drive installed
erroneously
900.xx System software error
901xx System software error
2-76
Service Manual
Error contents
The ADF controller card has
lost communication with the
system.
The scanner carriage home
position detection has failed.
The flatbed scanner exposure
lamp has failed.
Machine is missing a hard
drive.
Machine has an installed hard
drive that should not be
present.
Code detected unusual event
or timing.
Code detected unusual event
or timing.
Description/Action Possible repair actions
1. Check all connections on the
ADF controller card assembly.
2. Replace the ADF controller
card assembly if problem
remains.
Go to "ADF controller card
removal" on page 4-67.
1. Turn the machine off/on.
2.See "Sensor (scanner HP)
service check" on
page 2-150.
Replace the exposure lamp.
Go to "Scanner / ADF duplex
CCD exposure lamp
removal" on page 4-147.
Install the hard drive.
Uninstall the hard drive.
1. POR the machine and print
a simple test page to
determine if the problem is
system software related, or
if the customer is sending a
corrupted print job.
2. Check all connections on
the system card assembly.
3. Replace the system card
assembly if problem
remains. Go to "System
card assembly removal"
on page 4-50.
1. POR the machine and print
a simple test page to
determine if the problem is
firmware related, or if the
customer is sending a
corrupted print job.
2. Check all connections on
the system card assembly.
3. Replace the system card
assembly if problem
remains. Go to "System
card assembly removal"
on page 4-50.
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