2-76 Service Manual
7462
842.xx ADF communication
failure
The ADF controller card has
lost communication with the
system.
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 4-62.
843.xx Scanner carriage
mechanical failure
The scanner carriage home
position detection has failed.
1. Turn the machine off/on.
2.See “Sensor (scanner HP)
service check” on
page 2-150.
844.xx Scanner exposure
lamp failure
The flatbed scanner exposure
lamp has failed.
Replace the exposure lamp.
Go to “Scanner / ADF duplex
CCD exposure lamp
removal” on page 4-143.
845.xx Scanner CCD failure The scanner CCD has failed. Replace the Scanner CCD
assembly.
Go to “Scanner CCD
assembly removal” on
page 4-88.
849.00 Missing a hard drive Machine is missing a hard
drive.
Install the hard drive.
849.01 Hard drive installed
erroneously
Machine has an installed hard
drive that should not be
present.
Uninstall the hard drive.
900.xx System software error Code detected unusual event
or timing.
Go to “System software error
(900.xx) service check” on
page 2-151.
901xx System software error Code detected unusual event
or timing.
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 4-47.
902.xx System software error Code detected unusual event
or timing.
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 4-47.
Error
code or
message
Error contents Description/Action Possible repair actions
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