Lexmark Pro5500 Series, Service Manual

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Diagnostic information
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Duplex unit missing service check
4 Turn off the printer by unplugging the power cord.
Visually check the Pressure Release Arm (PRA) lift for
any damage. Manually turn the gear clockwise until it
lifts the pressure arms, and it goes back to its original
position.
Can the gear turn 360 degrees?
Go to step 5. Go to step 8.
5 Check the pressure arm and pressure arm roll for any
damage.
Is the pressure arm assembly free from any
damage?
Go to step 6 Go to step 8.
6 Check if the PRA assembly will initialize during POST.
Does the PRA assembly initialize during POST?
Go to step 7. Go to step 8.
7 Replace the duplex unit. See “Duplex unit removal”
on page 4-11 .
Does the problem remain?
Go to step 8. Problem resolved
8 Replace the system board. See “System board
removal” on page 4-32 .
Does the problem remain?
Go to step 9. Problem resolved
9 Replace the print engine assembly. See “Print engine
assembly removal” on page 4-84 .
Does the problem remain?
Replace the
printer. Problem resolved
Step Check Yes No
1 Check the duplex unit for any damage.
Is the duplex unit free from any damage?
Go to step 2. Go to step 3.
2 Check the following conditions on the duplex unit:
• Voltage between the duplex terminals is +3V.
• Metal contacts on the duplex unit is in contact with
the terminals.
• Duplex terminals are not bent or damaged.
Reseat the J31 cable on the system card.
Are the terminals free from any damage and reads
+3V?
Go to step 4. Go to step 5.
3
Replace the duplex unit. See “Duplex unit removal” on
page 4-11 .
Does the problem remain?
Go to step 4. Problem resolved
4
Replace the system board. See “System board
removal” on page 4-32 .
Does the problem remain?
Go to step 5. Problem resolved
5
Replace the print engine assembly. See “Print engine
assembly removal” on page 4-84 .
Does the problem remain?
Replace the
printer. Problem resolved
Step Check Yes No