Lexmark 3350 Service Manual - Page 33

PictBridge service check, Maintenance station service check, System board removal on,

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PictBridge service check 4479-XXX FRU PictBridge Card Action Check system board connector J11 for approximately 9 V dc on pin 1. If the voltage is incorrect, replace the system board. Go to "System board removal" on page 4-17. If the voltage is correct but the problem remains, replace the scanner module assembly. Go to "Scanner module assembly removal" on page 4-10. Maintenance station service check The maintenance station has three functions: 1. Wipes (cleans) the printhead nozzle plates 2. Provides a place for printheads to fire all nozzles, keeping them clear for printing 3. Seals the printheads when they are not being used to prevent the nozzles from drying FRU Maintenance Station Assembly Action As the carrier moves to the left over the maintenance station, a slot on the bottom of the carrier engages a tab on the sled of the maintenance station, causing the cap to rise and seal the printheads. When the carrier moves to the right, it uncaps the printheads. The wipers clean the printhead nozzle plates as the carrier leaves the maintenance station. The wipers clean the printheads only when the carrier is moving to the right. After the cleaning operation is complete, a tab on the maintenance station engages a tab on the carrier, causing the wipers to lower. Worn wipers can cause poor print quality after printhead cleaning. Check for loose or worn wipers. Worn caps cause the printhead nozzles to dry and clog. Check for loose or worn caps. If any worn or broken parts are found, replace the maintenance station. Go to "Maintenance station removal" on page 4-18. Diagnostic information 2-15

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4479-XXX
Diagnostic information
2-15
PictBridge service check
Maintenance station service check
The maintenance station has three functions:
1.
Wipes (cleans) the printhead nozzle plates
2.
Provides a place for printheads to fire all nozzles, keeping them clear
for printing
3.
Seals the printheads when they are not being used to prevent the
nozzles from drying
FRU
Action
PictBridge
Card
Check system board connector J11 for approximately
9 V dc on pin 1. If the voltage is incorrect, replace the
system board. Go to
“System board removal” on
page 4-17
. If the voltage is correct but the problem
remains, replace the scanner module assembly. Go to
“Scanner module assembly removal” on page 4-10
.
FRU
Action
Maintenance
Station
Assembly
As the carrier moves to the left over the maintenance
station, a slot on the bottom of the carrier engages a tab
on the sled of the maintenance station, causing the cap
to rise and seal the printheads. When the carrier moves
to the right, it uncaps the printheads. The wipers clean
the printhead nozzle plates as the carrier leaves the
maintenance station. The wipers clean the printheads
only when the carrier is moving to the right. After the
cleaning operation is complete, a tab on the
maintenance station engages a tab on the carrier,
causing the wipers to lower.
Worn wipers can cause poor print quality after printhead
cleaning. Check for loose or worn wipers.
Worn caps cause the printhead nozzles to dry and clog.
Check for loose or worn caps.
If any worn or broken parts are found, replace the
maintenance station. Go to
“Maintenance station
removal” on page 4-18
.