Lexmark 3350 Service Manual - Page 35

Power service check, Power-On Self Test POST sequence

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4479-XXX FRU Midframe Assembly End-of-Forms Flag and Spring Action Check the following for wear: • Small feed rollers • Large feed roller • Exit roller • Star rollers If any of the rollers are worn and causing a paper feed problem, replace the print engine. Go to "Print engine removal" on page 4-13. Check for binds or damage. If the flag or spring are defective, replace the print engine. Go to "Print engine removal" on page 4-13. Power service check FRU External Power Supply • Printhead Cables • Paper Feed Motor • Carrier Transport Motor • Control Panel Action Plug the external power supply into an outlet. Check for 29 V dc. If the voltage is incorrect, replace the power supply. Unplug the All-In-One. Check all connections on the system board and plug the All-In-One back in. Look for a symptom change. If the printhead cables are defective, replace the carrier assembly. Go to "Carrier assembly and encoder strip removal" on page 4-15. Check for broken circuits or short-circuits in the paper feed and carrier transport motors. If either motor is defective, replace the print engine. Go to "Print engine removal" on page 4-13. If the control panel LCD, buttons, or power light fails, check cable connection J8 on the system board, and then run the "Power-On Self Test (POST) sequence" on page 2-1. If the problem remains, replace the scanner module assembly. Go to "Scanner module assembly removal" on page 4-10. If the problem continues, replace the system board. Go to "System board removal" on page 4-17. Diagnostic information 2-17

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4479-XXX
Diagnostic information
2-17
Power service check
Midframe
Assembly
Check the following for wear:
•
Small feed rollers
•
Large feed roller
•
Exit roller
•
Star rollers
If any of the rollers are worn and causing a paper feed
problem, replace the print engine. Go to
“Print engine
removal” on page 4-13
.
End-of-Forms
Flag and Spring
Check for binds or damage. If the flag or spring are
defective, replace the print engine. Go to
“Print
engine removal” on page 4-13
.
FRU
Action
External Power
Supply
Plug the external power supply into an outlet. Check for
29 V dc. If the voltage is incorrect, replace the power
supply.
• Printhead
Cables
•
Paper Feed
Motor
• Carrier
Transport
Motor
•
Control Panel
Unplug the All-In-One. Check all connections on the
system board and plug the All-In-One back in. Look for
a symptom change.
If the printhead cables are defective, replace the carrier
assembly. Go to
“Carrier assembly and encoder
strip removal” on page 4-15
.
Check for broken circuits or short-circuits in the paper
feed and carrier transport motors. If either motor is
defective, replace the print engine. Go to
“Print engine
removal” on page 4-13
.
If the control panel LCD, buttons, or power light fails,
check cable connection J8 on the system board, and
then run the
“Power-On Self Test (POST) sequence”
on page 2-1
. If the problem remains, replace the
scanner module assembly. Go to
“Scanner module
assembly removal” on page 4-10
.
If the problem continues, replace the system board. Go
to
“System board removal” on page 4-17
.
FRU
Action