Lexmark 7300 Series, Service Manual

Page: 38 / 88

4418-X6X
2-18
Service Manual
Power service check
Unit/Problem Action
External Power
Supply Plug the external power supply into an outlet, and
check for 30 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 with cables, belt,
and cable clip removal” on page 4-18 .
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 4-17 .
If the control panel LCD, buttons, or power light fails,
check cable connection J6 on the system board, and
then run the
“Power-On Self Test (POST) sequence”
on page 2-1 . If the problem remains, replace the
midframe cover with control panel and risers. Go to
“Midframe cover with control panel and risers
removal” on page 4-8
.
If the problem continues, replace the system board. Go
to
“System board removal” on page 4-14 .