Lexmark 7300 Series, Service Manual

Page: 30 / 88

4418-X6X
2-10
Service Manual
Control panel problems
Printer communication problems
Scanner problems
Symptom Action
• Buttons do not work.
• LCD does not display. If the LCD, buttons, or power light
fails, check the control panel 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 .
Symptom Action
The computer does not
communicate with the printer. Check the USB cable and system
board cable connections. If
connections are okay, replace the
system board. Go to the
“System
board removal” on page 4-14 .
Symptom Action
• CIS does not move.
• Lamp does not come on. Go to the “CIS module assembly
service check” on page 2-14 .
• Scanned images are faded, or
colors are dull, blurry, or fuzzy.
Images are slanted or crooked
and the straight lines in the
image appear to be jagged or
uneven.
• Blank copies
Go to the “Scan and copy quality
service check” on page 2-22 .