Lexmark CS748de, Service Manual

Page: 47 / 504

Diagnostic information
2-9
5026
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Power-on self test (POST) sequence
When you turn the printer on, it performs a Power-On Self Test. Check for correct POST functioning of the base
printer by observing the following:
1.
The operator panel turns on and displays the Lexmark logo.
2.
A progress bar displays.
3.
The LED turns on.
4.
The main fan turns on.
5.
The machine performs the following tests:
a.
Sensor check
b.
Motor check—initializes the following motors:
i.
Cam motor
ii.
EP drive motor
iii.
Fuser motor
iv.
Cartridge motor
c.
Supplies check
Note:
The LED blinks red and an error message displays on the operator panel screen if the machine
detects errors during these test phases.
6. The LED light indicator blinks.
7. The loading screen displays.
Symptom tables
Printer symptom table
Symptom Action
Dead printer Go to
“Dead printer service check” on page 2-127
.
Operator panel—one or more buttons do
not work.
Go to
“One or more operator panel buttons fail” on
page 2-130
.
Operator panel—display is blank. Printer
sounds five beeps.
Go to
“Operator panel display blank, five beeps, and LED is
off” on page 2-130
.
Operator panel—display is blank. Go to
“Operator panel display blank, five beeps, LED on” on
page 2-130
.
Operator panel—stripes display, distorted
display, and other display issues
Go to
“Stripes display, distorted display, and other display
issues” on page 2-131
Tray 1 missing Go to
“Tray 1 missing service check” on page 2-139
.
Tray linking will not work. Go to
“Tray linking service check” on page 2-140
.
Front cover locks, and will not open Go to
“Front cover locked in place” on page 3-36
.