Power-On Self Test (Post) Sequence; Symptom Tables; Multiple Function Printer (Mfp) Symptom Table - Lexmark X746de Service Manual

7526

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:
The operator panel turns on and displays the Lexmark logo.
1.
A progress bar displays.
2.
The LED turns on.
3.
4. The main fan turns on.
The machine performs the following tests:
5.
Sensor check
a.
Motor check—initializes the following motors:
b.
Cam motor
i.
ii. EP drive motor
Fuser motor
iii.
iv. Cartridge motor
Supplies check
c.
Note: The LED blinks red and an error message displays on the operator panel screen if the machine
detects errors during these test phases.
The LED light indicator blinks.
6.
The loading screen displays.
7.

Symptom tables

Multiple function printer (MFP) symptom table

Symptom
Close Front Door does not appear when
door is open
Dead printer
Front door locks and will not open.
Operator panel—one or more buttons do
not work.
Operator panel—does not respond to touch Check display connection. See the installation note on
Operator panel—display is blank. Printer
sounds five beeps.
Operator panel—display is blank.
Operator panel—black display, stripes
display, and distorted display
Tray 1 missing
Paper pick assembly—arm hangs down,
and tray cannot be opened
Scanner lid does not close completely, will
not stay open, or makes noise when
opening and closing.
Top access cover does not open.
Service Manual
2-8
Action
Go to
"920.26—POST service check" on page
Go to
"Dead printer service check" on page
Go to
"Front cover locked in place" on page
Go to
"One or more operator panel buttons fail" on
page 2-148.
page 4-189
Go to
"Operator panel display blank, five beeps, and LED is
off" on page 2-148.
Go to
"Operator panel display blank, five beeps, and LED is
off" on page 2-148.
Go to
"Black display, stripes display, and distorted display"
on page 2-149.
Go to
"Tray 1 missing service check" on page
Order PN 40X6319, and replace the broken plastic spring hook.
Go to
"ADF hinge (left and right) removal" on page
The top access cover spring or springs may be broken. Go to
the cover will not open" on page
access cover spring(s).
2-130.
2-146.
3-49.
2-157.
4-235.
"If
4-171. Replace the top
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