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