Operator Panel Lcd/Status Led/Buttons Service Check - Lexmark C750 Service Manual

5060-00x

Operator panel LCD/status LED/buttons service check

Use this service check to check both the operation of the panel buttons and to test the LCD display for correct
operation.
•
Replace the operator panel assembly if the LCD display functions normally, but the LED does not come on.
•
If one or more of the operator panel buttons do not operate correctly, go to "Step A."
If any of the following symptoms occur, go to
•
Operator panel LCD is blank/Power On/Status LED off
•
Operator panel LCD is blank/Power On/Status LED on
•
Operator panel LCD displays all diamonds/5 beeps/Power On/Status LED on
Step A
Step Action and questions
1 Buttons Test—perform the
page
Do any or all of the Buttons fail to operate correctly?
Note: If all the buttons fail to operate correctly, the LCD
display is blank, Power On Status LED is on, and the
printer beeps 5 times, go step B.
Step B
Note: Make sure the operator panel cable is seated firmly in J1 on the RIP board before proceeding with this
step.
Step Action and questions
1 LCD Test—perform the
Can you run the test?
2 LCD Test—does the test pass?
3 Operator panel—is the operator panel operating
correctly except for a few pels missing or broken?
4 Operator panel assembly—is the operator panel
assembly completely blank and the power on status
LED off?
5 Operator panel assembly—is the operator panel
assembly completely blank and the power on status
LED on?
6 Does the printer beep 5 times?
2-132
Service Manual
"Button Test" on
3-19.
"LCD Test" on page
"Step B" on page 2-132.
Yes
Replace the
operator panel.
See
panel removal"
on page 4-46
Yes
3-19. Go to step 2
Problem solved
Replace the
operator panel.
See
panel removal"
on page 4-46
Go to step 6
Go to step 10
Go to step 7
No
Test passes. No
problem found
"Operator
No
Go to step 4
Go to step 3
Go to step 4
"Operator
Go to step 5
Go to step 12
Replace the
operator panel.
See "Operator
panel removal"
on page 4-46