Lexmark C760 - Operator Panel Lcd;Status Led;Buttons Service Check

Diagnostic information 2-125
5060-4xx
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 “Step B” on page 2-135.
• 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 B
Note: Make sure the operator panel cable is seated firmly in J1 on the system board before proceeding with this
step.
Step Action and questions Yes No
1 Buttons Test - Perform the “Button Test” on
page 3-20.
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.
Replace the
“Operator
panel” on
page 4-53
Test passes. No
problem found
Step Action and questions Yes No
1 LCD Test - Perform the “LCD Test” on page 3-20.
Can you run the test?
Go to step 2 Go to step 4
2
LCD Test - Does the test pass? Problem solved Go to step 3
3
Operator panel - Is the operator panel operating
correctly except for a few pels missing or broken?
Replace the
“Operator
panel” on
page 4-53
Go to step 4
4
Operator panel assembly -Is the operator panel
assembly completely blank and the power on status
LED off?
Go to step 6 Go to step 5
5
Operator panel assembly - Is the operator panel
assembly completely blank and the power on status
LED on?
Go to step 10 Go to step 12
6
Does the printer beep 5 times? Go to step 7 Replace the
“Operator
panel” on
page 4-53
7
System board - Measure the voltage at connector J6-2
on the “System board” on page 5-8. The voltage
measures approximately +5 V dc.
Is the voltage correct?
Replace the
“Operator
panel” on
page 4-53
Go to step 8