Operator Panel Service Check - Lexmark 4227 - Forms Printer B/W Dot-matrix Service Manual

4227-300

Operator panel service check

Note: Press any button except Start/Stop, Load/Unload, or
FormFeed. If Operator Panel Disabled is displayed, unlock the
operator panel by powering up with the Micro↑ and Micro↓ keys
pressed. Use the same procedure to re-lock the panel after service
is complete.
FRU
1 Operator Panel
2 Printer Cable
Operator Panel
3 Cover Switch
4 Main Logic Board
2-20
Service Manual
Action
If there is a 631 Display RAM Error, replace the
operator panel.
If there is a 63B Key Scan Error, one or more
buttons are being detected as pressed during
power-up.
Replace the operator panel.
During power-up, all LEDs and all LCD pels
should turn on briefly.
Enter the Service Menu and perform the
Button Test. If there are missing or extra pels
displayed, or if any of these tests fail, check the
condition and continuity of the operator panel
cable.
Replace the cable or the operator panel.
If Cover Open is displayed, check the cover
switch.
Jumper the cover switch connector on the
operator panel. If Cover Open is displayed,
check the condition and continuity of the
operator panel cable. Replace the cable or the
operator panel.
If the symptom has not changed, replace the
main logic board.