Operator Panel Service Check - Lexmark T520 Service Manual

Infoprint 1120 and 1125

Operator Panel Service Check

Operator Panel Buttons Service Check
Note: Before continuing with this service check do the
on page 3-11
FRU
1 Operator Panel Assembly
2 Engine Board
(No buttons work)
Operator Panel Display Service Check
Service Tip: The printer has detected a problem with the engine
board, operator panel cable or operator panel assembly if POST
does not complete and the printer emits 5 beeps and stops in a
continuous pattern until the printer is turned off. The operator panel
cable is an individual cable on some printers and a combination
cable assembly with the cover switch cable on later models.
Note: If the operator panel is operating properly except for a Pel or
a few Pels missing or broken, run the
the hardware tests before continuing with this diagnostic service
check.
in the diagnostic aids chapter.
Action
If any button fails the Button Test,
replace the operator panel
assembly.
Check the voltage at J11-5. The
voltage measures approximately
+5 V dc with the controller board
removed. If incorrect, replace the
engine board. If correct, check the
continuity of the operator panel
cable. If incorrect, replace the cable.
If correct, replace the operator panel
assembly.
"LCD Test" on page 3-11
Diagnostic Information
"Button Test"
from
2-79