Lexmark 4059-XXX - Manual (Page 102)

2-75 4059 Service Manual
4059-XXX
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 a 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
“LCD Test” on page 3-9 from
the hardware tests before continuing with this diagnostic service
check.
2 Engine Board
(No buttons work) 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.
FRU Action
1 Operator Panel Cable Check for proper installation of the
cable at the engine board (J11) and
at the operator panel. Check the
continuity of the operator panel
cable. If incorrect, replace the cable.
2 Operator Panel Display
blank, 5 beeps, LED Off Check the voltage at J11-2 on the
engine board. It measures
approximately +5 V dc. If incorrect,
replace the engine board. If correct,
replace the operator panel assembly.
3 Operator Panel Display
blank, 5 beeps, LED On Check for ground between J13-4 and
ground. If correct, replace the
operator panel assembly. If incorrect,
replace the engine board.
FRU Action