Tektronix Phaser 740, Service Manual

Page: 27 / 148

Service Guide
15
Front panel
These front panel features are found on the printer:
■
A two-line, 24-character LCD and two LEDs
■
Four push buttons
LCD
The LCD serves two purposes: displaying current image processor and print
engine status information and displaying an interactive menu. Status information
includes image processor status such as
Ready
,
Receiving data
and
Printing
.
Print engine status includes messages such as
Out of paper
,
Paper Jam
, and
Out of
Toner
. The interactive menu can only be entered while the print engine and image
processor are idle. The interactive menu allows the user to review and change certain
NVRAM, I/O ports and peripheral parameters.
Buttons
Button 1, the left-most button labeled the Exit key, cancels an operation while
in the interactive menu. The functions of Buttons 2, 3 and 4 are defined by the
particular menu or function being displayed on the LCD display. The bottom row of
the LCD labels the current function of each button.
In addition, pressing the buttons as you turn on the printer enables certain diagnostic
modes:
■
Pressing and holding Button 1, as you turn on the printer, skips power-up
diagnostics (except for a brief kernel test) and proceeds to PostScript
startup.
■
Pressing and holding Button 3, as you turn on the printer, executes
interactive service tests. Refer to “Phaser 740 service tests” on page 77.
The topic, “Resetting NVRAM” on page 91 explains how to use the front panel
buttons to reset the printer’s NVRAM to its factory default values.