Service manual

Maintenance
4-11
3. Recalibration using the Diagnostic Boot menu — A PS2 mouse or keyboard with RJ9
connector is required to perform a touchscreen calibration. Perform the following steps to
calibrate the touchscreen.
a. Power OFF the 90387 and connect either a PS2 mouse or keyboard.
b. Power ON the 90387 and enter the Diagnostic Boot menu. This menu may be
accessed using the mouse or keyboard.
• To access the Diagnostic Boot menu using a PS2 mouse, simultaneously click the
left and right mouse buttons during the “3-2-1” boot-up countdown. (The left and right
mouse click must be simultaneous with the “3” of the “3-2-1” countdown.)
• To access the Diagnostic Boot menu using a keyboard, press CTRL+D during the
“3-2-1” boot-up countdown. (The CTRL+D sequence must be simultaneous with the
“3” of the”3-2-1” countdown.)
c. Select v (set video characteristics) on the Diagnostic Boot menu.
d. Select a (1024 x 768, 60 Hz) on the Video menu.
e. Power OFF the 90387, then power ON again.
f. As part of the initialization routine, the unit will automatically display a calibration
screen. The calibration screen will prompt the user to touch the upper-left, upper-right,
and lower-right corners of the display for calibration.
4. Calibration is now complete.
Disassembly Procedures (90385)
Tools Required
• Static mat
• Static wrist strap
• #1 and #2 Phillips screwdrivers (#2 driver > 7.5 inches [19 cm] shaft)
• 13/16 inches (4.75 mm) nut driver
• Standard flat screwdriver
• Top cover removal tool (P/N 003-0085-00)
Top Cover Removal
1. Remove the AC cord and retainer from the display assembly.
2. Refer to Figure 4-2 for the location of two screws on the bottom of the display.
3. Remove these two screws.
4. Using a soft cloth to protect the CRT face from scratching, lay the monitor on its face to
enable you to remove the two cover screws.
CAUTION:
• Before disassembly, switch the main power OFF and disconnect the AC
cord from the wall outlet.