IBM 4820, System Reference Manual

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Chapter 4. System diagnostics and scan codes
This section describes the diagnostics.
Using the 4820 42T/4FD POS Terminal Service diskette
The service diskette is available from the support Web site. Before you begin
diagnostics, ensure your connections are as following:
v
RS-232 touch connects to COM 1
v
RS-232 MSR connects to COM 2
After you boot your system with the diskette, a menu appears that allows you to
calibrate the touch and test the MSR.
Using the OSD menu
The OSD menu allows you to adjust the display settings such as contrast, brightness,
clock phase, and image position.
To open the OSD menu, press and hold the minus (−) and plus (+) buttons at the same
time. The following menu appears:
Auto Adjust
Manual Adjust
Brightness
Contrast
Information
Reset
______________________________
(+) Select
(-) Scroll
(+&-) Exit
Auto Adjust
Automatically adjusts the settings. Use this option when you install the display
and at other times when image quality degrades.
Manual Adjust
Allows you to regulate the clock, phase, and image position. See “Using
Manual Adjust” on page 4-2.
Brightness
Allows you to regulate the display’s brightness setting.
Contrast
Allows you to regulate the display’s contrast settings.
Information
Provides the current screen resolution, the horizontal, and the vertical sync
signal frequencies.
© Copyright IBM Corp. 1999, 2003
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