This table specifies the resolution by model number or touch technology type.
Condition description Resolution
Touch display not responding to touch
Capacitive Models Only: Make sure that only a finger is used to
touch the screen.
Note: The sensor can only detect fingers. Do not use pens or pencils
on the touch display.
All Models:
1. Check whether touch screen or protective screen is dirty. If
necessary, clean the screen (see “Cleaning the touch screen” on
page 67).
2. Verify that the keypad/MSR/touch cable is correctly attached to
the 4820 display and to the system.
3. Run the service diagnostic diskette.
4. Model 48T, see “Using the Touch Screen Utility” on page 58
5. Check the cable connections and replace the cables, if necessary.
6. Replace the 4820 display.
Totally blank display All Models:
1. Verify that the power indicator for the display is ON. If not, go to
the first condition listed in this table.
2. Verify that the system unit is ON.
3. Check the brightness controls.
4. If LED is orange (amber), go to the second condition listed in this
table.
5. Check the cable connections, and replace the cables, if
necessary.
6. Replace the 4820 display, if necessary.
v For Models 46x, 42x, and 4Fx, run the service diskette.
Unsupported video mode message Use operating system tools to change to a supported mode (see
Table 11 on page 78).
No Video/low power mode message Communication is not yet established between the host unit and the
4820.
1. Verify that the system unit is powered on.
2. Check the video cabling between the 4820 display and the system
unit.
Update November 2005
Chapter 4. Troubleshooting common problems 75
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