Table 2-8 Control-panel diagnostic functions (continued)
Item Description Remarks
Ambient-light sensor
test
Checks the ambient light sensor Use this item to test the ambient-light sensor
functionality.
1. Touch the icon.
2. Shine a flashlight at the control panel to the
left of, and down about 25.4 mm (1 in,)
from the Home
button.
3. The numbers displayed below the icon
should be any value other than zero.
Home button test
Tests the Home
button Use this item to test the Home button LED and
switch functionality.
1. Touch the icon.
2.
Press the Home
button on the right side
of the control panel. The LED icon on the
control-panel display illuminates if the button
LED and switch are correctly functioning.
Control-panel diagnostic flowcharts
TIP: To open the diagnostic mode: Tilt the control panel forward. On the back side of the control
panel, use a paperclip to press the button inside the small hole near the center of the control panel.
Use the flowcharts in this section to troubleshoot the following control panel problems.
●
Touchscreen blank, white, or dim (no image)
●
Touchscreen is slow to respond or requires multiple presses to respond
●
Touchscreen has an unresponsive zone
●
No control-panel sound
●
Home button is unresponsive
●
Hardware integration pocket (HIP) is not functioning (control panel functional)
130 Chapter 2 Solve problems ENWW
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