All Models - IBM 4820 Planning, Installation And Service Manual

January 14, 2005

All models

This section provides information pertinent to all 4820 models.
This table specifies the resolution by model number or touch technology type.
Condition description
The power indicator on the display is off
Power LED amber
Touch display not responding to touch
Resolution
Models 42x, 4Fx, 46x, 10D, 1FR
v Ensure that the 4820 is powered on by pressing the power button
on the display (models 42x and 4Fx only).
v Check the voltage of the power supply output (see "Testing the
power supply" on page 4-6.)
– If the voltage is correct, go to the next item.
– If the dc voltage is not correct, verify that the power cord is
plugged into a working ac outlet.
– Then, verify that the power cord is properly plugged into the
power brick.
– If the voltage remains incorrect, replace the power supply.
v Check that the power brick is properly plugged into the power port
of the display.
v Replace unit.
Models 48D, 48T
v Check the voltage output of the powered USB cable (see "Voltage
for USB power" on page 4-6).
– If the voltages are correct, replace the unit.
– If the voltages are incorrect, remove the cable from the system
unit, and verify that the voltage are correct at the system port.
– The system unit requires servicing if the voltage at the port is
not correct.
v If the voltages are correct at the system unit port and wrong at the
cable, replace the cable.
v Check that the powered USB cable is properly connected to the
4820 SurePoint Solution.
v Replace unit.
All Models:
v Low power mode. Communication is not yet established between
host and 4820
v Check the video cable connections and replace the cables, if
necessary.
v Verify that the unit is powered on.
v Check the standby or suspend mode of power management.
v Replace the unit, if necessary.
All Models:
v 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.
v Check to ensure that the keypad/MSR/touch cable is correctly
attached to the 4820 display and to the system.
v Run the service diagnostic diskette.
v Model 48T, see "Using the Touch Screen Utility" on page 2-39
v Check the cable connections and replace the cables, if necessary.
v Replace the 4820 display.
Chapter 4. Troubleshooting common problems
4-3