Troubleshooting other hardware conditions
Condition description Resolution
The power indicator on the front of the unit
is off.
1. Ensure that the 4838 is powered on by
depressing the power button on the
terminal.
Note: When the system is off but is
connected to a receptacle, the power LED
will blink very slowly. This slow blinking
indicates that the system is receiving
power.
2. Check that you have power at the outlet.
3. Check that the AC cord is connected to
the power supply and the outlet.
4. Check that the power input connector is
firmly connected.
If the condition persists, follow these steps:
1. If the unit is receiving power, remove the
rear cover and ensure that all cables and
circuit boards are fully seated in the
connectors.
2. Replace the control panel card.
3. Replace the system board.
The display is blank and the system is
beeping.
1. Check the system memory to ensure that
the memory control card is seated
properly.
2. Replace the memory SO-DIMM.
Touch display not responding to touch
1. Make sure that you use an object
approximately the width of your finger to
touch the screen.
2. Run the diagnostics.
3. Check to ensure that the cables internal
to the unit are correctly attached to the
4838 and to the system.
4. If condition, persists, replace the front
bezel and touch assembly.
5. If condition continues, replace the system
board¹.
Totally blank display
1. Check that the power indicator for the
display is ON. If not, go to the first
condition listed in this table.
2. Check the brightness controls.
3. Check the cable connections, and replace
the cables, if necessary.
4. Replace the inverter card.
5. If condition persists, replace the system
board¹.
Diagnosing problems and troubleshooting
Chapter 5. Diagnosing problems and troubleshooting 67
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