Lenovo ThinkPad 600X TP 600E User's Reference - Page 155

Problem, Cause and Action, Infrared device, connector

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Troubleshooting Guide Problem Incorrect data is sent between your computer and a communicating device. You cannot use DMA channels for both the parallel connector and the infrared port. Cause and Action Make sure that: The distance and angle between your computer and the device is within the set range. The communication speeds are the same. There are no other devices that radiate infrared rays, such as remote-controlled devices or wireless headphones, near your computer or the communicating device. You are not operating under direct sunlight. No fluorescent lamps are near your computer or the communicating device. If you enable ECP and choose DMA3 (the default value) for the parallel connector, you might be prompted if you want to disable DMA for the infrared port. To use DMA channels for both the parallel and infrared ports, do the following: 1. Click on OK to disable DMA for the infrared port. 2. Close a parallel port panel. 3. Click on the Infrared device button to open the infrared panel. 4. Choose DMA0 or DMA1 for infrared port on the panel. 5. If you see the panel prompting if you want to disable DMA for an audio device, click on OK. Chapter 4. Solving Computer Problems 141

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Troubleshooting Guide
Problem
Cause and Action
Incorrect data is sent
between your computer
and a communicating
device.
Make sure that:
The distance and angle between your computer and the device is within the
set range.
The communication speeds are the same.
There are no other devices that radiate infrared rays, such as
remote-controlled devices or wireless headphones, near your computer or
the communicating device.
You are not operating under direct sunlight.
No fluorescent lamps are near your computer or the communicating device.
You cannot use DMA
channels for both the
parallel connector and the
infrared port.
If you enable ECP and choose DMA3 (the default value) for the parallel
connector, you might be prompted if you want to disable DMA for the infrared
port.
To use DMA channels for both the parallel and infrared ports, do the
following:
1. Click on
OK
to disable DMA for the infrared port.
2. Close a parallel port panel.
3. Click on the
Infrared device
button to open the infrared panel.
4. Choose DMA0 or DMA1 for infrared port on the panel.
5. If you see the panel prompting if you want to disable DMA for an audio
device, click on
OK
.
Chapter 4.
Solving Computer Problems
141