Lenovo ThinkPad i Series 1157 ThinkPad 570 User's Reference - Page 197

Infrared communication problems, Problem, Cause and action, Infrared device

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Troubleshooting charts Infrared communication problems Problem Your computer cannot communicate with other devices using the infrared port. 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 communication speeds are the same. The infrared ports are clean. No objects are between the computer and the communicating device. The distance and angle between your computer and the device is within the specified range. You are not operating under direct sunlight. The infrared port is directly facing the other communication port. The communication application running on your computer is compatible with that running on the other computer. Refer to the application manuals for more information. 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 OK to disable DMA for the infrared port. 2. Close a parallel port panel. 3. Click the Infrared device button to open the infrared panel. 4. Choose DMA0 or DMA1 for the infrared port on the panel. 5. If you see the panel prompting if you want to disable DMA for an audio device, click OK. Chapter 4. Solving computer problems 181

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Troubleshooting charts
Infrared communication problems
Problem
Cause and action
Your computer cannot
communicate with other
devices using the infrared
port.
Make sure that:
The communication speeds are the same.
The infrared ports are clean.
No objects are between the computer and the communicating device.
The distance and angle between your computer and the device is within the
specified range.
You are not operating under direct sunlight.
The infrared port is directly facing the other communication port.
The communication application running on your computer is compatible with
that running on the other computer.
Refer to the application manuals for
more information.
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
OK
to disable DMA for the infrared port.
2. Close a parallel port panel.
3. Click the
Infrared device
button to open the infrared panel.
4. Choose DMA0 or DMA1 for the infrared port on the panel.
5. If you see the panel prompting if you want to disable DMA for an audio
device, click
OK
.
Chapter 4.
Solving computer problems
181