Infrared Transceiver Checkout



Infrared Transceiver Checkout

The infrared transceiver is located on the inverter card in the ThinkPad 701C / 701CS. When you run diagnostics on the infrared transceiver, the test is actually checking the top system board, not the infrared transceiver itself. Therefore, complete the following steps before running diagnostics or replacing any FRUs.
If the customer cannot establish a connection between the ThinkPad 701C / 701CS and a remote system, perform the following steps:
  1.  Ensure that the device the customer attempted to connect  with is an Infrared Data Association (IRDA) compliant device.
  2.  Check to make sure that  both systems are using the same revision level  of the same software.
  3.  Check setup options on both systems to ensure that the baud rate  and other setup parameters are the same.
  4.  Check the Configuration Utility to ensure that the infrared transceiver  is assigned to the same serial  port that is designated in the application software  and that the IRQ assignment is not shared  with any other device such as the internal modem  or external serial port on the MultiPort II.
  5.  Verify that the two systems are in close proximity (less than 1  meter [3.2 feet]  apart for IRDA-compliant devices)  and that the infrared transceiver window on the ThinkPad 701C / 701CS  is aligned with (directly opposite)  the remote device's window.
  6.  Ensure that the windows  on both systems are clean and unobstructed.


If the two systems still will not connect after you have followed the preceding steps and the remote system is another computer with a terminal program (for example, Windows Terminal). or Procomm) installed, perform the following tests:
  1.  Set up the terminal application on each system to communicate with  the infrared transceiver serial port at a speed of 115KB per second.
  2.  Type characters on the ThinkPad 701C / 701CS keyboard and check to see  whether or not  these characters appear on the remote system.  (Note that the characters you  type will not appear on the ThinkPad 701C / 701CS system.)
  3.  Type characters on the remote keyboard and check to see  whether or not  these  characters appear on the ThinkPad 701C / 701CS system.
  4.  If characters do not appear in  either step 2 or 3 and you  are certain that infrared is working correctly on the remote system,  replace the inverter card.
  5.  If characters do appear, consult the software vendor to ensure  that the customer is using a compatible software package  and that the setup parameters  are correct.


If data transfers between the ThinkPad 701C / 701CS and the remote system are slow or unstable:
  1.  Verify that the two systems are in close proximity  (less than 1  meter [3.2 feet] apart  for IRDA-compliant devices)  and that the infrared window on the ThinkPad 701C / 701CS  is aligned with the remote device's window.
  2.  Ensure that the windows  on both systems are clean and unobstructed.
  3.  If you are using TranXit, check the IRDELAY parameter in the  TRANXIT.INI file in the TRANXIT directory.  The parameter should be set  to 10.


To run the diagnostics test on the infrared transceiver, perform the following steps:
  1.  Power-off the computer, and  then power it on again.
  2.  Press the F1 key any time  while the POST memory count is proceeding.  When the memory test is completed, the Easy-Setup screen screen appears.
  3.  Press the left or right arrow key to  select Test and press Enter  or position the pointer over the Test icon and  click the left click button once.
  4.  Press Ctrl+A to enter advanced diagnostics.
  5.  Select Infrared and press Enter to run the  test on the infrared transceiver.  Test results will be displayed under the Infrared icon.
  6.  If no errors are detected,  the OK message appears.
  7.  If an error is detected, the FRU code and error description message  appear.  Go to 'FRU Codes' and replace the FRU.
  8.  To exit from the test screen, press Esc.


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