IBM THINKPAD 760C/CD (9546) - Manual (Page 608)

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Have the telephone line checked.
Printer Checkout
1. Make sure the printer is correctly connected and is
powered-on.
2. Run the printer self-test.
If the printer self-test does not run correctly, the problem is
in the printer. Refer to the printer service manual.
If the printer self-test runs correctly, do the following.
1. Verify the port settings in configuration.
2. Install a wrap plug on the port (indicated in
configuration) and run the advanced diagnostic tests.
3. If the advanced diagnostic tests (with the wrap plug
installed) do not detect a failure, replace the printer
cable.
If the problem is not corrected, replace the system
board.
596 IBM Mobile Systems - ThinkPad HMM Volume 3