Lenovo ThinkPad 390X Hardware Maintenance Manual (November 1999): ThinkPad 390 - Page 35
Keyboard and Auxiliary Input Device Checkout
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Keyboard and Auxiliary Input Device Checkout Note: Remove the external keyboard if the internal keyboard is to be tested. If the internal keyboard does not work or an unexpected character appears, make sure that the flexible cable extending from the keyboard is correctly seated in the connector. If the keyboard cable connection is correct, run the Keyboard Test. 1. Boot from and start PC-Doctor DOS. (See "PC-Doctor DOS System Diagnostics" on page 48 for details.) 2. Select Interactive Tests. 3. Select Keyboard. 4. Follow the instructions in the message window. If the test detects a keyboard problem, do the following one at a time to correct the problem. Do not replace a nondefective FRU. 1. Replace the keyboard. 2. Replace the system board. The following auxiliary input devices are supported for this computer: Numeric keypad Mouse (PS/2 compatible) External keyboard (with keyboard/mouse cable) If any of these devices do not work, reseat the cable connector and repeat the failing operation. If the problem does not reoccur, replace the device and then the system board. ThinkPad 390X / i 1700 HMM 29
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