Epson 486SX - Manual (Page 169)

Keyboard Problems
If you are having trouble with the keyboard, check the
following:
1. If the screen displays a keyboard error message when you
turn on or reset the computer, make sure the keyboard is
securely connected to the computer. See “Connecting the
Keyboard” in Chapter 1 for instructions.
2. If the cursor keys do not work properly, the num lock
function may be on. When num lock is on, the keys on the
numeric keypad work only as numbers. If the
Num Lock
indicator in the upper right corner of the keyboard is lit,
press to turn off the function.
If you want to change the initial setting of the num lock
function, see “Using the Keyboard and Speaker Options” in
Chapter 2.
3. If nothing happens when you type on the keyboard, see
“The Computer Does Not Respond,” above.
4. If you still have trouble with your keyboard, run the
keyboard diagnostic tests described in Appendix C.
B-14 Troubleshooting