Toshiba PORTEGE Z830 Satellite Z830 Maintenance Manual page 153

Subtest 01 Pressed Key Display (Main key)
When you execute this subtest, the keyboard layout is drawn on the display as
shown below. When any key is pressed, the corresponding key on the screen
changes to the key character that was pressed. Holding a key down enables
the auto-repeat function that causes the key's display character to blink.
Press Del + Enter to end the test.
PORTEGE Z830 Satellite Z830 Series Maintenance Manual (960-883)
IF TEST OK, Press [Dell][Enter]key
Tests and Diagnostics
[CONFIDENTIAL] 3-49