Toshiba Satellite U400 Maintenance Manual page 147

Subtest 06
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Focus Test ( "E" Pattern)
This subtest sets the 1024*768 Mode and displays "E" patterns (18*18 dot
fonts), at 56 letters *42 lines surrounded by a high resolution white frame.
To exit this subtest and return to the High Resolution Display Test menu:
Press Enter if NO was selected for Test Loop on the Test Parameter Menu.
Press Ctrl + break if YES was selected for Test Loop on the Test Parameter
Menu.
Satellite U400 and Satellite Pro U400 Tests and Diagnostics Manual
Test Program for Field.