Toshiba Satellite Pro U400 Series, Maintenance Manual

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Test Program for Field.
18
Satellite U400 and Satellite Pro U400 Tests and Diagnostics Manual
3.5 Memory Test
To execute the Memory Test select 02 from the Diagnostic Test Menu, press Enter and
follow the directions on the screen. The Memory Test contains five subtests that test the
computer’s memory. Move the highlight bar to the subtest you want to execute and press
Enter .
NOTE: If NO is selected for Test Loop on the Test Parameter menu, the Test Status
screen displays while the test is executing. When the test is complete the Memory Test
menu displays.
If YES is selected for Test Loop on the Test Parameter menu, the Test Status screen
displays while the test is executing. Press Ctrl + break to return to the Memory Test menu.
Subtest 01
Conventional Memory
This subtest first writes test data patterns to conventional memory (0 to 640
KB), then reads the new data and compares the result with the original data
patterns.
If a compare error occurs, the write data, read data, and test address display on
the screen. Addresses are displayed in 4KB increments during the test.
Test Process:
1. Byte Enable Test
One bit write/ 8 bit read” is executed and the new data is compared
with the original data.
Test data = CCAA5533H, 80000000H
2. Byte Enable Test
“One bit write/16 bit read” is executed and the new data is compared
with the original data.
Test data = CCAA5533H, 80000000H
3. Data bus test
“One bit write/16 bit read” is executed and the new data is compared
with the original data.
Test data = 1H, 2H, 4H, 8H, 10H, through 80000000H.
4. Fixed data test
“16 bit write/ 16 bit read” is executed and the new data is compared
to the original data.
Test data = FFFFFFFFH, 00000000H, 80018001H