Toshiba Satellite Pro U300 Maintenance Manual - Page 122

Test Program for Field. 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 18 Satellite U300 and Satellite Pro U300 Tests and Diagnostics Manual