Toshiba TECRA S1 Maintenance Manual page 61

2 Troubleshooting
Check 3
Check 4
Check 5
2-24
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The System board may be faulty. Replace it with a new one following the
instructions in Chapter 4. If the keyboard is still not functioning properly,
perform Check 4.
The memory may be defective. Replace the memory module with a new one
following the steps described in Chapter 4. If the problem persist, perform
Check 5.
The CPU may be faulty. Disassemble the computer following the steps
described in Chapter 4 and replace the CPU with a new one.
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2.7 Keyboard
TECRA S1 Maintenance Manual