Texas Instruments Extensa 660 Series Maintenance Manual page 91

System Boots:
Cover Switch Function Checks
14
Check BIOS Setup
No
Yes
Check Switch
No
Yes
END
Figure 5-15 Cover Switch Function Troubleshooting Diagram
15
Cover Close Check
YES
Check COVSW#:
Low when cover closed
High when cover open
YES
Check COVSW#:
Normally High
Low pulse when Cover
Closes
YES
END
Figure 5-16 Cover Close Function Troubleshooting Diagram
Enter Correct Value
Press Cover Switch
Check COVSW#=0V
System Boots:
Cover Close Function Checks
Check D18, R112,
NO
C58
NO
Check D18, R112,
C58
Troubleshooting Procedures 5-31