Texas Instruments 660 System Boots: Cover Switch Function Checks

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