5-26
Troubleshooting Procedures
Figure 5-10 DC/DC Converter Interface Troubleshooting Diagram
PRESS POWER
SWITCH
9
DC-IN = 20V
BAT = 12V
Check T3, F1, D12,
D11, F2, Q5, D14
SW2 = 5V
Check M/B
Check SW1
Check CN33 PIN4
for low pulse
Check SW2
U1, PIN 7
Check D29, D2, D3, U2,
Q1, Q2, Q3, Q4, C14, R13,
R14, D4, D5, R8, R9, R10,
R11, R1
0V
5V
END
NO
YES
NO
NO
NO
YES
YES
YES
5V
0V
System Fails to Boot:
DC/DC Converter Interface Checks
Summary of Contents for Extensa 660 Series
Page 1: ...Maintenance Manual ExtensaTM 660 Series Notebook Computers 9813214 0001 Rev A February 1997 ...
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Page 124: ...A 2 Schematic Diagrams Figure A 1 Motherboard PWB Logic Diagrams Sheet 1 of 23 ...
Page 125: ...Schematic Diagrams A 3 Figure A 2 Motherboard PWB Logic Diagrams Sheet 2 of 23 ...
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Page 127: ...Schematic Diagrams A 5 Figure A 1 Motherboard PWB Logic Diagrams Sheet 4 of 23 ...
Page 128: ...A 6 Schematic Diagrams Figure A 1 Motherboard PWB Logic Diagrams Sheet 5 of 23 ...
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Page 134: ...A 12 Schematic Diagrams Figure A 1 Motherboard PWB Logic Diagrams Sheet 11 of 23 ...
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