Texas Instruments Extensa 660 Series Maintenance Manual page 78

5-18 Troubleshooting Procedures
1
Vcc5=5V
Vcc3=3.3V
Yes
Check PWRGOOD
Yes
Check CPUCLK=66MHz
Yes
Check PCICLK=33MHz
Yes
END
Figure 5-2 System Fails to Boot, Initial Checks
System Fails to Boot:
Initial Tests
Check CON10 Pin13
No
PWRON=5V
Check DC-DC
Converter
Check U7 P1C16C62
No
Pin23 PWRGOOD
Check U39 74CT2524
No
Pin2
No
Check U40 74CT2524
Pin6