Texas Instruments 660 - Manual (Page 78)

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