Texas Instruments Extensa 660 Series Maintenance Manual page 89

12
Check BIOS Setup
Yes
Check Transmitting
Signal
Yes
Check Receiving Signal
Yes
Check MD(0~63)
Yes
END
Figure 5-13 Serial Port Function Troubleshooting Diagram
System Boots:
Serial Port Checks
Enter Correct type for
COM1
No
Check U1(MAX213)
No
SOUT1
Check U1(MAX213)
No
SIN1
Check U21(87338) Pin1,
No
Pin100, IRQ3,IRQ4
Troubleshooting Procedures 5-29