Texas Instruments 660 - Manual (Page 93)

Troubleshooting Procedures 5-33
Figure 5-19 Printer Port Interface Troubleshooting Diagram
1 8
Check BIOS Setup
Enter Correct Type of
Printer
Check the Data Bus Check RP5, RP7
Check Busy Signal
END
Yes
No
Yes
No
Check RP2 Pin6(BUSY)
Check U21(87338)
Entire Circuit
Yes
No
System Boots:
Printer Port Interface Checks