Texas Instruments 660 - Manual (Page 80)

5-20 Troubleshooting Procedures
Figure 5-4 CRT Interface Troubleshooting Diagram
Check CN4 and CRT
Cable
Check L15, L21, L22,
L23, L24 (Red, Green,
Blue, Hsync, Vsync)
Check VGA Clock,
14,318MHz and
32,768KHz
Check U20 (2093)
Pin 71=33MHz,
Pin 93=14,318MHz,
Pin 82=32,768KHz
END
Yes
No
Yes
No
3
System Fails to Boot:
CRT Interface Checks