Unit Select Indicator Troubleshooting Flowchart - HP 7925D Service Manual

7925
Troubleshoot + 5 Vdc supply. (See fig. 4·23.1
Replace PCA-A11.
Troubleshooting
NOTES:
1. Refer to the following diagrams for circurt details.
• 1/0 Control System Functional Diagram, fig. 4-24
• Mainframe Assembly, fig. 4-23.
2. PCA's associated with unit select indicator malfunction include:
• Indicator PCA-A11.
Remove operator panel and check UNIT
SELECT switch for broken wires
Repair wiring to switch 53.
Figure 4-15. Unit Select Indicator Troubleshooting Flowchart
4-27