Door Unlock Solenoid Troubleshooting; • Spindle Rotation System Functional Diagram - HP 7925D Service Manual

7925
Turn disc drive power·on and set
RUN/STOP switch S2 to STOP.
Replace PCA-A9.
NOTES:
1. Refer to the following diagrams for circuit details.
• Spindle Rotation System Functional Diagram,
fig. 4-25.
• Fault Detection System Functional Diagram, fig. 4-29.
• Mainframe Assembly Wiring Diagram, fig. 4-23.
2. PCA's associated with door unlocked solenoid malfunction in-
clude:
• Drive control PCA-A4.
• Power and motor regulator PCA-A9.
Refer to DRIVE FAULT indicator trouble-
shooting flowchart, fig. 4-3.
Refer to emergency return (CRB) trouble-
shooting flowchart, fig. 4-21.
Replace PCA-A4. Check connector on
PCA-A11. Verify operation of RUN/STOP
switch.
Replace solenoid assembly.
Troubleshooting
7311-15(1)
Figure 4-13. Door Unlock Solenoid Troubleshooting Flowchart (Sheet 1 of 2)
4-23