Cb Led Indicator Troubleshooting Flowchart; • Head Positioning System Functional Diagram - HP 7925D Service Manual

7925
NOTES:
1. Refer to the following diagrams for circuit details.
• Head Positioning System Functional Diagram.
fig. 4·26.
• Mainframe Assembly Wiring Diagram. fig. 4·23.
2. PCA's associated with CB malfunction include:
• Drive control PCA-A4.
Cause is probably CRB rather than DRDY.
Troubleshooting
7311-13
Move carriage forward so carriage back flag
clears carriage back detector slot. If this
cannot be done by setting RUN/STOP
switch to RUN from STOP position. discon-
nect connector A9P3 from PCA-A9 and care-
fully move carriage by hand. CAUTION: Do
not attempt to extend carriage to point where
heads are positioned over discs. To release
carriage from retracted position momentarily
connect ground to brown wired terminal of
carriage unlatched solenoid assy.
~----I"
Remove obstruclion.
Figure 4-11. CB LED Indicator Troubleshooting Flowchart
4-21