Door Lock Assembly Removal And Replacement; Power Panel Assembly Removal And Replacement; Blower Motor Starting Capacitor - HP 7925D Service Manual

7925 Removal and Replacement
k.
Disconnect the ground lead from the mainframe.
Green Wire (from blower motor)
Blue Wire (from power supply)
Red Wire (from blower motor)
Note: Negative symbol stamped on the capacitor, below the
terminals, should be on the down side (toward the
casting) of the capacitor.
REF 7311-58
Figure 5-7. Blower Motor Starting Capacitor
b. Disconnect the ac power cord from the ac mains
power.
c. Remove the shroud. (Refer to paragraph 5-3.)
d. Remove the side panels. (Refer to paragraph 5-4.).
e. Remove the actuator assembly. (Refer to paragraph
5-20.) Be extremely careful when handling the actua-
tor assembly and connecting cables.
f. On power and motor regulator PCA-A9, release the
three 1/4-turn fasteners and lower the PCA into its
service position.
g. Disconnect the power cable connectors from power
and motor regulator PCA-A9.
h. Remove the safety cover (19, figure 6-2) from the
power supply (22). On the input power terminal block
(30, figure 6-6), remove the leads from terminals 1
and 3.
1.
Remove harness cable retainer that is attached to the
bottom of the mainframe.
j. Remove the four bolts with washers (23 and 24, fig-
ure 6-2) that secure the power supply assembly to the
mainframe.
1.
Lift the power supply assembly off the mainframe.
To replace the power supply assembly, perform the above
steps in the reverse order.
Note: After the actuator assembly is installed,
the head and circumferential alignment
should be checked and adjusted, if neces-
sary, as outlined in paragraphs 3-12
through 3-19.
5-32. DOOR LOCK ASSEMBLY
REMOVAL AND REPLACEMENT
To remove the door lock assembly, proceed as follows:
a. Perform the preparation for service outlined in
paragraph 5-2.
b. Disconnect the ac power cord from the ac mains
power.
c. Remove the shroud. (Refer to paragraph 5-3.)
d. Remove the front frame assembly (refer to paragraph
5-7) and then remove the pack chamber assembly
(refer to paragraph 5-9.)
e. Remove the five screws (2, figure 6-4) that secure the
door lock assembly to the pack chamber assembly
and remove the assembly.
To replace the door lock assembly, perform the above steps
in the reverse order. When the pack chamber is replaced,
measure the absolute filter air pressure as outlined in
paragraph 2-13.
5-33. POWER PANEL ASSEMBLY
REMOVAL AND REPLACEMENT
To remove the power panel assembly (23, figure 6-1), pro-
ceed as follows:
a. Perform the preparation for service outlined
III
paragraph 5-2.
b. Disconnect the ac power cord from the ac mains
power.
c. Remove the rear shield (13, figure 6-1).
d. Disconnect all cables passing through the opening in
the power panel assembly to disc drive. Loosen the
cable strain relief clamps at the bottom of the enclo-
sure and withdraw the cables from the enclosure.
e. Disconnect any power cords attached to the outlets
on the power panel assembly.
5-17