Removal And Replacement; Introduction; Preparation For Service; Shroud Removal And Replacement - HP 7925D Service Manual

REMOVAL AND REPLACEMENT
I~
This section provides removal and replacement procedures
for the field-replaceable disc drive assemblies. The proce-
dures are given in the order in which disassembly nor-
mally occurs. Each assembly or component that must be
removed before access can be gained to another assembly
is presented first, followed by the next assembly that can
be removed. References are made to illustrations and list-
ings contained in Section VI, Replaceable Parts, to aid in
identifying and locating parts.
5-1.
5-2.
INTRODUCTION
PREPARATION FOR SERVICE
b. Disconnect the ac power cord from the ac mains
power.
c. Open the rear door.
d. Remove the two screws (2, figure 6-1) that secure the
shroud.
e. Lift the rear of the shroud up to gain approximately 3
em
(l
in.) clearance and pull the shroud straight back.
To replace the shroud, place it on the side rails of the
enclosure and push straight in. When fully seated, the
fixed runners on the shroud will drop into mating holes.
Secure the shroud with thetwo mounting screws.
WARNING
This disc drive does not contain
operator-serviceable parts. To pre-
vent electrical shock, refer all instal-
lation and maintenance activities to
service-trained personnel.
Before starting any removal and replacement procedure,
perform the following steps:
a. If the disc drive is in an operating mode, set the
RUN/STOP switch to STOP. The DRIVE READY in-
dicator will extinguish immediately.
b. Allow the spindle to halt (approximately 30 seconds).
The DOOR UNLOCKED indicator will light, at which
time the spindle has stopped rotating, the door unlock
solenoid is energized, and it is safe to open the pack
chamber door.
c. Remove and store the disc pack.
d. Open the front and rear doors.
e. Set the power switch on the power panel assembly to
the off position. Disconnect the ac power cord from
the ac mains power.
5-4. DOOR AND SIDE COVER
REMOVAL AND REPLACEMENT
To remove either door, proceed to step a. The side covers
are secured to the frame with four screws, two screws on
each end. The cover is also secured by a flange and bracket
arrangement located at the bottom center of the cover, and
with latching brackets at the top. To remove either side
cover, proceed to step b.
a. To remove the front or rear door, proceed as follows:
(1) Perform the preparation for service outlined in
paragraph 5-2.
(2) Disconnect the ac power cord from the ac mains
power.
(3) Open the door that is to be removed.
(4) Support weight of door with one hand and grasp
upper hinge pin with other hand.
(5) Pull upper hinge pin up until it is free of hinge
bracket and then move door away from hinge
bracket. Now move door upward until lower
hinge pin is free of lower hinge bracket.
(6) Close door until it is free of side panel and then
lift door away from cabinet.
5-3.
SHROUD REMOVAL AND
REPLACEMENT
(7) To replace the door, perform the above steps in
reverse order.
To remove the shroud, proceed as follows:
a. Perform the preparation for service outlined in
paragraph 5-2.
b. To remove a side cover, proceed as follows:
(1) Remove the four screws (10, figure 6-1) securing
the cover to the frame.
5-1