Table of Contents
Advertisement
o
C)
o
6.7 REMOVAL AND REPLACEMENT PROCEDURES
The following procedures give the proper sequence for removal and replacement of
major assemblies. To avoid damage to parts, the procedure must be performed in
sequence.
6.7.1 PRINTED C"IRCUIT BOARD (PWA)
a. Disconnect I/O Cable from J1 (refer to Figure 6-1).
b. Disconnect harnesses from connectors on printed circuit board.
c. Remove two screws from printed circuit board adjacent to COllllector J1
(Figure 6-12).
d. Remove PWA by detatching
it
from the four push-in clips shown in Figure 6-12.
e. To replace printed circuit board push clips through printed circuit board. '
f. Replace two screws adjacent to connector J1.
g. Reconnect harness and I/O cable.
h. Set dipswitch Sl/S2
if
applicable.
i.
Perform Burst to Index Check and adjust if necessary (paragraph 6.
6~
2).
6.7.2 ACTUATOR ASSEMBLY
a.
b.
c.
d.
e.
f.
g.
h.
Open front panel door.
Disconnect harness from J2 and J4 on printed circuit board (see Figure 6-1).
Remove four (4) socket head screws securing chassis support (Figure
G-S ).
Slide chassis support back far enough to clear push rod (Figure 6-16) of front
panel and lift support clear of chassis.
Remove two (2) screws securing bearing retainer (Figure 6-5 ).
Remove stepper motor clamp by removing two socket head screws (Figure 6-5 )
Remove Cable Clamp.
Carefully slide actuator assembly (stepper motor, actuator, and bearings at the
end of stepper shaft) straight out toward the rear of the FDD until unit is clear
of the casting.
To replace actuator assembly, slip bearings into support casting, Figure 6-5 •
(Assure carriage assembly is fitted on carriage guide. )
[
CA\n~~~J
The wavy spring washer between the two bearings
can prevent the bearings from being inserted into
the support casting
if
the washer has slipped off-
center and protrudes beyond the circumference of
the bearings.
If
this happens, loosen the retainer
s crew on the end of the shaft so the bearings can
separate and the washer can be repositioned. The
screw must be retightened after the bearings are
successfully inserted.
77834769-U
6-27
Advertisement
Table of Contents
