Sony DNW-A100 Maintenance Manual page 198

5-2. Upper Drum Assembly Replacement
8. Attach the Upper Drum Assembly
n
When replacing the upper drum of this model, it
is not necessary to do an eccentricity adjustment
of the upper drum.
(1) Adjust the position of the hole (A) on DR-
293 board with positioning pin on the upper
drum cover. (Fig. 1)
(2) Gently put the upper drum assembly on the
central shaft of the lower drum while keeping
the state of (1).
m
. Never hold the claws of the upper drum
cover when installing the upper drum
assembly.
. Be careful not to touch the AT head,
peripheral tape guides and drum support
when installing the upper drum assembly.
. Do not turn the upper drum with the upper
drum cover is installed.
(3) Press the claws of the upper drum cover in
the direction indicated by the arrows and
raise the upper drum cover up, then remove
it.
(4) Push the central portion of the upper drum
down by finger, and place the upper drum on
the flange of the lower drum surely.
(5) Set the torque screwdriver to 39.2
N . m{4.0 kgf . cm}. Put the torque screw-
driver in the four holes on the board cover of
the upper drum assembly while keeping the
state of (4). Tighten the four screws in the
sequence shown on the board cover gradually.
(6) Set the torque screwdriver to 58.8
N . m{6.0 kgf . cm}.
Tighten the four screws in the same sequence
as in step (5) using a torque screwdriver.
5-14
<Fig.1>
Upper drum assembly
Flange
. . . . . Remove the upper drum cover
Upper drum cover
_2
10
x
_2
10
x
Claw Claw
Attach the upper Drum Assembly
Positioning pin
Flange
Hole (A)
Lower drum
Board cover
DNW-A100/A50/A45
DNW-A100P/A50P/A45P