Sony SVT-N72P, Service Manual

Page: 31 / 90

2-15
SVT-N72P (E)
3-5. Cylinder (Drum)
3-5-1. Cylinder (Drum) Motor, Upper
Cylinder Assembly
1. Disconnect the flexible cable
2
connected to the
stator
1
.
2. Remove the two screws
3
, and remove the stator
1
,
and spring
4
.
In this state, the cylinder earth chip
5
will fall off if
the top and bottom of the mechanism unit are reversed.
n
Cylinder earth chip
5
can be removed by removing
the cylinder motor mounting
9
in step 4).
3. Remove the two screws
6
and remove the rotor
7
.
4. Loosen the screw
8
with the hexagonal wrench, and
remove the cylinder motor mounting
9
.
n
The hexagonal wrench (VHJ-0113) is 2mm diagonal-
ly. It is provided with the servicing tool upper drum
fitting tool kit (VHJ-0112).
5. Remove the upper cylinder assembly
0
and the
spacer
!-
.
The spacer
!-
may come off attached to the upper
cylinder assembly
0
.
Assembly Notes:
1. Adjustments are required when attaching the cylinder
motor mounting
9
. As shown in Fig. 3-5-2, face the
protruded side of the cylinder motor mounting
9
downwards, and with the hexagonal wrench pressed to
screw
8
, adjust the position of the cylinder motor
mounting
9
in the direction of the screw
!=
. In this
state, hold the cylinder motor mounting
9
with the
upper drum fitting tool (VHJ-0112) and tighten the
screw
8
with the hexagonal wrench.
2. When attaching the rotor
7
, the phase must be
adjusted to that of the upper cylinder assembly
0
. As
shown in Fig. 3-5-3, attach so that the hole
a
of the
upper cylinder assembly
0
and hole
b
of the rotor
7
are on the same side.
3. Tighten the two screws
6
for attaching the rotor
7
and the two screws
3
for attaching the stator
1
using a torque of 2.5 to 3.5 kg
.
cm.
4. Be careful that the tape path surface of the cylinder
(drum) does not scratch or become dirty.
If it becomes dirt, clean.
5. After attaching, refer to “4-3. Tape path adjustment”
and the section on electrical adjustments in the service
manuals for the respective models, and adjust the
switching position of the servo circuit.
Fig. 3-5-1
Fig. 3-5-2
Fig. 3-5-3
8
Screw
Hexagonal
wrench
!=
Screw
Upper drum
fitting tool
(VHJ-0112)
9
Mounting
motor
cylinder
7
Rotor
6
Screws
5
Cylinder earth chip
8
Screw
!-
Spacer
2
Flexible cable
4
Spring
3
Screws
1
Stator
9
Cylinder motor mounting
0
Upper cylinder
assembly
7
Rotor
a
Hole
b
Hole
0
Upper cylinder
assembly