Cylinder (Drum); Cylinder (Drum) Motor, Upper Cylinder Assembly - Sony SVT-N72P Service Manual

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.
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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.
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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.
SVT-N72P (E)
3 Screws
6 Screws
4 Spring
5 Cylinder earth chip
Fig. 3-5-1
Upper drum
fitting tool
(VHJ-0112)
9 Mounting
motor
cylinder
!=
Screw
Fig. 3-5-2
0 Upper cylinder
assembly
7 Rotor
Fig. 3-5-3
2 Flexible cable
1 Stator
7 Rotor
9 Cylinder motor mounting
8 Screw
0 Upper cylinder
assembly
!- Spacer
8 Screw
Hexagonal
wrench
a Hole
b Hole
2-15