Sony DNW-A100 Maintenance Manual page 194

5-2. Upper Drum Assembly Replacement
Basic Knowledge
Replace the upper drum assembly in the following case.
. A correct RF signal waveform cannot be obtained even if the tracking adjustment
is performed.
Preparation
1. Turn the power off.
2. Remove the upper lid. (Refer to Section 2-3-1 in Maintenance Manual Part 1.)
3. Remove the plate MD assembly.
(Refer to Section 2-4 in Maintenance Manual Part 1.)
4. Remove the cassette compartment.
(Refer to Section 2-5 in Maintenance Manual Part 1.)
Tools
. Hexagonal wrench driver (2.5 mm):
. Torque screwdriver (6 kg.cm)(JB-5251):
. Torque screwdriver (12 kg.cm)(JB-5252):
. Torque screwdriver's bit (+2 mm, l=75 mm):
. Torque screwdriver's hexagonal bit (d=2.5 mm, l=120 mm): J-6251-090-A
. Cleaning cloth:
. Cleaning fluid:
. Upper drum remover:
Removal
1. Remove the Video Head Cleaner
Assembly
(1) Disconnect the harness from connector
CN851 on the PD-35 board.
(2) Cut the harness clamper.
(3) Remove the harness from the sensor holder.
(4) Remove the screw, shift the video head
cleaner assembly in the direction indicated by
the arrow A, and remove it from the height
determing plate.
5-10
7-700-766-04
J-6252-510-A
J-6252-520-A
J-6323-420-A
3-184-527-01
9-919-573-01
Supplied with new repair upper drum
Video head
cleaner assembly
Harness clamper
CN851
PD-35
board
Height
Harness
determing
plate
Sensor holder
Remove the Rotary Head Cleaner Assembly
Screw (PSW3 x 8)
A
DNW-A100/A50/A45
DNW-A100P/A50P/A45P