Sony DVW-790WS/790WSP, DVW-709WS/709WSP manual Basic information, Preparations, Tools

4-2. Parts Replacement

Notes

If rotary heads are worn out or broken, replace the upper drum assembly.

The head chip can not be replaced.

Basic information

Apart from the periodic replacement time, the upper drum assembly needs to be replaced in the following case.

.If a correct RF waveform is not obtained after the tracking adjustment

Preparations

1.Check that the unit is in the unthreading end mode.

2.Turn the power off.

3.Remove the front lid and the outside panel. (Refer to section 1-6 of Maintenance Manual Part 1.)

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The upper drum assembly can replace when the cassette compartment attaches to the unit.

Tools
. Torque screwdriver bit (for M2)	: J-6325-380-A
. Hexagon bit (across 1.5 mm)	: J-6326-120-A
. Torque screwdriver (for 3 kg)	: J-6325-400-A
. Upper drum eccentricity adjustment tool (3)	: J-6001-820-A
. Upper drum eccentricity adjustment tool (2)	: J-6001-830-A
. Upper drum eccentricity adjustment tool (5)	: J-6087-000-A
. Upper drum eccentricity adjustment tool (6)	: J-6325-530-A
. L wrench (across 1.5 mm)	: 7-700-736-05
. Cleaning cloth	: 3-184-527-01
. Cleaning fluid	: 9-919-573-01

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(1)If the upper drum assembly is attached to the flange, tighten the screws to the following torque reading.

. First: 9.8 x10_2 N.m {1 kfg.cm}

. Second: 24.5 x10_2 N.m {2.5 kgf.cm}

To tighten the screws to the above torque reading, set the torque to 9.8 x 10_2N.m {1kgf.cm} after attaching the hexagon bit to the torque screwdriver.

(2)Assemble the upper drum eccentricity adjustment tool before it is used.

Upper drum eccentricity adjustment tool (3)

Upper drum eccentricity adjustment tool (2)

Upper drum eccentricity adjustment tool (6)

Upper drum eccentricty adjustment tool (5)

4-8 DVW-790WS/709WS/707

DVW-790WSP/709WSP/707P P2V1