Sony HDW-750 Maintenance Manual page 285

11. Installing the upper drum assembly
(1) Hold the top of the new upper drum assembly
with hand. Align the phasing hole of the
upper drum assembly with the phasing pin of
the lower drum.
(2) Insert the phasing hole and the drum shaft
hole of the upper drum assembly into the
phasing pin of the drum shaft of the lower
drum very gently and carefully. Place the
upper drum assembly on the flange surface
the lower drum without any slant angle.
n
When installing the upper drum assembly, be
careful not to touch the video head against
brush support and other mechanism.
(3) Insert the four hexagon cap screws into the
mount holes that are removed when removing
the upper drum assembly with a pair of
tweezers.
(4) Tighten the hexagon cap screws tentatively
with hexagon bit, one bolt after another in the
order as shown in the illustration so that they
are tightened with equal strength.
HDW-750/750CE V1
Drum shaft hole
Drum shaft
Lower drum
assembly
Hexagon cap screws 1
4
2
7-2. Upper Drum Assembly Replacement
Upper drum assembly
Phasing hole
Phasing pin
Flange
surface
3
Hexagon cap screws
7-15