Sony Digital Betacam DVW-707 Maintenance Manual page 98

4-2. Parts Replacement
8. Upper Drum Eccentricity Adjustment
(1) Slowly turn the upper drum assembly counter-
clockwise and for one turn check that the indi-
cated deflection of a gauge meets the follow-
ing specification.
Specification : Within 3 um
If the specification did not meet, repeat the fol-
lowing three steps and adjust until the specifi-
cation meets.
(a) Slowly turn the upper drum assembly
counterclockwise and check the maxi-
mum and minimum value of the indicated
deflections.
(b) Turn the upper drum assembly until the
minimum deflection value indicates.
(c) From the end opposite of the prove press
the upper drum assembly in the direction
of the arrow so that the indicated deflec-
tion is half way between maximum and
minimum value.
n
If the indicated deflection did not move when
pressing the upper drum assembly by finger,
loosen the four screws that secure the upper
drum assembly.
If the indicated deflection easily moved when
pressing, tighten the screws a little.
(2) Set the torque screwdriver to 9.8 x 10
{1 kgf.cm}. Put the torque screwdriver in the
four holes on the board of the upper drum as-
sembly. Tighten the four screws in the se-
quence shown in the figure.
n
When tightening the screws just after the ec-
centricity adjustment, be sure to tighten them
_2
to 9.8 x 10
N.m {1 kgf.cm}.
(3) Set the torque screwdriver to 24.5 x 10
{2.5 kgf.cm}.
(4) Tighten the four screws in the same sequence
as in step 2.
(5) Re-check that the specification met.
9. Upper Drum Eccentricity Adjustment
Tool Removal
Remove the upper drum eccentricity adjustment
4-14
Upper drum eccentricity
adjustment tool
_2
N.m
_2
N.m
Press in this direction.
Upper drum
assembly
3
1
2
4
DVW-790WS/709WS/707
DVW-790WSP/709WSP/707P P2V1