Sony HDCAM HDW-F900R Maintenance Manual page 288

12. Installing the upper drum eccentricity
adjustment tool
(1) Attach the upper drum eccentricity adjust-
ment tool that is assembled at the beginning
of this Section (see n of Tools), to the
flatness check tool.
(2) Adjust the upper drum eccentricity adjust-
ment tool so that the probe at the top of the
upper drum eccentricity adjustment tool (6) is
positioned between the 2nd and the 3rd
grooves from the bottom of the outside
surface on the upper drum assembly.
n
Be careful not to touch the measurement
probe against the video head.
13. Adjusting upper drum eccentricity
(1) Slowly rotate the upper drum assembly
counter-clockwise. Check that the eccentrici-
ty gauge reading meets the following specifi-
cation of the gauge pointer deflection
throughout the one full rotation of the upper
drum assembly.
Specification : Within 3 um
If the specification does not meet, repeat the
following three steps of (a) to (c) and adjust
until the specification meets.
(a) Slowly rotate the upper drum assembly
counter-clockwise and check the maxi-
mum and minimum values of the gauge
pointer deflection.
(b) Then rotate the upper drum to the
position that gives the minimum deflec-
tion of the gauge pointer reading.
(c) Press the point that is 180 degree oppo-
site of the measurement probe, of the
upper drum in the direction of the arrow
so that the gauge pointer reading is half
way (1/2) between the maximum and
minimum values of deflection.
n
If the gauge pointer reading does not move
even when the upper drum is pressed by
finger, loosen the four hexagon cap screws
slightly that secure the upper drum.
If the gauge pointer reading moves too easily when
pressed, tighten the hexagon cap screws a little.
7-16
Measurement
probe
Upper drum
eccentricity
adjustment tool
Flatness check tool
3rd groove
2nd groove
Upper drum assembly
Measurement
probe
HDW-F900R/V1 (E)