Sony Betacam SX DNW-A100 Maintenance Manual page 237

Digital video hybrid recorder
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Measurement of Head Tip Protrusion
m
. When turning the upper drum manually, hold the cover
of the measurement gauge by your hand to not come to
turn the gauge with the drum rotation.
. The number of the video heads are to measure as follows:
DNW-A100/A100P:
DNW-A50/A50P/A45/A45P: 14 heads
1. Turn the upper drum manually counterclockwise (3)
very slowly to approach a video head aside of the
probe. (Refer to <A> in Figure 4.)
2. Read the dial gauge pointer. (= Ha)
n
The scale of the dial gauge is 2 µm (0.002 mm) pitch.
Clockwise: +. Counterclockwise: _.
3. Turn the upper drum manually counterclockwise (3)
very slowly to center the video head in the probe.
(Refer to <B> in Figure 4.)
4. Read the dial gauge pointer. (= Hb)
5. Calculate the real head tip protrusion Hr with the Ha
and Hb.
Hr = Hb _ Ha
6. Calculate the head tip protrusion Hr for all heads with
steps 1 through 5 performing .
7. Measure and calculate the real head tip protrusion Hr
for all heads again.
n
Do it two times for fear of measuring error.
Dial gauge
0
(Ex, Ha=2)
Video head A
Probe
< A >
Hr = Hb _ Ha
= 40 _ 2
= 38 (µm)
Figure 4. Example of Head Tip Protrusion Measurement
DNW-A100/A50/A45
DNW-A100P/A50P/A45P
22 heads
Dial gauge
0
40
(Ex, Hb=40)
Video head A
Probe
< B >
This table is in measure order of the heads.
Head tip protrusion (Hr = Hb _ _ _ _ _ Ha)
Head
Spec.
µ
name
(
m)
First time
Dummy
_
(No need for measurement)
PB A3
*
22
=
PB A4
22
=
*
PB B3
22
=
PB B4
22
=
Y-A
20
=
C-A
20
=
*
PB A5
22
=
PB A6
22
=
*
PB B5
22
=
PB B6
22
=
Erase
_
(No need for measurement)
REC A
24
=
REC B
24
=
PB A7
*
22
=
PB A8
22
=
*
PB B7
22
=
PB B8
22
=
Y-B
20
=
C-B
20
=
PB A1
*
22
=
PB A2
22
=
*
PB B1
22
=
PB B2
22
=
*: Video heads for DNW-A100/A100P only
Removal of Head Tip Protrusion Measurement
Gauge
1. Turn the upper drum manually counterclockwise (3)
very slowly to move a video head aside from the probe.
2. Loosen the adjustment screw fully (by turning it
counterclockwise).
3. Lift up the positioning flange from the outer circum-
ference of the drum's upper surface to a few millime-
ters, and then lift the measurement gauge slowly and
remove it while pushing two legs against the outer
circumference of the drum's upper surface (applying
force slightly to the measurement gauge in the direc-
tion indicated by arrow A). (Refer to Figure 3.)
n
Perform carefully and slowly so that the probe of a
measurement gauge does not touch the outer circum-
ference or video head on the drum.
5-3. Video Head Tip Protrusion Check
Second time
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5-15

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