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5-3. Video Head Tip Protrusion Check
When performing the periodic maintenance or inspection,
measure the tip protrusion of the video heads using a head
tip protrusion measurement gauge to check them for the
upper drum assembly replacement.
If the tip protrusion of all heads are satisfying the follow-
ing specification and more, it enables to playing back on
the tape.
Head
PB heads for Betacam/Betacam SP format
PB heads for Betacam SX format
If the tip protursion of any one head is under the specitica-
tion, it is recommended that the upper drum assembly
should be replaced early before occurring the trouble at the
playing back.
For the upper drum replacement, refer to Section 5-2 in the
maintenance manual part 2, volume-1.
Tools
. Cleaning cloth:
. Cleaning fluid:
. Head tip protrusion measurement gauge: J-6530-650-A
. Torque screwdriver (6 kg.cm) (JB-5251): J-6252-510-A
. Torque screwdriver's bit (+2 mm, l = 75 mm):
DNW-A22/A22P
5-3-1. Head Tip Protrusion Measurement
Preparations for VTR
1. Remove the top plate. (Refer to Section 2-3-1.)
2. Remove the plate MD assembly.
(Refer to Section 2-4.)
3. Remove the cassette compatment.
(Refer to Section 2-5.)
4. Remove the brush slip ring assembly.
(Refer to Section 5-3-2.)
Specification
5. Clean the outer circumference and video heads of the
20 µm
upper drum (shaded portions in Figure 1).
22 µm
(Refer to Section 5-2-3 for the cleaning method.)
3-184-527-01
9-919-573-01
J-6323-420-A
Video heads
Preparations for Head Tip Protrusion
Measurement Gauge
This gauge is the precision equipment. Handle with care.
1. Loosen the adjustment screw fully (by turning it
counterclockwise).
2. Clean the probe, positioning flange, and portion
touching the drum of two legs. (Refer to Figure 3.)
n
Do not apply excessive force to the probe during
cleaning. If a deposit of µm order exists, measurement
cannot be performed accurately.
5-3. Video Head Tip Protrusion Check
Cleaning cloth
Figure 1. Cleaning of Drum
5-13
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