Panasonic Omnivision PV-9661, Service Manual

Page: 274 / 407

5.2.3. Cylinder Unit
5.2.3.1. Disassembly Procedure
1. Remove 3 Screws (A) and 2 Screws with Washers (A).
Then, lift the Cylinder Unit and the Head Amp C.B.A. out
from the mechanism.
2. Unsolder P3502 and P3503. Then, remove the Head Amp
C.B.A.
Note:
Use extreme care when removing or replacing the Cylinder
Unit. Do not touch the Video Heads during servicing.
CAUTION:
When removing the Cylinder Unit, avoid touching IC2601
on the Head Amp C.B.A. because it is HOT during
operation.
Fig. J2-1
5.2.3.2. Reassembly Notes
1. Use extreme care when removing or replacing the Cylinder
Unit. Do not touch the Video Heads during servicing.
2. Installation of Cylinder Unit
a. Install the Cylinder Unit so that the 2 holes on the lower
surface of the Cylinder Unit fit over the 2 Guide Pins on
the Cylinder Base and loosely secure it with 3 Screws
(A).
b. Install the Head Amp C.B.A. so that the hole on the
Head Amp C.B.A. lines up with the hole on the chassis
and secure it with 2 Screws with Washers (A).
c. Position the Cylinder Unit so that foil patterns of
connectors (P3502 and P3503) and Head Amp C.B.A.
are aligned, and tighten 3 Screws (A).
d. Solder connectors (P3502 and P3503).
3. Adjustment of Grounding Plate Unit
a. After installing, make sure that the Grounding Plate Unit,
on the bottom side of mechanism chassis, is positioned
on the right side of the Cylinder shaft so that the center
line of the plate is just less than 1.0 mm measured from
the center of the Cylinder shaft.
If required, adjust the plate position by loosening Black
Screw (A).
Never install the Grounding Plate Unit on the left side of
the Cylinder shaft.
Incorrect positioning will cause cylinder buzz.
Fig. J2-2
b. After installing, perform the "TAPE
INTERCHANGEABILITY ADJUSTMENT (FINAL
ADJUSTMENT)" procedures.
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PV-9661 / PV-9662