Panasonic PV-M2738 Operating, Service Manual

Page: 30 / 151

2-9
View A
Head Amp C.B.A.
IC2601
CAUTION:
HOT during
operation
Guide Pin
Guide Pin
Screw with
Washer (A)
Screw with
Washer (A)
Screws (A)
View A
1 Cylinder
Unit
Head Amp
C.B.A.
Unsolder
Through Hole
P3502
P3503
Screws with Washers (A)
Chassis
Cylinder Unit
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
Center
1mm
38 Grounding Plate
Unit
Cylinder Shaft
Black Screw (A)
Rotating
Direction
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
1) 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).
2) 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).
3) 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).
4) Solder connectors (P3502 and P3503).
3. Adjustment of Grounding Plate Unit
1) 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
2) After installing, perform the "Tape Interchangeability
Adjustment" procedures.