How To Replace A Rotary Upper Drum; How To Remove A Rotary Upper Drum; How To Attach A New Rotary - Sony SLV-478 Service Manual

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2. HOW TO REPLACE A ROTARY
UPPER DRUM (HiFi MODEL)
See below for note.
2-1.

HOW TO REMOVE A ROTARY UPPER DRUM

Remove screw 1 (+P3 × 8) and remove the ground shaft
1)
assembly 2. (Refer to Fig. 4.)
2) Remove soldering which is marked by arrow and remove the
rotary upper drum board completely.
Remove two screws 3 (PSW3 × 8) and remove the rotary
3)
upper drum in the direction of A. (Refer to Fig. 5.)
If removal is difficult, remove it while rotating it slowly.
Note: If removal is difficult, check again if soldering is removed
completely.
2 Ground shaft assembly
1 Screw (+P3 × 8)
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L 13942296513
NOTE : There are two types of drum assembly built in the HiFi models.
[Discrimination]
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Drum when viewed
from the top
Soldering
Soldering
4 Plate
spring
Fig. 4
UPPER DRUM ASSEMBLY
DZR-45-R
(8-848-576-02)
—Top View—
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There are two printed circuit boards
on the top.
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2-2. HOW TO ATTACH A NEW ROTARY UPPER
DRUM
1) Pay attention so that finger print or like must not be put when
inserting a new upper drum into lower drum.
2) Align mark of the rotary upper drum board with the mark of
the rotary transformer board so that the screw hole on the upper
drum and that on the lower drum are aligned. (Refer to Fig. 5.)
3) If attaching is difficult, attach a upper drum while rotating it
slowly.
Note: Pay attention not to damage the video heads.
Confirm that the upper drum is inserted completely.
Tighten the two screws 3 (PSW3 × 8). (Refer to Fig. 5.)
4)
Fix the earth shaft 2 by tightening the screw 1 (+P3 × 8) so
5)
that protrusion at the tip of the earth shaft contacts the center
of the drum shaft.
Note: When attaching the ground shaft assembly 2, never give
force to the plate spring 4.
3 PSW3 × 8
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DRUM ASSEMBLY
DZH-94A/Z-RP
(8-839-044-02)
—Top View—
co
.
There is no printed circuit board.
Note: It cannot be divided to two parts, the
upper and the lower drum assemblies.
— 7 —
9 4 2 8
Upper drum assembly
DZR-45-R (8-848-576-02)
0 5 8 2 9 9 4 2 8
A Align the two arrow marks.
Lower drum assembly
DZL-51B/J-RP (8-848-666-11)
Fig. 5
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