Sony SAL20F28 Service Manual ▷ View online
2-4
SAL20F28 (2.8/20) (20mm F2.8)
2-1-3. CAM RING UNIT AND INNER TUBE
EXPLODED VIEW
B
E
B
E
5
Diaphragm Control Block
HELP10
HELP12
4
3rd Lens Block
3
Cam Ring Unit
HELP11
APERTURE DIAMETER ADJUSEMTNT
E
1
Guide Pin
2
Cam Ring Guide
Roller
C
F
D
A
C
F
F
D
A
D
Ver 1.2 2007.05
HELP
SAL20F28 (2.8/20) (20mm F2.8)
HELP
Note for assembling and grease applying positions are shown.
HELP01
Adhesive bond (B-40): J-6082-614-A
1.
Align the red mark on the front lens barrel with the distance index on the distance scale window, fix the front ring with the three
screws tentatively as shown in the figure.
2.
Attach the 1st lens block.
3.
Perform the “4-2-1. Aperture Diameter Check”.
4.
After the aperture diameter check is completed, remove the 1 group lens block tentatively. Apply the adhesive bond (B-40) to the
three screws and tighten them as shown in the figure.
Apply the adhesive bond(B-40)(3 areas)
Front Lens Barrel
Red Mark ( )
Distance index on the Distance Scale Window
HELP
SAL20F28 (2.8/20) (20mm F2.8)
HELP02
Adhesive bond (B-10): J-6082-612-A
1.
Affix both ends of focus scale plate with tapes, aligning the end (
∞ side) of focus scale plate with the marking on focus ring.
2.
Attach the focus ring to the outer barrel and align the “center of infinity” of focus scale plate with the guide mark of focus scale
window unit.
Note:
Be sure to turn the focus ring clockwise when aligning.
3.
Tighten the three screws as shown in the figure, and apply the adhesive bond (B-10) to the screw head as shown in the figure.
∞
Distance index
Outer Barrel
Focus Ring
Front Lens Barrel
Apply the adhesive bond(B-10)
Screw
Apply the adhesive bond(B-10)(3 areas)
Focus Ring
Scratch
Focus Scale Plate
Polyester Tape (Black)
10 mm (8 x 40 mm)
10 mm (8 x 40 mm)
Polyester Tape (Black)
10 mm (8 x 40 mm)
10 mm (8 x 40 mm)
Ver 1.2 2007.05
HELP
SAL20F28 (2.8/20) (20mm F2.8)
HELP03
Adhesive bond (LOCTITE 460) (Note)
Note:
Use adhesive bond (LOCTITE 460) or an equivalent article.
Do not use what becomes white after drying like quick-drying glue.
Anti-diffusion agent (A-20): J-6082-611-A
Adhesive bond (B-40):
J-6082-614-A
1.
Apply the adhesive bond ((LOCTITE 460) to the back side of the mount index, and attach it to the outer barrel.
2.
Apply the anti-diffusion agent (A-20) to the instruction portions of the outer barrel.
3.
Attach the outer barrel and outer barrel hold plate as shown in the figure. Apply the adhesive bond (B-40) to the three screws and
tighten them as shown in the figure.
Apply the adhesive bond(LOCTITE 460)
Outer Barrel
Apply anti-diffusion agent(A-20)
(All circumference)
(All circumference)
Outer Barrel
Apply the adhesive bond (B-40)(3 areas)
Coupler Bush
Outer Barrel Hold Plate
Notch
Outer Barrel
Mount Index
Outside Barrel
Outer Barrel Plate
Notch the outer barrel
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