Sony SAL20F28 Service Manual ▷ View online
2-3
SAL20F28 (2.8/20) (20mm F2.8)
2-1-2. REAR LIGHT SHIELD BARREL, LENS MOUNT BLOCK AND OUTSIDE BARREL
1
Lens Mount Riveting Block
HELP06
HELP14
EXPLODED VIEW
3
Rear Light Shield Barrel
HELP05
HELP04
HELP09
4
Main Flexible Unit
Lens Mount Block
HELP07
HELP08
5
Coupler
B
C
A
D
2
Main
Spring
(See Page 2-4.)
A
B
D
C
6
Outside
Barrel
FLANGE BACK
ADJUSTMENT
ADJUSTMENT
7
Back
Adjustment
Washer
Washer
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
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