SAL2875 - Sony Digital Camera Service Manual (repair manual)

SAL2875 (2.8/28-75 SAM) (28-75mm F2.8 SAM)

1.0

2009.11

Official Release

—

—

1.1

2009.11

Revised-1
(A1 09-316)

• 

Correction of DISASSEMBLY.

  Japanese: 

• 

Correction of HELP.

  Japanese: 

• 

Correction of ADJUSTMENTS.

  Japanese: 

Yes

1.2

2015.07

Revised-2
(A2 14-326)

• Change of ADJUSTMENTS.
  English: 

  Japanese: 

Yes

2015G08-1

  © 2015.07

分解図につきましては，英語版を
ご参照下さい。

Revised-2

Replace the previously issued 
SERVICE MANUAL 9-852-724-12 
with this Manual.

SAL2875 (2.8/28-75 SAM) (28-75mm F2.8 SAM)

2

This lens is equipped with a distance encoder. The distance encoder allows more accurate measurement (ADI) by using a flash 
for ADI.
Depending on the lens mechanism, the focal length may change with any change of the shooting distance. The focal length as-
sumes the lens is focused at infinity.

*1

42-112.5
*1  The values for equivalent 35mm-format focal length is based on Digital Single Lens Reflex Cameras equipped with an 

APS-C sized image sensor.

14-16

*2

75

°

-32

°

*2

54

°

-21

°

*2  The value of angle of view 1 is based on 35mm-format cameras, and that of angle of view 2 is based on Digital Single Lens 

Reflex Cameras equipped with an APS-C sized image sensor.

*3

0.38 (1.3)
*3  Minimum focus is the shortest distance from the image sensor to the subject.

0.22

f/32

67

×

Approx. 77.5 

×

 94 (3 1/8 

×

 3 3/4)

Approx. 565 (20)

Lens (1), Front lens cap (1), Rear lens cap (1), Lens Hood (1), Set of printed documentation

Designs and specifications are subject to change without notice.

Amount of focus 
movement
(1.564mm)

Aspheric Lens

Extra-Low Dispersion Glass

1st Group Assy
(33.492mm)

2nd Group Assy
(5.158mm)

3rd Group Assy
(16.785mm)

4th Group Assy
(22.719mm)

Amount of focus movement
(3.254mm)

WIDE

TELE

•

•

概略仕様

このレンズは距離エンコーダーを搭載しています。距離エンコーダーとは、高精度な調光（

ADI

調光）を

ADI

対応フラッシュとの組

み合わせで実現する機能です。
レンズの機構によっては、撮影距離の変化に伴って焦点距離が変化する場合があります。記載の焦点距離は撮影距離が無限遠で
の定義です。

判換算焦点距離

*1

42-112.5
*1 

ここでの

35mm

判換算焦点距離とは、

APS-C

サイズ相当の撮像素子を搭載したデジタル一眼レフカメラでの値を表します。

レンズ群一枚

14-16

画角

*2

75

°

-32

°

画角

*2

54

°

-21

°

*2 

画角

1

は

35mm

判カメラ、画角

2

は

APS-C

サイズ相当の撮像素子を搭載したデジタル一眼レフカメラでの値を表します。

最短撮影距離

*3

0.38
*3 

最短撮影距離とは、撮像素子面から被写体までの最短距離を表します。

最大撮影倍率

倍

0.22

最小絞り

f/32

フィルター径

67

外形寸法（最大径

×

長さ）

約

77.5 

×

 94

質量

約

565

同梱物

レンズ

(1)

、レンズフロントキャップ

(1)

、レンズリアキャップ

(1)

、レンズフード

(1)

、印刷物一式

仕様および外観は、改良のため予告なく変更することがありますが、ご了承ください。

フォーカス移動量
(1.564mm)

非球面レンズ

ED 

(特殊低分散)ガラス

1群組立
(33.492mm)

2群組立
(5.158mm)

3群組立
(16.785mm)

4群組立
(22.719mm)

フォーカス移動量
(3.254mm)

WIDE

TELE

•

•

SAL2875 (2.8/28-75 SAM) (28-75mm F2.8 SAM)

1-1

Some chemicals used for servicing are highly volatile.
Their evaporation caused by improper management affects your health and environment, and wastes resources.
Manage the chemicals carefully as follows.

Store chemicals sealed in a specific place to prevent from exposure to high temperature or direct sunlight.
Avoid dividing chemicals into excessive numbers of small containers to reduce natural evaporation.
Keep containers sealed to avoid natural evaporation when chemicals are not in use.
Avoid using chemicals as much as possible. When using chemicals, divide only required amount to a small plate from the con-
tainer and use up it.

Be careful to the following points for exterior parts used in this unit.

Use a piece of cleaning paper or cleaning cloth for cleaning exterior parts. Avoid using chemicals.
Even if you have to use chemicals to clean heavy dirt, don t use paint thinner, ketone, nor alcohol.
Insert the specific screws vertically to the part when installing a exterior part.
Be careful not to tighten screws too much.

This unit uses unleaded solder. 
Boards requiring use of unleaded solder are printed with the lead free mark (LF) indicating the solder contains no lead.
(Caution:

  Some printed circuit boards may not come printed with the lead free mark due to their particular size.)

: LEAD FREE MARK

Be careful to the following points to solder or unsolder.

Set the soldering iron tip temperature to 350 

°

C approximately.

If cannot control temperature, solder/unsolder at high temperature for a short time.
Caution:

  The printed pattern (copper foil) may peel away if the heated tip is applied for too long, so be careful!

Unleaded solder is more viscous (sticky, less prone to flow) than ordinary solder so use caution not to let solder bridges occur 
such as on IC pins, etc.

Be sure to control soldering iron tips used for unleaded solder and those for leaded solder so they are managed separately. Mix-
ing unleaded solder and leaded solder will cause detachment phenomenon.

•
•
•
•

•

•

•

•

After correcting the original service problem, perform the following safety checks before releasing the set to the customer.

1.  Check the area of your repair for unsoldered or poorly-soldered connections. Check the entire board surface for solder splash-

es and bridges.

2.  Check the interboard wiring to ensure that no wires are  pinched  or contact high-wattage resistors.
3.  Look for unauthorized replacement parts, particularly transistors, that were installed during a previous repair. Point them out 

to the customer and recommend their replacement.

4.  Look for parts which, through functioning, show obvious signs of deterioration. Point them out to the customer and recom-

mend their replacement.

5.  Check the B+ voltage to see it is at the values specified.
6.  Flexible Circuit Board Repairing

Keep the temperature of the soldering iron around 270 

°

C during repairing.

Do not touch the soldering iron on the same conductor of the circuit board (within 3 times).
Be careful not to apply force on the conductor when soldering or unsoldering.

Danger of explosion if battery is incorrectly replaced.
Replace only with the same or equivalent type.

0

0

0

•
•
•

SAL2875 (2.8/28-75 SAM) (28-75mm F2.8 SAM)

2-1

Make sure that the flat cable and flexible board are not cracked of bent at the terminal.
Do not insert the cable insufficiently nor crookedly.

When remove a connector, don t pull at wire of connector. It is possible that a wire is 
snapped.

When installing a connector, don t press down at wire of connector. 
It is possible that a wire is snapped.

Do not apply excessive load to the gilded flexible board.

In case of the following notches or holes are located in the lens block, etc during disassembling/
assembling the lens, Use the universal wrench.

Notches

Holes

Universal wrench
J-6082-609-A

Chip-A for 
universal wrench:
J-6082-609-1

Chip-B for 
universal wrench:
J-6082-609-2

Chip-C for
universal wrench:
J-6082-609-3

Attach the chip-A, chip-B or chip-C to the universal wrench.
For the notches:  chip-A, chip-C
For the holes: 

chip-B

Match the universal wrench to the holes or notches of the lens block, etc.

Notches

Chip-A

or

Chip-C

Chip-A

or

Chip-C

Chip-B

Chip-B

Chip

Fixed screw

Fixed screw

Chip

Match the universal wrench 
to the width of holes or notches.

Universal wrench

Holes

G-116

G-22

G-36

A-20

B-10

B-40

B-110

G-48

G-62

G-85

Anti-diffusion Agent (A-20) : 

Adhesive Bond (B-40) :

Grease (G-22):

Grease (G-48) :

Grease (G-85):

Grease (G-116):

J-6082-611-A

J-6082-614-A

J-6082-665-A

J-6082-669-A

J-6082-626-A

J-6082-628-A

Adhesive bond (B-10):

Adhesive Bond (B-110) :

Grease (G-36) :

Grease (G-62) :

J-6082-612-A

J-6082-617-A

J-6082-667-A

J-6082-670-A

•

•

•

•

Cut and remove the part of gilt 
which comes off at the point.
(Be careful or some 
pieces of gilt may be left inside) 

Cut and remove the part of gilt 
which comes off at the point.
(Be careful or some 
pieces of gilt may be left inside)