DSLR-A500, DSLR-A550 - Sony Digital Camera Service Manual (repair manual). Page 23

DSLR-A500/A550_L2

3-2

#93: M1.7 X 3.5 (Tapping) 
 (Silver)
 3-254-082-01

3.5

1.7

#93: M1.7 X 3.5 (Tapping) 
 (Silver)
 3-254-082-01

3.5

1.7

#23: M1.7 X 4.0 (Tapping)
 (Black)
 3-080-204-11

4.0

1.7

#23: M1.7 X 4.0 (Tapping)
 (Black)
 3-080-204-11

4.0

1.7

3.9

2.0

#164: M2.0 X 3.9
 (Black)
 3-268-954-11

#64: M1.7 X 5.0 (Tapping)
 (Silver)
 2-666-551-21

5.0

1.7

1-5.  Charge Base Plate B Assy

Charge Base Plate B Assy

1-6.  Mirror Driving Spring

1-8.  Shutter Charge Lever Spring

1-7.  Mirror Driving (SP) Retainer

1-9.  Adjustment Plate Retainer

1-12. A Mount Lug Plate (Lower)

A Mount Lug Plate (Lower)

Adjustment Plate Retainer

Mirror Driving (SP) Retainer

Boss

Hole

Screw

1-10. BL Contact Holder Unit, BL Dust Protect Sheet

1-13. Iris Joint Gear, Aperture Unit
∗ The Aperture Unit is supplied by being set in the charge position 
  (initial position), but if this position is disordered when the Aperture 
  Unit is removed, or if the charge position is to be set again, perform 
 as follows.
∗ Refer to "1-14. Aperture Unit Charge Position Setting" for the confirm 
  method at the charge position.

1-15. Aperture Unit Free Position Setting
∗ Set the Aperture Unit to a free position once, if the gear was rotated 
  accidentally and the charge position is disordered, or if the charge 
  position was shifted during disassembly.

1-14. Aperture Unit Charge Position Setting
1. Check that the Aperture Unit is in a free state.
2. After confirming that the Aperture Unit is in a free state, rotate the 
  gear by 3 turns.
3. After rotating the gear by 3 turns, set the Aperture Unit where the 
  holes in the gear and the Aperture Unit coincide. This position is the 
 charge 

position.

 

∗ Refer to "1-15. Aperture Unit Free Position Setting" for the setting 

    and the confirm method at the free position.

1-11. AF Driving Unit

AF Driving Unit

BL Dust Protect Sheet

Mirror Charge Lever Assy

- Right View -

- Front View -

- Back View -

- Right View -

- Right View -

- Right View -

- Right View -

Mirror Driving Spring

Screw

Shutter Charge Lever Spring

∗ Note the direction. 

Screw

Boss

Boss

Claw

Boss

Screw

- Front View -

Screw

1 Iris Joint Gear

3 Screw

2 Aperture Unit

- Front View -

AF Driving Unit Flexible 
Board Arrangement

Boss

Soldering

- Left View -

In a free state, the edge of this spring 
will move up and down about 1 mm if 
the gear is moved a little.

Gear rotating 
direction to make 
the unit free

Gear rotating 
direction to set 
the charge position

In a free state, a hole in the gear almost 
coincides with a hole in the Aperture Unit.

Note: The spring is deformed and cannot 
 

be used if the gear is rotated too 

 

much from a free state.

If the edge of spring is located downward,
rotate the gear in the arrow direction to
search a free position.
∗ In a free position, the edge of spring is
 located upward.

First, check the 
spring edge position.