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2-18

DSLR-A300_L2

Rotate the iris ring clockwise, and remove it at the stop position (iris-in end).
At this time, do not rotate the iris joint gear of the Aperture Unit.

1.

With the Aperture Unit set in the charge position (see "2-7. Aperture Unit Charge Position Setting" ), install it on the front
frame set.
* The Aperture Unit has been set in the charge position, if it is not removed.
However, the iris ring must be in the removed state (where the iris joint gear is not rotated).

2.

Install the iris ring with it's a punch mark aligned with a line that connects the iris joint gear shaft and the optical axis center.

* 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 "2-7. Aperture Unit Charge Position Setting" for the confirm method at the charge position.

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 "2-8. Aperture Unit Free Position Setting" for the setting and the confirm method at the free position.

Iris Ring

Optical Axis Center

Iris Joint Gear Shaft

Punch Mark

2-19

DSLR-A300_L2

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

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.
*

First, check the spring edge position.

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

As viewed from gear
(Hole in the gear)

1.

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.

2-20

DSLR-A300_L2

Follow the assembly in the numerical order given.

1

Mirror Charge Lever Assy

Mirror Charge Lever Assy

Main Mirror
Holder Boss

Spring

4

Screw (#93)

2

Shutter Charge
Lever

Shutter Charge
Lever

3

Charge Base
Plate C Assy

Shutter Cam Gear Assy

Idle Gear

Mark

Hole

Hole

Hole

Hole

Hole

Mirror Charge Cam Gear

Mirror Box
Rib

Main Mirror
Holder Down

1

Shutter Cam
Gear Assy

3

Idle Gear

2

Mirror Charge
Cam Gear

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DSLR-A300_L2

Hole

Hole

1

Charge Base Plate B Assy

2

Screw (#93)

Mirror Charge Cam Gear

Mirror Driving (SP)

1

Mirror Driving
(SP)

2

Mirror Driving
(SP) Retainer

3

Screw (#93)