Sony DSLR-A300 Service Manual ▷ View online
2-18
DSLR-A300_L2
2-5. IRIS RING REMOVAL/INSTALLATION
Removal
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.
At this time, do not rotate the iris joint gear of the Aperture Unit.
Installation
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).
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.
2-6. APERTURE UNIT INSTALLATION
* 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.
2-7. 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 "2-8. Aperture Unit Free Position Setting" for the setting and the confirm method at the free position.
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.
will move up and down about 1 mm if
the gear is moved a little.
Gear rotating
direction to make
the unit free
direction to make
the unit free
Gear rotating
direction to set
the charge position
direction to set
the charge position
Note:
The spring is deformed and cannot
be used if the gear is rotated too
much from a free state.
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.
*
rotate the gear in the arrow direction to
search a free position.
*
In a free position, the edge of spring is
located upward.
located upward.
First, check the spring edge position.
In a free state, a hole in the gear almost
coincides with a hole in the Aperture Unit.
coincides with a hole in the Aperture Unit.
As viewed from gear
(Hole in the gear)
(Hole in the gear)
2-8. APERTURE UNIT FREE POSITION SETTING
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.
the charge position was shifted during disassembly.
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DSLR-A300_L2
2-9. LEVERS AND GEARS INSTALLATION
Follow the assembly in the numerical order given.
2-9-1. MIRROR CHARGE/SHUTTER CHARGE LEVERS INSTALLATION
2-9-2. SHUTTER CAM/MIRROR CHARGE/IDLE GEARS INSTALLATION
1
Mirror Charge Lever Assy
Mirror Charge Lever Assy
Main Mirror
Holder Boss
Holder Boss
Spring
4
Screw (#93)
2
Shutter Charge
Lever
Lever
Shutter Charge
Lever
Lever
3
Charge Base
Plate C Assy
Plate C Assy
- Levers Position -
Shutter Cam Gear Assy
Idle Gear
Mark
Hole
Hole
Hole
Hole
Hole
Mirror Charge Cam Gear
- Gears Position -
Mirror Box
Rib
Rib
Main Mirror
Holder Down
Holder Down
1
Shutter Cam
Gear Assy
Gear Assy
3
Idle Gear
2
Mirror Charge
Cam Gear
Cam Gear
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DSLR-A300_L2
2-9-3. CHARGE BASE PLATE B INSTALLATION
2-9-4. MIRROR DRIVING (SP) INSTALLATION
Hole
Hole
1
Charge Base Plate B Assy
2
Screw (#93)
Mirror Charge Cam Gear
- Spring Position -
Mirror Driving (SP)
1
Mirror Driving
(SP)
(SP)
2
Mirror Driving
(SP) Retainer
(SP) Retainer
3
Screw (#93)
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