Sony SAL70400G Service Manual ▷ View online
4-12
SAL70400G (4-5.6/70-400 G SSM) (70-400mm F4-5.6 G SSM)
4. Selection and Installation of Preset Lever
1)
Select the preset lever, depending on the amount of back adjustment washer.
Preset Lever
Part No.
Amount of back adjustment washer (mm)
4-124-865-31
0.6 to 0.9 or less
4-124-865-41
0.9 or more
Table 4-5-5
2)
Install the preset lever and fix it with two screws.
3)
Perform the aperture diameter check/adjustment. (Refer to section 4-2.)
4)
Apply the adhesive bond (B-10) to the indicated portion of preset lever.
Fig.4-5-3
5)
Perform the adjustment method 1 (TELE end) again.
6)
Measure the flange back value at each focal length and confirm that the value satisfies the specifications in Table 4-5-1.
Apply the adhesive
bond (B-10)
bond (B-10)
Two Screws
Preset Lever
4-13
SAL70400G (4-5.6/70-400 G SSM) (70-400mm F4-5.6 G SSM)
4-6.
FOCUS-SHIFT (APERTURE (SPHERICAL ABERATION)) CHECK/ADJUSTMENT
In this section, the check/adjustment of focus-shift, which varies from the change of aperture, is described.
Equipment
• 1000 mm Collimator
• Flange Back Tester
• A-mount Attachment
• Flange Back Gauge (43.50mm)
• Aberration measuring cap 77mm (70400) (For TELE)
4-6-1. Focus-shift (Aperture (Spherical Aberration)) Check
1. Preparation
1)
Execute “LENS GENERAL ADJUSTMENT GUIDE 5. FOCUS-SHIFT CHECK (APERTURE (AMOUNT OF SPHERICAL
ABERRATION))”.
2. Checking Procedure
1)
Check the focus-shift (aperture (spherical aberration)) at TELE end (400mm) and confirm that the value satisfies the specification
below.
Specification: -0.17 to +0.2
2)
If the focus-shift of the inspecting lens does not satisfy the specification, perform “4-6-2. Focus-shift (Aperture (Spherical Aberra-
tion))”.
4-6-2. Focus-shift (Aperture (Spherical Aberration)) Adjustment
1.
Perform “dSB Check/Write”, using the lens adjustment program. (Refer to Finished Adjustment /Inspection 4-9-3. dSB Check/Write
dSB)
4-14
SAL70400G (4-5.6/70-400 G SSM) (70-400mm F4-5.6 G SSM)
4-7.
ZOOM BRUSH POSITION CHECK/ADJUSTMENT
Equipment
• Personal Computer
• Finished Inspection Fixture (AC 100V only)
• Lens Adjustment Program (ActuatorChecker)
1. Preparation
1)
Disassemble the checking lens or make the state shown in Fig.4-7-1 by assembling the checking lens.
Fig.4-7-1
2)
Attach the checking lens to the equipment. (Refer to LENS GENERAL ADJUSTMENT GUIDE Section 1-2 Fig.1-2-2.)
3)
Start up the lens adjustment program (ActuatorChecker).
4)
Click Setup and perform the initial setting. (Refer to LENS GENERAL ADJUSTMENT GUIDE Section 1-3.)
2. Check/Adjustment
1)
Set the zoom to the TELE end.
2)
Adjust the position of the brush as shown in the figure.
Note 1:
Adjust so that the cut portion A of the pattern on the Z encoder flexible board matches to the contact portion B of brush.
Note 2:
After adjusting the zoom brush, be careful for the position not to be shifted by its own weight when the zoom receives
shock.
Fig.4-7-2
Zoom Rubber
Zoom Brush
Polyester Tape
Insulating Tape
Zoom Brush Cover
Hole close sheet
Insulating Sheet
B
A
Match A to B
Zoom Brush
4-16
SAL70400G (4-5.6/70-400 G SSM) (70-400mm F4-5.6 G SSM)
4-8.
FOCUS BRUSH POSITION CHECK/ADJUSTMENT
Equipment
• Adhesive bond (B-10)
1. Preparation
1)
Disassemble the checking lens or make the state shown in Fig.4-8-1 by assembling the checking lens.
2)
Set the focus to the infinity end.
Fig.4-8-1
2. Adjustment
1)
Loosen two screws fixing the focus brush.
2)
Adjust the position of the focus brush as shown in the figure and fix it with screws.
Note: Adjust so that the cut portion A of the pattern on the F encoder flexible board matches to the contact portion B of brush.
3)
Confirm the conduction between 2nd pattern and 3rd pattern from top with a meter as shown in the figure.
• When the brush locates at the cut portion A of the pattern, there is no conduction. (Adjustment: OK)
• When the brush does not locate at the cut portion A of the trace, there is conduction. (Adjustment: NG)
Fig.4-8-2
4)
Rotate the focus from the infinity end to the near end and from the near end to the infinity end and confirm the position of the focus
brush.
5)
After finishing the adjustment, apply the adhesive bond (B-10) to the heads of screws.
Focus Brush
B
A
Match the position A to the position B
Focus Brush
Confirm the conduction
Apply the adhesive
bond (B-10)
bond (B-10)
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