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Sony SAL20F28 - Wide-angle Lens - 20 mm, Service Manual

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Sony SAL20F28 - Wide-angle Lens - 20 mm Service Manual Download Page 9

2-2

SAL20F28 (2.0/28) (20mm F2.8)

2-1.

DISASSEMBLY

2-1-1. FOCUS RING, FRONT LENS BARREL AND FIXED TUBE

EXPLODED VIEW

Note: 
Remove the decoration ring using the name 
ring wrench C (72 mm).
Name ring wrench C (72 mm):
J-6082-634-A

Name ring wrench C (72 mm)

HELP01

HELP13

3

 Front Lens 

     Barrel

4

2nd Lens 
Block

X

T

HELP02

5

 Focus 

     Ring

HELP03

(See Page 2-3.) 

X

T

R

U

Z

Y

Z

R

U

Y

2

 1st Lens

     Block  
  

1

 Decoration

     Ring

6

 Outer Barrel Hold

     Plate

7

Outer Barrel

Ver 1.2  2007.05

Summary of Contents for SAL20F28 - Wide-angle Lens - 20 mm

Page 1: ...nk Revision History Revision History How to use Acrobat Reader How to use Acrobat Reader Sony EMCS Co SAL20F28 2 0 28 20mm F2 8 Ver 1 2 2007 05 LENS FOR DSLR CAMERA 2007E0800 1 2007 05 Published by Kohda TEC 9 852 113 12 US Model Canadian Model AEP Model Chinese Model SAL20F28 2 0 28 20mm F2 8 ...

Page 2: ...ngle of view 2 1 70 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 Minimum focus m feet 3 0 25 0 8 3 Minimum focus is the shortest distance from the image sensor to the subject Maximum magnification 0 13 Minimum f stop f 22 Filter diameter mm 72 Dimensions maximum di...

Page 3: ...ty Check out 1 2 1 5 Troubleshooting 1 3 2 DISASSEMBLY 2 1 Disassembly 2 2 3 REPAIR PARTS LIST 3 1 Exploded Views 3 1 3 2 Supplied Accessories 3 6 4 ADJUSTMENTS 4 1 Preparations 4 1 4 2 Aperture Diameter Check Adjustment 4 4 4 3 Projective Resolving Power Check 4 9 4 4 Flange Back f F Check Adjustment 4 12 4 5 Lens ROM Check 4 16 4 6 Error Code List 4 17 ...

Page 4: ...y 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 1 3 Unleaded Solder 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 ...

Page 5: ...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 SAFETY RELATED COMPONENT WARNING COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED LINEWITH MARK 0 ON THE SCHEMATIC DIAGRAMS AND IN THE PARTS LI...

Page 6: ...eration of the preset ring and replace the defective part Perform the aperture diameter adjustment See page 4 7 Perform the aperture diameter check See page 4 4 NG Check operation of the diaphragm control block OK OK OK Function NG F No NG Aperture trouble Replace the defective part NG NG NG END OK Perform the aperture diameter check See page 4 4 ...

Page 7: ...cus trouble Replace the defective part or apply the grease Check the coupler Check the outer barrel and focus ring NG NG NG NG NG END OK Check the installation of the main flexible unit reinstall the main flexible unit Check pattern of the main flexible unit Clean the pattern of the main flexible unit Replace the main flexible unit Check the foecusing operation again ...

Page 8: ... that a wire is snapped Do not apply excessive load to the gilded flexible board UNIVERSAL WRENCH In case of the following notches or holes are located in the lens block etc during disassembling assembling the lens Use the universal wrench How to Use Attach the chip A or chip B to the universal wrench For the notches chip A For the holes chip B Match the universal wrench to the holes or notches of...

Page 9: ...the decoration ring using the name ring wrench C 72 mm Name ring wrench C 72 mm J 6082 634 A Name ring wrench C 72 mm HELP01 HELP13 3 Front Lens Barrel 4 2nd Lens Block X T HELP02 5 Focus Ring HELP03 See Page 2 3 X T R U Z Y Z R U Y 2 1st Lens Block 1 Decoration Ring 6 Outer Barrel Hold Plate 7 Outer Barrel Ver 1 2 2007 05 ...

Page 10: ...TSIDE BARREL 1 Lens Mount Riveting Block HELP06 HELP14 EXPLODED VIEW 3 Rear Light Shield Barrel HELP05 HELP04 HELP09 4 Main Flexible Unit Lens Mount Block HELP07 HELP08 5 Coupler B C A D 2 Main Spring See Page 2 4 A B D C 6 Outside Barrel FLANGE BACK ADJUSTMENT 7 Back Adjustment Washer ...

Page 11: ...3 CAM RING UNIT AND INNER TUBE EXPLODED VIEW B E B E 5 Diaphragm Control Block HELP10 HELP12 4 3rd Lens Block 3 Cam Ring Unit HELP11 APERTURE DIAMETER ADJUSEMTNT E 1 Guide Pin 2 Cam Ring Guide Roller C F D A C F F D A D Ver 1 2 2007 05 ...

Page 12: ...fix the front ring with the three screws tentatively as shown in the figure 2 Attach the 1st lens block 3 Perform the 4 2 1 Aperture Diameter Check 4 After the aperture diameter check is completed remove the 1 group lens block tentatively Apply the adhesive bond B 40 to the three screws and tighten them as shown in the figure Apply the adhesive bond B 40 3 areas Front Lens Barrel Red Mark Distance...

Page 13: ...ate with the guide mark of focus scale window unit Note Be sure to turn the focus ring clockwise when aligning 3 Tighten the three screws as shown in the figure and apply the adhesive bond B 10 to the screw head as shown in the figure Distance index Outer Barrel Focus Ring Front Lens Barrel Apply the adhesive bond B 10 Screw Apply the adhesive bond B 10 3 areas Focus Ring Scratch Focus Scale Plate...

Page 14: ...h it to the outer barrel 2 Apply the anti diffusion agent A 20 to the instruction portions of the outer barrel 3 Attach the outer barrel and outer barrel hold plate as shown in the figure Apply the adhesive bond B 40 to the three screws and tighten them as shown in the figure Apply the adhesive bond LOCTITE 460 Outer Barrel Apply anti diffusion agent A 20 All circumference Outer Barrel Apply the a...

Page 15: ... hook of rear light shield barrel and the hook of preset ring 2 Install the rear light shield barrel to the lens mount riveting block apply the adhesive bond B 40 to the screwed portions of screws and tighten screws 3 Install the ground spring to the rear light barrel and then the signal board Note Be careful not to tighten screws too strongly Confirm that the preset ring moves smoothly Rear Light...

Page 16: ...gent A 20 and grease G 85 to the instruction portions of the lens mount riveting block 3 Attach the lens mount riveting block and check the operation of the aperture blade Turn the cam ring unit and check the movement of the coupler HELP07 Grease G 80 J 6082 625 A Grease G 85 J 6082 626 A Apply the grease G 85 to the gear and the grease G 80 to the sliding surfaces of the coupler Apply the anti di...

Page 17: ...the preset ring pin and the hole for axis meet the position as shown in the figure 4 Turn the outside barrel clockwise eliminating play and tighten four screws Note After performing 4 4 2 Flange back f F adjustment apply the adhesive bond B 40 to the screwed portions of screws and tighten screws Apply the adhesive bond B 40 Apply the adhesive bond B 40 Back Adjustment Washer Apply the anti diffusi...

Page 18: ...reset ring to the aperture operating plate unit pin the hole for coupler to the coupler and attach the lens mount riveting block 3 Turn the lens mount riveting block counterclockwise eliminating play and tighten four screws in order as shown in figure 1 2 3 4 Aperture Operating Plate Unit Pin Coupler Lens Mount Riveting Block Hole for Coupler ...

Page 19: ...nit so that the clearance between the pin of the aperture operation plate unit and the edge of the longitudinal hole of the inner barrel may become around 1 mm 7 Attach the aperture unit holding spring and check the operation of the aperture blade Note When attaching the aperture unit holding spring insert the portion B first 8 After the aperture diameter adjustment is completed apply adhesive bon...

Page 20: ...le for the width of the groove on the focus cam ring Apply the adhesive bond B 40 to the cam ring guide roller Tighten the three cam tube guide rollers into three places 5 Check that the fixed cam ring moves smoothly B B C A C A Apply the grease G 15 All circumference Apply the grease G 15 3 areas Apply the adhesive bond B 40 Apply the adhesive bond B 40 Cam Ring Unit Fixed Cam Ring Cam Ring Guide...

Page 21: ...cam ring unit Apply the adhesive bond B 40 to the guide pin and pass the selected guide roller through the guide pin and then tighten it Tighten the three guide pins into three places 3 Check that the fixed cam ring rotates smoothly and inner barrel moves smoothly Pin of the aperture operation plate unit Cam Ring Unit Inner Barrel position Apply the adhesive bond B 40 Inner Barrel Cam Ring Unit Gu...

Page 22: ... plate onto the decoration ring 2 Remove the masking tape of the front decoration plate Note Tolerance 2 5 1 mm HELP14 Oil O 20 J 6082 610 A Apply small amount of oil O 20 to the instruction portion of the main spring Aplly small amount O 20 On contact area Masking Tape Front Decoration Plate Decoration Ring Range Index Ver 1 2 2007 05 ...

Page 23: ...55 01 OUTER BARREL HOLD PLATE NOTE XX and X mean standardized parts so they may have some difference from the original one Items marked are not stocked since they are seldom required for routine service Some delay should be anticipated when ordering these items The mechanical parts with no reference number in the exploded views are not supplied 11 2 684 117 01 SCREW M1 6 X 4 0 12 2 691 944 01 SHEE...

Page 24: ... LIGHT SHIELD BARREL 56 2 687 685 01 SCREW M2 0 X 4 0 57 A 1212 861 A BLOCK LENS MOUNT RIVETING 58 2 684 244 01 STOPPER SCREW 59 2 691 960 01 MAIN SPRING Ref No Part No Description 60 2 691 959 01 RING PRESET RING 61 2 684 234 01 PRESET RING HOLDING PLATE 62 2 685 022 01 COUPLER 63 2 691 919 01 SCREW SET SCREW A 64 2 691 961 01 BARREL OUTSIDE BARREL 65 2 887 835 01 TAPE FLEXIBLE SET 66 Selection p...

Page 25: ... 691 932 01 INNER BARREL Ref No Part No Description Note 1 The number or type of these parts need to be selected according to adjustment etc Select the part referring to page 3 5 106 A 1197 614 A CAM RING UNIT 107 2 691 954 01 GUIDE PIN 108 Selection parts GUIDE ROLLER A to I Note 1 109 Selection parts CAM RING GUIDE ROLLER A to E Note 1 101 See Page 3 4 102 103 106 B E B E B 104 105 109 107 108 1...

Page 26: ... Part No Description 151 A 1197 611 A 1ST LENS BLOCK 152 A 1202 190 A 2ND LENS BLOCK 153 A 1197 613 A 3RD LENS BLOCK 154 2 691 928 01 G3 4 STOPPER 155 2 691 929 01 G5 STOPPER 156 2 691 930 01 G8 STOPPER 157 2 691 931 01 G9 10 STOPPER 151 152 153 G1 G3 G7 G8 G9 G2 G4 G6 G5 G10 154 156 155 157 ...

Page 27: ...A D1 5 03mm D2 4 53mm 2 691 946 01 GUIDE ROLLER B D1 5 03mm D2 4 52mm 2 691 947 01 GUIDE ROLLER C D1 5 03mm D2 4 51mm 2 691 948 01 GUIDE ROLLER D D1 5 02mm D2 4 53mm 2 691 949 01 GUIDE ROLLER E D1 5 02mm D2 4 52mm 2 691 950 01 GUIDE ROLLER F D1 5 02mm D2 4 51mm 2 691 951 01 GUIDE ROLLER G D1 5 01mm D2 4 53mm 2 691 952 01 GUIDE ROLLER H D1 5 01mm D2 4 52mm 2 691 953 01 GUIDE ROLLER I D1 5 01mm D2 4...

Page 28: ...CTION SPANISH AEP 2 685 159 51 MANUAL INSTRUCTION DUTCH AEP 2 685 159 61 MANUAL INSTRUCTION SWEDISH AEP 2 685 159 71 MANUAL INSTRUCTION ITALIAN AEP 2 685 159 81 MANUAL INSTRUCTION PORTUGUESE AEP 2 685 159 91 MANUAL INSTRUCTION RUSSIAN AEP 2 685 160 11 MANUAL INSTRUCTION TRADITIONAL CHINESE SIMPLIFIED CHINESE AEP CH 2 685 160 21 MANUAL INSTRUCTION KOREAN AEP Abbreviation CH chinese model 2 687 234 ...

Page 29: ... is downloadable from the ESI homepage Fig 4 1 1 Ver 1 2 2007 05 20 30 40 50 60 70 80 90 0 10 Personal computer Note 1 AE master lens J 6082 597 A Flange back gauge 43 50mm J 6082 608 A Flange back tester J 6082 606 A A mount attachment J 6082 607 A Lens test projector J 6082 605 A Note 3 1000 mm Collimator 110V J 6082 604 A 240V J 6082 604 B Note 2 USB cord with connector 1 833 062 11 Luminance b...

Page 30: ...ed Hard disk free area 15 M Byte or more recommended USB terminal Standard equipment Graphics 32 000 colors or more recommended VGA monitor Note 2 Attach the chart to the 1000 mm collimator as shown in Fig 4 1 2 Fig 4 1 2 Note 3 Connect the variable transformer Output voltage AC 100 V to the lens test projector Align the marks 1000 mm collimator Chart ...

Page 31: ...top cover of the camera DSLR A100 service manual 9 852 130 51 Note Store the lens adjustment program LensAdjustment exe and related file AlphaLensAdjust txt in the folder that contains the DSLR A100 adjustment program DSLRadj_cs exe 2 Start the Lens Adjustment Program 1 Connect the camera and PC with the USB cord with connector 2 Set the mode dial of camera to M 3 Turn the POWER switch of the came...

Page 32: ...wn in Fig 4 2 2 Fig 4 2 2 3 Shoot the images under the following conditions and save them Note Shoot the center of the luminance surface three times with the master lens and checking lens Setting of Luminance box Luminance EV12 Setting of Lens Luminance box Luminance EV12 Camera ISO 100 Exposure Mode M shutter Speed 1 125 Aperture F5 6 Focus Mode MF Metering Center weighted Preset white balance Tu...

Page 33: ... the Color Calculator 2 Fig 4 2 3 2 Read the image from the file menu Fig 4 2 4 3 Set the Color Calculator 2 as follows Measured value display Display menu RGB L a b Measuring method Display menu Center Single Area Fig 4 2 5 Color space Edit menu sRGB Fig 4 2 6 Area size for calculate Edit menu Option 256 256 Pixels Fig 4 2 7 ...

Page 34: ...shoot with checking lens b Fig 4 2 8 3 Checking Method 1 Calculate aperture error using the following formula and check that the aperture error is within the specification Aperture error Average G value of master lens a Average G value of checking lens b Specification Aperture error 30 5 2 When the aperture error is out of specification perform 4 2 2 Aperture Diameter Adjustment Calculate button C...

Page 35: ...d Adhesive bond B 10 Name ring wrench 72mm 1 Adjustment Method 1 Disassemble or assemble the checking lens into the state of Fig 4 2 9 Fig 4 2 9 2 Remove the adhesive bond fixing the iris aperture unit holding spring Fig 4 2 10 2nd Lens Block Front Lens Barrel 1st Lens Block Decoration Ring Adhesive bond B 10 3 areas Adhesive Bond Aperture Unit Holding Spring Adhesive Bond Iris Retainer Ring Ver 1...

Page 36: ...dhesive bond B 10 as shown in the Fig 4 2 13 Fig 4 2 13 6 Assemble the lens completely 7 Perform 4 2 1 Aperture Diameter Check and repeat 4 2 1 Aperture Diameter Check and 4 2 2 Aperture Diameter Adjust ment until the aperture error is within the specification Set the preset ring at the open aperture position Preset lever Aperture Unit Holding RIng Aperture blades are hidden into the edge competel...

Page 37: ... 7 to 0 87 Table 4 3 1 1 Perform the following steps 1 to 3 and incorporate the internal lenses of the lens test projector according to the checking focal length 1 Open the lid of the lens test projector 2 Pull up and turn the fixed levers on the right and left sides of the lens test projector 3 Remove or insert the lens Note Be sure to have the right position and direction of the lens Fig 4 3 1 L...

Page 38: ...o ON Fig 4 3 2 4 Turn the focus ring of the checking lens until the chart image projected on the screen is the sharpest at the center y 0 5 Set the plane mirror to the center of the projected image y 0 and adjust the projector position so that the mirror reflects the light to the center of the lens Distance Lens test projector Chart Fan switch Lamp switch Plane mirror Screen A mount attachment Che...

Page 39: ...es which appears on screen when focus is beyond maximum revolving power Do not confuse spurious resolution for the smallest pitched lines Fig 4 3 4 4 Check that the all readings y 0 saggital S and meridional M at y 15 is within the specification of the Table 4 3 2 When the specification is not satisfied perform the following procedure Replace the 1 group lens block 2 group lens block and 3 group l...

Page 40: ...nt attachment and hold them together 4 Turn the focusing knob of the flange back tester so that fine scratches on the flange back gauge 43 50mm is the sharpest Note Turn the knob in the direction of the arrow of Fig 4 4 2 for correct reading Fig 4 4 2 5 Turn the scale ring of the dial gauge until the long pointer indicates 0 Note This position is the flange back f F 43 5 mm Memorize the position o...

Page 41: ...e chart center Refer to Fig 4 4 4 Note Figure shows example The cause depends on individual lens Fig 4 4 4 4 Calculate the flange back f F of the checking lens using the following formula and check that the specification of the Table 4 4 1 is satisfied Flange back f F of the checking lens Flange back gauge Number of short pointer revolution Reading of long pointer Specification Focal length f F mm...

Page 42: ... and measure the thickness of back adjustment washer with micrometer or calipers Then select a back adjustment washer with suitable thickness When the shift amount x is the negative value decrease the thickness of back adjustment washer When the shift amount x is the positive value increase the thickness of back adjustment washer Back adjustment washer Part No Description 2 691 962 01 Back adjustm...

Page 43: ...lace the back adjustment washer referring to step 1 2 of adjustment method and check flange back again 5 After the adjustment is completed remove the rear light shield barrel and lens mount riveting block once Apply adhesive bond B 40 to the four screws and then fix the outer tube with four these screws Refer to HELP08 6 Attach the rear light shield barrel and lens mount riveting block Refer to HE...

Page 44: ...t the checking lens to the camera 2 Start the lens adjustment program LensAdjustment exe referring to 4 1 2 Lens Adjustment Program Fig 4 5 1 2 Checking Method 1 Click the Connect button on the lens adjustment program Note Click the End button to disconnect the USB connection then lens adjustment program will terminate 2 Check that the display of Lens Code and Model Name is correct Note Focus posi...

Page 45: ...ync with the number of check pattern Error No Lens Lens is not connected correctly Error Unknown Lens Unidentified lens is connected Communication Error Code E600 Communication error with the camera Code F000 Input data error to DLL file Code F100 Setting error of USB port Code 2531 Communication error of main signal on the camera ...

Page 46: ...pplied to the Service Manual depending on the date of issue Switching a page To move to the first page click the To move to the last page click the To move to the previous page click the To move to the next page click the Reversing the screens displayed once To reverse the previous screens operation one by one click the To advance the reversed screens operation one by one click the Application to ...

Page 47: ...orrection Page 2 2 Correction of Parts Name and spelling errors Ornamental Ring Decoration Ring Front Ornamental Plate Front Decoration Plate ADJUSTMEN ADJUSTMENT Polyster Tape Black 10mm Polyester Tape Black 10mm focusi ring focus ring Mirror Tube Front Lens Barrel Prest Ring Pin Preset Ring Pin S M Correction Page 2 2 2 4 3 1 HELP02 HELP08 HELP13 Description of Service Tool S M Correction Page 4...

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