Tokina AT-X Pro 80-200mm Focus repair

ID: 160304

Description: A lot of the screws are fastened with Loctite....

Steps:

1. Pick up your iFixit Toolkit and some tweezers.

2. bit: 1.5
3. quantity: 3
4. screws No. 1
5. item 1
6. remove item 1

7. Pick Lens No. 1 at the two outer notches and rotate it counter clockwise. Be not surprised that you need quite some force to loose it.
8. item 2
9. remove item 2

10. bit: PH00
11. quantity: 3
12. item 3
13. screws No. 2
14. remove item 3.

15. bit: PH00
16. quantity: 2
17. screws No. 3
18. item No. 4
19. loose item 4

20. bit: PH0
21. quantity: 3
22. screws No. 4
23. item 5
24. remove item 5

25. bit: PH0
26. quantity: 2
27. screws No. 5
28. item 6+7
29. remove item 6+7

30. bit: PH0
31. quantity: 3
32. screws No. 6
33. item 8
34. remove item 8

35. bit: PH0
36. quantity: 2
37. screws No. 7
38. item No. 9
39. remove item 9 very carefully!

40. item 10 (plastic foil)
41. remove item 10

42. bit: PH0
43. quantity: 4
44. screws No. 8

45. desolder these six joints.
46. keep a lot of attention for that loosen flexibel printed circuit (FPC). It leads to the shutter inside the lens. So be careful not to damage it. Otherwise the shutter won't work!

47. bit: PH0
48. quantity: 3
49. screws No. 9
50. item 11
51. Under the FPC ring you'll find the screws. Be careful not to damage the FPC!
52. Loose item 11

53. bit: PH0
54. quantity: 2
55. screws No. 10
56. item 11
57. Now, remove item 11.

58. item 12
59. remove item 12

60. bit: PH0
61. quantity: 3
62. screws No. 11
63. item 13
64. remove item 13

65. bit: PH0
66. quantity: 6
67. screws No. 12
68. item 14
69. You do not have to loosen the screw in the notch.
70. remove item 14

71. bit: PH0
72. quantity: 4
73. screws No 13
74. item 15

75. bit: PH0
76. quantity: 2
77. screws No. 14
78. item 16

79. bit: 2
80. quantity: 2
81. screws No. 15
82. item 16
83. remove item 16

84. bit: PH0
85. quantity: 6
86. screws No. 16
87. item 17 & 18
88. separate item 17 from 18

89. bit: PH0
90. quantity: 4
91. screws No. 17
92. item 19 & 20
93. remove item 19
94. then remove item 20

95. As you can see on the picture there is a lot of dirt in the winding of item 20. Also there were some sand particles. These damaged the windings so that I had to sand it. Be sure to clean it in detail afterwards and do not apply any grease or oil because it would increase the rotating force. That will impact the autofocus mechanism badly.

96. After you cleaned the focus ring, check whether item 20 rotates smoothly. If not you could clean it, too. But that means a lot of additional work because there are nearly 100 bearing balls.
97. item 21 is fixed with loctite to item 18. Use a cutter knife or similar to cut it.
98. grab item 21 at the two notches and rotate it counterclockwise to remove it.
99. Now item 20 is also loosened. Before you remove it be sure that the bearing balls that will fall out will not fall from your desk.