IBM Selectric - Operational Latch Bracket Removal; Shift Cam Removal

OPERATIONAL LATCH BRACKET REMOVAL
1. Remove the feedback-contact-assembly bracket by loosen-
ing the two screws (#1, Figure 47).
2. Remove the mainspring and hub (#2, Figure 47).
CAUTION: Care must be used when unwinding and re-
moving main spring.
3. Disconnect the backspace-latch spring (not shown).
4. Remove the back plate (#3, Figure 47).
5. Disconnect the backspace-rack spring (#1, Figure 48).
6. Disconnect the cam-follower spring (#2, Figure 48).
7. Disconnect the spacebar and tab-latch springs (#3, Fig-
ure 48).
8. Disconnect the tab-bellcrank I ink clevis (not shown).
9.
10.
11.
12.
7
~
2
3
Figure 47. Operational Latch Bracket Removal
Disconnect the detent spring (#4, Figure 48).
Disconnect the carrier-return latch spring (#5, Figure 48)
Remove
the index-selection link (#6, Figure 48).
Remove the carrier-return eccentric by removing the ec-
4 10 8
6 5
3 2 9
Figure 48. Operational Latch Bracket ReI oval
centric nut (
lt
7, Figure 48).
13. Remove the escapement link (#8, Figure 48).
14. Disconnect the carrier-return actuating spring and carrier-
return actuating-arm spring (#9, Figure 48).
15. Remove the escapement-torque-bar restoring spring (#10,
Figure 48).
16. Remove the two mounting screws (the left one is not vis-
ible) and one nut (#11, Figure 48).
17. Work the operational-latch bracket out of the machine.
18. The following adjustments should be checked after the
operational-latch-bracket is replaced.
a. C5 and C6 Timing
b. Mainspring Tension
SHIFT CAM REMOVAL
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
Turn the typehead counterclockwise and remove the re-
laxed rotate tape from the shift-arm pulley and put it
around the ti It pulley.
Remove the lower-case armature spring (#1, Figure 49).
Remove the cam-follower spring (#2, Figure 49).
Loosen the set screws and remove the cam follower arm
(#3, Figure 49).
Remove the three springs (#5, Figure 49).
Remove the interlock C-clip (#6, Figure 49).
Remove the detent (#7, Figure 49).
Remove the C -cl i p from the shaft and remove the ratchet
(#8, Figure 49).
Disconnect the shift link (#9, Figure 49).
Remove the shift-release arm (#10, Figure 49).
Remove the shift-clutch spring (behind the ratchet).
NOTE: Observe the spring position for replacement.
Remove the shift arbor (#11, Figure 49). NOTE: Do not
rotate the shaft backward.
Remove the shift cam (#12, Figure 49).
The following adjustments should be checked after the
shift-cam is replaced.
a. All shift mechanism adjustments
b. Shift Magnet Assembly
c. Upper Case Typehead Homing
6 10
II 12 8
Figure 49. Shift Cam Removal
3-14