IBM Selectric Service Manual

to achieve proper contact operation and timing.
Contact Make
Break
C2 Njo
C7 N/C·
20° 1: 3°
120' + 3°
15° ± 10'
CR Intlk N/C
195
0
+ 0'_20
0
1. Print Cycle Contact C2
a. Form the N/C support so that the O/pIS I ift the
N/C contact .002" to .005" from the N/C
support (Figure 5-4).
b. Preliminary adjustment of N/O support strop is
for.030" to .040" air 'gap between O/P and
N/O contact. Adjust for correct timing after
adjustment C.
c. Position the contact mountinf:l brocket so that the
O/P clears the com (at the low point .002" to
. 010" (Figure 5-4).
NOTE: N/C must break 3-9 degrees before N/O makes.
.002" to .010"
Cam
.030" to .040"
t-.;~-O/P
NjO Support
N/C Support
Mtg. Brkt.
FI GURE 5-4. Print Feedback Contact C2
2.
Shift Contact Assembly C-7
a. Adjust the C-7 mounting bracket so the cam
follower stud wi II be .002" to .010" from the
com with the shift
ratchet latched home (Figure
5-5). Be sure the follower stud is centered
vertically on the camming surface.
b. Adjust the N/O contact airgap for the 3 to 9
degrees transfer ti me.
c. Adjust the cam for contact timing.
5-3
N/O Contact
FI GURE 5-5. Shift Contact Assembly C-7
3. Carrier Return Interlock Contact
a. Form the N/C support so that the O/P I ifts the
N/C contact .002" to .005" (Figure 5-6) .
N/C Contact
alp
N/c Support
FIGURE 5-6. Carrier Return Interlock Inactive
b.
o
With the carrier return clutch latched I position
the mounting bracket so that the N/C contact
opens .035"-.045" (Figure 5-7).
Mtg. Brkt.
FI GURE 5-7. Carrier Return I nterlock Active
Index and Paper Release Mechanisms
The index and paper release levers have no linkage attached
to them. The levers are spring-loaded rearward to the base
tie rod.
Adjust the index pawl stop forsingle line space and be sure

IBM Selectric Specifications

General

Brand	IBM
Model	Selectric
Category	Typewriter
Language	English