Operational Feedback Contacts - IBM Selectric Maintenance Manual

NOTE: Test this adjustment by manually attracting the
armature and turn ing the operational shaft so that the in-
terposer is being restored toward the front.
With all parts at rest (Fig. 128 .6) be sure a clearance exists
between the pull link and the armature.
Interposer Latch Bracket
_rl~g~-----
Interposer Latch Position
Operational Magnet
FIGURE 128.6 Trip Link
The pull I ink must be approximately 1/2 turn too long to
insure that the armature is moving prior to picking up the
load of the interposer • A trip I ink adjusted too short can
cause an intermittent operation or complete failure to re-
lease.
OPERATIONAL CONTACTS
1. The interposer switch shall be adjusted on its mounting
bracket so that the top of the switch is flush with the
bottom of the power frame (Fig. 129).
OIP
FIGURE 129. Operational Contacts
2. With the interposer tripped and to the rear, adjust the
interposer switch mounting bracket, front to rear, so
that the tripped interposer will transfer the switch con-
tacts, then move the bracket an addi ti ona I .015" to
.025" (Fig. 130).
fnterposer
(Un latched)
LnI'Tn'CT
Transferred
........... --.015" to .025"
After Contact
Transferred
FIG URE 130. Contact Mounti ng Bracket
3. Adjust the interposer switch actuator latch for the fol-
lowing conditi ons.
a. So that it will clear the bottom of the interposer
switch actuator by a maximum of .010" when the
bottom of the actuator is moving toward the front of
the machine (Fig. 131).
.010" Maximum
1
T
FIGURE 131.
Interposer Switch Actuator
.010" Minimum
'~
FIGURE 132. '
Interposer Switch Actuator
b. So that the latch will have a minimum of .010" over-
lap on the back of the switch actuator and shall pre-
vent the contacts from re-transferring unti I the check
pawl reseats in the check ring (Fig. 132).
Operational Feedback Contact (C-5)
1. Contact Removed - Form the
NIC
support so that the
OIP
lifts the
NIC
point .002" to .005" (Fig. 133).
.002/1 to
005 /1
Ri'se~
NIC
Support
N/ C
Ci~t2:F
e.
l
FIGURE 133. Contact Removed
2-40. 1