IBM Selectric I/O Reference Manual page 55

Interposer Latch Bracket
~
_Interposer Latch Position
~1~._-----,
Armature Agai nst
Backstop
\1~V-~1"-=-r~
Clearan~r_:~~=~
OPtD~~:~:r~~~rure
Ui III1U
Oper. Magnet
FIGURE
128.
Trip Link
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).
3.
Adjust the interposer switch actuator latch for the fol-
lowing conditions.
a. So that it wi II c lear 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 machi ne (Fig. 131).
.010" rXimum
.~:r.nimum
T
FIGURE
131.
FIGURE
132.
interposer Switch Actuator 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-S)
OIP
FIGURE
129.
Operational Contacts
2.
With the interposer tripped and to the rear
I
adjust the
interposer swi tch mounting bracket
I
front to rear
I
so
that the tri pped interposer wi II transfer the swi tch con-
tacts' then move the bracket an additional .01S" to
.02S" (Fig. 130). .
rnterposer
(Un latched)
Move An
Additional
/'"II~-.OlS"
to .025"
After Contact
T ra ns ferred
FIGURE 130. Contact Mounting Bracket
2-40
1. Contact Removed - Form the
NIC
support so that the
OIP
lifts the
N/C
point
.002"
to
.OOS"
(Fig.
133) .
• 002"
to
OOS " Ri'se/: N/C
Support
N/C
CiS~t~ft
e \
I
FIGURE
133.
Contact Removed
2.
Unit Installed - Position the
alP
centrally over the aux-
i liary cam follower (Fig.
134). -
~
Auxiliary
rc-cam
Follower
I
O/P
FIGURE
134.
Contact Insta lied
CAUTiON: If the contact assembly is mounted too far
forward the backspace latch may operate the contact
which can cause up to 30
0
difference in timing. This
problem can only be seen by scoping.
3. Form the contact mOIJnti ng bracket (up or down) for make
and break times. Refer to the timing chart for timing.