Teletype 28 Manual page 109

3. 33
Universal Contact (Selector) Mechanism
(A) CONTACT MOUNTING BRACKET
Requirement
The drive arm linkage should be ver-
tically aligned to prevent binds.
To Adjust
Position the contact mounting bracket
with its mounting screws loosened.
Tighten screws.
CONTACT
'1"1
BLOCK
CONTACT BLOCK
MOUNTING SCREWS
ISS 8, SECTION 573-115-700TC
(B) CONTACT BLOCK
Requirement
The contact faces should be in a
vertical straight line.
To Adjust
Loosen two contact mounting screws.
Press contact block toward rear of
typing unit firmly against screws
and tighten screws.
(C) CONTACT DRIVE ARM POSITION
Requirement
The contacts should open equally
r-------
within 0. 010 inch.
To Check
CONTACT MOUNTING
BRACKET
·H'
I
CONTACT
ARM
Rotate codebar clutch until it is
disengaged and latched in stop posi-
tion. Measure gap between upper
contacts. Trip codebar clutch and
rotate 180 degrees or until lower
contact gap reaches its maximum
BRACKET
MOUNTING SCREW
(Right Side View)
CONTACT
ARM
·opening. Measure the gap.
To Adjust
Position contact drive arm with its
clamp screw loosened. Tighten
screw.
DRIVE ARM
CLAMP SCREW
(D) CONTACT ARM SPRING
Requirement
With shoulder screw which connects
contact arm to drive link removed and
spring scale applied vertically upward
or downward
L--------Min 2 oz---Max 5 oz
to open either contact.
CONTACT ARM SPRING
(Right Side View)
Page
109