Teletype 28 - Page 82

SECTION 573-118-700TC
3. 02 Si~nal Bell Contact Mechanism (Later Design)
(For Earlier Design see 4. 04)
~-----SIG!'.AL BELL CONTACTS
,.,..< I -~ BELL FUNCTION BLADE
(Front
View)
~--o-----CO!'.TACT I\lOUNTING BRACKET
BRACKET :.lOU!'.TING SCREWS
~ FUNCTION BOX FRONT PLATE
(B) CONTACT BRACKET ASSEMBLY
(1) Requirement
Note: See FUNCTION BLADE SPRING
adjustment (2. 49) for tension.
The contact assembly should be centrally
located over the bell function blade insulator.
(2) Requirement
With LETTERS code combination (12345)
selected, rotate main shaft until bell
function blade is in its lowest position
(resting on bellcranks). Gap between
contacts
Min 0. 015 inch---Max 0. 025 inch-------.
(3) Requirement
With bell function blade in its selected
position, the contacts should be closed.------.
To Adjust
With mounting screws loosened, position
contact bracket assembly. Tighten screws.
(A) SIGNAL BELL CONTACT
Note: Complete the following adjustments with
the signal bell contact assembly removed from
the function box front plate.
(1) Requirement
Contact springs should be approximately
parallel to top of bracket.------------....1
To Adjust
Bend contact spring.
(2) Requirement
(Left Side)
View)
CONTACT
GUARD
(Left Side
View)
Min 1-1/2 oz---Max 2-1/2 oz---------------1
with pull applied at contact point to open
contacts.
To Adjust
Bend upper contact spring.
Page 82
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