SECTION 502-500-120
Exclusion Switch
3.04
Perform no field maintenance on exclusion
switch and plunger other than cleaning
contacts with a 265C tooL
3.05
Replace set or exclusion switch assembly if
any of the following exclusion switch
requirements cannot be met:
•
Exclusion plunger should remain in the
operated position when pulled up to the
full extent of its stroke.
•
The plunger should return to the fully
depressed position when handset is replaced.
•
With housing removed, normally closed
contacts of the exclusion switch should have
perceptible follow when operated manually.
•
With housing removed, open contacts of
the exclusion switch should have minimum
separation of 1/64-inch; gauge by eye.
Mounting Cords
3.06
Replace mounting cords of early manufacture
(Fig. 9) as follows:
(1) Remove dial from its mounting bracket.
(2) Remove terminal screws.
(3) Disconnect spade-tipped conductors and wafer
sections.
(4) Disengage cord stay hook from right leg of
dial mounting bracket.
3.07
Mounting cords of late manufacture feature
a slotted wafer strip (Fig. 10) to facilitate
replacement.
3.08
Still later manufactured cords, designed for
use with 636-type key assemblies, feature
slotted wafer sections for each line appearance
(Fig. 11). This allows easy arrangement of lines
to pickup buttons.
t
No field m ai n t e n a n c e sh ould be
performed on the plug end of plug-ended
mounting cords.
Page
8
INSULATED SPADE TIPS
Fig. 10---Siotted Wafer Strip End of Mounting Cord,
Later Type
LINE AND
LAMP
Fig. 11-Mounting Cord Used With 636A Key
BSP
502-500·120·!03_1974-11-0S.jpg Scanned by Frank Harrell, (Cowboy Frank) Castle Rock, Colorado Feb 02,2012 18:59:58
