Fig. 12-P-900052 Guard Assembly, Installed
Lamps and Pushbuttons
3.09
Replace cracked pushbuttons or collars.
Remove accumulated dirt or film from lamps,
collars, and pushbuttons with a water dampened
cloth.
·
DO NOT USE SOL VENTS OF ANY
KIND.
If cleaning does not correct binding of
pushbuttons, replace button and collar assembly.
3.10
To replace defective lamp:
(1) Remove dial from mounting bracket.
(2) Carefully lift lamp from socket with KS-6320
orange stick.
(3) Align lamp contact surfaces when placing
new lamp in socket.
(4) Remount dial.
3.11
The button and collar assembly should be
carefully aligned to avoid interference with
removal or replacement of housing.
Loose Number Card Retainers
3.12
Current production TOUCH-TONE sets are
equipped with P-25E803 and P-269561 card
retainers, which cannot be adjusted.
3.13
If the P-25E785 (MD) number card retainer
becomes so loose on the faceplate that the
ISS 3, SECTION 502-500-120
number card or key designation strip slips, it can
be tightened as follows:
(1) Remove faceplate from set.
(2) Remove card retainer from faceplate.
(3) Bend the four arms of the retainer so that
more pressure will be applied to the number
card and designation strip. The bends should
be made approximately 112-inch in from the tabs
on the ends of the arms and in the opposite
direction from the factory bent tabs.
(4) Install the card retainer on the faceplate
and insert the number card and key designation
strip.
(5) Install faceplate on telephone set.
Note:
If adjusting the arms of the retainer
does not result in sufficient holding power,
replace the number card retainer.
589-
and 636-Type Keys
3.14
Field maintenance of the 589- and 636-type
keys (Fig. 1, 13, and 14) consist of:
•
Adjusting contacts with a 363 tool.
•
Cleaning contacts with a 265C tool.
•
Replacing loose or missing damper studs
with P-18A859 vibration damper sleeves
(Fig. 14). Later 589-type keys do not require
this vibration damper.
3.15
Contact follow and separation is obtained
by using a 363 tool at a point adjacent to
contact spring pile-up (Fig. 14). When adjusting
springs:
•
There should be a minimum spring clearance
of 1164-inch between contact springs and
those parts of the key which do not make
contact with springs (Fig. 14).
•
Normally open contacts should make with
perceptible follow on locking keys before
key plunger assumes locked position.
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