AT&T Bell System Plant Series Service Manual page 2

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SECTION 502-541-41 0
2.09
Mounting cords of later manufacture feature
a slotted wafer strip (Fig. 2) to facilitate
replacement.
INSULATED SPADE
TIPS~
Fig. 2-Siotted Wafer Strip End of Mounting Cord,
Later Type
Lamps and Pushbuttons
2.10
Replace cracked pushbuttons or collars.
Remove accumulated dirt or film from lamps,
collars, and pushbuttons with a water dampened
cloth. Do not use solvents of any kind. If
cleaning does not correct binding of pushbuttons,
replace button and collar assembly.
2.11
To replace defective lamp:
(1) Remove dial from mounting bracket.
(2) Lift lamp from socket with KS-6320 orange
stick.
(3) Align lamp contact surface when placing
new lamp in socket.
(4) Remount dial.
2.12
The button and collar assembly should be
carefully aligned to avoid interference with
removal or replacement of housing.
Page 2
Loose Number Card Retainers
2.13
If the P-25E785 number card retainer becomes
so loose on the faceplate that the 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 1/2-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-Type Key
2.14
Field maintenance of the 589H key (Fig. 3
and 4) consists of:
eCleaning contacts with a 265C tool.
eReplacing loose or missing damper studs
with P-18A859 vibration damper sleeves
(Fig. 4). Later 589-type keys do not require
this vibration damper.
2.15
Contact follow and separation is obtained
by using a 363 tool at a point adjacent to
contact spring pile-up (Fig. 4). When adjusting
springs:
(a) There should be a minimum spring clearance
of 1/64-inch between contact springs and
those parts of the key which do not make contact
with springs (Fig. 4).
(b) Normally open contacts should make with
perceptible follow on locking keys before key
plunger assumes locked position.
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