AT&T Bell System 2563HB Service Manual

SECTION 502-543-400
Issue 2, December 1972
SERVICE
2563HB TELEPHONE SET
1. GENERAL
1.01
This section provides maintenance and
connection information for the 2563HB
telephone set equipped with headset jacks and
12-button TOUCH-TONE@ dial for use with optional
12-button headset.
1.02
This section is reissued to:
• Include KS-20419LI buzzer, Fig. I
e
Show TIA ringer as replacement for NIA
ringer, Fig. 1
• Show 35Y3A dial as replacement for 35A3A
dial.
2. MAINTENANCE
Replaceable Component,
2.01
Field replaceable items are listed under
identification in the appropriate Reference
section in Division 502.
2.02
Maintenance of handsets and ringers is
outlined in sections covering these components.
Loose Card Retainers
2.03
The P-25E803 and P-26956I are nonadjustable
card retainers. The P-25E785 (MD) card
retainer is replaced by P-25E803.
2.04
If
P-25E785 (MD) card retainer becomes so
loose on the faceplate that the number card
or designation strip slips, they 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
ar,d insert the number card and 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 card retainer.
Removing and Replacing Housing
2.05
Sets without exclusion:
(a) To remove housing, loosen captive screws
in base of set. Lift housing up and toward
front of set.
(b) To replace housing, guide lower front of
housing over pushbuttons, align housing with
base of set, and gently press housing into place.
Tighten captive screws in base of set .
2.06
Sets with exclusion:
(a) To remove housing, pull up exclusion plunger
to its operated position, loosen captive screws
in base of set, and lift housing up and toward
the front of set.
(b)
To replace housing, guide lower front portion
of housing over pushbuttons, align housing
with base of set, and gently press housing in
place.
(c) Depress exclusion plunger. With slight
pressure it should snap into its unoperated
position.
(d) Operate exclusion plunger several times to
insure proper operation. Tighten captive
screws in base of set.
© Ameri~ Telephone and Telegraph Company, 1972
Printed in U.S.A.
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