•
GSA or G8B handset for noisy locations
Polarity Guard
2.32
P olarity guards should be installed in
TOUCH-TONE sets only when specified by
local instruction for end-to-end signaling when
battery and ground reversals are encountered.
2.33
Mount the P-90D052 guard assembly to the
right dial mounting bracket as shown in
Fig. 12.
Fig. 9-Nonslotted Wafer Strip End of Mounting Cord,
Early Type
2.34
A polarity guard can not be mounted in a
1563 or 2563 series telephone set.
1P2Lamps
2.35
The 1P2 key telephone system requires the
use of a dual envelope lamp (KS-20673) on
PICTUREPHONE® lines to indicate whether an
audio or video call is being processed.
2.36
The same pair of wires is used to control
the KS-20673 lamp as is used for the 51A
lamp. The voltages are under the control of the
PICTUREPHONE line circuit. The lamp is inserted
so that the white lamp is illuminated on audio calls
( -10 volt DC from the line circuit) and the red
lamp on video calls
( +
10 volt DC from the line
circuit). This test should be made by the installer
before fully inserting the lamp.
ISS 3, SECTION 502-500-120
Speakerphone
Note:
When speakerphone feature is provided
the A25B connector cable should be used.
2.37
In nonspeakerphone installations, it is necessary
for the installer
to
disconnect the speakerphone
leads (violet-green, green-violet, violet-brown,
brown-violet, violet-slate, and slate-violet) whenever
these sets are multipled with other sets supplying
speakerphone.
3.
MAINTENANCE
Components
3.01
Maintenance of handsets, dials, and ringers
is outlined in sections c o v ering these
components.
Removing and Replacing Housing
3.02
Sets without exclusion:
•
To remove housing, loosen captive screws
in base of set. Lift housing up and toward
front of set.
•
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.
3.03
Sets with exclusion:
•
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.
•
To replace housing, guide lower front portion
of housing over pushbuttons, align housing
with base of set, and gently press housing
in place.
•
Depress exclusion plunger. With slight
pressure it should snap into its unoperated
position.
•
Operate exclusion plunger several times to
insure proper operation. Tighten captive
screws in base of set.
Page 7
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