SECTION 502-303-1 0
I
may be necessary between the dial light transformer
and the base.
Polarity Guards for 1220A and 1220B
should only
be
installed when instructed
by local administrative practices or
procedures for end-to-end signaling
purposes when battery and ground
reversals are encountered (Fig.
8).
ESISTORS NOT PROVIDED
ON CURRENT PRODUCTION
P-90D231 POLARITY
GUARD ASSEMBLY
Fig. 8-P-900231 Polarity Guard Assembly, Installed
3.06
To replace the housing on the AC1 base,
lift and hold the line switch plunger while
housing is placed on the backplate. Release plunger
so it will rest properly on the line switch arm of
the base assembly. Tighten the captive housing
screws and replace the number card and number
card retainer.
3.07
Insert the plug end of the D4BW, and D5AL
(Fig. 9) or D5AN mounting cord into the
jack located on the underside of the •AD1• base
assembly.
Make sure that the spring clip of
the plug snaps into place to secure the plug.
Lay the cord in the cord channel and slide the
cord retainer (early model) over the cord. Place
cord under stationary retainer on current models.
3.08
Connect the hand telep;tOne set to a telephone
base by plugging and H4DB or H5AA (tip
party identifying ground) cord in the jacks on each
component.
Page 6
Fig. 9-D5AL Mounting Cord
3.09
If tip party identification is required, an
H5AA cord must be used. Check under
P-82E800 cover of early production sets to see that
screw used in tip party identification switch is
tightened down. The absence of a screw or screw
hole, in the identification switch position (Fig. 10)
indicates that the connection has been made in
the network at the factory.
3.10
If message waiting lamp feature is required,
an H5AD handset cord must be used (Fig. 11)
the lamp equipped end of the cord plugs into the
hand telephone set. See Tables E, F, and
G
when
used with 1A1, 1A2, and 6A KTS.
When using pu
s
h-in-lock type plugs
make sure the contacts are in proper
position to make electrical connection
with the mating contacts, and that
the plug is placed in the proper
receptacle. Either error will cause
circuitry problems and extreme difliculty
in removing the plug.
3.11
Where a single dial light is involved, use a
2012A transformer. Select a 105-120 volt
ac receptacle not controlled by a switch. Use a
2A clamp to secure transformer to the outlet if
transformer is not a current production model
having folded-blade prongs. Where two or more
dial light sets are installed, refer to the section
on station transformers for use with multiple
installations.
SSP
5
0
2·3
0
3
-
101
-
i0
3
_
1972
-
0
9-06.
j
p
g
Scanned by Frank Harre((, (Cowboy Frank) Castle Rock, Colorado Jan 31,2012 21:49:52
