TCI Library www.telephonecollectors.info
AT&T Private Pay Phone Plus
February, 1988
3. Temporarily Connect 24V Power Cable to Phone
• Using a wire stripper, strip about 2 inches of the outer jacket from one end of the
electrical power cable .
• If the rubber grommet in the back of the telephone is not already split, use a pair of
scissors or utility knife to cut the grommet from the hole part way up and from the
hole part way down. The power cord must be threaded through the grommet. (For
additional help, see Figure 10.) The grommet is there to keep out moisture and dust,
so do not cut a larger slit than necessary.
• If a terminal block is used on the power supply board, strip 1/4 inch insulation from
the red, yellow, green, and black power cable wires. Then loosen the terminal
block's connection screws labeled CT,
U, and L2. See Figure 3. If your telephone
is equipped with a power switch, be sure it is set to the OFF position.
• Insert wires into the following connection terminals:
red and yellow wires into connection terminal CT
green wire into connection terminal L1
black wire into connection terminal L2
• Pull gently on the wires to confirm the connection.
• Ground the phone housing. This is an important part of the procedure. If you are
not sure how to ground the housing, see "Grounding the AT&T Private Pay Phone
Plus" in Section Ill.
Figure 3 Connect Power Cable
GROUND SCREW
~-,,,c--::al ____ RED a YELLOW/CT-----...._
------- GREEN/L1-----r""'.U.
ff~,_ _____ BLACK/L2----'
......._ ____
L TERMINAL BLOCK
I
I hlrii~~~~
i
. '
9~ ;
COIN VAULT DOOR
0
Owner-Manual
Page 14
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