unit on a desk, table, etc. within 25 feet of the
jack and within 10 feet of a grounded power outlet
supplying 120 volts ac, 60 Hz.
Ensure that the power cord
is
connected
to an ac outlet not under control of
a switch.
3.02
Arrange control unit so front is located at
least six inches from table edge and with
its loudspeaker facing the audience. For optimum
performance, there should be no obstructions at
the front, rear, or within one foot of the sides of
the unit.
3.03
Install telephone line cord, ac power cord,
and, as required, microphones or auxiliary
TOUCH-TONE dial telephone set to the appropriate
jacks located on rear of control unit (Fig. 2).
.111111001�1111�0011111111
Fig.
2-738
Control Unit, Rear View
3.04
Provision is made for reproducing both
transmitted and received signals over a
customer-owned public address system. A public
address adjustment (PA ADJ) (Fig. 2) control is
located on the back of the set for adjusting the
level of the transmitted signal at the PA terminals.
Connections to the public address system are made
to the screw terminals on the bottom of the unit
(Fig. 3).
Connections should be made using a
shielded pair, grounded at the customers' equipment
only.
If desired, the conference set loudspeaker
ISS
2,
SECTION
5 12-630- 11 1
can be deactivated by opening the shorting link
between adjacent screw terminals on the base of
the control unit (Fig. 3).
Connection to and
adjustment of the PA system is the customer's
responsibility. Typical signal levels are-45dbv at
600-ohm impedance (balanced).
A- REAR HOUSING ASSY CAPTIVE SCREW ACCESS HOLES
B-
MICROPHONE AND FRONT HOUSING ASSY SCREWS AND
CAPTIVE SCREW ACCESS HOLE
Fig.
3-738
Control Unit, Bottom View
3.05
When the conference set is not in use or is
being moved to another location, store the
components and control unit in the carrying case.
3.06
When installed behind a 1A1, 1A2, or 6A
KTS, the A and Al leads from the KTS
should be connected to the T1 and R1 leads,
respectively, of the control unit to obtain A lead
control.
There are several ways to connect the
50A1 to a key system termination.
(1) A special connector (F-Specification 59888)
can be ordered separately with a modular
plug at the 50A1 end and a 153-type adapter
wired to pick up tip, ring, A and Al leads at
the key system end.
Page
3
BSP
S12·630·111-102_1979-QS-03.jpg Scanned by Frank Harrell, {Cowboy Frank) Castle Rock, Colorado Feb 16,2012 23:01:01
