16.
EXP OUT
Jack
Connects audio and data to the EXP IN jack of an optional Telex®
ES-4000 expansion station.
17.
SPEAKERS
Output Jacks
Connects channel audio to the Input jacks of an optional Telex®
SPK-1000 Powered Speaker. May also be connected to the auxil-
iary input of an amplifier. These outputs should not be directly con-
nected to an unpowered speaker. Refer to the speaker setup
section in this manual.
18.
CHN 1
and
CHN 2
Intercom Channel Connectors
Each intercom channel has a pair of connectors (one male and one
female) for convenient interconnection of stations. Each pair of con-
nectors is wired together in parallel, providing a “loop through” at
each connector pin. Use one connector of each pair to connect to
the intercom power supply. Use the other connector of each pair to
run a cable to another user station.
CHANNEL TERMINATION
Each channel of the US-2000 must be terminated to prevent audio
oscillations. When a channel is connected to a Telex® power supply,
channel termination is provided within the power supply for that channel.
External channel termination must be installed when a channel is:
·
Used in a “dry-line” (non-powered channel) application
·
Unused and un-powered
If necessary, install external channel termination by connecting a 300
W
resistor across pins 2 and 3 of the intercom channel connector (either
CHN1
or
CHN2
) at the rear of the US-2000.
INTERNAL SWITCHES, JUMPERS AND ADJUSTMENTS
There are several internal switches, jumpers and adjustments that affect
operation. These are described below. To gain access to the switches,
jumpers and adjustments, remove one screw from the top of the cover
and two screws on each side. Switch, jumper and adjustment locations
8