Mark IV University Sound 1800-40 Operating Instructions

University
Sound Inc.
a MARK IV company
COMMERCIAL
SOUND
PRODUCTS
WARNING: TO PREVENT FIRE OR SHOCK HAZARD, DO
DESCRIPTION
The Raymer Mode! 1800-40 is a monaural solid state
amplifier with a power output of 40 watts RMS. This
versatile unit is designed for dependable continuous
operation in background music, public address, paging
and sound reinforcement systems.
This amplifier has provisions for mixing four inputs.
They are identified as three microphone inputs and one
music input. The three microphone inputs are low
impedance balanced. Alternate inputs on these micro-
phone channels are provided as follows: MIC-1 may be
changed to balanced line input by means of a switch on
the back panel. MIC-2 and MIC-3 will provide a high
impedance unbalanced input by using an alternate input
jack. MIC-3 channel may be used as an AUX input by
means of a selector switch on the front panel.
The MUSIC channel may be input by one of two sources
as selected by means of a switch on the front panel. This
channel features a MUSIC MUTE circuit which may be
used to fade out the music when paging. This Automatic
Music Mute feature mutes the Music Channel when a
signal is present on any of the microphone inputs. Screw
terminals are provided to mute the music by means of a
remote switch and/or disconnect the automatic mute
feature.
Power output connections are made by means of screw
terminals on the back of the unit. Output connections
include 4 and 8 ohm for use when making direct speaker
voice coil connections, as well as 25 Volt and 70 Volt lines
for speaker distribution systems.
The amplifier is housed in a sturdy steel cabinet
measuring 13-%" x 10-%" x 3-%" which may be rack
mounted by use of the Raymer Model RPK-2 rack
mounting kit. The unit operates from a standard 120 Volt
MODEL 1800-40 AMPLIFIER
UNPACKING
INSTALLATION
Each Raymer amplifier has ample vents for normal
cooling by means of air circulation and should be installed
in a manner which permits free air flow around the unit.
DO NOT PLACE ANY OBJECT ON TOP OF THE UNIT
WHICH WILL BLOCK THE AIR FLOW OF THESE VENTS.
DO NOT STORE OR OPERATE THE UNIT IN A HOT
AREA WHERE THE TEMPERATURE EXCEEDS 140° F.
The unit may be mounted in a standard 19-inch rack by
using a Raymer Model RPK-2 rack panel kit. These kit
require a vertical height of only 5-4".
The power required to operate this unit is 105-120 volts
AC 60 Hz. The AC power cord on the unit has 3 prongs and
must be connected into a matching 3-wire grounded
outlet to provide a safety ground for the receiver. An AC
receptacle is provided on the rear panel of the receiver to
provided power for accessory equipment. This receptacle
is controlled by the POWER on-off switch so that the
accessory equipment is turned on and off with the
amplifier.