Bogen CHS100 Service Manual
LEAR
SIEGLER,
MODEL
100 WATT TRANSISTOR
PUBLIC
ADDRESS AMPLIFER
CHS100
.
IS1
INC.
INSTALLATION AND OPERATING MANUAL
READ THOROUGHLY BEFORE OPERATING EQUIPMENT
0
BOGEN
P.O.
PARAMUS, N. J. 07652
COMMUNICATIONS
BOX 500
DlVlSlON
DESCRIPTION
The Bogen Model CHSlOO is a fully transistorized
public address amplifier rated at 100 watts. The unit
will accommodate two microphone inputs and two
auxiliary inputs for a tuner, tape recorder, or phono-
graph with a ceramic cartridge. The amplifier will
accommodate either high or low impedance microphones, and no transformer is required to change from
one microphone impedance to the other.
An optional accessory designed to mount on the
front panel of the CHSlOO provides two additional
high or low impedance microphone inputs. A BRIDGING
receptacle on the rear panel accepts additional
level, ‘high-impedance signals from a unit having its
own volume control. such as a
corder or tuner. The BRIDGING receptacle can also
be used as a high-impedance output to feed a tape
recorder or auxiliary amplifier. The master volume
control will not affect the bridging output level.
preamplifier, tape
high-
re-
TECHNICAL SPECIFICATIONS
1
POWER OUTPUT: 100 watts at less than 5%
distortion.
PEAK POWER: 200 watts.
FREQUENCY RESPONSE: 40 to 20,000 Hz
SENSITIVITY: Hi Z MIC, 4 mv; Lo Z MIC, 0.3 mv;
AUX, 0.3 volt; Bridging, 1 volt.
HUM AND NOISE
65 db; AUX input, 70 db.
INPUTS: 2 MIC, high (100 K ohms) or low (200
ohms) impedance; 2 AUX (300
ing (high impedance).
OUTPUTS: 2, 8, 16 ohm speakers; 25 volt CT
balanced
or BOOSTER,
pedance at 0.5V.
(below rated output): MIC input,
(m);
70 volt balanced
10K
at 5V; Bridging, high im-
Kfi);
(4%);
±2
db.
Bridg-
TAPE
Individual volume controls are provided for each
microphone input. A fader volume controls selects and
adjusts the level of the desired auxiliary input and
permits fading between the two inputs. A master volume control regulates the mixed output level.
arate
bass and treble controls permit adjustments for
tonal balance.
Outputs are provided for 2, 8 and
and for 25-volt and
systems. Two quick-disconnect plugs provide rapid
and convenient connections to speakers. The output
of the CHSlOO amplifier can also be fed to a tape re-
corder or booster amplifier.
The CHSlOO amplifier operates from a 105-125
volt AC source, and has a total power consumption
of 150 watts. A 1.75-ampere circuit breaker protects
the amplifier against overloads.
CONTROLS: 2 MIC volume; 1 AUX volume (fader
for two inputs);
TREBLE tone; POWER switch and indicator.
TONE CONTROL ACTION: Treble (at 10 K Hz),
t 11 db to -12 db, Bass(at 50 Hz), +10 db to
-10 db.
POWER REQUIREMENTS: 105 to 125 volts, 50 or
60 cycles AC, 150 watts.
SEMI-CONDUCTORS: 10 silicon transistors, 2
diodes.
DIMENSIONS:
SHIPPING WEIGHT: 24 pounds.
15¼”
70-volt
balanced speaker line
MASTER volume; BASS,
wide x
lO½”
16-ohm
deep x
5½”
Sep-
speakers
high.
ACCESSORIES
PMA-2 ADD-ON PREAMPLIFIER
The Bogen Model PMA-2 Preamplifier is designed
to provide two additional microphone channels for the
CHSlOO amplifier. Each preamp channel has its own
volume control and will accommodate either high-impedance or low impedance microphones. The unit is
connected to the Preamp Accessory socket on the top
chassis of the CHSlOO amplifier. When installed, the
PMA-2 control knobs protrude through the front panel
of the CHSlOO amplifier.
WMT-I LINE MATCHING TRANSFORMER
The Bogen WMT-1 line input/line output matching
transformer is an accessory which has been designed
-2-
especially for matching
500/600
to a
former it may be used
distributing background music which has been transmitted over leased telephone lines. The, accessory
also functions as an output matching transformer in
feeding special program material over a 500/600 ohm
telephone line for transmission to a local broadcast
studio.
LVP-I ACCESSORY
The Bogen Model LVP-1 is a plug-in accessory
which permits the user to provide microphone precedence when used with a customer supplied switch
ohm line.
either inputs from or outputs
As an input matching
with the Bogen amplifier for
trans-
and the Bogen amplifier. The LVP-1 may also be used
as
a remote volume control in conjunction with the
Model RVC-1 remote volume control.
RVC-I REMOTE VOLUME CONTROL
The Bogen Model RVC-1 accessory permits the
amplifier to provide remote volume control when used
in conjunction with LVP-1 accessory.
MODEL LPC-4 PHONO PLAYER TOP
Model LPC-4 is a complete four-speed phono-
player designed to be mounted directly on top of the
amplifier. The unit comes complete with all necessary
hardware, and can be easily installed and connected
to amplifier with only a screwdriver. A tone arm
hous-
ing a dual-stylus turnover cartridge is included with
record player.
LK-IO CONTROL GUARD LOCKING PLATE
The Bogen Model LK-10 control guard locking
plate is designed to prevent unauthorized tampering
with the controls of amplifier. It comes complete with
two sets of keys. The key cannot be removed when
the lock is in open position.
RPK-27 RACK PANEL
The Bogen Model RPK-27 rack panel kit is designed to mount the
out the PMA-2 preamplifier) in a standard 19”
rack. The rack panel is finished in gray enamel.
INSTALLATION
UNPACKING power cables.
Inspect the shipping container and amplifier for
indications of improper handling. The amplifier was
carefully checked before leaving factory. If the unit
has been damaged, make an immediate claim to the
dealer
or distributor from whom it was purchased. If
the amplifier was shipped to you, notify the trans-
portation company without delay and place your claim.
CONNECTIONS BETWEEN COMPONENTS
For high-impedance inputs, use single-conductor,
low-capacity shielded wire for connecting the record
player, tape recorder, and other components to the
amplifier. Keep leads under ten feet in length.
For low-impedance microphone inputs, use
singleconductor shielded wire, in lengths from 50 to 500
feet depending on the characteristics of the microphone.
Speakers may be connected with standard flexible line cord (zip-cord), and up to 100 feet of cable
may be used without appreciable loss.
Make certain that all input cables are kept away
from speakers cables, power cables, and power trans-
formers, and that speaker cables are kept away from
POWER AND
The amplifier is furnished with an AC line cord
terminated in a three-prong plug. Plug the line cord
into a three-wire grounded outlet providing a nominal
120-volt, 50-60 cycle power source. This
the amplifier as well as supply power to it.
It is advisable to ground the amplifier. Therefore,
if a three-wire outlet is not available, an adapter such
Leviton
as
ard two-wire outlet for use with three-wire plugs. The
adapter is provided with a grounding pigtail which
should be connected to the screw holding the wall plate
to the receptacle, as shown in figure 1.
In some areas, the
grounded. In this case it will be necessary to
connect a grounding wire between the GND ter
minal
water or steam pipe.
No. 5017 should be used to convert a stand-
on the rear chassis of the amplifier and a
CHSlOO
GROUNDlNG
NOTE
amplifier (with or with-
will
ground
wall plate
screw is not
x
7”
INPUT CONNECTIONS
MICROPHONES
Two microphones may be connected to the amplifier, and either or both may be used simultaneously.
Either high or low-impedance microphones may be
used. The amplifier is shipped with an adaptor in the
microphone receptacles, which permits high-impedance
microphone inputseither from a phone plug or from
a standard
MClF
Figure 1
microphone connector.
-
Grounding Line Cord Adapter
Z:
Connect a high-impedance microphone (10,000
HI
ohms or more) to the MIC 1 HI
Z
receptacle on the
rear panel of the amplifiet (see figure 2). Connect a
second high-impedance microphone to the receptacle
marked MIC 2 HI
Z.
Use a single-conductor shielded
cable, terminating either in a phone plug or a standard
microphone connector (Amphenol 75-MClF or equiv-
alent). Remove the adaptor from the microphone receptacle when the phone plug is used. The cable
length from the microphone to the amplifier should be
kept under 10 feet.
LO Z: Connect low-impedance microphones (600 ohms
or less) to the LO Z terminal strip on the rear panel
(see figure 2). Use a single-conductor shielded cable.
The conductor is connected to the MIC 1 terminal and
the shield to GND. Connect a second low-impedance
microphone to the terminal strip in the same manner,
with the high side of the cable to the MIC 2 terminal
-3-
Loading...