Amron 2810A-2001 User manual
INSTRUCTION MANUAL
FOR
AMRON INTERNATIONAL DIVING SUPPLY, INC.
MODEL 2810A-2001
Single Lock Chamber Communicator
S/N _____________________
This manual and the information contained herein is provided for use as an operation and
maintenance guide. No license or rights to manufacture, reproduce, or sell either the manual or
articles described herein are given. AMRON INTERNATIONAL DIVING SUPPLY, Inc. reserves
the right to change specifications without notice.
Amron International Diving Supply, Inc.
1380 Aspen Way
Vista, California 92081 U.S.A
PHONE (760) 208-6500
FAX (760) 599-3857
Email: [email protected]
www.amronintl.com
Copyright © 2005, AMRON INTERNATIONAL, INC.
Revised August 2010
TABLE OF CONTENTS
Specifications 1
Electrical........................................................................................................................1.1
Mechanical....................................................................................................................1.2
General Information 2
Options & Accessories 3
Warranty and Service Policy 4
Limited Warranty...........................................................................................................4.1
Service Policy................................................................................................................4.2
Controls and Connections 5
Operation 6
Theory Of Operation 7
Theory Of Operation .....................................................................................................7.1
Amplifier Card 2811B-200.............................................................................................7.2
Audio Output Volume Controls......................................................................................7.3
Battery Charger Card, 2324-202...................................................................................7.4
Maintenance & Trouble Shooting 8
Chamber Radio Field Check Procedures .....................................................................8.1
Quick Simulcom Check ................................................................................................8.2
Comprehensive 2-Wire and Simulcom Check .............................................................8.3
Problems And Their Possible Causes...........................................................................8.4
Drawings & Schematics 9
General .........................................................................................................................9.1
Parts Layout 2811B-200 ...............................................................................................9.2
Parts Layout 2324-202..................................................................................................9.3
Front Panel 2810A-2001...............................................................................................9.4
Schematic 2810A-2001.................................................................................................9.5
Parts Identifier- Front Panel Model 2810A-2001...........................................................9.6
Mounting Detail Model 2810A-2001..............................................................................9.7
I
TABLE OF CONTENTS
II
Parts List 10
General Information ....................................................................................................10.1
2810A-2001 Chamber Communicator ........................................................................10.2
2811B-200 PC Card Assembly...................................................................................10.3
2323-6002 Charger Chassis Assembly.......................................................................10.4
2824-202 Power Supply PC Card Assembly ..............................................................10.5
2810A-FS Field Spares Kit..........................................................................................10.6
2810A-SS Shop Spares Kit.........................................................................................10.7
SPECIFICATIONS
1
ELECTRICAL 1.1
Input Impedance (Each Input)...........................................................................100 Ohms
Frequency Response..................................................................................650 - 2200 Hz
Common Mode Rejection.........................................................................................40 dB
Current Drain Maximum Full Volume.................................................................... 3 Amps
Typical Quiescent........................................................................................... 110 mAmps
Minimum Load Impedance.......................................................................................1 ohm
External Power Supply Voltage.....................................................115/230 VAC 50/60 Hz
Internal Power Supply Voltage..................................................................12 VDC Nominal
Operational Supply Voltage ...................................9 Volts Minimum - 18 Volts Maximum
Sensitivity (Input).......................................................................................................1 mV
Output Power (RMS @ 4 OHM Load, 14 VDC).................................................... 20 Watts
Battery Life, Model 2810A-2001..........................................................................50 Hours
DC Circuit Operating Voltage................................................................................12 VDC
MECHANICAL 1.2
Panel..........................................................................................................Stainless Steel
Enclosure ............................................................................... Black Anodized Aluminum
Width.....................................................................................................10.75 in. (27.3cm)
Chassis Clearance Depth .......................................................................7.00 in. (17.7cm)
Height......................................................................................................6.75 in. (17.2cm)
Weight With Batteries
Model 2810A-2001..................................................................................11.5 Lbs. (5.1kg)
GENERAL INFORMATION
2
GENERAL INFORMATION 2.1
The Amron International AMCOM Model 2810A-2001 is a panel mounted chamber communication
system operating from an internal 115/230 VAC power source with an internal 12 VDC battery
back up. The system is designed to provide voice communications between the chamber operator
and occupants within the chamber.
The 2810A-2001 has the capability of 2-wire and/or “Simulcom” (4-wire) communication modes.
Two-wire and Simulcom (4-wire) modes can be used simultaneously. This enables the user to
operate in a hands free mode, using a headset and communicate between the chamber and
operator without having to use the push-to-talk.
The AMCOM I Chamber Communication System is a full-featured hard wire, single lock
communication system. The AMCOM I has independent volume controls (operator and lock). The
2810A-2001 can be used with a hand held microphone, which incorporates automatic talk back
speaker cut out. This feature greatly reduces the amount of background noise, and under noisy
conditions can make the difference between good or unacceptable sound and speech clarity.
OPTIONS & ACCESSORIES
OPTIONS & ACCESSORIES 3.1
1. Model 2821-28 AMRON remote walk-and-talk for deluxe headset with push-to-talk belt
module, banana jacks 25 feet 1/4" OD cable. - allows operator to use the push-to-talk
function from a belt module while connected to a 25’ extension on the headset. This is a
2-wire configuration. Custom lengths are available.
2. Model 2822-28 Amron Headset Extension (Simulcom - 4-wire) belt module with 25 feet of
1/4" O.D. cable - allows operator to talk freely on Simulcom while connected to a 25’
extension on the headset. Custom lengths are available.
3. Model 2460-28 headset with boom microphone, dual banana plugs. For operator.
4. Model 2460-31R headset with boom microphone, single XLR connector. For occupant.
5. Model 3113 Chamber Speaker. Includes talkback speaker, XLR headset jack and MS
mating connector.
6. Model 2405-28 Hand Held Push-To-Talk “noise canceling” microphone.
3
WARRANTY
WARRANTY 4.1
AMRON INTERNATIONAL DIVING SUPPLY, INC. warrants that its products are free from defects
in material and workmanship under normal use and service, as described in AMRON
INTERNATIONAL DIVING SUPPLY, Inc. literature covering this product, for a period of 90 days
from date of shipment. Amron’s obligations under this warranty are limited to the repair of or
replacement, at AMRON’S option, of defective materials. This warranty shall not cover defects,
which are the result of misuse, negligence, accident, repair or alterations.
SERVICE POLICY 4.2
Every effort will be made to assist in solving your problem. Equipment which must be returned to
the factory for repairs and should be safely packaged, insured, and shipped prepaid to:
AMRON INTERNATIONAL, INC.
1380 ASPEN WAY
VISTA, CA. 92081
Be sure to include the following information:
YOUR NAME (COMPANY NAME)
SHIPPING ADDRESS
PHONE NUMBER
CONTACT NAME
Please provide a brief description of the problem.
Valid in-warranty repairs will be made at no charge. A written estimate of repair charges will be
provided for out-of-warranty repairs before any work is done.
4
CONTROLS & CONNECTIONS
CONTROLS & CONNECTIONS 5.1
Before using the AMCOM I series diver communications system, you should familiarize yourself
with its operating controls and connections. Improper use of controls and connections will deprive
the user of the full benefit of this communication system.
A. Operator Controls
POWER Switch - Applies power to the unit.
SPEAKER Switch - Turns Speaker On/off. It may be necessary to turn speaker off when using a
headset to prevent feedback.
PUSH TO TALK Switch - Allows operator to chamber communication in 2-wire mode.
VOLUME OPERATOR - Controls amplification of operator’s microphone, therefore operator’s
volume to chamber
VOLUME CHAMBER - Controls amplification of chamber’s microphone, therefore chamber’s
volume to operator
B. Operator Connections
HEADSET - (INPUT/OUTPUT) - Is a dual banana jack (color coded black) connection for headset
earphones or external remote speaker. In 2-wire operation both headset microphone and
earphones are plugged into this jack, conversations (up-link & down-link) are switched
automatically when push to talk switch is actuated. In Simulcom (4-wire) operation this jack is
listening only, both up-link and down-link conversations are heard.
PUSH TO TALK - (INPUT) - Is a dual banana jack (color coded yellow), connection for remote
keying of push to talk. Single contact closure, 2-wire, close for down-link, open for up-link.
MICROPHONE - (INPUT) - Is a dual banana jack (color coded red) connection for
headset/microphone.
BATTERY CONDITION - INDICATOR, on steady indicates the presence of power, and a charged
battery. When the battery condition indicator blinks, the battery is low, and will need charging
soon. At the time when the indicator first begins to blink there are approximately 3 hours of
operating time remaining. When the indicator does not come on, battery voltage is below the point
at which reliable operation can be guaranteed. The first function to fail because of low voltage will
be the down link communication in 2-wire operation. Operator can hear chamber but chamber can
not hear operator.
HAND HELD MICROPHONE (Optional) with push-to-talk function. Actuation of hand held
microphone automatically disconnects the talk back speaker cutting out all background noise.
TAPE RECORDER Output signal for diving external recorder. Output level is factory set for 100
millivolt p-p.
5
OPERATION
OPERATION 6.1
The AMCOM I Model 2810A-2001 has the capability of 2-wire and/or Simulcom (4-wire) operation.
A. 2-Wire Operation
Connect the cable from the 2810A-2001, Red dual banana jack on the rear panel of the
communicator to the Chamber Comm. Box Model 3111 or equivalent. Chamber communicator will
monitor the chamber. The operator will hear all sounds in the vicinity of the Model 3111. Operator
must press the push-to-talk switch to talk to the chamber. This can be done by pushing the switch
and speaking into the speaker.
A better and more comfortable method is to use the optional hand held push-to-talk microphone.
You may also use a headset with either of the push-to-talk switches. If you are using the AMRON
Remote Walk & Talk Model 2821-28, the operator may press the push-to-talk switch on the belt
module.
B. Volume Controls
Chamber Volume Control - Adjusts the gain of the amplifier for the chamber microphone, thereby
adjusting volume the operator hears.
Operator Volume Control - Adjusts the gain of the amplifier for the operator's microphone, thereby
adjusting the volume to the chamber.
C. Simulcom (4-wire) Operation
Connect the cable from the 2810A-2001, red and black dual banana jacks on the rear panel of the
communicator to the Chamber Comm. Box Model 3111 or equivalent. Connect a headset (2460-
31R) to the Model 3111.
Connect operator headset (2460-28) earphones to “Headset” (input) and headset microphone to
"Microphone” (input). Turn speaker off to avoid acoustic feedback. Operation with speaker is
possible; by extending operator’s headset away from the speaker using the Headset Extension
Cable (25 foot). Note: It is not necessary to use the “Push-To-Talk” switch when operating in the
Simulcom Mode.
Operating the PTT switch will establish a priority channel for communication. “PTT” cuts out the
chamber’s microphone and prevents the chamber from talking. This allows the ability to establish a
clear channel of communications.
6
THEORY OF OPERATION
THEORY OF OPERATION 7.1
Refer to the diagrams and schematics while reading this section. This Section describes the
function of the electronic circuits.
AMPLIFIER CARD 2811B-200 7.2
Signal input
U2A and U2B are differential input amplifiers that accept dynamic microphone level signals (1 to
10mv.) and amplify them. Signals common to both inputs are rejected, common mode rejection,
(CMR).
Filter
U2C is an active passband filter and mixer that filters the speech waveforms for amplification and
clarity and sums the operator and chamber signals together.
Audio Power Amplifiers
The audio power amplifier, U2, is connected in a single ended configuration. The output "floats" at
approximately 6 volts and should never be connected to ground. The amplified audio output signal
is directed to the Chamber & Operator through relays K2 and K3.
Bias Level
Resistor R21 and voltage reference D2 determine the bias voltage for the amplifiers U1 and U2. It
should be 5.1 volts measured to ground +/- 5%.
Push to Talk and the Speaker Disconnect Relay
K1 is activated when a short circuit is applied to the yellow push to talk jacks on the front edge of
the case. This activates the push to talk circuitry, but also disconnects the speaker. The result is
superb clarity when using a hand held microphone to talk and the speaker to listen. When the
push to talk button on the front panel is used the speaker remains connected and may be used as
a microphone.
Battery Voltage Senses Circuit – U1 is used to electronically sense the battery voltage.
Controls the panel LED (battery condition indicator) that indicates operational status:
Good battery voltage ......................steady green light
Low battery ......................blinking green light
Below reliable operational range ......................off
7
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