Amron 8895-AMP-8 User manual

User Manual
for
Amron International Diving Supply, Inc.
Model 8895-AMP-8
Model 8895-AMP-16
Entertainment Amplifier
S/N__________________
This manual and the information contained herein are 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 [phone] Fax [phone]
Email: [email protected]
Web : www.amronintl.com
Copyright @ 1998, Amron International, Inc.
Revised October 2010

TABLE OF CONTENTS
SECTION
Specifications 1
Electrical .......................................................................................................................1.1
Power............................................................................................................................1.2
Mechanical....................................................................................................................1.3
Size...............................................................................................................................1.4
General Information 2
General Information ......................................................................................................2.1
Figure 1 Picture 8895-AMP-8........................................................................................2.2
Figure 2 Picture 8895-AMP-8 (rear)..............................................................................2.3
Options and Accessories 3
Accessories...................................................................................................................3.1
Warranty and Service Policy 4
Limited Warranty...........................................................................................................4.1
Service Policy................................................................................................................4.2
Controls and Connections 5
Controls and Connections ............................................................................................5.1
Installation and Operation 6
Operation ......................................................................................................................6.1
Installation.....................................................................................................................6.2
Theory of Operation 7
Theory of Operation......................................................................................................7.1
Functional Block Diagram.............................................................................................7.2
I

TABLE OF CONTENTS
II
Maintenance 8
Periodic Tests and Checks ...........................................................................................8.1
Drawings and Schematics 9
General .........................................................................................................................9.1
Schematic, Model 8895-AMP-8 ....................................................................................9.2
Schematic, Model 8895-AMP-16 ..................................................................................9.3
Schematic, Audio 1 & 2 8895-200 PC Card..................................................................9.4
Schematic, Audio 3 & 4 8895-200 PC Card..................................................................9.5
Schematic, Audio 5 & 6 8895-200 PC Card..................................................................9.6
Schematic, Audio 7 & 8 8895-200 PC Card..................................................................9.7
Schematic, Input Audio & Power 8895-200 PC Card....................................................9.8
System Interconnect Diagram Model 8895...................................................................9.9
Cable Assembly Model 8895-600...............................................................................9.10
Outside Junction Box Diagram Model 8895-700.........................................................9.11
Inside Junction Box Diagram Model 8895-800 ...........................................................9.12
Parts Identifier, Models 8895-AMP-8 & -16, Front......................................................9.13
Parts Identifier, Model 8895-AMP-8, Back..................................................................9.14
Parts Identifier, Model 8895-AMP-16, Back................................................................9.15
Outside Junction Box Model 8895-700.......................................................................9.16
Parts Identifier, Model 8895-700.................................................................................9.17
Inside Junction Box Model 8895-800..........................................................................9.18
Parts Identifier, Model 8895-800.................................................................................9.19
Parts List 10
General .......................................................................................................................10.1
Model 8895-AMP-8, Top Assembly ............................................................................10.2
Model 8895-AMP-16, Top Assembly ..........................................................................10.3
Model 8895-005, Pneumatic Headset for O2 Hood....................................................10.4
Model 8895-100, Patient Entertainment Set...............................................................10.5
Model 8895-600, Cable Assembly, 20 Foot Length....................................................10.6
Model 8895-700, Junction Box, Outside.....................................................................10.7
Model 8895-800, Junction Box, Inside........................................................................10.8
Model 8895-8-500, Chassis & Rear Panel Assembly.................................................10.9
Model 8895-16-500, Chassis & Rear Panel Assembly.............................................10.10
Model 8895-200A, PC Card Assembly .....................................................................10.11

SPECIFICATIONS
ELECTRICAL 1.1
Input Channels.....................................................................................................4 Stereo
Input Impedance (Each Input)...........................................................................600 Ohms
Frequency Response.............................................................................100 hz To 30 khz
Sensitivity (Input).......................................................................................................1 mV
Output Channels..............................................................................................................8
Output Power per Channel (RMS @ 8 Ohm Load).............................................. ¼ Watts
Output Impedance............................................................................... Less Than 8 Ohms
POWER 1.2
A. C. Power............................................................................ 115/220 Volts AC 50/60 Hz
Isolation Transformer.............................................................Split Bobbin Medical Grade
MECHANICAL 1.3
Enclosure ............................................................................... Black Anodized Aluminum
SIZE 1.4
Length...................................................................................................13.0 IN. (33.0 cm)
Width.....................................................................................................17.0 IN. (43.2 cm)
Height........................................................................................................3.5 IN. (8.9 cm)
Weight.....................................................................................................7.3 LBS. (3.3 kg)
1

GENERAL INFORMATION
GENERAL INFORMATION 2.1
The Model 8895-AMP-8 & 8895-AMP-16 Entertainment Amplifiers are four-channel audio
amplifiers designed to provide entertainment audio to patients within a hyperbaric chamber
environment. The amplifier is one part of a complete system to provide entertainment audio.
Amron has all the components available to build a complete system, including cables.
Patients wear a pneumatic headset (the same type as used by the airline industry) to provide
audio entertainment for passengers. This configuration was selected so that the patients could
use the headset while receiving oxygen treatment and still safely have audio entertainment. No
electrical energy is present at the headset. Volume level is adjustable by each patient, and each
patient has channel selection control. Up to four audio selections can be provided.
The patient headset is driven by a patient entertainment module which converts the electrical
signal to a sound pressure wave to drive the pneumatic headset. The audio transducer is isolated
from the pneumatic headset via a diaphragm. The electrical signal to the patient entertainment
module is a low voltage/low wattage signal, typically one watt with a maximum voltage of 12 VDC.
A volume control is provided as part of the headset tubing, allowing each patient to adjust their
listening level.
Each patient entertainment module has channel selection capabilities. A push-button switch
allows the patient to step through up to four different selections of audio. Again, in keeping with
the safety issues of a chamber environment, the electrical switching is done with low voltage
current, limited logic level signals. Up to eight patient entertainment modules can be driven by the
8895-AMP-8 and sixteen can be driven by the 8895-AMP-16.
A 110/220 volt selector switch is located on the rear of both the Model 8895-AMP-8 & 8895-AMP-
16. Select the desired voltage by turning the sector switch with a small slotted screwdriver.
2

GENERAL INFORMATION
PICTURE OF THE MODEL 8895-AMP-8 2.2
3

GENERAL INFORMATION
PICTURE OF THE MODEL 8895-AMP-8 (rear) 2.3
4

OPTIONS
ACCESSORIES 3.1
Model 8895-005
Pneumatic Headset has dual ear muffs with male Q.D.
Model 8895-100
Patient Entertainment Set contains audio sound transducer and channel selector switch.
Comes complete with 20 foot electrical hookup cable, 5 ½ foot sound tubing (includes
volume control and female Q. D.)
Model 8895-600
Cable Assembly connects amplifier 8895-AMP-8 to outside junction box on chamber.
Handles audio and channel selection signals for up to 8 patient entertainment modules.
Two cable assemblies required for the 8895-AMP-16 amplifier unit. Cable Assembly is 20
feet long, other lengths available on special order.
Model 8895-700
Outside Junction Box has connector to mate with 8895-600 cable assembly and an
electrical penetrator (20 conductor, ¾” Male NPT) to mount to chamber. Unit is pre-
assembled and tested, ready to screw into the chamber penetrator.
Model 8895-800
Inside Junction Box has male adapter busing to mount to chamber penetrator (3/4” Male
NPT) and terminal boards to attach electrical feed-thru wires from 8895-700. Two cable
grommets protect the cables from the patient entertainment modules as they enter the
junction box. Entertainment modules are wired to the terminal boards to complete the
installation.
5

WARRANTY AND SERVICE POLICY
LIMITED 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 obligation under this warranty is limited to the repair or
replacement of defective material at AMRON'S option. This warranty shall not cover defects which
are the result of misuse, negligence, accident, repair or alterations.
SERVICE POLICY 4.2
AMRON INTERNATIONAL encourages owners of equipment to call [phone] for
assistance if problems are encountered. Every effort will be made to assist in solving your
problem. Equipment which must be returned to the factory for repairs 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
Your Company Name
Shipping Address
Phone Number
Contact Name
A short description of the problem is most helpful.
Valid in warranty repairs will be made at no charge. Out of warranty repairs will be handled in the
same fashion, except you will be advised of the repair charges before any work is done.
6

INSTALLATION & OPERATION
OPERATION 6.1
Turn power on and confirm power is on by observing the power on indicator. Make sure all
sources of audio are on and operating properly.
On initial set up, set all volume controls on the source devices to minimum and all front panel
volume controls to mid scale. Use one of the headsets within the chamber, making sure the
volume control valve on the sound tubing is full “ON”. Slowly advance source “A” while listening to
the headset within the chamber. Cycle the source selector switch to locate the presence of audio
and confirm the operation of the system.
Set the volume level for source “A” for a comfortable level on the headset in the chamber. Repeat
this procedure for source “B”, being sure to first advance the channel selector one step. After
setting channel “B”, repeat this procedure for channels “C” & “D”. If you are not going to have four
sources of audio material, you can leave a channel open (nothing connected) or you can put the
same material on multiple channels using a “Y” cable available from any retailer selling audio
equipment (female jack to two male jacks).
Once the volume levels are set for the four channels, note the position of the volume controls on
the source equipment.
The volume controls on the front panel adjust the range of audio levels which the amplifier will
accommodate. If you have a source of material which has a low output you can increase the
sensitivity of that channel without affecting the other channels.
The master volume (MV) controls the output of the amplifier and adjusts the volume level to all
patient entertainment modules.
Once a proper level is achieved no further adjustment should be necessary.
8