Amron 8895-AMP-8 Manuel utilisateur

8895-UM REV 1.0

User Manual

for

Amron International, Inc.

Model 8895-AMP-8

Model 8895-AMP-16

S/N______________________

1380 Aspen Way, Vista California 92081-8349

United States of America

Phone: (760) 208-6500

Fax (760) 599-3857

email: sales@amronintl.com

web: www.amronintl.com

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, Inc. reserves the right to change

MODEL 8895 USER MANUAL

8895-UM REV 1.0

TABLE OF CONTENTS

1. INTRODUCTION AND SPECIFICATIONS ........................................................................................................... 3

INTRODUCTION..............................................................................................................................................31.1

ELECTRICAL SPECIFICATIONS .........................................................................................................................31.2

POWER...........................................................................................................................................................31.3

MECHANICAL .................................................................................................................................................41.4

2. WARRANTY AND SERVICE POLICY .................................................................................................................. 5

LIMITED WARRANTY ......................................................................................................................................52.1

SERVICE POLICY..............................................................................................................................................52.2

3. ACCESSORIES.................................................................................................................................................. 6

8895-005........................................................................................................................................................6

3.1

8895-100........................................................................................................................................................63.2

8895-600........................................................................................................................................................63.3

8895-700........................................................................................................................................................63.4

8895-800........................................................................................................................................................63.5

4. CONTROLS AND CONNECTIONS...................................................................................................................... 7

FRONT PANEL CONTROLS...............................................................................................................................74.1

REAR PANEL CONNECTIONS...........................................................................................................................74.2

5. INSTALLATION AND OPERATION .................................................................................................................... 7

INSTALLATION................................................................................................................................................75.1

OPERATION ....................................................................................................................................................85.2

THEORY OF OPERATION .................................................................................................................................85.3

FUNCTIONAL BLOCK DIAGRAM....................................................................................................................105.4

6. MAINTENANCE............................................................................................................................................. 11

7. DRAWINGS................................................................................................................................................... 12

SCHEMATIC, MODEL 8895-AMP-8 ...............................................................................................................137.1

SCHEMATIC, MODEL 8895-AMP-16 .............................................................................................................147.2

SCHEMATIC, AUDIO 1&28895-200 PC CARD..............................................................................................157.3

SCHEMATIC, AUDIO 3&48895-200 PC CARD..............................................................................................167.4

SCHEMATIC, AUDIO 5&68895-200 PC CARD..............................................................................................177.5

SCHEMATIC, AUDIO 7&88895-200 PC CARD..............................................................................................187.6

SCHEMATIC, INPUT AUDIO &POWER 8895-200 PC CARD............................................................................197.7

SYSTEM INTERCONNECT DIAGRAM MODEL 8895........................................................................................207.8

CABLE ASSEMBLY MODEL 8895-600 ............................................................................................................217.9

OUTSIDE JUNCTION BOX DIAGRAM MODEL 8895-700 ................................................................................227.10

INSIDE JUNCTION BOX DIAGRAM MODEL 8895-800....................................................................................237.11

PARTS IDENTIFIER MODEL 8895-AMP-8 &-16, FRONT ................................................................................247.12

PARTS IDENTIFIER MODEL 8895-AMP-8, BACK ............................................................................................257.13

PARTS IDENTIFIER MODEL 8895-AMP-16, BACK ..........................................................................................267.14

OUTSIDE JUNCTION BOX MODEL 8895-700 .................................................................................................277.15

MODEL 8895 USER MANUAL

8895-UM REV 1.0

PARTS IDENTIFIER MODEL 8895-700............................................................................................................28

7.16

INSIDE JUNCTION BOX MODEL 8895-800.....................................................................................................297.17

PARTS IDENTIFIER MODEL 8895-800............................................................................................................307.18

8. PARTS LIST GENERAL .................................................................................................................................... 31

MODEL 8895-AMP-8, TOP ASSEMBLY ..........................................................................................................328.1

MODEL 8895-AMP-16, TOP ASSEMBLY ........................................................................................................328.2

MODEL 8895-005, PNEUMATIC HEADSET FOR O2 HOOD ............................................................................338.3

MODEL 8895-100, PATIENT ENTERTAINMENT SET ......................................................................................338.4

MODEL 8895-600, CABLE ASSEMBLY, 20 FOOT LENGTH ..............................................................................338.5

MODEL 8895-700, JUNCTION BOX (OUTSIDE)..............................................................................................348.6

MODEL 8895-800, JUNCTION BOX (INSIDE) .................................................................................................358.7

MODEL 8895-8-500, CHASSIS &REAR PANEL ASSEMBLY .............................................................................358.8

MODEL 8895-16-500, CHASSIS &REAR PANEL ASSEMBLY ...........................................................................378.9

MODEL 8895-200A, PC CARD ASSEMBLY .....................................................................................................388.10

MODEL 8895 USER MANUAL

8895-UM REV 1.0

1. INTRODUCTION AND SPECIFICATIONS

INTRODUCTION1.1

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 to provide audio entertainment. 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.

ELECTRICAL SPECIFICATIONS1.2

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

POWER1.3

A.C. Power..................................................................................... 115/220 Volts AC 50/60 Hz

Isolation Transformer ..................................................................... Split Bobbin Medical Grade

MODEL 8895 USER MANUAL

8895-UM REV 1.0

MECHANICAL

1.4

Enclosure ....................................................................................... Black Anodized Aluminum

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)

MODEL 8895 USER MANUAL

8895-UM REV 1.0

2. WARRANTY AND SERVICE POLICY

LIMITED WARRANTY2.1

Amron warrants that its manufactured products are free from defects in material and

workmanship under normal use and service, as described in all literature covering the

products for a period of 90 days from date of shipment. Amron’s obligations under this

warranty are limited to the repair of, or replacement of materials at Amron’s discretion. This

warranty shall not cover defects which are the result of misuse, negligence, accident, repair,

or alterations.

SERVICE POLICY2.2

For technical assistance or to request a repair please call (760) 208-6500 Monday-Friday,

6am-5pm PST. Please do not return any product without an authorization number. After

obtaining a return authorization number, wrap and pack the item securely and ship to the

following address. We suggest that you use a carrier that provides tracking information and

insure the item for full replacement value.

Amron International, Inc.

Attn: Repairs Department

1380 Aspen Way

Vista, CA 92081

Be sure to reference the return authorization number on the shipment. For non-warrantable

repairs, a minimum evaluation fee will be charged. A written evaluation and quote will be

provided for approval before Amron proceeds with the repairs.

MODEL 8895 USER MANUAL

8895-UM REV 1.0

3. ACCESSORIES

8895-0053.1

Pneumatic Headset has dual ear muffs with male Q.D.

8895-1003.2

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.)

8895-6003.3

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.

8895-7003.4

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.

8895-8003.5

Inside Junction Box has male adapter bushing 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.

MODEL 8895 USER MANUAL

8895-UM REV 1.0

4. CONTROLS AND CONNECTIONS

Before using the Entertainment System, you should familiarize yourself with the controls and

connections. Improper use of the controls and connections may deprive the user of the full benefits

of the system.

FRONT PANEL CONTROLS4.1

4.1.1 Power Switch –Turns AC Power on/off.

4.1.2 Power Indicator –Confirms power is on or off

4.1.3 Source Input Volume Level Controls –Used to balance the volume levels from

different sources, one of each of the four inputs

4.1.4 MV –Master Volume control

REAR PANEL CONNECTIONS4.2

4.2.1 AC Power Cord –Connect to AC power source

4.2.2 Entertainment output (1 thru 8) –MS Cable attachment point for studio to patient

entertainment modules.

4.2.3 Source A Input (L&R) - RCA audio jack for connection to audio source i.e., AM/FM

tuner, recording device, CD, DVD, or MP3 player, or TV audio out. Stereo input for

left and right channels.

4.2.4 Source B Input (L&R) - RCA audio jack for connection to audio source i.e., AM/FM

tuner, recording device, CD, DVD, or MP3 player, or TV audio out. Stereo input for

left and right channels.

4.2.5 Source C Input (L&R) - RCA audio jack for connection to audio source i.e., AM/FM

tuner, recording device, CD, DVD, or MP3 player, or TV audio out. Stereo input for

left and right channels.

4.2.6 Source D Input (L&R) - RCA audio jack for connection to audio source i.e., AM/FM

tuner, recording device, CD, DVD, or MP3 player, or TV audio out. Stereo input for

left and right channels.

4.2.7 Entertainment Output (9 thru 16, Model 8895-AMP-16 only) - MS cable attachment

point for audio to patient entertainment modules.

5. INSTALLATION AND OPERATION

INSTALLATION5.1

If you have purchased a complete system, begin by installing all components. The patient

entertainment module should be installed in a convenient location for the patient to reach

while seated in a normal position. Patient will need to be able to reach the yellow push

button switch in order to change channels.

MODEL 8895 USER MANUAL

8895-UM REV 1.0

The outer junction box should be installed before the inner junction box. This makes it easier

to feed the wires through the chamber penetrator. After both junction boxes are installed,

connect the electrical feed-thru wires in the inside junction box. Next you will want to run the

patient entertainment module cables to the inside junction box, routing the cable through one

of the appropriate strain reliefs. Connect the wires from the patient entertainment module as

shown on the System Interconnect Diagram, DWG NO. 8895-SYS-D101. There are four

wires from each module, two are clear and two are blue in color. Use an ohmmeter to

identify the clear wire with the switch in the line and connect as shown. Next identify the

blue wire on the side opposite the speaker from the switch and connect as shown. Connect

the remaining wires, clear and blue as shown.

Route and install the cable between the amplifier and the outer junction box. Connect the

amplifier to the audio source components and check out the system confirming the presence

of audio and proper operation of the channel selector.

OPERATION5.2

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.

THEORY OF OPERATION5.3

The 8895-AMP-8 & 8895-AMP-16 are built in two configurations, an 8-patient and a 16-

patient version. There are eight output audio amplifiers in the -8 and sixteen in the -16, each

driving one patient entertainment module. Each of the amplifier’s inputs can be remotely

controlled to select one of four input sources of audio. The remote source selection is done

by a push button on the patient entertainment module.

MODEL 8895 USER MANUAL

8895-UM REV 1.0

The entertainment module contains an audio transducer which produces an audio sound

pressure wave to drive a pneumatic headset. The entertainment module has a diaphragm to

separate the transducer from the sound tube. This prevents the possibility of the back flow of

oxygen into the transducer when the headset is being used in an oxygen enriched area such

as an oxygen treatment hood.

The amplifier unit has four stereo inputs, each having a left and right audio input. This allows

the system to be connected to a stereo source. The stereo information is mixed using a

center taped transformer. The transformer also provides isolation from the source

equipment. The output of the transformer is fed to a potentiometer to control the signal level.

The output of the volume control is fed to an operational amplifier to buffer the signal. There

are four separate circuits, one for each of the four input sources of audio. This input section

has two output jacks, J6 & J8, which feeds the audio output section of the amplifier card.

The audio output amplifier is fed by one of the four input audio sources. The patient controls

the source by activating the channel selector button. The contact closure is de-bounced and

steps a ring counter. The ring counter output is buffered and decoded from binary by a

series of “AND” gates. The output of the “AND” gates drives a four pole analog switch which

routes one of the four input audio sources of the input of the final audio output amplifier. The

selection of audio sources is “A”, “B”, “C” and “D”; and then repeats beginning with “A”.

The audio amplifier IC is a stereo unit. Each side is used for separate channels. Each unit

has a separate volume control which is voltage controlled. All amplifiers are controlled from a

common volume control. The output of each amplifier’s current is limited by resistors and

capacity; and is coupled to eliminate any D.C. voltage which might appear on the output.

All of these circuits are powered from a common power supply. The supply uses fuses

mounted on the P.C. card. Fuses are ½ amps and each side of the line is fused. The AC

power switch interrupts the AC line before the power transformer. The power transformer is

a medical grade transformer providing excellent isolation from the line and low leakage

current. A full wave rectifier, filter capacitors (C23, C35 & C34), and two 3-terminal fixed

voltage regulators are used. The first regulator is 15 Volts and the second is 5 Volts.

On the 8895-AMP-16 a second amplifier card is used. The second card uses the same

power transformer as the first card. Also the input audio section of the first card is bused to

the second card. The input volume controls on the second card are not used, and left off the

card along with the AC power switch. All other circuits of the second remain functional and

operate in the same manner as the first card.

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