Amron 2820A Operation & User’s Manual

Model 2820A-XX & 2825A-XX Series Portable Two Diver Communicators S/N ____________________ 1380 Aspen Way, Vista California 92081-8349 United States of America Phone: (760) 208-6500 Fax (760) 599-3857 Email: [email protected] 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 specifications without notice. Copyright© 2020 Amron International, Inc.

282XA-UM REV 5.0 i TABLE OF CONTENTS 1 INTRODUCTION AND SPECIFICATIONS .......................................................................................... 1 1.1 INTRODUCTION ........................................................................................................................... 1 1.2 SPECIFICATIONS ........................................................................................................................ 1 1.3 BATTERY LIFE ............................................................................................................................. 2 1.4 MATERIALS, WEIGHTS & DIMENSIONS .................................................................................... 2 2 OPTIONS AND ACCESSORIES .......................................................................................................... 3 2.1 OPTIONS ...................................................................................................................................... 3 2.2 ACCESSORIES ............................................................................................................................ 3 3 CONTROLS AND CONNECTIONS...................................................................................................... 5 3.1 TENDER CONTROLS & CONNECTIONS ................................................................................... 5 3.2 DIVER CONTROLS & CONNECTIONS ....................................................................................... 8 3.3 HELIUM SPEECH UNSCRAMBLER (DSP3) CONTROLS .......................................................... 9 3.4 WIRELESS TENDER (28B) CONTROLS ................................................................................... 10 3.5 DRAWING, 2-WIRE CONNECTIONS......................................................................................... 11 3.6 DRAWING, FULL DUPLEX (4-WIRE) CONNECTIONS ............................................................. 12 3.7 DRAWING, OPERATOR CONNECTIONS, HAND HELD MICROPHONE ................................ 13 3.8 DRAWING, OPERATOR CONNECTIONS, HEADSET .............................................................. 14 4 OPERATION ....................................................................................................................................... 15 4.1 BATTERY CHARGING ............................................................................................................... 15 4.2 BATTERY CONDITION .............................................................................................................. 16 4.3 BATTERY INSTALLATION ......................................................................................................... 16 4.4 MODES OF OPERATION ........................................................................................................... 16 4.5 VOLUME CONTROLS (2-WIRE) ................................................................................................ 18 4.6 VOLUME CONTROLS FULL DUPLEX (4-WIRE) ....................................................................... 18 4.7 HELIUM SPEECH UNSCRAMBLER OPTION ........................................................................... 19 5 MAINTENANCE AND TROUBLESHOOTING ................................................................................... 23 5.1 FULL DUPLEX (4-WIRE) CHECK .............................................................................................. 23 5.2 2-WIRE CHECK .......................................................................................................................... 23 5.3 GENERAL MAINTENANCE ........................................................................................................ 24 5.4 RECOMMENDED MAINTENANCE SCHEDULE ....................................................................... 24 5.5 TROUBLESHOOTING ................................................................................................................ 26 6 DRAWINGS ........................................................................................................................................ 29 6.1 PARTS IDENTIFIER, MODEL 2820A-11 WEATHER RESISTANT AC POWER MODULE ...... 30 6.2 PARTS IDENTIFIER, MODEL 2825A-11 WEATHER RESISTANT AC POWER MODULE ...... 31 6.3 PARTS IDENTIFIER, MODEL 2825A-12 WEATHER RESISTANT AC POWER MODULE & DSP3 HELIUM SPEECH UNSCRAMBLER ............................................................................... 32 6.4 PARTS IDENTIFIER, MODEL 2825A-13 WEATHER RESISTANT AC POWER MODULE & 28B WIRELESS TENDER.................................................................................................................. 33

282XA-UM REV 5.0 ii 7 PARTS LISTS ..................................................................................................................................... 34 7.1 PARTS LIST FOR 282XA-XX SERIES FRONT PANEL ASSEMBLIES..................................... 34 7.2 PARTS LIST, MODEL 2820A-11, WEATHER RESISTANT AC POWER MODULE ................. 35 7.3 PARTS LIST, MODEL 2825A-11, WEATHER RESISTANT AC POWER MODULE ................. 35 7.4 PARTS LIST, MODEL 2825A-12, WEATHER RESISTANT AC POWER MODULE & DSP3 HELIUM UNSCRAMBLER OPTION ........................................................................................... 35 7.5 PARTS LIST, MODEL 2825A-13, WEATHER RESISTANT AC POWER MODULE & 28B WIRELESS TENDER OPTION ................................................................................................... 36 7.6 PARTS LIST, 2820-302 CASE ASSEMBLY WITH POWER ENTRY MODULE ........................ 36 7.7 28XXA-FS-02 FIELD SPARES KIT FOR 2820A, 2825A ............................................................ 36 8 LIMITED WARRANTY AND SERVICE POLICY ................................................................................ 38

282XA-UM REV 5.0 1 1 INTRODUCTION AND SPECIFICATIONS 1.1 INTRODUCTION Congratulations on purchasing the most advanced and powerful portable communicator in the diving industry! Our engineering team has integrated the latest in digital advancements to produce the industry’s most intelligible and reliable diver communicators. Our built-in quality that Amron is known for makes the 2820A & 2825A series the most versatile and durable communicators anywhere in the world! The AMCOM II Series is a family of full-featured hard-wired, two-diver communicators. The AMCOM II is offered in two basic versions. The units are identical except the Model 2825A series has independent microphone and earphone volume controls for each diver and the tender. The 2820A series has a single earphone volume control for diver’s volume (down- link) and a single volume control for the tender (up-link). All models come standard with a built-in internal charger and can be operated from either a 90-264 VAC, internal 12 VDC battery, or an external 12 VDC power source. All communicators are supplied with an outdoor weather resistant AC power entry module located on the case, and country specific locking AC power cord of your choice. There are options available to fit your application such as DSP3 Helium Speech Unscrambler and 28B Wireless Tender. The 2820A-XX and 2825A-XX series has the ability to operate in the 2-Wire and Full Duplex (4-Wire) mode, as well as both modes being used simultaneously. Full Duplex (4-Wire) mode is required when using the Inhalation Noise Reduction or Wireless Tender features. Only Amron offers Microphone Auto Detection that identifies the type of microphone each diver is using and automatically adjusts for optimum performance. This portable diving communicator has the ability to work with both dynamic and pre-amplified microphones in either 2-Wire or 4-Wire modes. 1.2 SPECIFICATIONS Input Impedance (Each Input) ................................................................................... 250 Ohms Frequency Response ........................................................................................ 300 - 10000 Hz Common Mode Rejection .................................................................................. 40 dB Minimum Current Drain Maximum Full Volume ............................................................................. 3 Amps Minimum Quiescent ................................................................................................ 0.190 Amps Output Impedance ........................................................................................................... 4 Ohm Power Supply Voltage .............................................. 12 VDC Nominal (9 VDC Min - 16 VDC Max) AC Power Operating Range .................................................................... 90-264 VAC, 50-60 Hz Sensitivity (Input) ............................................................................................................. 0.5 mV Output Power (RMS @ 4 Ohm Load, 12 VDC) .................................................. 10 Watts Audio