User manual ACR ELECTRONICS ACR-EM-2BA REV K

[. . . ] MANY QUESTIONS CAN BE ANSWERED OVER THE PHONE. Y1-03-0057 Rev. K TABLE OF CONTENTS SECTION 1 ­ DESCRIPTION SECTION 2 ­ OPERATION SECTION 3 ­ MAINTENANCE 3. 1 Cleaning 3. 2 Battery Replacement 4 4 5 5 5 SECTION 4 ­ TESTING, TROUBLESHOOTING & REPAIR 4. 1 Testing 4. 2 Repair 5 5 6 SECTION 5 ­ DISASSEMBLY & ASSEMBLY 5. 1 Disassembly 5. 2 Assembly 6 6 6 SECTION 6 ­ PARTS LIST SECTION 7 ­ TECHNICAL DATA APPENDIX - WARRANTY, USEFUL LIFE, NOTICES A. 1 Limited Warranty A. 2 Useful Life Policy A. 3 Notices 7 8 9 9 9 9 3 Y1-03-0057 Rev. K SECTION 1 ­ DESCRIPTION The ACR/EM-2BA is a battery operated solid state megaphone specifically developed for use in enclosed areas such as in the interior of an aircraft or ship cabin. It has been designed to minimize regenerative acoustic feedback that results in whistling and other oscillations of this nature. [. . . ] If no sound is heard, remove the microphone and mouthpiece assembly and the batteries. Check that both the microphone and battery contacts are clean. If not, clean with a mild, non-abrasive cleaner such as alcohol. Test amplifier and speaker assembly by replacing the microphone with a spare microphone assembly. If no sound can be produced after microphone replacement, it may be assumed that the amplifier or speaker assembly is defective. To test the speaker, disassemble the speaker. Unplug the wires and apply 1 ½ volts intermittently across the speaker. If no clicks are heard, the speaker is defective. Possible faults and corrections are summarized below for ready reference. TROUBLE POSSIBLE CAUSE CORRECTION No sound from speaker Exhausted batteries, defective Replace defective component when handle is squeezed microphone, speaker or (Step 1) amplifier assembly Sound is abnormally low or Exhausted batteries or wrong Check proper insertion of distorted polarity of battery series batteries or replace batteries. Speaker does not respond to Defective speaker Step 4 5 Replace speaker Y1-03-0057 Rev. K 4. 2 Repair The megaphone consists of three major sub-assemblies; the microphone and mouthpiece assembly, the megaphone sub-assembly, and the horn and speaker assembly. Repairs are restricted to the replacement of these defective sub-assemblies or the batteries and lanyard assemblies. SECTION 5 ­ DISASSEMBLY & ASSEMBLY 5. 1 Disassembly 1. Megaphone should be disassembled for repair or replacement of components only. Remove microphone and mouthpiece assembly (1) by removing the three set screws (). Remove battery cells (3) from the three tubes by tilting megaphone to allow cells to drop out into the hand. Remove the three oval head screws (9) at periphery of the speaker end of the housing (13). Extract speaker & megaphone subassembly by firstly turning horn (14) clockwise approximately 45°. Secondly pull the entire assembly gently until it stops. Rotate the assembly counterclockwise 45° then pull the entire assembly out. Separate the speaker assembly (5) and megaphone subassembly (8) by firstly unplugging the speaker wires from the "out" header. Then, remove the hex screw that holds the assemblies together. Inspect unit for any evidence of damaged parts, loose mountings or broken leads and dirty electrical contacts. 5. 2 Assembly 1. [. . . ] To place the warranty in effect, register online at www. acrelectronics. com or return the attached card within 10 days. *Five years for the following products: EPIRB, PLB, S-VDR, SSAS. A. 2 Useful Life Policy The typical service life of a properly maintained Product is limited to 1 years from date of manufacture. Products that are 1 years and 1 month or older from date of manufacture will not be serviced by ACR or our Battery Replacement Centers. A Product that is 1 or less years old from date of manufacture will be serviced as long as the unit appears fit to be placed back into its final operational cycle. [. . . ]