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

[. . . ] The amplifier frequency band-pass has been selected to produce a crisp, clear reproduction of voice signals. The operating power level is also sufficient to provide adequate sound under high ambient noise level conditions without being over-powering. Specific attention has been given to the physical size so that it can be used effectively in a crowded environment. The integrated circuit amplifier only uses a small current when turned "ON". [. . . ] CAUTION: Observe polarity of cells carefully before replacement. 3. 2 Battery Replacement SECTION 4 ­ TESTING, TROUBLESHOOTING & REPAIR Note: The megaphone consists of three major assemblies; the microphone and mouthpiece assembly, the megaphone sub-assembly, and the horn and speaker assembly. To locate a defect, follow the procedure outlined below: 4. 1 Testing 1. If no sound is heard, remove the microphone and mouthpiece assembly and the batteries. 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. 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°. 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. Inspect unit for any evidence of damaged parts, loose mountings or broken leads and dirty electrical contacts. 5. 2 Assembly 1. . Align horn (14) and speaker assembly (5) with location pins on megaphone subassembly (8). [. . . ] This warranty does not apply if the product has been damaged by accident or misuse, or as a result of service or modification performed by an unauthorized factory. Except as otherwise expressly stated in the previous paragraph, THE COMPANY MAKES NO REPRESENTATION OR WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, AS TO MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR ANY OTHER MATTER WITH RESPECT TO THIS PRODUCT. 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. [. . . ]