Alpha IA543 - Main System Diagram; Typical 4 Wire Station - Back View

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MAIN SYSTEM DIAGRAM
The IA543 amplifier has two serviceable adjustments for Voice Volume and Tone Volume located through two
access holes on the front cover. Use a small screwdriver and do not use excessive force. Carefully turn
clockwise to increase the volume. High volume setting may result in feedback oscillation.
TYPICAL 4 WIRE STATION – BACK VIEW