GAI-Tronics 12580-001 Audio Distribution Module - Manual (Page 15)

Pub. 42004-600L2C
Model 12580-001 Amplifier Distribution/Monitor Module Page: 15 of 17
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How to Maintain the Assembly
This section describes maintenance for the Amplifier Distribution/Monitor Module and lists its
specifications and replacement parts.
Maintenance
WARNING
Disconnect power to the ADM and central amplifiers before servicing.
1. Inspect and replace frayed or cracked wiring.
2. Secure/replace loose wires and spade terminals.
3. Remove corrosion from terminals.
Adjustments
The ADM contains two adjustable controls; a Reference Level adjustment, and a Tone Level adjustment.
• The Reference Level adjustment, R88 , sets a reference point (trip point). The Tone Level must exceed
the reference level to enable detection of the Supervisory Tone.
• The Tone Level Adjustment, R75, controls the Supervisory Tone signal level applied to the detector.
These adjustments are set at the factory for a 70.7 V central amplifier system. Additional adjustments
may be required during installation to meet the requirements of your system. Use a straight blade
screwdriver and a dc voltmeter to make adjustments.