GAI-Tronics 370-202, 372A Interface Amplifier Assembly for Electro-Sound - Manual (Page 6)

Pub. 42004-374A
Model 370-202 Interface Amplifier Assembly for Electro-Sound Page: 6 of 9
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07/05
One-Way Operation
If the Model 370-202 Interface is only used for one-way communication, jumper wires located on the
Model 370-202 two-way amplifier printed circuit card (69056-002) can be removed to improve amplifier
stability and performance.
If the Model 370-202 is used for one-way communications ONLY, complete the following adjustments:
1. For Electro-Sound system to the GTC system, cut Jumper W-4.
2. For the GTC system page line to Electro-Sound system or central amplifier, cut Jumper W-3.
When the Model 370-202 is operated in a one-way mode, the BALANCE control will have no effect on
operation. When W-4 is cut, only the LINE
TO GTC control will be functional. The GTC TO LINE
potentiometer will be active if W-3 is cut.
Model 370-202 Applications
In Figure 3, a Model 370-202 Interface allows the following options:
• paging to be initiated by either a Page/Party ® station or a three-wire Electro-Sound system
• two-way party line communication to occur at a prearranged time
Further, where a three-wire Electro-Sound system (Electro-Sound with paging) is installed and more than
ten Page/Party
® speaker amplifiers, (650 Series), are used to power the speakers, a Model 370-202
Interface is required. See 42004-072, the Electro-Sound Communications System installation manual, for
more information.