GAI-Tronics 709-901 Panduan Pengguna - Halaman 11

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Halaman Cetak

709-901 S

ODEL

MART

ERIES

Internal Adjustments

CAUTION

To reduce the risk of ignition of hazardous atmospheres, disconnect the equipment from the supply

circuit before making any adjustments to the amplifier's handset level.

Although they typically require no adjustments, the following volume levels can be set internally:

Sidetone Volume and Handset Receiver Volume

To make an adjustment it is necessary to remove the assembly from its enclosure and make a temporary

connection between the assembly and the enclosure. Refer to Figure 2 for the reference numbers and

locations of the adjustment controls. Turn a control clockwise to increase the volume or threshold; turn it

counterclockwise to decrease the volume or threshold. Use a small flat-blade screwdriver with an

insulated shaft to make adjustments.

To access the controls, perform the following steps:

1. Loosen the four screws that secure the front panel.

2. Remove the assembly from the enclosure. If the enclosure is equipped with an optional EOL Module

or SmartSeries station RTU, be careful to not disconnect the ribbon cable on J2 of the Speaker

Amp/Power Supply PCBA.

3. Connect the assembly to the enclosure using a Model 10440-002 Maintenance Cable between P1 on

the assembly and J1 on the enclosure.

4. Locate and adjust the control on the appropriate PCBA.

5. When you are finished with the adjustment:

a) Disconnect the Model 10440-002 Maintenance Cable.

b) Insert the assembly into the enclosure.

c) Tighten the four screws.

Handset Receiver Volume

Use the control labeled RCVR VOL (Ref. 7, on the Handset/FSK/P PCBA) to adjust to the desired level

the handset receiver volume for voice signals from a party line.

Sidetone Volume

The control labeled SIDETONE (Ref. 4, on the Handset/FSK/P PCBA) adjusts the handset/headset

sidetone.

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