GAI-Tronics 701-305 Kurzanleitung - Seite 4

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Model 701-305 Handset/Speaker Amplifier

Troubleshooting

The following table lists some hints to aid technicians in troubleshooting:

Problem

Any problem with station

performance occurs.

Integral speaker level requires

adjustment.

Outgoing conversation level

requires adjustment.

Incoming conversation level

requires adjustment.

Feedback/distortion (a hum or

buzz on the line) occurs during

all Page/Party

station

operation.

Feedback occurs only during

page.

Sidetone (how the operator

hears his own voice) requires

adjustment.

Crosstalk occurs.

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Review all the steps of the installation, ensuring that you have correctly

followed ALL steps. Check all the terminations on the board and in the

line balance assembly before proceeding to any other adjustments.

1. Adjust the volume control behind the nameplate on the front panel.

2. Replace the speaker or driver.

1. Adjust the microphone gain by removing the front cover of the

station and attaching a Model 10440 Series extension ribbon cable

between the connectors. Use a small standard screwdriver (

blade) to slowly turn potentiometer (R17) on the rear chassis of

amplifier until reaching the proper microphone gain.

2. Replace the handset microphone.

1. Use a small standard screwdriver to adjust the receiver volume

control on the rear of the amplifier using the extension ribbon cable

assembly as described above.

2. Replace the receiver element in the handset.

1. Adjust the receiver sidetone on the rear of the amplifier using the

ribbon cable assembly as described above.

2. The line may be improperly terminated. Inspect the system cable

for loose connections, shorts, and grounds. Line balance assembly

connections are critical.

3. Replace the line balance assembly.

Use the muting feature in the amplifier enclosure at the terminal blocks.

Connect the violet wire at terminal 8 to terminal 7.

1. Adjust the receiver sidetone at the amplifier, using the extension

ribbon cable as described above.

2. Check that the line balance assembly resistors are connected

properly. See GAI-Tronics Pub. 42004-139.

One or more system cable pairs may be improperly terminated.

Visually inspect the system cable connections for accidental crossing of

the cable pairs or grounds.

Pub. 42004-365B

Solution

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