GAI-Tronics 702 Benutzerhandbuch - Seite 3
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Model 701-202 Handset/Speaker Amplifier
Maintenance
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.
\\s_eng\gtcproddocs\standard ioms - current release\42004 instr. manuals\42004-311a.doc
11/03
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 (
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 TB1-8 to TB1-7.
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 Publication 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. 42004-311A
Solution
1
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