Pub. 42004-365B
Model 701-305 Handset/Speaker Amplifier
Page:
4 of 6
f:\standard ioms - current release\42004 instr. manuals\42004-365b.doc
11/10
Troubleshooting
The following table lists some hints to aid technicians in troubleshooting:
Problem Solution
Any problem with station
performance occurs.
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.
Integral speaker level requires
adjustment.
1.
Adjust the volume control behind the nameplate on the front panel.
2.
Replace the speaker or driver.
Outgoing conversation level
requires adjustment.
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 (
1
/
8
-inch
blade) to slowly turn potentiometer (R17) on the rear chassis of
amplifier until reaching the proper microphone gain.
2.
Replace the handset microphone.
Incoming conversation level
requires adjustment.
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.
Feedback/distortion (a hum or
buzz on the line) occurs during
all Page/Party
®
station
operation.
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.
Feedback occurs only during
page.
Use the muting feature in the amplifier enclosure at the terminal blocks.
Connect the violet wire at terminal 8 to terminal 7.
Sidetone (how the operator
hears his own voice) requires
adjustment.
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.
Crosstalk occurs.
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.