GAI-Tronics 700 Series 24 V DC Page/Party Systems - Manual (Page 7)

Pub. 42004-140E
Installation of GAI-Tronics 700 Series 24 V DC Page/Party
®
Systems Page 7 of 13
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Step 5 — Installation of Amplifiers and Subsets
One of the many features of GAI-Tronics Page/Party ® system equipment is automatic speaker muting.
When the push-to-page switch is pressed at a particular station, the paging speaker connected to that
station is silenced, preventing acoustic feedback to the handset microphone. However, while the handset
is in use for the party line conversations, the paging speaker is still live to paging calls from other stations.
For cases where the muting feature is not necessary or may be a disadvantage, it can be defeated as
outlined below.
Muting Defeat Instructions
1. Locate lugged violet wire attached to terminal point 7 (mute) on the terminal block within the
enclosure for station to be modified.
2. Transfer lugged violet wire to terminal point 8 (Page L1).
After making any necessary muting changes, unpack and install the amplifier for each station. Also,
unpack remote subsets (for desktop, desk-edge or panel mount stations) and plug each into the bottom
sides of the amplifier enclosure. Please see the chart on page 5 for series numbers covered by this
bulletin.
Step 6 — Checkout and Adjustment
Test all field wiring connections (page line, party line(s), mute, dc power and speaker) between stations,
and complete the line balance assembly installation before checkout begins. Ensure that all handsets are
on-hook.
1. Apply dc power, and check the station next to the line balance assembly.
2. Press the push-to-page switch (in the handset handle on some stations) and speak directly into the
microphone of the handset. The broadcast should be heard at all paging speakers in the system except
those associated with the station under test.
If working properly, very little or none of your own voice (sidetone) is heard from the handset
earpiece. If the line balance assembly is not connected properly, there will be a high level of
sidetone, perhaps enough to cause feedback.
Adjust the line balance assembly to optimize sidetone rejection on the page line. If the system is
complete when the first station is checked, adjust the line balance assembly as noted below.
Do not adjust station (amplifier) controls until the line balance assembly is adjusted.
3. Release the push-to-page switch and check the party line(s) sidetone level by speaking into the
microphone of the handset.
If working properly, very little or none of your own voice is heard from the handset earpiece. This
sidetone rejection only occurs if the line balance assembly is properly connected because it contains a
fixed resistor load for each party line. In addition, no party line adjustments are provided. Check
party line operation by conversing between two or more stations.