GAI-Tronics 780-001 Explosion-proof Handset Stations - Manual (Page 6)

Pub. 42004-156D
Model 780/785-001 and 7805/7855-001 Explosion-proof Handset Stations Page: 6 of 12
\\s_eng\gtcproddocs\standard ioms - current release\42004 instr. manuals\42004-156d.doc
03/04
Speaker Muting Information
These stations are equipped with a muting feature that is used if the station is located near other
handset/speaker stations. This feature prevents acoustic feedback between stations during paging by
muting the station’s associated speaker. These stations are shipped from the factory with the mute feature
enabled.
To disable the muting feature, remove jumper W6 located on the 10489-001 Termination PCBA. The
chart below describes how the muting function operates when specific combinations of wire jumpers W3,
W4, W5, and W6 are installed on the Termination PCBA.
W3 W4 W5 W6 Description of Muting Function Operation
O X X X The AUX/PAGE inputs to the amplifier are muted during station page
(as shipped from GAI-Tronics).
O X X O The AUX/PAGE inputs to the amplifier are not muted during a station page.
O X O X Mute the PAGE input only during a station page.
X X O X The PAGE input is muted during a station page or by contact closure between
the Mute A and B inputs.
X O X X The PAGE/AUX inputs are muted during a station page or by contact closure
between the Mute A and B inputs.
X O O O The PAGE/AUX inputs are not muted. Isolated normally open relay contact
output between the Mute A and B terminals is closed during station pages.
X = Installed O = Not Installed.
Mutual Muting
Stations that are located closely together may require mutual muting of the page amplifiers. To set up
mutual muting between stations, connect the orange (spare) wire in the GAI-Tronics station cable to TB2-
11(A) on each of the Div. 1 stations that require muting. All the mutually muted stations are then muted
when any connected station is paging.
N
OTE : Jumpers W4, W5, and W6 must be installed.
Mutual muting can be accomplished between the Div. 1 stations and Div. 2 enclosures using most
GAI-Tronics 600 or 700 Series enclosures by connecting the orange (spare) wire between TB2-11(A) on
the Div. 1 station and TB1-7 on the Div. 2 enclosure:
Div. 1 Stations
TB2-11(A) Div. 2 Enclosures (TB1-7)
7805-001 702A 758-001 7335-001
780-001 732-101 703A
670-001 7325-101 733-001
Consult GAI-Tronics for any enclosures not listed.
N OTE : The auxiliary speaker amplifier input is a balanced 10 kilohm audio input.