Guardian Telecom Inc.
Installation and Operation
Model ExP-TBA
F R O M F A C E P L A T E
S U B A S S E M B L Y
T R A N S F O R M E R
M a s te r S p e a k e r +
1
E x te rn a l P T T S w itc h -
E x te rn a l P T T S w itc h +
M a s te r S p e a k e r G ro u n d
M a s te r S p e a k e r -
J 1
D E T A IL A
4
5
2
3
T -1 0 -8 1 3 8 9 0 0
1
T O N E /O F F
J P 1
M A S T E R S P E A K E R A T T E N U A T IO N L E V E L
A D J U S T M E N T
T R A N S F O R M E R
M A S T E R S P E A K E R /
S W IT C H T E R M IN A L
D E T A IL A
R 2 1
F R O M S M A L L
J 6
T -1 0 -8 1 3 8 9 0 0
F R O M S M A L L
J 4
J 1
S la v e S p e a k e r +
S la v e S p e a k e r -
S la v e S p e a k e r G ro u n d
P T T /R in g S w itc h +
P T T /R in g S w itc h -
S L A V E S P E A K E R /S W IT C H T E R M IN A L
R IN G V O L U M E
A D J U S T M E N T
R 5 4
1
J 3
D E T A IL B
N e u tra l
G ro u n d
H o t
2
3
1
J 7
D E T A IL C
4
5
2
3
J 7
D E T A IL C
F R O M L A R G E T R A N S F O R M E R T R C -2 5 5 -C 1 2
T E R M IN A L S
IN P U T A D J U S T M E N T
R 2 4
M IC IN P U T
A D J U S T M E N T
R 4 3
D E T A IL B
A C P O W E R
J 3
2 4 V A C /D C P O W E R IN P U T
J 5
J 2
S L A V E S P E A K E R T A L K B A C K
Figure 5 - Circuit Board Layout
Controls
Adjusting Pots:
PCB Mounted:
•
R21: Master Station speaker attenuation control.
•
R24: Microphone input volume control (internal mic. or speaker as mic.)
•
R43: Slave Speaker talk/back input volume control.
•
R54: Ring tone volume control.
Faceplate Mounted:
1)
Master Station speaker volume control.
2)
Slave Speaker volume control.
Post announcement tone jumper:
JP1; ON position: Post announcement enabled.
JP1; OFF position: Post announcement disabled.
Figure 6 - Control Pots and Wiring
Page 9
