GAI-Tronics ITR1000A User And Installation Manual - page 4
Table of Contents
ITR1000A Basic Tone Remote Desk Set
01/05
Publication 43004-002B
iii
Line Considerations - Private Circuit................................................................................................................13
Circuit Conditioning ...........................................................................................................................................13
S
ETTINGS AND
A
DJUSTMENTS
..................................................................................................................................13
Line (Receive Audio) Input Level Adjustment.....................................................................................................13
Line Output (Transmit) Level Adjustment...........................................................................................................14
Audio Level Setting Procedure ...........................................................................................................................14
2175 Hz Filter Adjustment..................................................................................................................................15
Handset Microphone Adjustment........................................................................................................................15
D
ESK
S
ET
R
EASSEMBLY
...........................................................................................................................................15
P
ROGRAMMING
........................................................................................................................................................16
High Level Guard Tone Durations .....................................................................................................................16
Function Tone Durations....................................................................................................................................16
Function Tone Frequencies ................................................................................................................................17
P
ROGRAMMING
M
ODE
.............................................................................................................................................18
THEORY OF OPERATION ....................................................................................................................................19
D
IGITAL
C
IRCUITS
....................................................................................................................................................19
Analog-to-Digital Conversions...........................................................................................................................19
Serial Peripheral Interface .................................................................................................................................19
A
UDIO
C
IRCUITS
......................................................................................................................................................19
S
PEAKER
V
OLUME
C
ONTROL
...................................................................................................................................20
P
OWER
S
UPPLIES
......................................................................................................................................................20
TROUBLESHOOTING............................................................................................................................................21
T
ROUBLESHOOTING THE
ITR1000A B
ASIC
T
ONE
R
EMOTE
D
ESK
S
ET
.....................................................................21
F
USE
R
EPLACEMENT
................................................................................................................................................22
MAIN CIRCUIT BOARD ........................................................................................................................................23
SCHEMATICS ..........................................................................................................................................................25
DEFINITIONS AND ACRONYMS.........................................................................................................................33