GAI-Tronics ITR1000-001 Model ITR1000-001 Basic Tone Remote Deskset with Line Select User and Installation Manual - Manual (Page 4)

Table of Contents ITR1000-001 Basic Tone Remote Desk Set
02/12 Pub. 43004-032C iii
P OWER C ONNECTIONS .............................................................................................................................................. 12
L INE C ONNECTIONS .................................................................................................................................................. 13
Line Considerations - Private Circuit ................................................................................................................. 13
Circuit Conditioning ........................................................................................................................................... 13
S ETTINGS AND A DJUSTMENTS .................................................................................................................................. 14
Line (Receive Audio) Input Level Adjustment ..................................................................................................... 14
Line Output (Transmit) Level Adjustment ........................................................................................................... 14
Audio Level Setting Procedure ........................................................................................................................... 15
2175 Hz Filter Adjustment .................................................................................................................................. 16
Handset Microphone Adjustment ........................................................................................................................ 16
D ESK S ET R EASSEMBLY ........................................................................................................................................... 16
P ROGRAMMING ........................................................................................................................................................ 17
High Level Guard Tone Durations ..................................................................................................................... 18
Function Tone Durations .................................................................................................................................... 18
Function Tone Frequencies ................................................................................................................................ 19
P ROGRAMMING M ODE ............................................................................................................................................. 20
THEORY OF OPERATION .................................................................................................................................... 21
D IGITAL C IRCUITS .................................................................................................................................................... 21
Analog-to-Digital Conversions ........................................................................................................................... 21
Serial Peripheral Interface ................................................................................................................................. 21
A UDIO C IRCUITS ...................................................................................................................................................... 21
S PEAKER V OLUME C ONTROL ................................................................................................................................... 22
P OWER S UPPLIES ...................................................................................................................................................... 22
L INE S ELECT ............................................................................................................................................................ 22
TROUBLESHOOTING ............................................................................................................................................ 23
T ROUBLESHOOTING THE ITR1000-001 B ASIC T ONE R EMOTE D ESK S ET ................................................................. 23
F USE R EPLACEMENT ................................................................................................................................................ 24
MAIN CIRCUIT BOARD ........................................................................................................................................ 25
SCHEMATICS .......................................................................................................................................................... 27
DEFINITIONS AND ACRONYMS ......................................................................................................................... 35