User Guide

After Sales
Technical Documentation
THA–4S
Troubleshooting Guide
Page 4
Original, 12/95
Introduction
The following pages in this guide contain useful flow charts designed to
assist with system faultfinding.
General Faults
Off Current
consumption >
0.5mA
Y
N
DC Fault
Y
N
Y
N
Y
N
Y
N
Y
N
Y
N
Will turn into
local mode
Logic fault
Receiver O.K
Receiver fault
Transmitter O.K
Transmitter fault
Earphone
level/modulation
OK
Earphone
level/modulation
OK
Display/keypad
working
Display/keypad
fault
Call set–up
Call set–up fault
END
START