T ABLE
6.1
SYSTEM FAULT LOC ATION
SYMPTOM
1.
System in mains
fail.
2.
Speech or sig
nalling fault on one
terminal.
3.
Speech or sig
nalling fault on all
terminals
POSSIBLE FAULT
A.
Loss of power
supply
B.
Failure of power
supply or control
circuits
A.
telephone speech
circuit
B .
key module switch
or LED fault
ACTION
1)
check fuse
2) check incoming
mains supply
1)
change CCU
1)
check using
test telephone
2) check extn
wiring and
line jack
1
)check extn
wiring
2 ) c h a n g e key
module
C.
control circuit
1)
change CCU
or extension interface
circuit failure.
A.
Loss of power
supply
1)
check fuse
2) check mains
supply
B.
failure of control
1)
change CCU
or power supply
circuits.
6.3.l
Changing the CCU
Having proved that the CCU is faulty, the unit minus its
cover should be replaced as follows:-
First disconnect the unit from the mains supply and then
remove the cover.
Mark for identification purposes and
disconnect the wires connected to the screw terminals, and
rem ove the CCU from the wall.
Refer to the installation
section of this manual when fitting the replacement unit.
T he c ustomers o r i g i n a l c over sho u l d be f itted to the
replacement unit and the new cover returned with the faulty
unit.
Page 28 of
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Summary of Contents for ESCORT
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