Problem
No indications on the LCD
display, no buzzer
sounding.
‘P’ displayed preceding
time on LCD display
‘Main Receiver, Aerial
Tampered’ shown on
display and buzzer
sounding
‘Aerial Tampered, Call
Engineer, Antifalse’ shown
on display and buzzer
sounding
‘I’ displayed preceding
time on display
Persistent R.F.I.
‘Case Tampered’ shown on
display
Keyswitch does not
operate
‘Call In Fail’ shown on
display, with transmitter
ID
‘Call In Fail’ shown on
display, with transmitter
ID
Receiver does not
respond to a transmitter
Receiver does not
respond to a transmitter
Receiver does not
respond to a transmitter
Receiver does not
respond to a transmitter
Possible cause
No power to the system
Power below threshold of
10.2Vdc, +/- 0.3Vdc.
Aerial has been removed or
tampered with
Aerial not fitted correctly or
tampered with
Local radio frequency
interference
Local radio frequency
interference
Case is tampered front or
back.
Connector lead not fitted
correctly
Transmitter out of receiver
range
Transmitter battery has
expired
Transmitter not
programmed to system
Transmitter battery has
expired
Transmitter is not
compatible with system
Transmitter damaged
Action
Check power supply and fuses.
Re-power unit
Check power supply voltage
Check aerial is correctly fitted
or replace aerial
Check aerial is correctly fitted
or replace aerial
Refer to the
How to reduce
interference
section
Refer to the
How to reduce
interference
section
Check operation of front and
back tamper switches
Check connector lead is fitted
correctly
Refer to the
How to reduce
interference
section
Replace transmitter batteries
Refer to the
Adding a
transmitter
section
Replace transmitter batteries
See appendix 1 for compatible
transmitters
Replace transmitter or return
to EMS for repair
Helpful hints
Page 28 of 32
1.25A F
use
RL
Y2
CON3
L1
BOX
TA
MPER
1C
ON5
1C
ON4
C
TS
RX
0V
DT
R
TX
