Operation Manual

89-042 Issue 5 49
6 Troubleshooting
Perform the following checks BEFORE calling an authorised Service Centre.
Symptom Cause Cure
1) No power to
Transponder
2) System fuse
blown
No Green light illuminated on
Transponder
1) Check fuse or circuit
breaker at 24VDC
supply point.
2) Check/replace system
fuse in Transponder.
Use only 10Amp blade type
fuse
No text on screen
1) VDU installation
2) Display fuse
blown
Green light is illuminated on
Transponder
1) Check display
cable/connections
2) Check display fuse in
Transponder.
Use only 1Amp blade type
fuse
Text appears on screen
but is too dark or light to
read
LCD backlight and/or
contrast out of
adjustment
1) Select Display
Brightness from Main
menu
2) Adjust LCD backlight
and/or contrast (See
section 3.36 Display
Brightness Menu on
page 29)
At power-up, self-test
shows one of the
following messages: -
ROM : Error
RAM : Error
FLASH : Error
Central processor
failure
Contact Service Centre
Tx malfunction alarm
activates
Transmitter PCB
failure
Contact Service Centre