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32. Maintenance
PLEASE NOTE WHEN INSTALLED UNIT MUST BE DE-ENERGISED BEFORE ANY
MAINTAINACE IS UNDERTAKEN
32.1 No Special Tools
All normal maintenance and programming is carried out from the front of the annunciator without the
use of special tools. Filter and film legend changes and lamp and LED replacement are all
undertaken by unclipping the front filter assembly.
32.2 Removing Filter Assemblies
See Section 5.4.
32.3 Changing Film Legend
See Section 5.4.
32.4 Changing LED Assemblies
After removal of the filter assembly the lamp holder will be visible. A lamp test pushbutton can be
pressed to ascertain which LED’s have failed; it is then a simple matter to remove the faulty LED’s.
The LED assemblies are removed and replaced in exactly the same way accept that the glass wedge
is replaced with a small PCB connecting tag. The LED’s are not polarised so can be fitted in either
orientation.
32.5 Fuse Replacement
Two fuses protect the overall system, one protects the supply and motherboard (F1) and the other
protects the feed to the alarm contacts (F2). These are both situated on the supply card, which is
fitted in the SPR module. The location of the two fuses is shown below. Take care to replace fuses
with fuses of exactly the same type. Spare fuses are supplied with all annunciator shipments
WARNING: DO NOT REMOVE FUSES WHEN ENERGISED, AND ENSURE CORRECT RATED
AND TYPE OF FUSE IS USED AS SPECIFIED ON PCB MARKINGS
32.6 Position Of Fuses On The Supply Card
10 A/T
F1
1 A/F
F2
FR
SP
FR
SP
