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RTK Series 725 Annunciator

31. Maintenance

31.1 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.

31.2 Removing Filter Assemblies

See Section 3.4.

31.3 Changing Film Legend

See Section 3.4.

31.4 Changing Bulbs/LED Assemblies

After removal of the filter assembly the lamp holder will be visible. A lamp test pushbutton can be

pressed to ascertain which lamps have failed; it is then a simple matter to remove the faulty bulbs.

These bulbs are standard 10mm glass wedge and can be removed by pulling directly away from the

lamp holder with a pair of pliers or the standard lamp remover supplied with the unit. Replace by

reversing the procedure, taking care that the wedge base is correctly located in the socket before

pressing home. 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.

31.5 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.

31.6 Position Of Fuses On The Supply Card

10 A/T

1 A/F

RTK 725 Series User Manual

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