Service and troubleshooting
8.4 EST3 Installation and Service Manual
Removing or replacing circuit modules
When removing or replacing circuit modules, always remember
to:
1. First disconnect the battery then remove AC power.
Removing or replacing circuit modules when power is
applied will damage the equipment.
2. Avoid applying excessive force to the snap-rivet fasteners
that lock the plug-in modules in place. If needed, use the
extraction tool provided in the hardware kit.
Recommended spares list
As a general guideline, 10% of the quantity installed or a
minimum of 1 each of the following installed equipment should be
available as spare:
• Power supply
• Local rail modules
• Amplifiers (if no backup installed in system)
• Printer ribbon
As a general guideline, 10% of the quantity installed or a
minimum of 3 each of the following installed equipment should be
available as spare:
• Monitor modules
• Control modules
• Heat detectors
• Ionization smoke detectors
• Photoelectric smoke detectors
• Base, detector
• Duct detector filter kits
• Breakglass replacement for pull stations
• Breakglass replacement for warden stations
• Horn, bell, strobe, and speaker
System batteries should be replaced at recommended intervals.
Stocking of spare batteries is not recommended because of
shelf-life limitations.
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