Smoke Alarm User Manual

Installation, Operation and Maintenance Manual
Issue 1 Page 8-1
February 2001
8 TROUBLE SHOOTING AND CORRECTIVE MAINTENANCE
8.1 Introduction
The effectiveness of this chapter is greatly increased by first reading previous chapters of this manual.
The service technician must have a clear understanding of the purpose and correct function of the
Detector before attempting corrective maintenance. The following paragraphs contain instructions to aid
a technician in identifying and rectifying faulty components. LaserNET software should be employed as a
diagnostic tool.
8.2 Standard Fault Isolation Techniques
Trouble indications registered by the Detector include:
(1) CPU Trouble
(2) Airflow Trouble
(3) PSU Trouble
(4) Detector Trouble
(5) PC Line Trouble
(6) Un-registered Display Module trouble
(7) Communications Trouble
Some of these troubles may indicate that the termination board and/or detector head are not functioning
properly. Such failures will usually be caused by one or more of the following fault conditions:
(1) Failure of the power supply
(2) Damaged wiring or corrosion
(3) Component failure
(4) Wiring not properly terminated to the Detector.
(5) Problems associated with the pipe network system.
When a failure occurs and the cause is not known, check as many of these items as is practical before
starting a detailed check. If possible, obtain information about any changes that have taken place that
may affect the system.
8.2.1 Visual Inspection
When troubleshooting, the fault may often be discovered through visual inspection alone. Check for
burned or overheated parts. Check for loose connections. Visual inspection is also useful in avoiding
damage to the system which may occur through improper servicing methods.
8.2.2 Power Checks
Ensure that the modules comprising the HSSD system are receiving the correct power-supply voltages
before disassembling the system.