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This troubleshooting guide provides you with a basic understanding of the 4020
Fire Alarm Control Panel operation and suggestions for quickly finding and
resolving problems.
The primary goal is to provide a method by which you may troubleshoot the
4020 basic system assemblies:
• Master Controller
• Standard Slave
• Power I/O Interface
• Power Supply
It is assumed that any defective system can be broken down into this minimum
configuration as the first step in troubleshooting a problem.
This document is divided into five Chapters:
1. About this Document Describes this document’s structure.
2. Basic System/Sub-Assembly Describes the 4020 system. Includes
Block Diagrams, and PCB layouts.
3. 4020 Problem Experience Describes commonly occurring
problems based on Service repair
experience.
4. Troubleshooting Procedures Provides problem indications with
their associated potential causes.
Includes a Troubleshooting Chart
(page 4-7)
5. Standard Slave Software
Initialization
Describes the sequence of events
during the Standard Slave Card
initialization process.
Chapter 1
About This Document
Introduction
Chapter Content
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