EST3 Installation and Service Manual 8.1
Chapter 8
Service and troubleshooting
Summary
This chapter provides a comprehensive set of procedures and
tables to aid certified technical personnel in servicing and
troubleshooting the system.
Content
Overview • 8.3
Maintenance philosophy • 8.3
Problem classification • 8.3
Handling static-sensitive circuit modules • 8.3
Removing or replacing circuit modules • 8.4
Recommended spares list • 8.4
Hardware problems • 8.5
Identification • 8.5
Isolation • 8.5
Substituting hardware • 8.5
Adding hardware • 8.6
Downloading problems • 8.6
Modules • 8.7
Rail signals • 8.7
3-PPS/M Primary Power Supply module • 8.7
3-BPS/M Booster Power Supply module • 8.9
CPU Central Processor module • 8.9
3-FIBMB fiber optic interface • 8.13
Signature Controller modules • 8.14
Control / display modules • 8.14
Audio amplifier modules • 8.15
3-OPS Off-Premises Signal module • 8.16
3-IDC8/4 Initiating Device Circuit module • 8.16
3-LDSM Display Support module • 8.17
3-MODCOM(P) Modem Communicator module • 8.17
Common causes of problems • 8.18
Audio components • 8.20
3-ASU Audio Source Unit • 8.20
3-FTCU Firefighter Telephone Control Unit • 8.21
SIGA audio amplifiers • 8.21
Pseudo point descriptions • 8.24
Signature data circuit (SDC) operation • 8.35
Basic Signature data circuit troubleshooting • 8.37
Isolating circuit and device problems • 8.37
Open circuit conditions • 8.37
Short circuit conditions • 8.38
Ground fault conditions • 8.39
Substituting known good Signature series devices • 8.41
Signature controller modules • 8.47
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