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The following table will help identify and locate possible malfunctions in the event of a system failure.
Problem
Possible Cause
Possible Remedy
Fail LED flashing
Transmitter failure
Loop open or shorted
Check transmitter manual
Continuous high alarm
condition
Transmitter failure
High gas condition
Alarms in latched mode
Check transmitter manual
Normal
Press Reset button
Function switches not
operating correctly
Function switches
Ribbon cable
Replace Display/Function
Assembly
Replace/tighten Ribbon cable
LCD not indicating
correct data
CPU PS board failure
Ribbon cable
Display board
Replace CPU/PS boards
Replace/tighten cable
Replace Display board
No visible displays
on front panel
No power input
Ribbon cable
CPU/PS board
Check input voltage
Replace/tighten cable
Replace CPU/PS boards
Blown fuse on power supply
All programming functions
inoperable
Ribbon cable
CPU/PS boards
Replace/tighten Ribbon cable
Replace CPU/PS boards
Common relays inoperable
CPU/PS boards
Replace CPU/PS boards
Common Warn, or Alarm,
or Fail or Horn relays
inoperable
Relay
CPU/PS boards
Replace Relay
Replace CPU/PS boards
Internal Horn not functional
Horn
Horn connector
CPU/PS boards
Display board
Replace Horn
Reconnect or Replace
Replace CPU/PS boards
Replace Display board
No current output
No current input
Check transmitter manual
Содержание QuadScan II 7400
Страница 10: ...5 of 116 Quick Start Programming Menu Tree...
Страница 20: ...15 of 116 Figure 5 Mounting Dimensions of Model 7400...
Страница 24: ...19 of 116 Figure 9 Battery Backup P N 096 0719 Outline Interconnection Wiring...
Страница 60: ...55 of 116 Figure 13 Interconnect Wiring Between 7400 Remote Relay Assembly...