4-1
Generally speaking, the first step in troubleshooting is to determine what the
customer knows about the problem. For example:
• Was panel alarm sounding and then cleared?
• Has the system been restarted since the problem occurred?
• Was the system being upgraded at the time of failure?
• Was any work being done on the building wiring?
• Were any trouble indications being reported?
• Was any other building equipment damaged by lightning or line transients?
Determine if any portion of the 4020 system appears to be operational.
Check the individual assemblies for signs of visible damage.
Check for any loose or dislodged interconnecting cables between the Master
Controller, Standard Slave, Power I/O Interface and Power Supply.
If the display does not work, start by checking +5V power, Tap voltages, and
36V Mapnet power. (Refer to Figure 2-7, page 2-10 for information on locating
voltage test points.)
The typical selections on a Standard Slave PCB assembly are as follows:
Standard Slave Board (565-222 or 565-368)
• SW1: 1–7
ON
; 8
OFF
(Address 01, Baud rate 9600 )
• SW2: Batteries selection. Standard: 1–3
ON
, 4
OFF
for lead acid battery.
• I/O configuration plugs (signal, monitor, security, no plug for auxiliary)
565-368 Standard Slave with U11 741-033 software is required for use with:
• 636-341 Universal Switcher Power Supply
• 565-256 Power I/O Interface PCB
565-222 Standard Slave with U11 741-008 software is required for use with:
• 636-289 Power Supply (Black Hawk) or 636-370 w/charger adapter
• 565-220 Power I/O Interface PCB
Continued on next page
Chapter 4
Troubleshooting Procedures
General Approach
Checking Typical Standard
Slave Card Selections
Matching Standard Slave and
Software Versions
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