4-7
Table 4-1 shows several indications of problems with potential causes associated
with each.
Table 4-1. Troubleshooting Chart
Indication of Problem Areas to Check
If the LCD display and LED indicators
all appear to be without power
Check the primary AC power and battery voltage
If the primary AC power is within the
operational range of approximately
100 - 132VAC
Check to see that the tap voltages are available
If the tap voltages appear to be down Check for proper installation of the power enable jumpers on
the Power I/O Interface assembly.
• P11, P12, P10 & P14 on Part No. 565-256
• P3, P4 & P6 on version Part No. 565-220
Then, if necessary, check for proper Standard Slave / Power
I/O initialization.
• Trouble LED turns on during initialization
• Green Power I/O Interface LED turns on if 28V power
and AC line voltage is available
• Standard Slave tests EPROM & RAM and will hang if an
error occurs
• Standard Slave checks AC power and battery voltage
level and will hang on low levels
• A, B & C-tap voltage levels are checked
Check for 36V Mapnet voltage. If voltage is present, Standard
Slave should be communicating with the Master Controller.
If a ground fault is being reported Check the following:
• I/O circuit wiring for ground faults
•
Di
scolored MOV devices
• Does the fault disappear when drop panel is opened (
see
pg. 3-2, “Ground Faults”
)
• If none of above, try swapping power supply
If an I/O circuit short or open trouble
condition is reported
Check the following:
• Standard Slave open circuit or burned R35, R36, R70, or
R77 10 ohm resistors
• Check for field wiring shorts between signal circuits
• Check for A/V Appliance power jumpers not removed to
isolate horn & strobe circuits
• Check for multiple ground faults between I/O circuits and
earth
• Are the proper I/O plugs installed and seated properly
Continued on next page
Troubleshooting Procedures,
Continued
Troubleshooting Chart
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