Chapter 7: Service and troubleshooting
170 EST3X Technical Reference Manual
Precautions
Removing or replacing circuit board modules
When removing or replacing circuit modules, always remember to:
• First disconnect the battery then remove AC power from the control panel.
Removing or replacing circuit modules when power is applied will damage the
equipment.
• Avoid applying excessive force to the snap-rivet fasteners that lock the plug-in
modules in place. If needed, use the extraction tool provided in the hardware
kit.
Handling static sensitive circuit board modules
Many of the panel components are circuit boards that are sensitive to
electrostatic discharge. To avoid damage to the board, take the following
precautions:
• Use only approved grounding straps that are equipped with a 1 MΩ resistive
path to earth ground.
• Remove a circuit board module from its protective antistatic packaging only
for inspection or installation.
• Always hold circuit modules by the sides. Avoid touching component leads
and connector pins.
Panel restart problems
The EST3X system is designed to conduct a startup interrogation of the system’s
database integrity and its configured hardware. When a new CPU database is
downloaded to a panel, the panel restarts and validates the database. If a
database error is detected, the panel will attempt to restart, and in some cases
continually restart. If your panel continually restarts, recycle the panel several
times as described below to restore the system to its normal state.
To restore the system:
1. Disconnect battery wiring to the power supply.
2. Apply AC power to the panel and wait until the buzzer sounds.
3. After 5 to 10 seconds remove AC power, and then reapply power.
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