Chapter 7: Service and troubleshooting
P/N 3101890-EN • REV 006 • ISS 21JUN18 125
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 VM-1 system is designed to test its database integrity and its configured hardware at startup. 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 the panel continually restarts. 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 from the power supply.
2. Apply AC power to the panel and wait until the buzzer sounds.
3. Cycle the AC power five times by removing the power for 10 seconds, and then reapplying the power for 10
seconds.
After the fifth recycle, the LCD should display “Panel Service Utility ... waiting for SDU download.”
4. Using an RS-232 RJ-11 standard cable, connect the VM-CPU in the panel to the computer that has your VM-
CU project database. See “RS-232 download” on page 53.
5. Open the VM-CU project and compile the rules.
6. Run a database conversion, and then download the database to the panel.
7. Disconnect the RJ-11 connection, and then reconnect the battery wiring to the power supply.
Note: The panel will restore to normal state if there are no discrepancies between the database and installed
equipment, and all hardware is functioning correctly.
Hardware troubleshooting
PS10-4B Power Supply troubleshooting
Under most conditions, a defective power supply will be identified by the system, and annunciated as a trouble.
The system may continue to operate nearly normally, as the battery connected to the faulty supply will
automatically be switched into the circuit, as the load demands.
You can connect the panel to the PC running the VM-CU and perform a power supply diagnostics check. See the
VM-CU diagnostics help topic for details.
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