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Section V – Maintenance and Servicing
Symptom:
AVM-2000 operates with the AC Power Module connected, but not properly on the internal
rechargeable battery.
Internal rechargeable battery needs to be charged.
Action: Charge battery as described.
There is a problem with the battery charging circuit.
Action: Check the voltage across the battery terminals (the voltage should be between 6.0 and 7.5 volts
DC when the AC Power Module is connected—i.e. when the battery is charging). A lower voltage indicates
a failed Power Supply Subsystem, a failed rechargeable battery or a deeply discharged battery (allow
sufficient time to charge the battery).
Disconnect the battery and measure its open circuit voltage. If the open circuit battery voltage lies
between 5.3 and 7.0 volts, the Power Supply Subsystem is defective.
Action: Replace the Power Supply Subsystem.
If the open circuit battery voltage is substantially below 5.3 volts, the battery has one or more shorted
cells. Action: Replace the battery.
Symptom:
AVM-2000 internal rechargeable battery charges, but the level displayed on the AVM-2000
LCD does not show the normal fully charged reading.
Disconnect the battery and measure its open circuit voltage. If the open circuit battery voltage lies
between 5.3 and 7.0 volts, the Front Panel Subsystem battery monitoring circuit is defective.
Action: Replace the Front Panel Subsystem.
If the open circuit battery voltage is substantially below 5.3 volts, the battery has one or more shorted
cells.
Action: Replace the battery.
