16
5.0
Service
All work inside the A12B charger should be performed by qualified personnel. La Marche is not responsible for
any damages caused by an unqualified technician.
Before working inside the A12B, ensure the AC power is off at the main breaker box and the battery has
been removed from the charger’s DC output terminals, either by removing the battery cables or exercising
the battery disconnect. Verify that no voltage is present by using a voltmeter at all input and output
terminals.
5.1
Preventive Maintenance Procedure
Although minimal maintenance is required with La Marche chargers, routine checks and adjustments are
recommended to ensure optimum system performance.
Yearly
1. Confirm air vents are open. Remove dust and debris from interior of unit.
2. Verify all connections are tight.
3. Perform a visual inspection on all internal components.
4. Check front panel meters for accuracy and LED operation.
5. Measure the output ripple.
-
Without interrupting a live system, measure ripple at the output terminals of the charger with a True-
RMS multimeter in the AC-Voltage setting. If the ripple reading is higher than the specified value in the
table below, the capacitors are recommended to be replaced.
Charger Nominal Output
Battery Eliminator AC Ripple
Limit
12VDC – 48VDC
30mV RMS
130VDC
100mV RMS
240VDC
200mV RMS
7th Year
1. If the charger is consistently operated in higher temperature environments, all capacitors are recommended
to be replaced.
10th Year
1. Check magnetics, components and wiring for signs of excessive heat.
2. It is recommended to replace all capacitors if not done so at the 7 year interval.
