Service; Performing Routine Maintenance; Troubleshooting Procedure - La Marche MSM 10-12V Installation And Operation Manual

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Service

All work inside the MSM should be performed by a qualified electrician. La Marche is not responsible for any
damages caused by an unqualified technician.
Before working inside the MSM ensure that the AC Power is off at the main breaker box. Disconnect
the battery from the charger via the battery disconnect breaker or manually disconnecting the battery
cables. Verify that no voltage is present by using a voltmeter at all input and output terminals.
4.1

Performing Routine Maintenance

Although very little maintenance is required with the MSM charger, 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 charger.
2. Make sure all connections are tight. (make sure the unit is de-energized)
3. Check front panel meters and LEDs for accuracy.
4.2

Troubleshooting Procedure

Troubleshooting should be performed only by trained service personnel or experienced electricians. Be fore
setting up any complicated testing, give the unit a general inspection.
Check the following:
1. Check DC output cables, connections, battery type, and number of cells against the unit's rating.
2. Check unit specifications against customer order.
3. Check input connections, input voltage and feeder breaker/fuse
4. Check any internal wiring, fuses, and breakers.
5. Check for shipping damage, loose connections, broken wires, etc.
6. Certain failures can be caused by defective batteries; make sure batteries are free from defects.
When calling in for a service inquiry or for troubleshooting assistance, be sure to have all of the following
information on hand:
1. Equipment model number and serial number.
2. The actual AC input voltage.
3. The DC output voltage with and without the battery.
4. Result of the check of the AC and DC fuses/ breakers.
5. The actual DC output current and voltage, measured with battery and load connected to charger.
NOTE: When ordering replacement parts, drawings, or schematics, always give model number and serial
number.
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