18
5.3
Troubleshooting Chart
Isolate from all power sources prior to performing any interior verifications or part replacements.
Symptom
Possible Cause
Action
1
AC Protection Opens
Immediately
(High Input Current)
Incorrect AC Input Voltage
Measure AC voltage and verify against
charger nameplate.
AC Input Taps on Power Transformer are
Incorrectly Set
Verify tap settings using charger
schematic or input table found on
charger.
Incorrect, Damaged, or Loose Cable/Harness
Connections
Visually inspect and verify all internal
wiring using charger schematic.
DC Output Too High
Refer to Symptom 6.
Defective Diode Heat Sink Assembly
Refer to Appendix D.
2
DC Protection Opens
Immediately
(High Output Current)
Incorrect Battery Connected
Measure battery voltage and verify
against charger nameplate.
Reverse Polarity
Confirm polarity of DC cables with
voltmeter.
Incorrect, Damaged, or Loose Cable/Harness
Connections
Visually inspect and verify all internal
wiring using charger schematic.
Shorted Output Cables
Inspect DC cables for shorts
Shorted Battery Cells or Customer Equipment
Remove all loads and batteries from
charger and confirm charger functionality.
3
No Display and No LEDs
(If Applicable)
No AC Voltage Applied to Charger
Measure and confirm input voltage.
Charger AC protection is open
Refer to Symptom 1.
Incorrect, Damaged or Loose Cable/Harness
Connections
Visually inspect and verify all internal
wiring using charger schematic.
Defective LEDs/Display Card
Contact La Marche Service Department
for further troubleshooting instructions.
4
Meter Reading Incorrect
Voltage or Current
Incorrect, Damaged or Loose Cable/Harness
Connections
Visually inspect and verify all internal
wiring using charger schematic.
Defective Analog Voltmeter
(if applicable)
Measure DC voltage across the voltmeter
and verify meter is displaying correct
voltage.
Defective Analog Ammeter
(if applicable)
Measure current output with clamp
ammeter. Verify meter is displaying
correct current.
Incorrect Display Calibration on Display Card
(if applicable)
Measure output voltage and current;
compare to display readings. Refer to
“Display Calibration” section of the
corresponding option manual.
Incorrect Software Settings on Display Card
(if applicable)
Contact La Marche Service Department
for further troubleshooting instructions.
Defective Shunt (if applicable)
Defective Control Card
5
Low Output Voltage
or Current
No AC Input Voltage Applied to Charger
Measure and confirm input voltage.
Incorrect Battery Connected
Measure battery voltage and verify
against charger nameplate.
Incorrect, Damaged or Loose Cable/Harness
Connections
Visually inspect and verify all internal
wiring using charger schematic.
