Schumacher Electric SC-7500Al SC-8020A Owner's Manual page 11

Troubleshooting
PROBLEM
The battery is connected
and the charger is on, but
isn't charging.
Indicator lights are lit in
an erratic manner, not
explained in this manual.
The Digital Display
always flashes before
the battery is completely
charged.
The green CHARGED
LED lights a few minutes
after connecting to the
battery.
The charger is making an
audible clicking sound.
Charger makes a loud
buzz or hum.
POSSIBLE CAUSE
The charger is in tester mode,
not charger mode.
You might have accidentally
activated a special diagnostic
mode.
The incorrect battery type may
have been selected. This will
happen if the battery did not reach
full charge within 24 hours. May
be due to a very large battery
or a bank of batteries requiring
more power than the charger
can deliver within 24 hours. The
battery may also be faulty.
The battery may be fully charged
or recently charged, leaving the
battery voltage high enough to
appear to be fully charged.
The incorrect battery type may
have been selected.
Circuit breaker is cycling.
The battery is defective.
Shorted battery cables or
clamps.
Severely discharged, but
otherwise good battery.
Reversed connections to the
battery.
Transformer laminations vibrate
(buzz).
Shorted Diode Assembly or
Output Rectifier Assembly (hum).
• 11 •
SOLUTION
Press the BATTERY SIZE
button to activate charging and
select a charge rate.
Make sure nothing is touching
the control panel, then unplug
the charger and plug it in again.
Reset the charger by briefly
unplugging it or briefly
disconnecting the negative
battery clamp. Select the
desired rate (SMALL or LARGE
BATTERY) and BATTERY
TYPE again, if necessary.
If the battery is in a vehicle,
turn the headlights on for a few
minutes, to reduce the battery
voltage; then try charging again.
Reset the charger, by briefly
unplugging it or briefly
disconnecting the negative
battery clamp. Select the
desired rate (SMALL or LARGE
BATTERY) and battery type
again, if necessary.
The settings may be wrong.
Check the charger settings.
Have the battery checked.
Circuit breaker cycles when
current draw is too high. Check
for shorted cables or clamps
and replace, if necessary.
The battery may not want to
accept a charge, due to a
run-down state. Allow charging
to continue until battery has a
chance to recover sufficiently
to take a charge. If more than
20 minutes, stop charging and
have the battery checked.
Shut the charger off and correct
the lead connections.
No problem, this is a normal
condition.
Have charger checked by a
qualified technician.