Schumacher Electric SC-10030A Owner's Manual page 18

PROBLEM
Charger makes a loud buzz
or hum.
Short or no start cycle when
cranking engine.
Charger will not turn on
when properly connected.
The battery is connected
and the charger is on, but is
not charging.
Battery clips do not spark
when touched together.
POSSIBLE CAUSE
Transformer laminations
vibrate (buzz).
Shorted Diode Assembly or
Output Rectifier Assembly
(hum).
Drawing more than 100
amps.
Failure to wait 3 minutes
(180 seconds) between
cranks.
Clamps are not making a
good connection.
AC cord and/or extension
cord is loose.
No power at receptacle.
The charger may be
overheated.
Battery may be severely
discharged.
AC outlet is dead.
Poor electrical connection.
Clamps are not making a
good connection.
The charger is equipped
with an auto-start feature. It
will not supply current to the
battery clips until a battery
is properly connected.
Unlike traditional chargers,
the clips will not spark if
touched together.
14
• •
SOLUTION
No problem, this is a normal
condition.
Have charger checked by a
qualified technician.
Crank time varies with the
amount of current drawn. If
cranking draws more than
100 amps, crank time may
be less than 3 seconds.
Wait 3 minutes of rest time
before the next crank.
Check for poor connection
at battery and frame.
Check power cord and
extension cord for loose
fitting plug.
Check for open fuse or
circuit breaker supplying AC
outlet.
The thermal protector may
have tripped and needs a
little longer to close. Make
sure the charger vents are
not blocked. Wait and try
again.
On a severely discharged
battery, charge for 10 to
LARGE
15 minutes at the
BATTERY
rate to help
assist in cranking.
Check for open fuse or
circuit breaker supplying AC
outlet.
Check power cord and
extension cord for loose
fitting plug.
Check for poor connection
at battery and frame. Make
sure connecting points
are clean. Rock clamps
back and forth for a better
connection.
No problem, this is a normal
condition.