Schumacher Automatic PSW-70300A - Manual (Page 13)

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PROBLEM POSSIBLE CAUSE REASON/SOLUTION
Charger makes a loud buzz
or hum.
Transformer laminations vibrate
(buzz).
Shorted Diode Assembly or
Output Rectifier Assembly (hum).
No problem; this is a normal
condition.
Have charger checked by a
qualified technician.
Short or no start cycle
when cranking engine.
Drawing more than 300 amps.
Failure to wait 3 minutes (180
seconds) between cranks.
Clips 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.
Crank time varies with the
amount of current drawn. If
cranking draws more than 300
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 reset. Make sure the charger
vents are not blocked. Wait and
try again.
On a severely discharged battery,
charge for 10 to 15 minutes in
the 40 amp manual rate to help
assist in cranking.
Charger will not turn on
when properly connected.
AC outlet is dead.
Poor electrical connection.
Check for open fuse or circuit
breaker supplying AC outlet.
Check power cord and extension
cord for loose fitting plug.
The battery is connected
and the charger is on, but
is not charging.
Clips are not making a good
connection.
Check for poor connection at
battery and frame. Make sure
connecting points are clean.
Rock clips back and forth for a
better connection.
The measured current is
much lower than what was
selected.
The charger reached the
maximum voltage and is
reducing the current.
No problem; this is a normal
condition.
BEFORE RETURNING FOR REPAIRS 17.
When a charging problem arises, make certain that the battery is capable of accepting a 17.1
normal charge. Use a good battery to double check all connections, the AC outlet for a full
120-volts, the charger clips for correct polarity and the quality of the connections from the
cables to the clips and from the clips to the battery system. The clips must be clean.
When a battery is very cold, partially charged or sulfated, it will not draw the full rated 17.2
amperes from the charger. It is both dangerous and damaging to a battery to force
higher amperage into it than it can effectively use in recharging.
When an UNKNOWN OPERATING PROBLEM arises, please read the complete manual 17.3
and call the customer service number for information. This will usually eliminate the
need for return.
If the above solutions do not eliminate the problem or for information about troubleshooting
or replacement parts, call toll-free from anywhere in the U.S.A.
1-800-621-5485
7:00 am to 5:00 pm Central Time Monday thru Friday