Schumacher PSW-70300A Problem Possible Cause REASON/SOLUTION, Before Returning for Repairs

PROBLEM	POSSIBLE CAUSE	REASON/SOLUTION
Charger makes a loud buzz	Transformer laminations vibrate	No problem; this is a normal
or hum.	(buzz).	condition.
	Shorted Diode Assembly or	Have charger checked by a
	Output Rectifier Assembly (hum).	qualified technician.
Short or no start cycle	Drawing more than 300 amps.	Crank time varies with the
when cranking engine.		amount of current drawn. If
		cranking draws more than 300
		amps, crank time may be less
		than 3 seconds.
	Failure to wait 3 minutes (180	Wait 3 minutes of rest time
	seconds) between cranks.	before the next crank.
	Clips are not making a good	Check for poor connection at
	connection.	battery and frame.
	AC cord and/or extension cord	Check power cord and extension
	is loose.	cord for loose fitting plug.
	No power at receptacle.	Check for open fuse or circuit
		breaker supplying AC outlet.
	The charger may be overheated.	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.
	Battery may be severely	On a severely discharged battery,
	discharged.	charge for 10 to 15 minutes in
		the 40 amp manual rate to help
		assist in cranking.
Charger will not turn on	AC outlet is dead.	Check for open fuse or circuit
when properly connected.		breaker supplying AC outlet.
	Poor electrical connection.	Check power cord and extension
		cord for loose fitting plug.
The battery is connected	Clips are not making a good	Check for poor connection at
and the charger is on, but	connection.	battery and frame. Make sure
is not charging.		connecting points are clean.
		Rock clips back and forth for a
		better connection.
The measured current is	The charger reached the	No problem; this is a normal
much lower than what was	maximum voltage and is	condition.
selected.	reducing the current.

17.BEFORE RETURNING FOR REPAIRS

17.1When a charging problem arises, make certain that the battery is capable of accepting a 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.

17.2When a battery is very cold, partially charged or sulfated, it will not draw the full rated 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.

17.3When an UNKNOWN OPERATING PROBLEM arises, please read the complete manual 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

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