Schumacher Automatic SEM-1562A - Manual (Page 14)

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If the charger is moved around the shop or transported to 15.4
another location, take care to avoid/prevent damage to the
cords, clips and charger. Failure to do so could result in personal
injury or property damage.
TROUBLESHOOTiNG
16.
PROBLEM POSSiBLE CAUSE REASON/SOLUTiON
Charger
will not turn
on when
properly
connected.
AC outlet is dead
Poor electrical
connection.
Severely discharged,
but otherwise good,
battery.
Clips are not making a
good connection to the
battery.
Battery is defective.
Reverse connections
at battery.
Check for an open fuse or
circuit breaker supplying the
AC outlet.
Check the power cord and
extension cord for as loose
fitting plug.
The battery may not want
to accept a charge due to
a run-down state. Allow the
charging to continue until the
battery has had a chance to
recover sufficiently enough to
take a charge. If more than 20
minutes, stop charging and
have the battery checked
.
Check for poor connection to
battery and frame. Make sure
connection points are clean.
Rock clips back and forth for a
better connection
.
Check the battery.
Unplug the charger and
correct the lead connections
.
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.