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6-TEST FUSES AND DIODES
Disconnect the AC power cord and the charging cord.
A
Set the multimeter to the low resistance scale (R X 1 ) or use a low voltage continuity test light.
B
Excessive heat due to a loose, corroded or distressed connection can cause one or both fuse assembly
links to melt and open. Fuseholders that are worn, corroded, bent or broken can result in an open circuit
even when a good fuse is installed. Isolate the fuseholder assembly electrically and test for continuity
with a good fuse installed.
C
Electrically test and visually check the fuses and fuse assembly for continuity. A single blown fuse or
fuse link is normally caused by a short circuit failure of a single diode. When both fuses or fuse links are
blown, this is usually due to a reverse polarity connection to the batteries. Test the diodes and correct
the problem before replacing the fuse.
DANGER!
Replace the fuse or fuse assembly only with the correct fuse or fuse assembly. FIRE, PROPERTY
DAMAGE AND PERSONAL INJURY CAN RESULT IF THE CHARGER IS USED WITH AN INCORRECT
FUSE INSTALLED.
D
To test the diodes, disconnect one transformer secondary coil lead (TAN SLEEVING) from the diode
terminal. Using the multimeter or a low voltage continuity tester, connect one lead to the diode heatsink
plate or terminal, and the other lead to a diode terminal (Fig. 6). Note the response and then reverse the
tester leads and check each diode again.
•
GOOD DIODE: When the diode shows
continuity in one direction but not the other.
•
SHORTED DIODE: When the diode shows
continuity in both directions.
•
OPEN DIODE: When the diode does not
show continuity in either direction.
E
If the diode(s) is OPEN or SHORTED the
complete heatsink assembly with diode(s)
must be replaced.
For new, refurbished and used cleaning equipment and supplies visit www.southeasternequipment.net
BATTERY CHARGER SERVICE MANUAL
FORM NO. 56041170 / BATTERY CHARGER SERVICE MANUAL / PARTS LIST - 13
FIGURE 6. Test diodes.
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