Nilfisk-Advance 56206980 Service Manual page 15

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BATTERY CHARGER SERVICE MANUAL
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7-CHARGER DC CIRCUIT TEST
Disconnect the AC power cord and the DC charger plug.
A Set multimeter to low resistance scale (R X 1) or use a low voltage continuity tester.
B Connect one lead of the ohmmeter or continuity tester to one of the DC charging plug contacts, and the
other to the remaining DC plug contacts and note the response. Reverse the test leads and note the
response again. The circuit should be complete in one direction only (Fig. 7 & 8).
FIGURE 7. Test charger DC circuit. The
circuit conducts in one direction.
Note: When using a very sensitive ohmmeter, disconnect the control cable assembly edge connector from the
electronic timer kit.
C If the circuit does not conduct in either direction and the fuses or fuse assembly test good, individually
check the continuity of the DC output cord, ammeter, diodes and all connections.
D If the circuit conducts in both directions, a "short" exists in the charger DC circuit. First check the DC
output cord for a "short" between the two wires. Second, check if one or more of the diodes has failed in
the shorted mode.
14 - FORM NO. 56041170 / BATTERY CHARGER SERVICE MANUAL / PARTS LIST
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FIGURE 8. Test charger DC circuit. The
circuit does not conduct in reverse
direction.