1.4. Testing the PCB
• Check that the fuse on the PCB is not burnt out. You can also mea-
sure the fuse with a multimeter to determine the resistance of the
fuse.
•• If the fuse is serviceable (a resistance is present): change the
PCB
» see step 4.7.
•• If the fuse is unserviceable (no resistance is present): replace the
fuse and check that the device functions. If the device does not
function, change the PCB.
» see step 4.7.
1.5. Checking the fuse in the charging
circuit
• Remove the top cover.
» see step 4.2.
• Check that the fuse in the charging circuit (on the motor) is not
burnt out. You can also measure the fuse with a multimeter to deter-
mine the resistance of the fuse.
•• If the fuse is serviceable (a resistance is present):
» go to step 1.6.
•• If the fuse is unserviceable (no resistance is present): change the
fuse
» go to step 1.6.
1.6. Checking the charger and the
charging cycle
Connect the charger to the mains and check the output v the
LED indicator on the charger.
• If the LED is illuminated green and the output voltage is higher than
27.5 V DC
» Check the following point.
Connect the charger to the device and check the output v the
LED indicator on the charger.
• If the LED illuminates orange and there is an output voltage of 29.5
V DC
» The charger is OK.
CAUTION:
WHEN THE BATTERIES ARE CHARGED THE LED
CHANGES BACK TO ILLUMINATED GREEN.
• If neither occurs
» Change the charger.
• Refit the top cover if it was removed.
» see step 4.3.
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