Hitachi CV-600, Service Manualv

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4. Check the operation of the switch button function by switching
on and off 3 times.
5. Check the operation of the winder function by retracting the cord
3 times.
6. Check for the presence of foreign matter, this could cause
damage to the motor.
7. The dust bag full indicator can be adjusted by attaching the
crevice nozzle (item 50) to the hose pipe. Cover the straight
(not bevelled) part of the crevice tool with a finger and slide the
indicator so that it is in the centre of the viewing aperture.
NB. The slide control on the hose pipe should be closed and the
power control should be set at maximum on CV-610 and CV-710.
CV-610/CV-710 Power Module Circuit Diagram
NB. This circuit is only shown for reference, if there is a fault on the module,
the module should be replaced.
3. Check the noise level at the motor.