Dyson DC18 Service Manual page 8

service manual
Electrical fault diagnostic
1) When DC18 is switched on in the upright position, the brushbar motor is off. Tilting the machine
into normal vacuuming mode will automatically operate the upright switch, turning the brushbar
motor on. The brushbar motor can be switched off using the brushbar switch.
2) The vacuum motor of DC18 is fitted with a heat sensitive Thermal Cut-Out (TCO). This will shut the
motor down for up to 60 minutes if it reaches a temperature >96 degrees celcius. Excessive
temperatures within the motor are usually caused by machine/filter blockages.
3) The cleaner head is fitted with a TCO reset switch that will shut the brushbar motor off if it is put under
an excessive load (blocked/seized brushbar etc.). The cause of the shut down should be cleared and
the TCO reset by pressing the switch.
If the cause of the brushbar motor cut-out is not rectified the TCO will repeatedly reactivate, preventing
the brushbar from turning.
Electrical fault diaignosis
Note: all 'connection' numbers and 'continuity' checks refer to the illustration and table on pages 3-4.
N N o o m m a a c c h h i i n n e e p p o o w w e e r r ( ( v v a a c c m m o o t t o o r r a a n n d d b b r r u u s s h h b b a a r r m m o o t t o o r r o o f f f f ) )
1) Check for damage/electrical failure to the plug, fuse and powercord. Check the mechanical
actuation of the on/off switch.
2) Check for a loose connection at points 1 1 , 2 2 a a n n d d 5 5 . .
3) Check continuity of powercord, on/off switch and internal cable (neutral wire only).
N N o o p p o o w w e e r r t t o o t t h h e e v v a a c c m m o o t t o o r r ( ( b b r r u u s s h h b b a a r r m m o o t t o o r r o o n n i i n n t t i i l l t t p p o o s s i i t t i i o o n n ) )
1) Check connections at points 6 6 and 8 8 .
2) Check continuity of the internal cable (live wire, points 2 2 - - 6 6 and neutral wire points 7 7 - - 8 8 ).
3) Check the vac motor continuity and motor brushes, windings, commutator etc.
N N o o p p o o w w e e r r t t o o t t h h e e b b r r u u s s h h b b a a r r m m o o t t o o r r ( ( v v a a c c m m o o t t o o r r o o n n ) )
1) Check connections at points 3 3 , , 4 4 , , 9 9 , , 1 1 0 0 , , 1 1 1 1 , , 1 1 2 2 , , 1 1 3 3 , , 1 1 4 4 , , 1 1 5 5 , , 1 1 8 8 , , 1 1 9 9 , , 2 2 0 0 a a n n d d 2 2 2 2 .
2) Check the continuity of the brushbar switch, the internal cable (red wire only), the micro switch
loom, the cleaner head coiled cable loom assembly, the cleaner head connector block assembly and
the PCB assembly, points 2 2 0 0 - - 2 2 1 1 only.
3) Check the brushbar motor continuity and motor brushes, windings, commutator etc.
B B r r u u s s h h b b a a r r m m o o t t o o r r o o n n i i n n u u p p r r i i g g h h t t p p o o s s i i t t i i o o n n ( ( s s w w i i t t c c h h e e s s o o f f f f w w i i t t h h b b r r u u s s h h b b a a r r s s w w i i t t c c h h ) )
1) Check the actuation of the micro switch. Ensure the micro switch isn't jamming or sticking.
B B r r u u s s h h b b a a r r s s w w i i t t c c h h d d o o e e s s n n o o t t s s w w i i t t c c h h b b r r u u s s h h b b a a r r m m o o t t o o r r o o f f f f i i n n t t i i l l t t p p o o s s i i t t i i o o n n
1) Check for correct location of the brushbar reset arm (see item 74, page 19).
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Issued 10/06