Service Manual

SERVICE INSTRUCTIONS
3.3 CHECK MOTOR BRUSHES (fig. 3.3)
Using
a scribe or other sharp object,
carefully push the brush into
its holder
away from the commutator. When re-
leased the brush should spring back into
position against the commutator. Excess-
ively worn motor brushes will not make
proper contact with the commutator.
Motor brushes
are not replaceable.
Figure 3.3
3.31 REPLACE MOTOR OR TRIMMER
Refer to section 2.1 1 for motor replace-
ment, or replace the trimmer
if in warranty.
3.4 CHECK MOTOR BRUSH SPRINGS (fig. 3.4)
During shipment the motor brush spring
may have been jarred out of position,
causing no brush to armature contact
and disabling the motor.
Figure 3.4
3.41 SECURE SPRING/ REPLACE MOTOR OR
TRIMMER
(fig. 3.41)
Lifting the brush spring back into position,
restore brush to armature contact.
In some
cases the spring may be missing; replace
motor or, trimmer
if in warranty.
Figure 3.41
3.5 TEST BRIDGE RECTIFIER (fig. 3.5a, 3.5b)
The readings obtained during the following
test will vary depending on the test equip-
ment and settings used.
Select any two
adjacent terminals on the rectifier (all
combinations will be tested), connect
the tester to them and note the reading.
Reverse the leads. Again, note the reading.
Continue this
test process until all the
terminals have been checked (4
tests). If
after any test the 1st reading equals the
2nd reading, the rectifier
is faulty and
must be replaced.
Figure 3.5a
17