Honda Acura NSX 1991 Service Manual page 1071

5 . Check for continuity between each segment of the
commutator. If an open circuit exists between any
segment, replace the armature.
6. Place the armature on an armature tester. Hold a
hacksaw blade on the armature core.
ARMATURE TESTER
HACKSAW BLADE
ARMATURE
If the blade is attracted to the core or vibrates while
core is turned, the armature is shorted. Replace the
armature.
7 .
COMMUTATOR
SEGMENT
I
With an ohmmeter, check that no continuity exists
between the commutator and armature coil core,
and between the commutator and armature shaft.
If continuity exists, replace the armature.
SHAFT
COIL-CORE