Subaru Robin SGX3500 - Manual (Page 22)

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2) Cleaning Slip rings
The slip ring surfaces must be uniformly
bright. Slip rings showing black spots,
excessive wear, or uneven wear must be
repaired. A stained slip ring lowers generator
efficiency and output voltage. Polish the
slip rings with fine sandpaper while turning
the rotor until rough spots disappear. Care
should be taken not to touch the rotor coils
with the sandpaper.
6-5 BRUSH
The brushes must be smooth where they
contact the slip rings. If not, polish smooth the
brushes with sandpaper. A brush that is not
smooth produces arcs between the brush and
slip ring leading to possible damage. Usable
brush lengths are from 5 mm to 11 mm (0.20 "
to 0.43").
A brush shorter than 5 mm must be replaced
because decreased contact pressure between
the brush and slip ring lowers generator
efficiency and output voltage.
6-6 A.V.R. .
(AUTOMATIC VOLTAGE REGULATOR)
1) Features
This A.V.R. operates to control the field
current in order to maintain the output
voltage for the AC current, which generated
by the magnetic flux by the field coil.
2) A.V.R. trouble may be identified by simply
looking at the A.V.R., or by the inter-lead
resistance with a tester, or actually mounting
it in the generator and operating it.