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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 .
(a) A .V .R . TROUBLE IDENTIFICATION by APPEARANCE
If an A .V .R . electronic part is burnt dark, or the surface epoxy resin melted, it often indicates
A .V .R . trouble .
(b) IDENTIFYING A .V .R . TROUBLE by CHECKING INTER-LEAD RESISTANCE
Check the inter-lead resistance of the A .V .R . with a tester, referring to the following table .
If the tester readings very greatly from the values specified in the table on next page, the
A .V .R . is faulty .
NOTE : Take tester inaccuracy into account in reading the tester.
BRUSH
- 20 -
BRUSH
HOLDER
5 mm
CIRCUIT TESTER
(Resistance)
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