8-6 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 15
mm (0.2 ” to 0.6”).
A brush shorter than 5 mm must be replaced
because decreased contact pressure
between the brush and slip ring lowers gen-
erator efficiency and output voltage.
8-7 A.V.R
(AUTOMATIC VOLTAGE REGULATOR)
1) Features
This AVR operates to control the field current
in order to maintain the ouput voltage for the
AC current, which generated by the magnetic
flux by the field coil.
0
2) Distinguish the Good and Bad Parts
For making a simple Good (G) / No-Good
(NG) judgement, refer to the following table
showing continuity test criteria when mea-
sured between lead wires using a circuit
tester.
(O&Y0 0.2")
\
t
- BRUSH
Circuit tester (with measuring range of more than 1 M Q When measuring continuity, set the cir-
cuit tester to the range reading a high resistance (1 M Q).
* Checking table for analogue circuit tester.
Analogue circuit tester
Apply black 0 needle of the circuit tester
Yellow
Red
White
Light green
Brown/Yellow
Yellow
03 03 co 03
Apply red @
Red
co
100kQ
co
200kQ
needle of
the circuit
White
33
50kR
03
100kQ
tester
-Light green
16
kB
220kQ
125
kQ
14kQ
BrownlYellow
xl
185kQ 100 k!2
co
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