Yamaha BR250F Service Manual page 77

Inspection
1. Check the battery voltage.
Set the left and right switches to
"VOLT" and Jl12V". If the checker
needle reads 20 volts or more, battery
voltage is sufficient.
611
[]::J
1211
REG
@
REGULATOR
©
C HECKER
(f)
Light
YAMAHA
0
6\/
[]::J
12\/
~
REG IIOLT
~
ElI]
~
e
REGULATOR CHECKER
(f)
Replace the regulator
2. Check the tester.
Set the right switch to JlREG." If the
lamp lights up, there is continuity in the
tester. Proceed with the tester.
3. Test the regulator
Slowly turn the tester knob clockwise;
the needle will move with the knob. If
the needle quickly returns to zero the
moment it enters the black area on the
scale, then the working voltage of the
thyristor is good; the voltage regulator
is working properly.
If the needle swings into the black area
of the scale but will not return to zero,
the regulator is faulty and should be
replaced.
Thyristor working voltage:
13.8
±
0.5 volts at 5,000 r/min
light is out
YAMAHA
0
611
OB
1211
~
REG
f[)
\/OLT
@
e
REGULATOR CHECKER
(£l
Regulator is good
6-8