Charging System - Yamaha GT1 Service Manual

ELECTRICAL SYSTEM -
Condenser . Charging System
Note: After this measurement, the condenser should
be discharged by connecting the positive and
negative sides with a thick wire.
Capacity tests can be performed by simply setting the
tester to the condenser capacity. The tester should be
connected with the condenser in the same way as in
the case of the insulation resistance test. Before this
measurement, be sure to set the tester correctly.
If the reading is within 0.30 µF± 10%, the condenser
capacity is correct.
6-8. Charging System
The charging system consists of the flywheel magneto
(charging and lighting coils), rectifier, and battery.
1 . Flywheel Magneto
As the flywheel rotates, an alternating current is
generated in the charging and, lighting coils and
converted to a half-wave current by means of a
silicon rectifier.
This half-wave current charges the battery.
Charging Capacity (Daytime)
Green Lead: Charging begins at 2,000 rpm
4.0A or less at 8,000 rpm
Charging Capacity (Night time)
Green/Red: Charging_begins at 2,000 rpm
1.5±0.3A or less at 8,000 rpm
Lighting Capacity (Night time)
(With normal loads and normal wiring)
5.7V or more at 2,500 rpm
8.0V or less at 8,000 rpm
*
The charging and lighting capacity is obtained
when the battery is fully charged. If the battery
is in a low state of charge and low in voltage,
the charging rate will
not
be exactly the same as
above. However, it is desirable that the figures are
as close as possible.
Silicon rectifier
SW
W h i t e ~
o 0
Red
Red
Flywheel magneto
Fig, 6-8-1
-64-
2. Silicon ,Rectifier
The alternating current, which is generated by the
flywheel magneto, is rectified and charged to the
battery, For this rectification, a single-phase half-
wave silicon rectifier is employed.
Characteristics: Rated output - 4A,
Rated peak inverse voltage - 400V
Polarity:
0
,_ _ _ _ _ W_h_it_e _
___.C>.,.
1
_ _ R_,ee,d _ _ _ _ _ -O
Input side Output side
Fig. 6-8-2
a. Checking the Silicon Rectifier
For measurements, an ohmmeter can be used.
Silicon Rectifier
(Set the tester on Resistance.)
Fig. 6-8-3
Checking with
normal connection
Checking with Normal Connection
Connect the tester's red lead (+) to 1he silicon
rectifier's red terminal, and connect the tester's black
lead (-) to the rectifier's white terminal.
Standard value: 9
-10S1
If the tester's pointer will not swing
back over from the scale, the rec-
tifier is defective.
Checking with Reversal Connection
Connect the tester the other way around.
Standard value: If the pointer will not swing, the
rectifier is in good condition. If
the pointer swings, the rectifier is
faulty.