Yamaha XS650SE, Shop Manual

Page: 56 / 215

6-2. CHARGING SYSTEM
A.Charging circuit diagram
L
Rectifier 4. Load 9.
coil
2. Fuse 6. Voltage regulator
Relay unit
3. Main switch 7. A.C. Generator
4.
8. Field
B. A.C.Generator
1. Checking method.
a. Connect D.C. voltmeter to the battery
terminals. Battery should be fully charged.
b. Start engine.
c. Accelerate engine to approximately 2,000
rpm or more and check generated voltage.
Generated voltage:
14.5 0.5 v
d. If the indicated voltage cannot be reach-
ed, then perform the tests in step 2.
NOTE:
Never disconnect wires from the battery
while the generator is in operation. If the
battery is disconnected, the voltage across
the generator terminals will increase,
damaging the diodes.
2. Resistance test of field coil and statorcoil.
Check the resistance between terminals. If
resistance is out of specification, coil is
broken. Check the coil connections. If the
coil connections are good, then the coil is
broken inside and it should be replaced.
Field coil resistance:
(Green-Black)
10% at 20°C
coil resistance:
1
10% at 20°C
coil 4 . Black
2. White 5. Sky blue
3. Yellow 6. Field
C. Voltage regulator
The regulator’s function is to pass a control-
led amount of current through the field
windings which creates a magnetic field that
produces a charging voltage in the three stator
windings.
1. When adjusting the regulator, a D.C.
voltmeter, ammeter, and tachometer are
necessary. They are connected as illustrat-
ed, and adjustment should be made in the
following sequence:
L
A . Ammeter 1 Rectifier 4. AC. Generator
V . Voltmeter 2. Battery 6. Field coil
3. regulator 6. coil
a. Remove the regulator from the frame, and
check the contact points. If the point
surfaces are rough, they should be
smoothed with sand paper (#500 or
#600). After sandpapering, throughly
clean contact points with contact point
cleaner.
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