Checking The Charge Coil; Checking The Power Bobbin; Checking The Lighting Coil - Yamaha F25C Service Manual

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ELEC

Checking the charge coil

1. Measure the charge coil output peak volt-
age. Replace the stator coil if below
specification.
Digital circuit tester: 90890-03174
Peak voltage adapter B:
90890-03172
Charge coil output peak voltage:
Green/white (G/W) –
White/green (W/G)
Unloaded
r/min
Cranking
DC V 170 130
Charge coil resistance
(reference data):
Green/white (G/W) –
White/green (W/G)
660–710 Ω at 20 °C (68 °F)

Checking the power bobbin

1. Measure the power bobbin output peak
voltage. Replace the stator coil if below
specification.
8-9
Electrical systems
Loaded
1,500 3,500
140 140
Digital circuit tester: 90890-03174
Peak voltage adapter B:
90890-03172
Power bobbin output peak voltage:
Yellow/black (Y/B) –
Yellow/black (Y/B)
r/min
Cranking
DC V 10.0
r/min
Cranking
DC V 5.5
Power bobbin resistance
(reference data):
Yellow/black (Y/B) –
Yellow/black (Y/B)
6.50–7.20 Ω at 20 °C (68 °F)

Checking the lighting coil

1. Measure the lighting coil output peak
voltage. Replace the stator coil if below
specification.
Digital circuit tester: 90890-03174
Peak voltage adapter B:
90890-03172
Lighting coil output peak voltage:
Yellow (Y) – Yellow (Y)
r/min
Cranking
DC V 9.4
Unloaded
1,500 3,500
38.9 80.0
Loaded
1,500 3,500
30.0 80.0
Unloaded
1,500 3,500
46.0 95.0
6D55F11