Yamaha EF4500iSE Theory & Diagnostics Manual page 60

Yamaha Generator Theory & Diagnostics Guide
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Sub coil AC voltage inspection
9 Connect the White leads of the sub coil 1.
9 Start the engine, then measure the voltage. (Tester
range: AC120V)
W W Or
W W Or L
1
Sub coil AC voltage:
Refer to Service Data Section for Specifications
13.0 ~ 18.0 V at 20 °C (68 °F)
GOOD
Replace the control unit.
L
TOO LOW
DOES NOT GENERATE
GENERATOR SYSTEM
Magnetic force is weak.
Replace the magneto rotor.
Sub coil resistance inspection
9 Stop the engine.
9 Measure the resistance between the-White
Orange leads. (Tester range: Ω × 1)
W
W
1
Sub coil resistance:
Refer to Service Data Section for Specifications 0.19 Ω ± 20% at 20 °C (68 °F)
SPECIFICATION
Replace the stator coil assembly.
2-26
5-9
ELEC
W
W
OUT OF SPECIFICATION