Yamaha EF4500iSE - Inverter Generator, Theory & Diagnostics Manual

Page: 58 / 218

2-24
Yamaha Generator Theory & Diagnostics Guide
5-9
GENERATOR SYSTEM
ELEC
AC coil 2 AC voltage inspection
9
Connect White-Orange (R-S), Orange-White (S-T),
and White-White (R-T) leads.
9
Start the engine, then measure the voltage. (Tester
range: AC120V)
GOOD
TOO LOW
DOES NOT GENERATE
AC coil 2
W
Or
W
W
W
W
Br
G
Br
Br
Br
Br
AC coil 1
R
S
T
R
S
T
AC coil 2 AC voltage:
13.5 ~ 23.0 V at 20 °C (68 °F)
*
Magnetic force is weak.
Replace the magneto rotor.
AC coil 2 resistance inspection
9
Stop the engine.
9
Measure the resistance between White-Orange
(R-S), Orange-White (S-T), and White-White (R-T)
leads. (Tester range:
Ω ×
1)
SPECIFICATION OUT OF SPECIFICATION
AC coil 2
W
Or
W
Br
G
Br
R
S
T
R
S
T
AC coil 1
AC coil 2 resistance:
0.17
Ω
± 20% at 20 °C (68 °F)
Replace the AC coil 2.
Replace the control unit.
Economy switch continuity inspection
9
Switch “ON”
→
Continuity
9
Switch “OFF”
→
No Continuity
CONTINUITY NO CONTINUITY
7VV10-05 02.10.8 8:11 PM Page 9
Refer to Service Data Section for Specifications
Refer to Service Data Section for Specifications