Generator System; Troubleshooting Chart - Yamaha EF2800i Service Manual

GENERATOR SYSTEM

TROUBLESHOOTING CHART

Start the engine.
Check the overload warning light.
DOES NOT TURN ON
Start the engine.
Check the AC output indicator.
TURNS ON
Rated engine speed inspection
Operate the engine with no load.
Set the economy switch to "OFF".
3,550 r/min
GOOD
Main coil AC voltage inspection
Disconnect the sub coil coupler 1.
Connect the Red and Green/Yellow leads, and then
connect the Orange leads.
1
Or
G/Y
Or
G/Y
R
R
Disconnect the main coil coupler.
Start the engine.
Connect the pocket tester to the Yellow leads.
Measure the voltage. (Tester range: AC 300 V)
Y
Y Y
Main coil AC voltage:
160 ~ 200 V
GOOD
*
GENERATOR SYSTEM
WEAK OR NO AC CURRENT
TURNS ON
DOES NOT TURN ON
OUT OF SPECIFICATION
Or Or G/Y
Or Or R
SVU4150
Y
Y Y
SVU4160
TOO LOW
DOES NOT GENERATE
Disconnect the overloaded electric device.
TURNS ON
Replace the AC output indicator.
Check the throttle control system.
Refer to "THROTTLE CONTROL SYSTEM" in CHAP-
TER 3.
Magnetic force is weak.
Replace the magneto rotor.
Main coil resistance measurement
Stop the engine.
Measure the resistance between the Yellow leads.
(Tester range: Ω × 1)
Main coil resistance:
0.6 Ω ± 20 % at 20°C (68°F)
GOOD
Replace the stator assembly.
4-9
– +
ELEC
DOES NOT TURN ON
Y
Y Y
SVU4170
DISCONNECTED/
SHORT CIRCUIT