Generator System; Troubleshooting Chart - Yamaha EF3000iSE 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 subcoil coupler 1.
Connect the Blue leads, and then connect the Orange
leads.
L
L
O
1 O
Disconnect the main coil coupler.
Start the engine.
Connect the tip of the probe of pocket tester to the Yel-
low leads.
Measure the voltage. (Tester range: AC 300 V)
Y
Y Y
Main coil AC voltage:
200 ~ 250 V (120 V-60 Hz)
380 ~ 470 V
(220 V-50 Hz, 230 V-50 Hz)
GOOD
*
GENERATOR SYSTEM
WEAK OR NO AC CURRENT
TURNS ON
DOES NOT TURN ON
".
OUT OF SPECIFICATION
L O O L
L O O L
SWL4150
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 generator assembly.
Main coil resistance measurement
Stop the engine.
Measure the resistance between the Yellow leads.
(Tester range: Ω × 1)
Main coil resistance:
0.79 Ω ± 20% at 20 °C (68 °F)
(120 V-60 Hz)
2.46 ± 20% at 20 °C (68 °F)
(220 V-50 Hz, 230 V-50 Hz)
GOOD
Replace the generator assembly.
4-20
– +
ELEC
DOES NOT TURN ON
Y
Y Y
SVU4170
DISCONNECTED/
SHORT CIRCUIT