Yamaha EF3000iSE - Inverter Generator - 3000 Maximum AC..., Service Manual, Page: 255 / 327

4-22
– +
ELEC
GENERATOR SYSTEM
WEAK OR NO DC CURRENT
DC circuit breaker inspection
Check the DC circuit breaker for continuity with the DC
circuit breaker set to
“ RESET ” “ ” .
CONTINUITY NO CONTINUITY Replace the DC circuit breaker.
Start the engine.
Check the AC output indicator.
TURNS ON DOES NOT TURN ON
Replace the AC output indicator.
Rated engine speed inspection
Operate the engine with no load.
Set the economy switch to
“ OFF ” “ ” .
3,550 r/min
GOOD OUT OF SPECIFICATION
Check the throttle control system.
Refer to
“ THROTTLE CONTROL SYSTEM ” in CHAP-
TER 3.
Subcoil AC voltage inspection
Disconnect the subcoil coupler
1
.
Connect the Blue leads, and then connect the Orange
leads.
Start the engine.
Connect the tip of the probe of pocket tester to the Blue
leads.
Measure the voltage. (Tester range: AC 120 V)
Subcoil AC voltage:
13.5 ~ 23.0 V
GOOD
TOO LOW
DOES NOT GENERATE
L
L
O
O
L
L
L
L
O
O
O
O
1
SWL4200
L
L
L
L
O
O
O
O
L
L
O
O
SWL4210
*
Magnetic force is weak.
Replace the generator assembly.
Subcoil resistance measurement
Stop the engine.
Measure the resistance between the Blue leads.
(Tester range:
Ω
× 1)
Subcoil resistance:
0.07
Ω
± 20% at 20 °C (68 °F)
GOOD
DISCONNECTED/
SHORT CIRCUIT
Replace the generator assembly.
L
L
O
L
L
O
O
O
SWL4220