Generator System; Troubleshooting Chart - Yamaha EF1000iS Service Manual

GENERATOR SYSTEM

TROUBLESHOOTING CHART

Start the engine.
Check the overload warning light.
DOES NOT TURN ON
Start the engine.
Check the pilot light.
DOES NOT TURN ON
Rated engine speed inspection.
9 Operate the engine with no load.
9 Set the economy switch to "OFF".
5,000 r/min
GOOD
AC coil 1 AC voltage inspection
9 Connect Brown-Green (R-S), Green-Brown (S-T),
and Brown-Brown (R-T) leads.
9 Start the engine, then measure the voltage. (Tester
range: AC300V)
R
AC coil 1
S
T
R
AC coil 2
S
T
AC coil 1 AC voltage:
130 ~ 260 V at 20 °C (68 °F)
GOOD
*
GENERATOR SYSTEM
WEAK OR NO AC CURRENT
TURNS ON
TURNS ON
OUT OF SPECIFICATION
W Br Br W
Or G Br W
W Br Br W
TOO LOW
DOES NOT GENERATE
Check the overload warning light.
TURNS ON
Check the pilot light.
Check the throttle control system.
Refer to "THROTTLE CONTROL SYSTEM" in
CHAPTER 6.
Magnetic force is weak.
Replace the magneto rotor.
AC coil 1 resistance inspection
9 Stop the engine.
9 Measure the resistance between Brown-Green
(R-S), Green-Brown (S-T), and Brown-Brown (R-T)
leads. (Tester range: Ω × 1)
R
AC coil 1
S
T
R
AC coil 2
S
T
AC coil 1 resistance:
0.47 Ω ± 20% at 20 °C (68 °F)
SPECIFICATION
Replace the AC coil 1.
5-8
ELEC
DOES NOT TURN ON
W Br
Or G
W Br
OUT OF SPECIFICATION