Kohler 27EFOZ, Service Manual

Page: 37 / 80

TP-5936 7/04 25 Section 6 Controller Troubleshooting
Is there AC output
when the start button
is HELD and the unit
is running?
Is AC output at the
correct voltage, e.g.
120 volts AC?
Yes
Test the voltage
regulator Refer to
Section 7
No
Replace the
controller
circuit
board
Yes
Is there 12VAC output at the
B1/B2 stator winding?
No
Yes
Is there 12VDC at
the exciter field?
Yes
Test the
stator
and main
field
No
No
Separately excite the
generator set to
determine if other
components are
inoperative.
Replace the
controller
circuit
board
Yes
No
Is AC output voltage at
spec (See Section 7,
Separate Excitation)?
Test the stator,
main field (rotor), and
exciter/armature.
Refer to Section 7
Is the voltage
regulator
fuse okay?
Yes
Replace the fuse
No
(OPTIONAL)
Go to B at the beginning
of the preceding page
C
Test the voltage
regulator. Refer to
Section 7
Figure 6-6 Troubleshooting Relay Controller Circuit Board (4 of 4)