TP-5737 5/0158 Section 7 Component Testing and Adjustment
No output voltage is
detected
Is the safeguard circuit
breaker in the ON position?
Do a flashlight test on the
photo transistor board. (See
Section 7.3, LED Circuit Board
Test)
Place the safeguard circuit
breaker to the ON position
If no voltage is detected,
remove the G and F+ (red)
leads from the SCR assembly.
Jumper G and AC on the SCR
assembly.
If high voltage is detected,
check for battery voltage at
the voltage regulator. Is
battery voltage present?
Check DC voltage at the
LED circuit board
If high voltage is
detected, replace the
photo transistor board
If no voltage is detected,
test the rotor. Do the
exciter armature and
main field windings
check out okay?
If no DC voltage is present,
unplug the connector at the
LED circuit board and check
voltage
If DC voltage of
6--12 volts is
present, replace the
LED circuit board.
(LED is open)
Replace the rotor Replace the SCR
assembly
If DC voltage of 6--12 volts
is present, replace the
LED circuit board. (LED
or flyback diode is shorted
and/or grounded)
If no DC voltage is present,
check the wiring between
the voltage regulator and
the LED circuit board.
Does wiring check out
okay?
Repair/replace
the wiring
Replace voltage
the regulator
YesNo
No
Yes
Yes
YesNo
Check the wiring to the
voltage regulator
No
Figure 7 -1 Troubleshooting Generator, No Output Voltage
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