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Section 6
TROUBLESHOOTING FLOWCHARTS
The “Flow Charts” in this section may be used in
conjunction with the “Diagnostic Tests” of Section 7.
Numbered tests in the Flow Charts correspond to
identically numbered tests of Section 7.
Problems 1 through 4 apply to the AC generator only.
Beginning with Problem 5, the engine DC control sys-
tem is dealt with.
Page 25
If Problem Involves AC Output
VOLTAGE &
FREQUENCY BOTH
HIGH OR LOW
FREQUENCY GOOD –
VOLTAGE HIGH
OR
VOLTAGE LOW
FREQUENCY GOOD –
ZERO OR RESIDUAL
VOLTAGE
NO-LOAD VOLTAGE
& FREQUENCY
GOOD
TEST 1 – CHECK
NO-LOAD VOLTAGE
& FREQUENCY
GO TO PROBLEM 1 GO TO VOLTAGE
REGULATOR ADUST-
MENT, PAGE xx
GO TO PROBLEM 2 GO TO PROBLEM 4
INTRODUCTION
Problem 1 – Voltage & Frequency Are Both High or Low
FREQUENCY GOOD.
LOW OR RESIDUAL
AC VOLTAGE
NO-LOAD FREQUENCY &
VOLTAGE GOOD BUT THEY
DROOP TO MUCH WHEN
LOAD IS APPLIED
FREQUENCY IS GOOD BUT
NO-LOAD VOLTAGE IS
HIGH OR VOLTAGE IS LOW
TEST 2 – CHECK
STEPPER MOTOR
CONTROL
GO TO
PROBLEM 2
GO TO
PROBLEM 4
GO TO VOLTAGE
REGULATOR
ADJUSTMENT,
PAGE 9