Inspecting Rectifier; Inspecting Rotor - Mitsubishi S3Q2 Service Manual

ELECTRICAL SYSTEM
2.6.4

Inspecting rectifier

Check that diodes in a rectifier function properly. To check,
measure both negative (-) and positive (+) resistance
alternately twice. If both infinite negative and infinite
positive resistances are observed, the diode is open-
circuited. If measured value is close to 0 Ω, the diode is
short-circuited. In either case, replace the rectifier with a
new one.
Note: Use a wide measuring range as much as possible. The
current flow during test is significantly lower than the
current that normally flows in the rectifier, by which
the accurate resistance may not be measured using a
tester, and this tendency is noticeable if the measuring
range is small.
2.6.5

Inspecting rotor

(1) Check that there is continuity between slip rings. If no
continuity is observed, replace the rotor with a new one.
(2) Check that there is no continuity between the slip ring
and the shaft (or the core). If continuity is observed,
replace the rotor with a new one.
12-16
Inspecting rectifier
Inspecting field coils for continuity
Checking field coils for grounding