Marconi LORAIN RHM800E50, Manual

Page: 30 / 74

Section 4367
relay on A9 causes the relay to release. activating ah
external fail alarm if connected.
7. TROUBLESHOOTING
7.1 Before attempting to troubleshoot this rectifier, it
must be determined that a failure has occurred in the
rectifier. Since various rectifier alarms sense battery
voltage. voltage
could reflect
to the as an alarm Erroneous alarm
due to incorrect battery may be
caused by other equipment, Some
examples of interconnecting equipment which
cause incorrect voltage are given below.
any interconnected equipment as a trouble cause
before proceeding.
a) When used in a power system, certain fail-
ures in DC-DC Converters
DC-AC
may affect battery voltage and sub-
sequently cause on the
to illuminate.
b) When used with other parallel connected
a failure in one may cause
on other to
Once trouble has been isolated to the
various visual and operational be made
to eliminate obvious failure causes.
Fault Isolation Chart
7.3
The isolation chart tn these instruc-
tions is to aid service personnel in
failures the chart is in the form
of a flow diagram interrogatory and
statements in diamond-shaped and rectangular geo-
metric figures,
A yes or no response suffi-
ciently answers each inquiry, and the servicing
should the respective YES or NO line
of flow to the next inquiry or statement. The
directive statements require that the perform
an adjustment or test to verify operational mndii
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tions. If the line of flow terminates in a entitled
POSSIBLE CAUSES, the servicing technicii should
each cause listed and take appropriate corrective
action if a faulty is located.
or under test. per-
s - l m u s t
is not made
with the
test
and some
the
test
equipment is
connected to the while it is operating.
and Information
W - G
that Qzz
from the
7.4 When a trouble symptom is localized to a
circuit card. that particular circuit card should be
replaced in its No attempt should be made to
troubleshoot or repair cards.
7.5 If the suspected cause of a trouble symptom is an
out of the
should be or reset using the appropriate
adjustment procedure.
7.6 Component failures are sometimes evident dur-
ing a visual of the Obvious trouble
symptoms such as
colored or burned components, open fuses. or
and
wire be corrected and the
cause determined before proceeding more detailed
procedures.
7.7 test procedures referenced on the fault
chart provide the servicing
with
methods for testing certain components
and for the presence or absence of Certain
control signals. Whenever a numbered test procedure
is encountered in the chart, service personnel should
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