Fluke 732a - External Symptom Troubleshooting; Internal Voltage Measurements

732A
4-49.
External
Symptom
Troubleshooting
4*50-
Use
Table
4“2
to
isolate
problems
within
the 732A,
using
external
symptoms.
Table
4*1
lists the
required
test
equipment
for
trouleshooting.
4-51.
Internal Voltage
Measurements
WARNING
TO
AVOID
ELECTRICAL SHOCK
HAZARD,
OBSERVE THE
FOLLOWING PRE-
CAUTIONS WHILE
WORKING ON
THE
INSIDE
OF
THE 732A. REMOVE ANY
JEWELRY BEFORE
BEGINNING TESTING.
HIGH VOLTAGE AC
MAY
BE PRESENT
DURING THE FOLLOWING
TESTS, DO
NOT
PERFORM ALONE. EXERCISE APPRO-
PRIATE CAUTION TO
AVOID ELECTRICAL
SHOCK
WHEN WORKING IN OR AROUND
THE
VICINITY
OF
THE AC POWER
CONNECTOR, FUSEHOLDER,
AND
POWER
TRANSFORMER.
THE BATTERY ASSEMBLY
IS CAPABLE OF
GENERATING
EXTREMELY
HIGH
PEAK CURRENTS. AVOID ACCIDEN-
TAL SHORTING
OF
BATTERY TERMINALS.
CAUTION
The
following tests
are conducted
with
power
applied to the
Instrument. To
avoid
Instrument
damage,
exercise
appropriatecaution
to
avoid
Inadvertently shorting
adjacent
test points or
circuit
board traces
with
test probes
or other
Instrument(s).
CAUTION
To
insure
continued
Instrument
performance,
do not attempt to replace Individual wires in
the reference output wiring harness.
Replace
the entire harness.
4-52.
Use
the tests
shown
in Table
4-3
to isolate
problems
to the major
functional circuit
groups
of
the
732A.
It
is
assumed that
the externa!
symptoms given
in
Table
4-2
have
been
examined and that
the
primary
circuit
of the power
transformer
is
operable.
This
procedure is conducted with
the
instrument
energized,
observe
the previously
stated
WARNINGS
and
CAUTIONS.
4-53.
Oven Repair
4-54.
Shifts in the
output level
which cannot
be
compensated
for
by adding or removing
jumpers
from
the
A7 Calibration PCB will require
the
entire Oven
Assembly
to
be
returned
to
Fluke
and exchanged for
a
working unit. Do not attempt to repair
the
circuitry
involving Ul, U2, Ql,
Q2,
Q5,
the resistors associated
with
TPll through TPM,
or any other component(s)
associated with the aforementioned
components.
Special
procedures
and
auxilliary test
equipment
are necessary
for
component replacement
within the Reference circuit.
Module exchange is provided as the most
economical
and
expedient method of repair for the user.
4-16