Fluke 8050A - 4-57. Troubleshooting Overview; 4-58. Troubleshooting Guide

•
¢
MAINTENANCE
TROUBLESHOOTING
measured voltage
is
beyond the limit, then
replacement
of
the
RMS
Converter
is
indicated.
7.
Measure the voltage
at
pin 6
of
the
RMS
Converter.
If
this voltage
is
greater than
±
0.5
mV
of
the recorded value in step
5,
adjust the
potentiometer on the
RMS
Converter so that
pin 6
is
±
0.2
mV
of
pin
7.
7.
Perform
the Calibration Adjustments.
4-57.
TROUBLESHOOTING
CAUTION
The pcb
assemblies
used in the 8050A
contain
CMOS
components which are static
sensitive.
Please
read and comply with
the
information
on
the static awareness sheet
given
in
the
beginning of
this
section.
WARNING
DANGEROUS VOLTAGES EXIST ON
PCB
ASSEMBLIES EXPOSED FOR
TROUBLE-
SHOOTING.
EXERCISE
CAUTION
WHEN
MAKING
MEASUREMENTS
ON
LtVE
CIRCUITS,
AND
USE
AN
INSULATED
TOOL
FOR
ALL
ADJUSTMENTS.
SET POWER
TO
OFF
BEFORE
REPLACING
ANY
COM-
PONENT
OR
DEVICE.
4-58. The following information
is
provided to help
isolate faults and direct the technician to possible causes.
Signal
level or node description by test point
is
given in
Table 4-12. A troubleshooting guide
is
presented in Table
4-13. This guide
is
intended to be used in conjunction with
the Performance Tests. After completing the tests, note
any discrepancies that have occurred, find the test
heading in Table
4-13
and the apparent symptom, and use
the possible cause as a starting point in troubleshooting
the problem.
Table 4-11. U33 Jumper Positions
DISPLAY READING JUMPER CONFIGURATION,
MP20
(All
Jumper
Pins
Installed)
AS VIEWED FROM
LEFT
SIDE
OF
8050A
..
.A
A
A•A
b
..
~
...
b
.•.
b
LOW
HIGH
G
F E
I
I
I
I
I
I I
1.0100
1.0497
+
t
t
t
I I
I
I
1.0498
1.0932
t
t
+
I
I
I
I
I
1.0933
1.1366
t
~
t
t
I
I
I
I
1.1367
1.1801
t
~
I I
I
I I
I
1.1802
1.2236
I
t
t
t
I
I
I
I
1.2237
1.2671
I
t
t
I
I
I
I
I
1.2672
1.3106
I
I
t
+
1.3107
1.3540
NO
JUMPERS
INSTALLED
JUMPER CONFIGURATION
FOR
AC CALIBRATION (RMS CONVERTER U32,
CALIBRATION
NETWORK, U33).
4-12
-
--------~--~.
T