Fluke 93 - Troubleshooting; DIGITAL at PCB TROUBLESHOOTING

CORRECTIVE MAINTENANCE
7-7
7. 1.4.2 Performance Verification
Procedure
The Performance Verification
Procedure is a very quick way
to check most of the
ScopeMeter'e
specifications. It is based
on the specifications listed
in
Chapter
2 of this Service Manual.
If the
instrument fails of any
of these tests, Calibration
Adjustments (see chapter
5)
and/or repair
(see
chapter
7)
Is necessary.
The complete Performance
Verification Procedure Is
described in chapter 4.
7.1 .5 Troubleshooting
7
7-5. 7 Trouble shooting
htnts
OPENING THE SCOPEMETER:
To troubleshoot the
ScopeMeter, open the Instrument as described
in subsection 6.2.2 ''Opening the
ScopeMeter" of
chapters "OISASSEMBLINQ THE
SCOPEMETER^.
TEST POINT
AND COMPONENTS LOCATION:
Added with
the PCB layouts figures
10.1, 10-4, and 10.6 and the dicult diagrams
figures 10.2, 10.3,
1
0,6,
1
0.7,
and 10-8
are location reference lists for fast
location of the test points and the
components.
CONNECTING THE
GROUND (ZERO) LOGIC 0 REFERENCE:
While performing measurements,
ft Is possible to use the
metal shielding as zero reference. It is
also
possible to Install the metal screws,
as Is described in section 5.6.1
"Hardware SCOPE Calibration
Adjustments". You can
use one of the screws as a zero
reference: refer to figure 5.2.
LOGIC 1 LEVEL:
The logic one level
is *h5V.
7.1.6
Digital A1 PCB Troubleshooting
Rest remove the digital A1 PCB
as described In section 6.2.4
'Removing the digital PCB".
7.
1.6.1
Powetir^g the ScopeMeter
Power the ScopeMeter with
the powerAdapter/Batteiv Charger PMB907.
7. 1.6.2 Kernel Test
The Kernel tests the Address/Oata
outputs from the microprocessor
(D1201
),
the Interface
transmitter and receiver circuits of
the optical Interface, and the Random
Access Memories (RAM).
The
test results are measured with
an oscilloscope.
NOTE: If loading the ScopeMetefS
FlashROMs falls, It
is possible to get a ScopeMeter which
is not
functioning. For example:
if the eperaftng system of the ScopeMeter is corrupted,
it
is
not
possible to
operate the instrument normally. In
this case you should also use
the following
procedure to
establish communication
with the ScopeMeter. When communication
is
established,
you can reload the operating software Into
the FlashROMs. (For this
action you
need special software:
contact your nearest Fluke/PhUips
Service Center.)
1
,
Power
the ScopeMeter with the Power
Adapter/Battery Charger PM8907.
2,
G
round
teslpoint TP21
6,
tu rn
on the Scope Meter and re lease the
g
ro u nd {from testpol nt TPS 1
6)
.