Fluke 93 Service Manual page 125

6-4 DISASSEMBUNG THE SCOPEMETER
6.2.3
Removing
the
analog
A2
PCS,
to
enable
Hardware
SCOPE
Calibration
Adjustments
Referring
to figure 6.2.
use
the
following
procedure
to
remove
the
analog
A2
PC6.
1
.
First
open
the
ScopeMeter
{see Section
6.2.2).
2.
The
analog
A2
PCB
and
top screening are
secured
to the
bottom cover
with
two
M3
Torx
screws
(item 30).
Use
a Torx screwdriver
to
remove
the screws.
3.
Carefully
lift
the metal top screening,
while
pulling
It
backwards.
4.
Pull
the
battery wiring
plug
(Item 27, figure
6.1
)
out
of
the connector
on
the analog
A2
PCB.
5.
Use a
Torx screwdriver
to
loos^
the
two
black
screws
(item
1
3)
(do not
remove them) from
the
input
unit
assembly.
Now
the analog
A2 PCB
can be
lifted
out of the
bottom cover assembly.
6.
The
bottom
of the
analog
A2
PCd
shows
the
components
(potentiometers)
used
for
hardware
calibration
adjustments.
The Hardware
SCOPE
Calibration Adjustments are described
in
section
5.6.1.
NOTE:
The
digital
A
1
PCB
and
the metal shielding are
stiil
fixed to the top
cover
and
must be
connected
to
the
analog
A2 PCB
by
the
3(Ppoie
fiat
cable.
CAUTION:
Damage may
occur
rf
you
diaconnect the
flat
cable
between
the
two
printed
circuit
boards
withir)
ten
seconds
after
turning
off
the Instrument.
Damage may
also
occur
when
the
Analog
unit
(A2)
is
powered when
not
connected
to
the
Digital
unlt(A1).
6.2.4
Removing
the
digital
A1 PCB.
1
.
First
open
the
Scope
Meter (see Section
6.2.2).
NOTE:
Note
how
the30-pole
flat
cad/e
Is
positioned
in
the
connector
it
must
be
replaced
in
exactly
the
same way
When
the
ScopeMeter
is
opened,
the blue mar1<s
on
the
flat
cable
must be
visible.
Carefully
Hft
the upper
part of the
flat
cable connector on the
digital
A1
PCB.
This
plastic
clamp
must be
lifted
at both sides
simuHaneously
to
unlock
the
flat
cable.
Now
pull
the
flat
cable out
of
the connector
on
the
digital
A1 PCB. Do
not touch
the
flat
cable ends!