Fluke 93 Service Manual page 174

7
-4fi
CORRECTIVE MAINTENANCE
7.
2.
5.6
Input
unit
assembly replacement
Figure
7.
14 Irput
unit
assembly
Referring to figure 7.14. use the
foilowing
procedure
for Input
unH assembly
replaoOTeni.
1
.
Remove
the
front
cover assembly.
2
.
Disassem
bl
e the
bottom cove
r
assemb
ly.
3.
Remove
the
30-pole
flat
cable.
4.
Unsolder
the wiring
(6x) of
the
input terminals from the analog
A2 PCB.
5-
The
input
unit
assembly
Is
clamped
onto the
analog
A2 PCB. Loosen
these
clamps and
pull
the
input unit
assembly
from the analog
A2
PCB.
NOTE:
The
white gaskets
on
the input terminals (4x)
are sealed
to,
and must remain
with the input
unit
assembly.
Do
not
damage
the
gaskets
and do
not separate them
from
the Input
unit
assembly. Correctly
fitted
gaskets assure
the sealing of the ScopeMeter.
6. Reinstall
the
front unit
assembly.
7.
2. 5.
7 Top cover assembly
replacement.
Referring
to figure 7.12.
use
the following
procedure
for top
cover assembly
replacement.
1
.
Remove
i^e bottom cover assembly.
2.
Remove
the 30-pole
fiat
cable.
3.
The
digital
A1
PCB
and metal screening are secured
to
the lop cover with four
M3
Torx
screws
(Item 33).
Two
of
these
screws
contain
standoffs,
be sure
to put
them
on
the
right
place
again.
Use a
Torx screwdriver
to
remove
the screws.
4.
Remove
the metal
A1 screening from
digital
At
PCB.
5.
Lift
the
digital
A1
PCB
out
of
the top cover.
Be
careful not to
damage
the
infrared
LED
and
phototranslstor of
the
optical Interlace.