Operating instructions
Maintenance--7B87
COMPONENT
REMOVAL
AND
REPLACEMENT
To
avoid
electrical
shock,
disconnect
the
instrument
from
the
power
source
before
replacing
components
.
The
exploded-view
drawing
associated
with
the
Replaceable
Mechanical
Parts
list
may
be
helpful
in
the
4-
1
0
CIRCUIT"
BOARDS
REMOVE
READOUT
BOARD
AS
FOLLOWS
:
1
.
Note
index
of
multi-pin
connector
attached
to
board
and
disconnect
cable
.
2
.
3
.
4
.
5
.
TO
REPLACE
READOUT
BOARD,
REVERSE
THE
ORDER
OF
REMOVAL
.
Loosen
set
screw
on
variable
switch
assembly
.
Remove
VARIABLE
(CAL
IN)
TIME/DIV
knob
and
attached
shaft
out
the
front
of
the
instrument
.
Remove
the
8
securing
screws
from
board
.
Lift
board
away
from
cam
switch
assembly
.
Figure
4-7
.
Readout
board
removal
procedure
.
removal
or
disassembly
of
individual
components
or
subassemblies
.
Component
location
and
circuit
board
locations
are
shown
in
the
diagrams
section
.
If
a
circuit
board
is
damaged
beyond
repair,
replace
the
entire
board
assembly
.
Part
numbers
for
completely
wired
boards
are
given
in
the
Replaceable
Electrical
Parts
list
.
A3-READOUT
CIRCUIT
BOARD
.
To
remove
the
circuit
board, follow
the
procedure
given
in
Figure
4-7
.
C1986-70I