Philips pm3232 - Cabinet Plates; Graticule Illumination Lamps; Text Plate of C.R.T. Controls; Time-Base Unit

92
3.3.4.
CABINET
PLATES
Top
and
bottom cabinet plates can be
taken off
after
removing
four
screws
for
each plate.
3.3.5.
GRATICULE ILLUMINATION
LAMPS
—
Remove the bezel with graticule,
filter
and
mask
—
Squeeze lamp holder flanges slightly Inwards
and push the lamp holder out
of the frame.
Be careful not
to
mechanically
load the
soldering tags of the
lamp
holder, as they break
easily.
The bulb Is then accessible.
To
refit:
—
Push
the
lamp holder back In its opening until
the
hooks
on
the
flanges snap over the frame
IMPORTANT:
Take care that the
sign on the lamp holder points
towards
the
top
of the
oscilloscope in order
to avoid
short circuits (Fig.
3.18.).
3.3.6.
PILOT LAMP
The pilot lamp is removed in the
same way as
the
graticule Illumination lamps.
3.3.7.
TEXT PLATE
OF C.R.T.
CONTROLS
—
Remove the bezel with graticule filter and
mask
-
Remove
the knobs
of the
ILLUM, FOCUS
and INTENS potentiometers
—
Remove the
fixing
nuts around the shafts of the ILLUM and
INTENS
potentiometers
3.3.8.
TIME-BASE
UNIT
-
Remove the
X
POSITION, TIME/cm and
LEVEL knobs
—
Unplug all connectors on the time-base board
(a
few connectors
can be
unplugged
at
the vertical amplifier
board)
—
Remove two screws
A
(Fig.
3.16.)
—
Remove two
screws
B
(Fig.
3.16.)
—
Remove two
screws and nuts
C
(Fig.
3.16.)
—
Lift the
unit
out of the
instrument
—
When
refitting
the unit,
make sure that
the
screening
plate
between time-base and vertical amplifier
unit
clicks into place over the cross bars of the
frame.
Note: In order
to
maintain the mechanical strength of the oscilloscope, the time-base
unit and the vertical
amplifier unti must
not be removed
at
the same time.
3.3.9.
VERTICAL AMPLIFIER UNIT
-
Remove
the
AC-O-DC, AMPL and POSITION knobs
-
Set the
AC-O-DC
switches
SK16
&
19
to 0
-
Remove all
connectors
on
the amplifier
board
-
Remove
two
screws
D
(Fig.
3.17.)
—
Remove two screws
E (Fig.
3.13.)
—
Remove two screws and nuts
C
(Fig.
3.16.)
—
Lift the unit out of the Instrument
-
When refitting the unit, make sure
that the AC-O-DC switches are
In
0
position and
that the
screening
plate
between time-base and amplifier
unit clicks
into place over the cross
bars of the
frame