Cabinet Plates; Graticule Illumination Lamps; Text Plate Of C.r.t. Controls; Time-Base Unit - Philips pm3232 Instruction Manual

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