Philips PM 3266 - Page 136

141
3.3.4.
Removing
units
on
the
bottom
side
of the
instrument
3.3.4.
1.
Storage
logic
(Unit
22)
-
This
unit IS
equipped
with
MOS
devices
that
are
very
sensitive
to
static
discharges.
To
ensure
safe
handling
refer
to
chapter
3.2.8.:
"Handling
MOS
Devices".
-
Pull
of
the
knobs
from
R
1
4,
R
1
6 and R
1
7.
—
Remove
the long
shaft
from
R14.
-
Remove
two
clamping
pieces
that
attach
the unit
to the
front
panel.
—
Unplug
the
stocks plugs,
coax
plugs
and other
connections.
—
Pull
the
LED
out off
the
front
panel.
-
Slacken
three
screws
and take
the
unit out
of the
instrument.
3.
3.
4. 2.
A
ttenuator
(Unit
2)
-
Remove
the shielding
plate
at the
bottom side of
the
attenuator
(remove 8
screws).
—
Unplug
the
appropriate
multipole
connectors
and
coaxial
cables.
—
Remove
the
V/DIV
attenuator
knob.
-
Remove
the
two
Allen-key
screws,
which clamp
the attenuator
at the
bottom
side
to the front-panel.
—
Remove
the two
central
nuts
which
clamp the
attenuator
to the
frontpanel.
-
The
attenuator
can
be removed
by shifting
it backwards
and have
it leaving
the
instrument
via the
bottom
side.
3.34.3.
Trigger source
selector
(Unit
16)
—
Unplug
the four
multipole
connectors.
—
Remove the
two hexagon
screws
that secure
the board to the
front
panel.
—
Unscrew
the two screws
at the
rear side of
the board.
—
Unsolder
the
wires at the
components
side of the board.
—
Unplug
the two
miniature
coaxial plugs
at
the
soldering
side of the board.
—
Carefully lift
the
unit out of the
oscilloscope.
3.3.4.4.
Intermediate
amplifier
(Unit
12)
—
Remove
the various
plugs.
—
Unscrew
the
screws that secure
the
unit to the chassis.
—
Unsolder
the
delay line
connections.
3.3.4. 5. Z-amplifier
(Unit 1
1)
—
Remove
the black
metal
screening plate.
—
Desolder 7
connections
coming from
the focus
unit.
—
Unplug
the stocko plugs, coax
plugs, and other
connections.
—
Remove
three distance
pieces and
one screw and
take the unit
out.
3.3.4.5.
Additional
power
supply (Unit
24)
—
Remove
the black
metal screening
plate.
—
Unplug the stocko
plugs
and other connections.
—
Remove
four
screws and take
the unit
out.
—
When
mounting the
unit, don't
forget to mount the earth
tap for
focus and EHT
unit
!!
3.3.4.
7.
Focus
unit (Unit
7)
—
Remove the
black
metal screening
plate.
—
Desolder
seven
connections on
the Z-amplifier unit.
—
Remove
the rear
plate and
gently
take
off the CRT socket.
—
Unplug the
—3
kV
plugs
on
the
additional power supply
unit.
—
Unplug
the
connections on the power supply.
—
Remove
the remaining
connections.
—
Unscrew
six screws
and take the unit
out
of the instrument.