Philips PM 3266 - Page 137

142
3.3.4.8.
E.H. r unit
(Unit
15)
—
Remove
the black metal screening
plate.
—
Unplug the
two single-wire connectors
to the power
supply
board
(unit
5).
—
Disconnect
the E.H.T.
connector after unscrewing
the swivel nut and discharge
the cable.
—
To extract the E.H.T.
unit, swivel
out by applying slight pressure
to one
side
of
this unit.
—
Before
screwing
the
E.H.T.
cable
on to a replacement E.H.T. unit, the E.H.T.
connector
should be greased
with
Silicon Dielectric
Compound. Order
no.
4822
390 20023.
3.3.5.
Removing the power
supply (Unit
5)
—
Remove the lower cabinet
plate.
—
Remove
the rear
plate
of
the instrument
(2
screws).
—
Remove
the black metal
screening plate.
—
Remove
the two screws which
secure the circuit
board to the rear panel.
—
Remove
the two screws
which secure
the circuit board to the bottom
side of its compartment.
—
Unplug
the
three multipole
connectors and disconnect the
two single-wire connectors
to the FOCUS
p.c.
board (unit
7).
—
Disconnect the
two single wire
connectors
to the
E.H.T.
voltage
multiplier (unit 1
5).
—
Carefully withdraw
the
circuit board from
its compartment.
3.3.6. Removing
units
on the top
side of
the
instrument.
3.3.6. 1. Storage
amplifier
(Unit
25)
—
This unit is
equipped
with
MOS
devices that are very sensitive to static
discharges.
In
order
to ensure safe handling refer
to
chapter 3.2.8.:
"Handling MOS
Devices".
—
Unplug
stocko
plugs
and other connections.
—
Unscrew
three
screws.
—
Remove high
tension
shield
and distance
piece and take the unit
out of the instrument.
3. 3. 6.
2. Trigger amplifier
unit
(Unit
9)
—
Unplug
stocko
plugs,
coax plugs and
other
connections.
—
Unscrew
three
screws.
—
Gently
slide
the unit out of the
connector
on the
time-base unit.
3. 3.
6.
3.
Final
X-amplifier
(
Unit
26)
—
Unplug
stocko
plugs and
other
connections.
—
Unplug
very carefully
the three
CRT
connections.
—
Unscrew two
screws and
gently
slide the unit
out of
the connector
on the
time-base unit.
3. 3. 6.
4. Time-base
uni
t
(
Unit
8)
—
Remove
the trigger
amplifier
as
described
in section 3.3.6.2.
—
Remove the
final
X-amplifier
as described in
section
3.
3.
6. 3.
—
Unplug
stocko
plugs, coax
plugs
and other
connections.
—
Unscrew five
screws and take
the unit
out of the instrument.
3.3.6.5. Final Y-amplifier
(Unit
13)
—
Remove
the two screws
which
secure
the bracket
to the side strip.
—
Disconnect
the miniature
coaxial plugs.
—
Unplug
the multipole
connector.
—
Remove
the delay-line
connections.
—
Disconnect
the wires from
the
C.R.T.-pins and carefully
lift
out
the
circuit board.
3.3.6.6.
Delay
line (Unit
4)
—
Remove the
connections
on
intermediate
amplifier and final
Y-amplifier.
—
Unscrew
two screws and
take
the
delay
line out of the instrument.