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UN
IT
4, 5;
KEYBOARD/DISPLAY
UNIT
—
Remove
the
cabinet, see
4.1
—
Remove
the
plastic
cover of the
mains
switch
—
The
textplate
can
now
carefully
be
removed
(it
is
fitted
by
double-sided adhesive
tape).
—
Remove
the
RF
output connector
piece, see 4.5.
—
Remove
the four screws
in
the corners
of the front plate
(cross
headed
screws).
—
Remove
front
plate
and
front
frame
with the
printed card
boards
U4
and U5. Be
careful
when
th^
complete
unit
is
removed from
the
29
pole
CIS-connector
of unit
10.
—
For
demounting
the
keyboard/display
interface
U4, remove 4
screws
M2.5,
which
are
visible
at:
the wired
side
of the pcb.
—
Now
unit
4
is
only
held
with
two
ClS-connectors
to the frontplate
with
the keyboard/display
U5^
—
Pull
out
the
pcb U4;
all
parts
of
this
card are
now
accessible.
—
For
demounting
pcb
U5
remove
six
countersunk
screws
M2.
5
of the front
plate.
rf-units
—
Dismantle the
instrument,
see 4.1
.
—
Remove
the screening
plate
fixed to
mains transformer and
RF
case.
—
Loosen
the
retaining
clips
of the
lEC-bus
adapter, unit
6,
and
remove
flat
cable
connection
to
the
CPU/U1
—
Remove
unit
1
(attention for
short
circuit
of
the
NiCd
battery,
when
pcb
is
removed)
—
Remove
the connectors S1
and S2
of
unit
2
—
Remove
unit
2
and
unit
3
—
Unsolder the coax
cables
LP1
,
LP2/LP3
of
unit
2
>-
Unsolder
the
coax
cable,
point
23
of
unit
3
—
Remove
the
RF
output connector
piece
854 from
progr. attenuator,
loosen nut
by
spanner 8
mm
(PM 5390S from
PA
stage 81
5).
—
Replug
the
RF
connector
'fR'
of
RF/unit
1
—
Remove
the
RF
output connector
piece
883, loosen nut
by
spanner
8
mm
—
Unsolder
all
connections
to
the
motherboard
of
the
RF
unit
except
coax
cables
(see
table'solder
connections",
fig.
42).
—
Loosen
the
two
junction
plates
and
the
ground connection between
RF
case
and
unit
10 (bottom
side)
—
Remove
the
4
countersunk screws
M4
at
the
right side wall.
—
Remove
the
complete
RF
case
incl.
attenuator
(PM
5390S:
incl.
power
amplifier)
—
Remove
all
screws
(8
x M2.5)
of the cover
plate
of
RF
case
and
take
it
off
—
Remove
twelve screws
M
2.5
of the
RF-motherboard
—
Remove
the
RF
motherboard
incl.
RF-unit
1
and
RF-unit 2
of the
RF
case
—
Remove
the
4
screws of
RF
motherboard
—
unit
RF-U1
and
RF-U2
can
now
be
removed from
the ClS-connectors of the
RF
motherboard.
Access
to
RF-U1/U2
—
pull
down
the
upper
screening cover
a
little
bit
and hook
off
three spring shackles
at
one
side
and
remove
the
cover.
—
all
four covers
can be
removed
In
the
same way.
All
components
of
pcbs
are
now
accessible.
For
all
checks
and
adjustments the complete
RF
units
must
be
closed
and
the
specified
warm-up
time
must
be
finished.
Attention:
When
RF-U1
and
RF-U2
are
assembled
again,
special
care
must
be taken: the
inside
scree-
ning
mats
of the
cover
may
not dip
(the
covers
must
be
slidely
movable).
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