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REMOVAL OF
COVERS
WARNING:
DANGEROUS AC VOLTAGES
ARE EXPOSED
WHEN
COVERS
ARE
REMOVED
WITH
AC
SUPPLY
CONNECTED. COVERS SHOULD
BE
REMOVED
BY AUTHORISED PERSONS ONLY.
5.2
(1)
Switch
the instrument
POWER
switch
to
STANDBY
and
switch
off
the
a.c. supply
at
the
bench
outlet.
Unplug
the
power
lead from the
rear
panel of the instrument.
(2)
Remove
the
six
screws from
the particular
cover
(top or
bottom)
which
is
to
be removed.
(3)
Remove
the
two
rubber plugs (located near
to
the
rear
end) from both
side
panels of the instrument
and
slacken,
by
about two
turns,
the
screws revealed.
(4)
Grip
the
rear
panel assembly
and
ease
it
back
from the
main
case
to
the
maximum
extent available (about
5mm).
(5)
The
rear
edge
of either
cover can
now
be
lifted
and
the
cover
with-
drawn
outwards
and
rearwards.
Take
care
not
to
displace or
damage
the
RF
gasket material
when
removing
or replacing covers.
POWER
SUPPLY
TESTS
5.3
(1)
Do
not
connect
the a.c.
mains
supply.
Check
that
the
mains
fuse
is
correctly rated
for
the supply
voltage
range,
as
marked on
the
rear
panel
.
(2)
Check
that
the
6V
d.c. supply
fuse
on
the inner face of the
rear
panel
is
a
2A
quick action type
(to
remove
top
cover
see para. 5.2)
(3)
Set the
front
panel
POWER
switch
to
ON
and remove
the locking plate
of the
rear
panel voltage selector switches
(see para. 5.1)
(4)
Set the multimeter
to
read
'ohms'
and connect between
the
line
and
neutral pins
of the rear panel
mains
input plug.
Set the
mains voltage
selection switches
to
the
positions
in
Table 6 and
verify satisfactory
resistance readings.
(5)
Set the
voltage
selector switches
to
the correct
positions for
the
local
a.c. supply (page
5-1
Table
4)
and
secure the locking
plate.
(6)
Do
not
connect
the
mains
supply,
but with the
front
panel
POWER
switch
at
ON,
set
the
OUTPUT
switch
to
NORMAL.
9081
&
9082 Vol
.
2
5-3
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