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H 52005-301D
(3)
Slacken
the 4
BA socket-headed set
screws
in
all the control
\mobs
and remove
the \mobs.
(4)
Disconnect
the meter,
release
the meter
c
lamp (behind
the front panel),
and
remove
the meter.
(5)
Remove the
front panel
mask which is now fr
ee
.
(6)
Remove the
side
cover
of
the
voltmeter box, by
withdrawing the
two screws
that
hold it.
Unplug
the coaxial
connector
to the step attenuator
box
and withdraw the
6
BA screw
securing
the
attenuator box
to the
voltmeter
box.
Be careful
not
to
lose the
spacer
between
the
two units
which
m
ay
fall
out when the screw
is re-
moved.
(7)
Disconnect
from the
front
panel
terminals,
and
from the
step
attenuator, the five
leads that enter
the
step attenuator
box
through a
hole near the front.
Also
unsolder the connection
to
the front panel
earth
terminal.
(8)
Slacken
the screw
entering the
matching
transformer box,
and
withdraw the
screw
entering
the step attenuator
box,
in the
small bar
joining the rear
of the
two
boxes.
Swing the bar
aside.
(9)
Unscrew and
remove
the hexagon-headed
bushes
through which
the
shafts of
the
three attenuation controls enter the
instrument
while
supporting the
step attenua-
tor box, which will
then
be
freed
.
11.
When the
attenuator
box is
separated
from the
instrument,
the sides of
the
box can be
detached by withdrawing
the
screws
and
nuts that
hold th
em
.
12.
To
examine
the
components in
the
voltmeter box
(behind
the
voltmeter range
switch),
withdraw
the
two 6
BA screws
that hold
the side cover of
the
box
and
remove
the
cover.
The
two
boards carrying the
maj
ority of
the
components
are
held
in position by the four
,
outer,
corner
screws
in
the
la
rger
board.
13.
To obtain
access
to the components in
the
matching
transformer box, withdraw the two
6
BA
screws holding
its
side
cover
and remove the
cover.
1\tiAJNS TRANSFORMER
CONNECTIONS
14
.
T he
equipment
is
normally
supplied for connection to
supplies
between
190
V
-
260
V.
Switch S5
the
mains selector switch
is
secured
in this position
by
the
switch
plate.
If
the
input supply
voltage
lies between 95
V-
130
V
r emove the switch plate and reverse
it,
switch
S5
to the
115
V
position
and
refit the
plate.
15.
If
the
a. c. supply voltage
will lie
between
190
V
and
260
V,
the
two
primaries
must
be
in
series
and
ha
ve a
link between the
finish
F
of one and
the
start S of the other.
The a. c.
input must be applied to
the
other F
and
S
terminals
.
16.
If
the
a.
c
.
supply
voltage will
lie
between
95 V
and 130
V,
the two primaries
must
be in
parallel
and
ha
ve a
link
b
etween the
two
terminals
marked
Sand
a second
link
between the
two
terminals marked
F.
The a. c.
input
must be
applied
to
oneS
terminal
and
one F
terminal.
Nov
.
79
Chap
.
5
Page
3
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