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IvlAI1{Ttl{A1{CE
4.T
REMOYING THE
INSTRUMENT CABINET
(Cabinet Model)
a,
Remove
the
four
screws that fasten the rear
cover to the instrument
and
take off the rear
coYe
r.
b.
Rotate
the instrument
so
the panel
is
straight
up
and
the bottom
is
toward you.
c.
Remove the
two 3,/16-inch
Allen
set
screws
on
the bottom near the
panel
d.
LiJt the cabinet off the instrument.
(Rack
ModeI)
a.
Rbmove
tie
fout
scnews
on
ttle
back o{
t}le
irstru-
ment, to allow the dust cover to slide ilack.
b.
The bottom
plate
is
removed
by
means
of
lour
screws,
one
in
each
corner.
4.2
CLEANING THE
AIR
FILTER
Rack mounted
units are
equipped
with
an
air filter
which should be cleaned
lrequently.
The
air
lilter
is
located
at
the
rear
of the instrument and
is
a
washable
tYPe.
To
clean
the
air filter
pmceed as
follows:
a.
Remove
tIe filterlrom
the
instrument
and
take
ofI
any
large accumulation of
dirt
by vacuuming
or
gently tapping
with the
dirty
side
down.
b.
Direct
a
stream of hot water at the intake side
of
the
filter
to llush
out
t}le
dirt
aJId
old
adhesive.
c.
Shake
out excess water
and
a11ow
tie filter
to
dry.
d.
Spray
R-P
Filter
Coat
No.2 (or light
machine
oil)
on
the intake side of the
filter
until the
vis-
ible baffles are
liberally coated. Warnilrg:
Do not
rpply
so much
Jdhesive that
il
runs-r
drip-s
off
thc
surlace oI the
filter. Air
Filter oil is
available
at
most heating supply
stores.
e.
The
fi]ter is
now ready
for
service
and should
be
replaced in the instrument with the
coated
(intake) side toward the outside of the cabinet.
4.3
SELF
CHECK
The sell-check leature
tiat
has been
incorporated
into
the
Model
5228 should be used
to
check
the
oper-
ation of the
instrument
if
any
trouble
is
suspected. In
the CHECK position of the FIJNCTION SELECTOR
switch the inst-rument
counts
the
internal
100-kc
oscillator
ior
periods ol
time determined
by the
po-
sition
of
the FREQUENCY UNTI
switch. This
checks
the
major portion of the instmment
and
should
be
the
first
step
when
trouble
is
suspected. The
sel{
check
procedure
is
described below.
Set
the panel
controls
as
follows:
rUNCTION
SELECTOR
to
CHECK
STD.
CATE
TIME selector as indicated
belolv
MANUAL GATE closed
DISPLAY
TIME
-
min.
Correct
Indication
00100.
kc
0100.0
kc
100.0
kc
00000.
cps
0000.0
cps
STD,
GATE TIME
.001
"
.01
.1
1.
10.
Always
check
the instrument in the
sequence
indi-
cated, starting with the shortest
Gate
Time.
With
a
1
SEC
gate
time
one
digit
will
be
ofl the register.
Faulty operation
will
be
indicated by something other'
than
all
zeros
on
the
legister. with
a
10
SEC
gate
time
two
digits
will
be
ofl
tIe
register
and
it wil]
be
necessary
to
count
the number oI complete cycles
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