ON
4
MAINTENANCE
PREVENTIVE
MAINTENANCE
Air
Filter
The
Type
575
Transistor-Curve
Tracer is
cooled
by
air
drawn
into
the
instrument
through
a
washable
filter
con
structed
of
adhesive-coated
aluminum wool.
If
this filter
is
allowed
to
become
dirty,
it
will restrict
the
flow
of
air
and
may
cause
the
instrument
to
overheat.
You
should
inspect,
and
dean
if
necessary,
the
filter
every three
months.
If
the
filter
is
damaged,
you
should
replace
it
as
soon
as
possible
to
prevent
dust being
drawn
into
the
instrument.
To
remove
the
loose
dirt
in the
filter,
rap
the
filter gently
on
a
hard
surface.
Then
wash
the
filtor
briskly with hot soapy
water.
After
rinsing
and drying thoroughly, coat
the
filter
with
'
Handi-Koter"
or
"Filtercoat”
,
products
of
the
Research
Products
Corporation.
These products are
generally
avail
able
from
air-conditioner
suppliers.
Fan Motor
To
protect
the
fan
motor
bearings, they
should
be
lubri
cated
every three
or
four
months
with a few
drops
of
light
machine
oil.
Visual
Inspection
You
should
visually
inspect
the
entire
instrument
every
few
months for possible
circuit
defects.
These defects
may include
loose
or
broken connections, damaged
binding
posts,
impro
perly
seated
tubes, scorched or burned parts,
or broken
terminal
strips
as well as many
others.
For
most of
these
troubles,
the
remedy
is
apparent,
but
particular
care
must
be
taken
when
scorched or
burned
components are
detected.
Burned
parts
are often the
result
of
other,
less
apparent,
de
fects
in
the
circuit.
Therefore,
it
is
essential
that
you
deter
mine
the
cause
of
overheating
before
replacing
damaged
parts
in
order
to
prevent
damage
to
the
new
components.
Recalibration
The Type
575
is
a
stable
instrument,
and
will
provide many
hours
of
trouble-free
operation.
To insure the
reliability
of
measurements
made
with
the
Type
575 however, we suggest
that
you
recalibrate
the
instrument after
each
500
hours
of
operation
(or
every
six
months
if
used
intermittently).
A
complete
step-by-step
procedure
for
recalibrating
the
instru
ment
is presented
in
the Recalibration
section of
this
manual.
REMOVAL AND REPLACEMENT OF PARTS
The
procedures required
for
replacement
of
most
parts
in
the
Type
575 are
obvious.
Detailed
instructions for
their
re
moval
are
therefore
not
required.
Other
parts,
however,
can
best
be
removed
if
a
definite
procedure
is
followed.
Instruc
tions for
the
removal
of
some
of
these
parts
are contained
in
the
following
paragraphs.
Because
of
the
nature
of
the
in
strument, replacement
of
certain
parts
will require
that
you
recalibrate
portions
of
the
instrument
in
order
to
insure
pro
per
operation. Refer
to
the
Recalibration
section
of this
manual.
Removal of
Panels
The panels
of
the
Type
575
are
held
in
place
by
small
scrowhcad
fasteners. To
remove
the
side
panels,
use
a
screw
driver
to
rotate
the
fasteners
approximately
two
turns
coun
terclockwise;
then
pull
the
upper
portion
of
the
panels
out
ward
from
the
carrying
handles.
To
remove
the
bottom
panel,
lay
the
instrument
on
its
side, rotate
the
fasteners
two
turns
Fig.
4-1.
Removal
of
the
instrument
side
panels.
4-1
Summary of Contents for 175
Page 4: ...VWTICM OINltAlO TRANSISTOR CUM TRACfR UB l COUlClO r hokizoniai VCKIJ O lUnK Hix M Type 575 z ...
Page 6: ...NOTES ...
Page 26: ...NOTES ...
Page 48: ...NOTES ...
Page 54: ...Recalibration Type 575 C706 Fig 5 3 Left Side View 5 6 ...
Page 56: ...NOTES ...
Page 100: ...INPUT AMPLIF1E ...
Page 104: ...TYPE 575 TRANSISTOR CURVE TRACER ...
Page 108: ...OSCILLATOR 4OOV UNREG TYPE 575 TRAN5I5TOR CURVE TRACER AB ...
Page 115: ... 300 ...
Page 119: ...Type 175 Tent S N 570 PARTS LIST CORRECTION Change to Q233 151 0137 00 2N21U8 MIO 298 1165 ...