Maintenance—
Type
575
Replacement
information
sometimes accompanies
the
im
proved
component
to
aid
in
its
installation.
Parts
Ordering Information
You
will
find
a serial
number
on
the
frontispiece
of
this
manual.
This
is
the
serial
number
of
the
instrument
for
which
this
manual
was
prepared.
Be
sure
that
the
number
on
the
manual
matches
the
serial
number
of
the
instrument when
ordering
parts
from
this
manual.
Each
part
in
this
instrument
has
been
assigned
a
6-digit
Tektronix
part
number.
This
number,
together
with
a
descrip
tion
of
the
part, will
be
found
in the
parts
list.
When
order
ing
parts,
be sure
to
include
both
the
description
of
the
part
and
the
part
number.
For
example,
a
certain
resistor would
be
ordered
as
follows:
R160A,
100 k,
y
2
w,
Fixed,
Precision,
1
%,
part
number
309-045, for Type 575 Transistor-Curve
Tracer,
serial
number
.
______
When
parts
are ordered
in this
manner,
we
are
able
to
fill
your orders promptly,
and
delays
that
might
result from transposed
numbers
in
the
part
num
ber
are
avoided.
NOTE
Always include
the
instrument
TYPE
and
SERIAL NUM
BER
in any
correspondence concerning
this
instrument.
TROUBLESHOOTING
General
Information
This
section
is
included
to
provide
you
with
information
about
the
Type
575 Transistor-Curve
Tracer
that
will
enable
you
to
more
efficiently
troubleshoot
the
instrument in the
event
of
equipment
failure.
During
troubleshooting
work,
you
should correlate
information
contained in
this
section
with
information
obtained from
other sections
of
this
manual.
We
have
not attempted to
give
detailed
step-by-step
pro
cedures
for
finding
the
cause
of
specific
troubles,
but
rather
have
attempted
to
outline
a
general
troubleshooting
guide.
This
guide
provides
a
means
for
determining
the
probable
defective
circuit
or part
from
the
symptoms
observed
rather
than
from detailed
voltage
or
resistance
measurements.
Although
the
575
is
a
complex
instrument,
it
can
con
veniently
be
thought
of
as
consisting
of
a
number
of
inter
related
basic
circuits
as
shown
in the
block diagram
contain
ed
in
the diagram
section
of
the
manual.
Each
of
these
cir
cuits
performs
a
specific
part
of
the
overall
circuit
operation
required
to
display
transistor
characteristic
curves
on
the
face
of
the crt.
If
any
one of
these
circuits
should fail,
a
definite
symptom
of
this
failure
will
be
apparent.
By
investigating
the possible
causes
of
this
symptom
by
means
of
systemized
circuit
checks,
it is possible to
determine
which
circuit
or
cir
cuits
are
at
fault.
After determining
which
circuit
is
defective,
additional
checks
will
allow
you
to
isolate
the
trouble
to
a
particular
part.
Separate
schematic
diagrams of
each
circuit
are contained
in
the rear
portion
of
this
manual
together
with
a
block
dia
gram
which
provides
an
overall
picture
of
instrument opera
tion.
The
reference
designation
of
each
electronic
component
of
the
instrument
is
shown
on
the
circuit
diagrams
as
well
as
important
voltages
and
waveforms.
These
voltages and
waveforms
may
be
used
during troubleshooting
work
to
iso
late
the
cause
of
the
trouble.
The
following
chart
lists
the
reference
designations
associated
with
each
circuit.
100
series
...........................................
Step
Generator
200 series
.............................................
Step
Amplifier
300
series
...................................
Horizontal
Amplifier
400
series
.......................................
Vertical Amplifier
600
series
.......................
Low
Voltage
Power
Supply
700 series
............................
Collector
Sweep
Circuit
800 series
................................................... CRT
Circuit
Switch
wafers
shown
on
the schematic diagrams
are
coded
to
indicate
the position
of
the
wafer
on
the
actual switches.
The
number
portion
of
the
code
refers
to the
wafer
numbers
on
the
switch
assembly,
wafers
being
numbered
from
the
front
of
the
switch
to
the
rear, and
the letters
F and
R
in
dicate whether
the front
or the
rear
of
the
wafer
is
used
to
perform
the
particular
switching
function. Photographic
de
tails
of
these
switches
are also shown
on
the
same
foldout
page
as
the
corresponding
circuit
diagram.
These
photo
graphs
are
provided
as
parts
location
guides.
All wiring
used
in
the 575 is
color
coded
to
facilitate
cir
cuit
tracing.
In
addition, primary power, filament,
and
regu
lated
power-supply
output
leads
are distinguished
by
specific
color
codes.
All
regulated
power-supply
output leads
follow
the
standard
RETMA
code. The
—150
volt
bus
wire
is coded
brown-green-brown;
the
+300
volt
bus
is
coded
orange-
black-brown;
and
the
+100
volt
bus
is
coded
brown-black-
brown.
The
widest
stripe
identifies
the
first color
of
the
code.
Circuit Isolation
Before
proceeding
with
detailed
troubleshooting
of the
in
strument,
make
sure
that
an apparent trouble
is
actually
due
to
a
malfunction
within
the
instrument
and
not
due
to im
proper
control
settings.
Instructions
for
the
operation
of
the
insrument
are
contained
in the
Operating
Instructions
section
of
this
manual.
If,
after
reviewing
the
Operating
Instructions,
you
determine that
control
settings are
not
at
fault,
you
should
next
check
the
calibration
of
the
instrument
according
to
the procedure contained
in
the
Recalibration
section
of
the
manual.
A
calibration
check
will
not
only
allow
you
to
correct
any
troubles
due
to
improper
calibration,
but
will also
enable
you
to
isolate
the
defective circuit should
an
actual
trouble
exist. If
a
trouble
exists
in
the
instrument,
you
will
reach
an
adjustment
or
check
while
going
through
the
recalibration
procedure
where
you
obtain an
abnormal
indication.
From
the adjustment
or
check
where
the
trouble
first
appears
and
from
the
indications
obtained,
you
will
be
able
to
determine
which
circuit
is
defective and
also
in
many
cases
which
por
tion
of
the
defective
circuit
is
at
fault.
When
you
have
determined
which
circuit
is
defective,
you
can
then
refer
to the
Circuit Troubleshooting
information
that
follows
where
procedures
are
given
for
troubleshooting
the
4-3
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 ...
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Page 54: ...Recalibration Type 575 C706 Fig 5 3 Left Side View 5 6 ...
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Page 100: ...INPUT AMPLIF1E ...
Page 104: ...TYPE 575 TRANSISTOR CURVE TRACER ...
Page 108: ...OSCILLATOR 4OOV UNREG TYPE 575 TRAN5I5TOR CURVE TRACER AB ...
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Page 119: ...Type 175 Tent S N 570 PARTS LIST CORRECTION Change to Q233 151 0137 00 2N21U8 MIO 298 1165 ...