Tektronix TM 501 User manual
Serial
Number
Tektronix,
fnc.
P.O.
Box
500
Beaverton,
Oregon
97005
-®-
Phone:
644-0161
Cables:
Tektronix
070
-
1
3
04-00
572
are
irelgri
patents
and/or
pending
TIV1501
TABLE
OF
CONTENTS
Page
INSTALLATION
PROCEDURE
1
OPERATING
INSTRUCTIONS
4
POWERING
UP
4
BUILDING
A
SYSTEM
5
SPECIFICATIONS
6
SYSTEM
MAINTENANCE
7
GENERAL
7
TROUBLESHOOTING
AIDS
8
TROUBLESHOOTING
TECHNIQUES
8
PARTS
ORDERING
AND
REPLACEMENT
10
SERVICE
INFORMATION
14
INTERFACE
PIN
ASSIGNMENTS
15
DETAILED
BLOCK
DIAGRAM
15
PARTS
LOCATION
GRID
16
ELECTRICAL
PARTS
LIST
17
SCHEMATIC
19
MECHANICAL
PARTS
LIST
20
EXPLODED
VIEW
DRAWING
REV
B.
APR
1979
j
TM
501
INSTALLATION
PROCEDU
efora
you
start...
1.
Check
the
rear
pane!
markings.
!f
the
factory
settings
are
compatible
with
the
available
line
voltage
and
frequency,
insert
the
desired
plug-ins.
Use
the
bail
to
raise
the
front
of
the
instrument.
...go
to
Operating
Instructions...
2.
If
a
change
is
needed,
follow
these
steps;
a.
Line
Selector
Block(s)
Remove
the
two
hold-down
screws
on
the
top
of
the
dust
cover
cabinet
and
lift
the
cabinet
off.
This
gives
easy
access
to
the
Line
Selector
blocks
located
on
the
main
circuit
board.
Jumper
Block
The
instrument
can
be
dam¬
aged
by
using
the
120
V
Line
Selector
block
with
a
220
V
nominal
line
votage.
1
REV.
8,
AUG.
1974
b.
Line
Range
Taps
Standard
Transformer
(SN
B050000
-
below)
Line
Selector
Block
Position
Regulating
Ranges
L
Do
not
use
Internally
disconnected
M
(110
V
Nominal)
^
99
VAC
to
121
VAC
H
(120
V
Nominal)
108
VAC
to
132
VAC
Universal
Transformer
(SN
B050000-up)
Line
Selector
Block
Position
Regulat
120-Volts
Nomina!
:ing
Ranges
220-Volts
Nominal
L
90
VAC
to
110
VAC
180
VAC
to
220
VAC
M
99
VAC
to
121
VAC
198
VAC
to
242
VAC
H
108
VAC
to
132
VAC
216
VAC
to
264
VAC
Line
Fuse
Data
0.6
A
slow-blow
0.3
A
med-blow
c.
Rear
Panel
USsIfOTgKiriAil
ARC
P8€S»f
m
T«sS
Primary
taps
220
Volts
0.3
A
med-blow
3.
Replace
the
cabinet.
4.
If
necessary,
change
the
line
cord
power
plug
to
match
the
power
source
receptacle
or
use
an
adapter.
5.
Plug
the
cord
into
the
power
source.
6.
Insert
the
desired
plug-ins.
7.
Use
the
bail
to
raise
the
front
of
the
instrument.
...QO
t©
OpBrBtlsIQ
loSti'IICtioriS...
REV.
B.
AUG.
1974
TM
501
Power
Module
with
piug-m.
3
INTRODUCTION
Description
The
TEKTRONIX
TM
501
Power
Module
is
a
single¬
compartment
wide
mainframe
for
the
TM
500
Series
of
Modular
Instrumentation,
it
is
a
basic
power
source
for
the
many
plug-in
module
members
of
the
TM
500
Series
family.
Factory
options
allow
customer
modification
using
signal
access
at
the
plug-in
module/power
module
interface
to
provide
rear
panel
inputs
and
outputs.
Power
Source
This
instrument
is
designed
to
operate
from
a
power
source
with
its
neutral
at
or
near
earth
(ground)
potential
with
a
separate
safety-earth
conductor.
It
is
not
intended
for
operation
from
two
phases
of
a
multi-phase
system,
or
across
the
legs
of
a
single-phase,
three-wire
system.
Power
Usage
The
TM
501
can
require
up
to
35
W
of
power
at
the
upper
limits
of
the
high
line
voltage
ranges.
Actual
power
consumption
depends
on
the
particular
module
and
operating
mode
selected.
Operating
Temperatures
The
TM
501
is
designed
to
operate
in
ambient
tempera¬
tures
between
0°C
and
-t-50°C.
Before
operating
the
TM
501
after
storage
in
temperatures
within
the
specified
storage
range,
allow
the
chassis
to
return
to
room
ambient
before
applying
power.
POWERING
UP
Plug-in
Modules
)
CAUTION
J
Turn
the
Power
Module
off
before
inserting
the
plug¬
in;
otherwise,
damage
may
occur
to
the
plug-in
circuitry.
Module
Installation
1.
C
heck
the
location
of
the
white
plastic
barriers
on
the
interconnecting
jack
to
insure
that
their
locations
match
the
slots
in
the
edge
of
the
plug-in
module's
circuit
board.
2.
A
l
i
gn
the
plug-in
module
chassis
with
the
upper
and
lower
guides
of
the
compartment.
Push
the
module
in
and
press
firmly
to
seat
the
circuit
board
in
the
interconnecting
jack.
(Remove
the
plug-in
module
by
pulling
on
the
white
release
latch
located
in
the
lower
left
corner
of
each
module.)
3,
P
u
ll
the
POWER
button
on
the
right
side
of
the
TM
501.
Some
plug-in
modules
have
independent
power
switches,
usually
labeled
OUTPUT,
controlling
application
of
mainframe
power
to
the
module
itself.
Push
this
button
to
activate
the
plug-in
module.
Loading
Considerations
The
TM
501
can
require
up
to
35
W
of
power
from
the
line
at
high-line
voltage
range
settings.
Actual
power
consumed,
of
course,
depends
on
the
particular
module
selected.
This
power
capability
can
best
be
utilized
by
carefully
planning
the
external
loads
and
the
resulting
power
distributions.
Optimum
conditions
would
dissipated
as
much
power
as
possible
in
external
loads
in
an
ambient
temperature
around
+25°C,
The
TM
501
provides
the
plug-in
module
with
access
to
a
pair
of
heat-sinked,
chassis-mounted
transistors,
one
NPN
and
one
PNP.
These
Series-Pass
transistors
allow
plug-in
modules
to
operate
in
power
ranges
not
possible
if
the
power
had
to
be
dissipated
in
the
modules
themselves.
REV.
B,
APR,
1975
Operating
Instructions—TIVI
501
Family
Compatibility
Mechanically,
the
plug-in
modules
are
very
similar
to
other
TEKTRONIX
product
families.
However,
they
are
not
electrically
compatible.
Therefore,
the
TM
501
inter¬
face
has
barriers
on
the
mating
connectors
between
pins
6
and
7
to
insure
that
incompatible
plug-ins
cannot
be
inserted.
See
Figure
1.
A
compatible
module
will
have
a
matching
slot
between
pins
6
and
7
of
its
main
circuit
board
edge
connector.
This
slot
and
barrier
combination
is
the
primary
keying
assignment.
Another
identifier
for
TM
500-compatible
plug-in
modules
is
the
white
color
of
the
release
latch.
Customizing
the
Interface
The
modularity
of
this
instrumentation
system
provides
for
a
host
of
functions
to
be
performed
by
the
plug-in
modules.
Specific
functions
are
grouped
into
families
or
classes,
of
which
there
may
be
several
plug-in
module
members.
For
instance,
some
classes
are
Power
Supplies,
Signal
Sources,
Measurement
and
so
forth.
Each
modular
member
of
a
functional
family
will
have
a
second
slot
peculiar
to
its
family
assignment
located
in
its
edge
connector.
The
TM
501
user
can
“program"
the
Power
Module
to
accept
only
members
of
a
certain
family
by
installing
a
second
barrier
in
the
interface
connector
to
match
the
module's
slot
location.
For
extra
barriers,
order
TEKTRONIX
Part
Number
214-1543-02.
Rear
Panel
The
rear
sub-panel
is
punched
for
BNC
and
multi-pir
connector
mountings.
Customer-
or
factory-installed
connectors
and
wiring
{see
following
description
of
catalog
Option
2}
could
provide
external
access
to
the
interface
for
externa!
I/O
control.
This
feature
makes
the
TM
500
Series
Modular
Instrumentation
System
very
flexible.
SIGNAL
SOURCE
FAMILY
KEY
MEASUREMENT
FAMILY
KEY
TM
500
FAMILY
KEYING
Operating
Instructions—TM
501
Option
2.
This
factory-instaHed
option
adds
25*mil
squarepin
connectors
to
the
rear
of
the
interconnecting
jack
at
at!
pin
locations
from
pins
14A
and
B
through
pins
28A
and
B.
This
wit!
keep
the
interface
flexible
by
making
it
easy
and
fast
to
change
customized
wiring
using
prepared
wires
with
squarepin
receptacles
and
iong-nose
pliers
or
tweezers.
It
also
protects
the
circuit
board
from
damage
by
repeated
soldering
and
unsoldering
of
jumper
wires.
This
option
also
adds
a
BNC
connector
and
a
50-pin
connector
to
the
rear
panel.
These
connectors
are
not
pre-wired
in
order
to
give
a
system
designer
as
much
flexibility
as
possible,
instead,
prepared
jumpers,
coax
cables,
and
interconnection
jack
barriers
are
included
in
a
kit.
SPECIFICATIONS
Power
Requirements
Line
Voltage
Ranges.
Universal
Transformer.
100,
110,
120,
200,
220,
240
VAC,
all
within
10%.
Range
changing
for
transformer
accomplished
with
quick-change
line-selector
blocks.
Power
Cord
Conductor
Identification
Conductor
Color
Alternate
Color
Ungrounded
(Line)
Brown
Black
Grounded
(Neutral)
Blue
White
Grounding
(Earthing)
Green-Yellow
Green-Yellow
Line
Frequency
Ranges.
Universal
Transformer;
48
Hz
to
440
Hz.
Power
Consumption.
Maximum
primary
power
approxi¬
mately
35
W
at
high
line.
Actual
power
consumption
depends
on
plug-in
selection
and
operating
modes.
Supplies
(Unregulated)
Two
25
VAC
windings,
500
mA
each.
-t-33.5
V
and
—33.5
V,
500
mA,
maximum,
17.5
VAC
and
+11.5
V,
1.0
A,
maximum,
shared
in
any
combination
between
these
two
supplies.
NOTE
Current
and
voltage
ratings
are
for
main
frame
maintenance
only,
in
practice,
not
all
available
power
may
be
used
at
once.
More
detailed
information
is
supplied
with
kit
040-0652-03
(TM
500-plug-in).
Temperature
Range
Operating:
0*^0
to
-rBO'^C.
Nonoperating:
—40°C
to
+75°C.
Altitude
Range
Operating;
To
15,000
feet.
Nonoperating:
To
50,000
feet.
Other
Dimensions
with
Feet
and
Bail:
H
6.0
in.,
W
3.9
in.,
L
15.3
in.
Weight
without
Plug-ins;
Approximately
6.0
lb.
REV
F,
APR
1979
GENERAL
MAIN
Introduction
This
section
of
the
manual
is
meant
to
support
the
entire
TM
500
Series
family
of
modules
with
a
general
coverage
of
the
most
commonly-needed
service
information
pertinent
to
preventive
maintenance,
troubleshooting,
ordering
parts,
and
replacing
components
and
sub-assemblies.
Cabinet
Removal
^A
R
N
I
N
G
I
Dangerous
potentials
exist
at
several
points
through-
out
the
system.
When
the
system
must
be
operated
with
the
cabinet
removed,
do
not
touch
exposed
connections
or
components.
Some
transistors
have
voltages
present
on
their
cases.
Disconnect
power
before
cleaning
the
system
or
replacing
parts.
Two
screws
on
the
top
secure
the
cabinet
to
the
TM
501
frame.
Remove
them
and
lift
the
cabinet
straight
up.
Do
not
operate
the
system
with
the
cabinet
removed
any
longer
than
necessary
for
troubleshooting
and
calibration.
Re-install
the
cabinet
to
protect
the
interior
from
dust
and
to
remove
personnel
shock
hazards.
Cleaning
^
CAUTION
l!
s
<
Avoid
using
chemical
cleaning
agents
which
might
damage
plastic
parts.
Avoid
chemicals
containing
benzene,
toluene,
zylene,
acetone,
or
similar
solvents.
Exterior.
Loose
dust
may
be
removed
with
a
soft
cloth
or
a
dry
brush.
Water
and
a
mild
detergent
may
be
used;
however,
abrasive
cleaners
should
not
be
used.
Interior.
Cleaning
the
interior
of
a
unit
should
precede
calibration
since
the
cleaning
processes
could
alter
the
settings
of
calibration
adjustments.
Use
low-velocity
com¬
pressed
air
to
blow
off
accumulated
dust.
Hardened
dirt
can
be
removed
with
a
soft,
dry
brush,
cotton-tipped
swab,
or
a
cloth
dampened
in
a
solution
of
water
and
mild
detergent.
Preventive
Maintenance
Preventive
maintenance
steps
performed
on
a
regular
basis
will
enhance
the
reliability
of
the
instrumentation
system.
However,
periodic
checks
of
the
semiconductors
in
the
absence
of
a
malfunction
are
not
recommended
as
preventive
maintenance
measures.
See
the
semiconductor
checking
information
under
Troubleshooting
Techniques
which
follow.
A
convenient
time
to
perform
preventive
maintenance
is
just
before
instrument
calibration.
Calibration
To
insure
accurate
signal
generation
and
measurement,
the
performance
of
individual
units
comprising
the
system
should
be
checked
periodically.
Refer
to
the
Instruction
Manual
for
each
unit
for
complete
calibration
and
verifica¬
tion
procedures.
Repackaging
for
Shipment
If
the
Tektronix
instrument
is
to
be
shipped
to
a
Tektronix
Service
Center
for
service
or
repair,
attach
a
tag
showing:
owner
{with
address)
and
the
name
of
an
individual
at
your
firm
that
can
be
contacted,
complete
instrument
serial
number
and
a
description
of
the
service
required.
Save
and
re-use
the
package
in
which
your
instrument
was
shipped.
If
the
original
packaging
is
unfit
for
use
or
not
available,
repackage
the
instrument
as
follows:
Surround
the
instrument
with
polyethylene
sheeting
to
protect
the
finish
of
the
instrument.
Obtain
a
carton
of
corrugated
cardboard
of
the
correct
carton
strength
and
having
inside
dimensions
of
no
less
than
six
inches
more
than
the
instrument
dimensions.
Cushion
the
instrument
by
tightly
packing
three
inches
of
dunnage
or
urethane
foam
between
carton
and
instrument,
on
all
sides.
Sea!
carton
with
shipping
tape
or
industrial
stapler
The
carton
test
strength
for
your
instrument
is
200
pounds.
REV.
B,
MAR.
1977
7
System
Maintenance—TM
501
TROUBLESHOOTING
AID
Introduction
The
following
is
provided
to
augment
information
contained
elsewhere
in
this
and
other
TM
500
Series
family
manuals
when
troubleshooting
becomes
necessary.
Circuit
Descriptions
Each
manual
has
a
section
devoted
to
explaining
circuit
operating
theory.
Used
conjointly
with
the
schematics,
this
can
be
a
powerful
analytic
tool.
Diagrams
Block
diagrams
and
detailed
circuit
schematics
are
located
on
foldout
pages
in
the
service
section
of
most
of
the
TM
500
Series
family
manuals.
The
schematic
diagrams
show
the
component
values
and
assigned
circuit
reference
numbers
of
each
part
necessary
to
the
circuit
design.
Usually
the
first
page
of
the
service
sections
defines
the
circuit
symbols
and
reference
designators
used
in
that
particular
instrument.
Major
circuits
are
usually
identifiable
by
a
series
of
component
numbers.
Important
waveforms
and
voltages
may
be
shown
within
the
diagrams
or
on
adjoining
aprons.
Those
portions
of
the
circuits
located
on
circuit
boards
are
enclosed
with
a
blue
tint
outline.
Cam
Switch
Charts
Cam
switches
shown
on
the
diagrams
are
coded
in
comprehensive
charts
to
locate
the
cam
number
of
the
switch
contact
in
the
complete
switch
assembly,
counting
from
the
front,
or
knob
end,
toward
the
rear
of
the
switch.
The
charts
also
indicate
with
a
solid
dot
when
each
contact
is
closed.
Circuit
Board
Illustrations
Line
illustrations
showing
component
locations
keyed
with
a
grid
scheme
for
each
circuit
board
are
usually
placed
on
the
back
of
a
foldout
page
and
sequenced
as
close
as
possible
to
an
associated
schematic.
The
GRID
LOG
column
in
the
Electrical
Parts
Lists
keys
each
component
to
the
Location
illustrations.
Component
and
Wiring
Color
Codes
Colored
stripes
or
dots
on
electrical
components
signify
electrical
values,
tolerances,
etc.,
according
to
EIA
standards.
Components
not
color-coded
usually
have
information
printed
on
the
body.
The
wiring
coding
follows
the
same
EIA
standards
with
the
exception
of
the
AC
power
cord
of
the
Power
Modules.
It
is
coded
like
this;
Black
Line
White
Neutral
Green
with
a
Yellow
stripe
Safety
Earth
or
Ground
Testing
Equipment
Generally,
a
wide-band
oscilloscope,
a
probe,
and
a
multimeter
are
ail
that
is
needed
to
perform
basic
waveform
and
voltage
checks
for
diagnostic
purposes.
The
calibration
procedures
in
the
manual
for
each
plug-in
module
list
specific
test
equipment
and
the
features
necessary
to
adequately
check
out
that
particular
module.
TROUBLESHOOTING
TECHNIQUES
Introduction
This
troubleshooting
procedure
is
arranged
in
an
order
which
checks
the
simple
trouble
possibilities
before
proceeding
to
extensive
troubleshooting.
Control
Settings
Incorrect
control
settings
can
indicate
a
trouble
that
does
not
exist.
If
there
is
any
question
about
the
correct
function
or
operation
of
any
control,
see
the
Operating
Instructions
section
of
the
manual
for
the
instrument
involved.
System
and
Associated
Equipment
Before
proceeding
with
troubleshooting
the
TM
500
Series
system,
check
that
the
instruments
in
the
system
are
operating
correctly.
Check
for
proper
interconnection
between
the
power
module
and
the
plug-in
module.
Check
the
line
voltage
at
the
power
source.
Check
that
the
signal
is
properly
connected
and
that
the
interconnecting
cables
and
the
signal
source
are
not
defective.
The
associated
plug-in
modules
can
be
checked
for
proper
operation
quickly
by
substituting
other
like
units
known
to
be
operating
properly.
If
the
trouble
persists
after
substitution,
then
the
power
module
is
probably
at
fault.
8
System
Maintenance—TM
501
Visual
Check
Inspect
the
portion
of
the
system
in
which
the
trouble
is
suspected.
Many
troubles
can
be
located
by
visual
clues
such
as
unsoldered
connections,
broken
wires,
damaged
circuit
boards,
damaged
components,
etc.
Instrument
Calibration
Check
the
calibration
of
the
suspected
plug-in
module
or
the
affected
circuit
if
the
trouble
is
obviously
in
a
certain
circuit.
The
trouble
may
only
be
a
result
of
misadjustment
or
may
be
corrected
by
re-calibration.
Complete
calibration
instructions
are
given
in
the
manual
for
each
instrument
in
the
system.
Circuit
Isolation
Note
the
symptom.
It
often
identifies
the
circuit
in
which
the
trouble
is
located.
When
trouble
symptoms
appear
in
more
than
one
circuit,
check
the
affected
circuits
by
making
waveform
and
voltage
measurements.
Incorrect
operation
of
all
circuits
often
means
trouble
in
the
power
supplies.
Using
a
multimeter,
check
first
for
correct
voltages
of
the
individual
regulated
supplies
according
to
the
plug-in
module
schematics
and
calibration
procedures.
Then
check
the
unregulated
supplies
of
the
power
module.
Defective
components
elsewhere
in
the
instruments
can
appear
as
power
supply
problems.
In
these
instances,
suspected
circuits
should
be
disconnected
from
apparently
bad
power
supplies
one
at
a
time
to
narrow
the
search.
Voltages
and
Waveforms
Often
defective
components
can
be
located
by
using
waveform
and
voltage
indications
when
they
appear
on
the
schematic
or
in
the
calibration
procedures.
Such
waveforms
and
voltage
labels
are
typical
indications
and
will
vary
between
instruments.
To
obtain
operating
conditions
similar
to
those
used
to
take
these
readings,
refer
to
the
first
diagram
in
the
service
sections.
Component
Checking
If
a
component
cannot
be
disconnected
from
its
circuit,
then
the
effects
of
the
associated
circuitry
must
be
considered
when
evaluating
the
measurement.
Each
for
soldered-in
transistors
and
integrated
circuits
most
components
can
be
lifted
at
one
end
from
the
circuit
board.
Transistors
and
IC's.
Turn
the
power
switch
off
before
removing
or
replacing
any
semiconductor.
A
good
check
of
transistor
operation
is
actual
perform¬
ance
under
operating
conditions.
A
transistor
can
most
effectively
be
checked
by
substituting
a
new
component
for
it
(or
one
which
has
been
checked
previously).
However,
be
sure
that
circuit
conditions
are
not
such
that
a
replacement
transistor
might
also
be
damaged.
If
substitute
transistors
are
not
available,
use
a
dynamic
tester.
Static-type
testers
are
not
recommended,
since
they
do
not
check
operation
under
simulated
operating
conditions.
A
suction-type
desoldering
tool
must
be
used
to
remove
soidered-in
transistors;
see
component
replacement
procedure
for
details.
Integrated
circuits
can
be
checked
with
a
voltmeter,
test
oscilloscope,
or
by
direct
substitution.
A
good
under¬
standing
of
the
circuit
description
is
essential
to
trouble¬
shooting
circuits
using
IC's.
Operating
waveforms,
logic
levels,
and
other
operating
information
for
the
IC's
are
given
in
the
circuit
description
information
of
the
appro¬
priate
manual.
Use
care
when
checking
voltages
and
waveforms
around
the
IC's
so
that
adjacent
leads
are
not
shorted
together.
A
convenient
means
of
clipping
a
test
probe
to
the
14-
and
16-pin
in-line
IC’s
is
with
an
integrated-circuit
test
clip.
This
device
also
doubles
as
an
extraction
tool.
Diodes,
Do
not
use
an
ohmmeter
that
has
a
high
internal
current.
High
currents
may
damage
the
diode.
A
diode
may
be
checked
for
an
open
or
shorted
condition
by
measuring
the
resistance
between
terminals.
With
an
ohmmeter
scale
having
an
internal
source
of
between
800
mV
and
3
V,
the
resistance
should
be
very
high
in
one
direction
and
very
low
when
the
leads
are
reversed.
Resistors.
Check
the
resistors
with
an
ohmmeter.
Resis¬
tor
tolerances
are
given
in
the
Electrical
Parts
List
in
every
manual.
Resistors
do
not
normally
need
to
be
replaced
unless
the
measured
value
varies
widely
from
the
specified
value.
Capacitors.
A
leaky
or
shorted
capacitor
can
be
detected
by
checking
resistance
with
an
ohmmeter
on
the
highest
scale.
Use
an
ohmmeter
which
will
not
exceed
the
voltage
rating
of
the
capacitor.
The
resistance
reading
should
be
high
after
initial
charge
of
the
capacitor.
An
open
capacitor
can
best
be
detected
with
a
capacity
meter,
or
by
checking
whether
it
passes
AC
signals.
9
System
Maintenance—T!VI
501
PARTS
ORDERING
AND
REPLACING
Ordering
Standard
Parts.
All
electrical
and
mechanical
replace¬
ment
parts
can
be
obtained
through
the
local
TEKTRONIX
Field
Office
or
representative.
However,
many
of
the
standard
electronic
components
can
be
obtained
locally
in
less
time
than
is
required
to
order
them
from
Tektronix,
Inc.
Before
purchasing
or
ordering
replacement
parts,
check
the
Parts
Lists
for
value,
tolerance,
rating,
and
description.
When
selecting
replacement
parts,
it
is
important
to
remember
that
the
physical
size
and
shape
of
the
compo¬
nent
may
affect
its
performance
in
an
instrument.
All
replacement
parts
should
be
direct
replacements
unless
it
is
known
that
a
different
component
will
not
adversely
affect
the
instrument
performance.
Special
Parts.
Some
parts
are
manufactured
or
selected
by
Tektronix,
Inc.,
to
satisfy
particular
requirements,
or
are
manufactured
for
Tektronix,
Inc.,
to
our
specifications.
Most
of
the
mechanical
parts
used
in
this
system
have
been
manufactured
by
Tektronix,
Inc.
Order
all
special
parts
directly
from
the
local
TEKTRONIX
Field
Office
or
representative.
Ordering
Procedure.
When
ordering
replacement
parts
from
Tektronix,
Inc.,
please
include
the
following
mini¬
mum
information;
1.
I
n
strument
Type
(PS
501,
SG
502,
DC
501,
etc.)
2.
I
n
strument
Serial
Number
(For
example,
B010250)
3.
A
description
of
the
part
(if
electrical,
include
the
circuit
number)
4.
T
E
K
TRONIX
part
number
Please
do
not
return
any
instruments
or
parts
before
receiving
directions
from
Tektronix,
Inc.
A
listing
of
TEKTRONIX
Field
Offices,
Service
Centers,
and
Representatives
can
be
found
in
the
TEKTRONIX
Product
Catalog
and
Supplements.
Replacing
The
exploded
view
drawings
associated
with
the
Mechanical
Parts
Lists,
located
to
the
rear
of
most
manuals.
may
be
especially
helpful
when
disassembling
or
re¬
assembling
individual
components
or
sub-assemblies.
Circuit
Boards.
If
a
circuit
board
is
damaged
beyond
repair
the
entire
assembly
including
all
soldered-on
com¬
ponents,
can
be
replaced.
Part
numbers
are
given
in
the
mechanical
parts
list
for
the
completely
wired
(670
pre¬
fix)
board
(388
prefix).
To
remove
or
replace
a
board,
proceed
as
follows:
1.
Disconnect
all
leads
connected
to
the
board
(both
soldered
lead
connections
and
solderless
pin
connections).
2.
R
e
move
all
screws
holding
the
board
to
the
chassis
or
other
mounting
surface.
Some
boards
may
be
held
fast
by
plastic
mounting
clips
around
the
board
edges.
For
these,
push
the
mounting
clips
away
from
the
circuit
board
edges
to
free
the
board.
Also,
remove
any
knobs,
etc.,
that
would
prevent
the
board
from
being
lifted
out
of
the
instrument.
3.
L
i
ft
the
circuit
board
out
of
the
unit.
Do
not
force
or
bend
the
board.
4.
T
o
replace
the
board,
reverse
the
order
of
removal.
Use
care
when
replacing
pin
connectors;
if
forced
into
place
incorrectly
positioned,
the
pin
connectors
may
be
damaged.
Transistors
and
IC's.
Transistors
and
IC's
should
not
be
replaced
unless
they
are
actually
defective.
If
removed
from
their
sockets
during
routine
maintenance
return
them
to
their
original
sockets.
Unnecessary
replacement
or
switching
of
semiconductor
devices
may
affect
the
calibra¬
tion
of
the
instruments.
When
a
transistor
is
replaced,
check
the
operation
of
the
part
of
the
instrument
that
may
be
affected.
10
REV.
8,
DEC.
1974
System
Maintenance—TM
501
C/"'
T!
"''NE
i
.
I
rx'-
!l
i
1
?!
Hr
See
manufacturer's
specifications
sheet
Power
Transistors
eW
L.
“i
J
k
■■
I
L
w
i
II
u
c
r'
.^.
.
Plastic-Cased
Transistors
fi'l
)
:Vr
G%-
FET*s
Ml
E
E
C
Metal-Cosed
Transistors
fn
i
I
I
l|
1f1
■
wi
/iL
Pin
2
I
I
\
(Output)
I
•
\
I
I
Pin
1
I
\
(Input)
“l\
Pin
3
(Ground)
Pin
1
(Input)
pin
2
(Output)
Regulator
IC's
Heat
dissipator
(may
be
applied
to
some
metal-
cased
transistors)
Integrated
Circuits
Figure
2.
Semiconductor
device
lead
configurations
found
in
the
TM
500
family.
Replacement
semiconductors
should
be
of
the
original
type
or
a
direct
replacement.
Figure
2
shows
the
lead
configuration
of
the
semiconductors
used
in
this
instrument
system.
When
removing
soldered-in
transistors,
use
a
suction-type
de-soldering
tool
to
remove
the
solder
from
the
holes
in
the
circuit
board.
An
extracting
tool
should
be
used
to
remove
the
14-
and
16-pin
integrated
circuits
to
prevent
damage
to
the
pins.
This
tool
is
available
from
Tektronix,
Inc.
Order
TEKTRONIX
Part
No,
003-0619-00.
If
an
extracting
tool
is
not
available,
use
care
to
avoid
damaging
the
pins.
Pull
slowly
and
evenly
on
both
ends
of
the
1C.
Try
to
avoid
having
one
end
of
the
tC
disengage
from
the
socket
before
the
other
end.
To
replace
one
of
the
power
transistors
mounted
on
the
Power
Module
chassis
adjacent
to
the
interface
circuit
board,
first
unsolder
the
leads.
Then,
loosen
the
nuts
which
clamp
the
transistor
to
the
chassis.
Remove
the
defective
transistor.
When
replacing
the
transistor,
use
a
mica
washer
on
the
metal
tab
to
increase
heat
transfer
from
the
transistor
to
the
chassis.
REV.
B,
OCT.
1975
11
System
fVlaintenance—TM
501
Interconnecting
Pins.
To
replace
a
pin
which
is
mounted
on
a
circuit
board,
first
disconnect
any
pin
connectors.
Then,
unsolder
the
damaged
pin
and
pull
it
out
of
the
board
with
a
pair
of
pliers.
Be
careful
not
to
damage
the
wiring
on
the
board
with
too
much
heat.
Ream
out
the
hole
in
the
circuit
board
with
a
0.031-inch
drill.
Remove
the
ferrule
from
the
new
interconnecting
pin
and
press
the
new
pin
into
the
hole
in
the
circuit
board.
Position
the
pin
in
the
same
manner
as
the
old
pin.
If
the
old
pin
was
bent
at
an
angle
to
mate
with
a
connector,
bend
the
new
pin
to
match
the
associated
pins.
NOTE
A
pin
replacement
kit
including
necessary
tools,
instructions,
and
replacement
pins
is
available
from
Tektronix,
Inc.
Order
TEKTRONIX
Part
No.
040-0542-00.
Cam
Switches.
Repair
of
cam-type
switches
should
be
undertaken
only
by
experienced
maintenance
personnel.
Switch
alignment
and
spring
tension
of
the
contacts
must
be
carefully
maintained
for
proper
operation
of
the
switch.
For
assistance,
contact
your
local
TEKTRONIX
Field
Office
or
representative.
NOTE
A
cam-type
switch
repair
kit
including
necessary
tools,
instructions,
and
replacement
contacts
is
avail¬
able
from
Tektronix,
Inc.
Order
TEKTRONIX
Part
No.
040-0541-00.
The
cam-type
switches
consist
of
rotating
cam
drums
which
are
turned
by
front-panel
knobs,
and
sets
of
spring-leaf
contacts
mounted
on
adjacent
circuit
boards.
The
contacts
are
actuated
by
lobes
on
the
cams.
These
switches
can
be
disassembled
for
inspection,
cleaning,
repair,
or
replacement
as
follows:
1.
R
e
move
the
screws
which
hold
the
metal
cover
on
the
switch,
and
lift
the
cover
off
the
switch.
The
switch
is
now
open
for
inspection
or
cleaning.
2.
To
completely
remove
a
switch
from
the
circuit
board,
first
remove
any
knobs
or
shaft
extensions.
Loosen
the
coupling
at
the
potentiometer
at
the
rear
of
the
switch,
and
pull
the
long
shaft
out
of
the
switch
assembly.
3.
Remove
the
screws
(from
the
opposite
side
of
the
circuit
board)
which
hold
the
cam
drum
to
the
board.
4.
To
remove
the
cam
drum
from
the
front
support
block,
remove
the
retaining
ring
from
the
shaft
on
the
front
of
the
switch
and
slide
the
cam
drum
out
of
the
support
block.
Be
careful
not
to
lose
the
small
detent
roller.
5.
To
replace
defective
switch
contacts,
follow
the
instructions
given
in
the
switch
repair
kit.
6.
To
re-install
the
switch
assembly,
reverse
the
above
procedure.
Pushbutton
Switches.
The
pushbutton
switches
are
not
repairable
and
should
be
replaced
as
a
unit
if
defective.
Use
a
suction-type
de-soldering
tool
to
remove
solder
from
the
circuit
board
when
removing
these
switches.
Incandescent
Bulbs.
Most
of
these
light
bulbs
are
mounted
on
the
sub-panel
using
plastic
sleeve
stand-offs.
Unsolder
the
lead
wires
and
pull
the
bulb
out
of
the
sleeve
from
the
rear
of
the
sub-panel.
Light-Emitting
Diodes.
LED's
used
as
indicators
are
mounted
on
the
sub-panels
with
plastic
sleeve
sockets
similar
to
the
incandescent
bulb
mountings
or
they
are
soldered
directly
to
a
sub-assembly
and
so
mounted
that
they
protrude
through
holes
in
the
panel.
In
these
cases,
the
sub-assembly
must
be
exposed
and
the
anode
and
cathode
lead
orientations
carefully
noted
before
unsoldering
the
defective
LED,
See
Figure
3
for
LED
lead
identifying
information.
12
System
Maintenance—TM
501
Power
Transformer.
Replace
the
transformer
only
with
a
TEKTRONIX
direct
replacement
transformer.
Refer
to
the
exploded
view
drawing
at
the
rear
of
the
Power
Module
manuals
for
disassembly
of
the
rear
panel
to
expose
the
power
transformer.
Refer
to
the
schematic
diagram
color¬
coding
information
for
correct
wiring.
After
replacement,
check
out
the
power
supply
voltages
before
installing
a
plug-in
module.
13
TM
501
SEVICE
INFORMATION
IRCUIT
BOAI
Symbols
and
Reference
Designators
Electrical
components
shown
on
the
diagrams
are
in
the
following
units
unless
noted
otherwise:
Capacitors
=
Values
one
or
greater
are
in
picofarads
(pF).
Values
less
than
one
are
in
microfarads
(juF).
Resistors
=
Ohms
(12).
Graphic
symbols
and
class
designation
letters
are
based
on
ANSI
Standard
Y32.2-1975.
Logic
symbology
is
based
on
ANSI
Y32.14-1973
in
terms
of
positive
logic.
Logic
symbols
depict
the
logic
function
performed
and
may
differ
from
the
manufacturer's
data.
The
overline
on
a
signal
name
Indicates
that
the
signal
performs
its
intended
function
when
it
goes
to
the
low
state.
Abbreviations
are
based
on
ANSI
Y1.1-1972.
Other
ANSI
standards
that
are
used
in
the
preparation
of
diagrams
by
Tektronix,
Inc.
are:
Y14.15,
1966
Drafting
Practices.
Y14.2,
1973
Line
Conventions
and
Lettering.
Y10.5,
1968
Letter
Symbols
for
Quantities
Used
in
Electrical
Science
and
Electrical
Engineering.
The
following
prefix
letters
are
used
as
reference
designators
to
identify
components
or
assemblies
on
the
diagrams.
A
Assembly,
separable
or
repairable
(circuit
board,
etc)
AT
Attenuator,
fixed
or
variabie
B
Motor
BT
Battery
C
Capacitor,
fixed
or
variable
CB
Circuit
breaker
CR
Diode,
signal
or
rectifier
DL
Delay
tine
DS
Indicating
device
(tamp)
E
Spark
Gap,
Ferrite
bead
F
Fuse
FL
Filter
Heat
dissipating
device
(heat
sink,
heat
radiator,
etc)
Heater
Connector,
stationary
portion
Relay
Inductor,
fixed
or
variable
Meter
Connector,
movable
portion
Transistor
or
silicon-controlled
rectifier
Resistor,
fixed
or
variabie
Thermistor
The
following
special
symbols
may
appear
on
the
diagrams:
Strap
or
Link
Cam
Switch
Closure
Chart
(Dot
indicates
switch
closure)
SEL
Value
Selected
at
Factory
Test
Voltage
Internal
Screwdriver
*
Adjustment
Functional
Block
Outline
Assembly
Number
Board
Name«»^_
Switch
or
contactor
Transformer
Thermocouple
Test
point
Assembly,
inseparable
or
non-repairabie
(integrated
circuit,
etc.)
Electron
tube
Voltage
regulator
(zener
diode,
etc.)
Wirestrap
or
cable
Crystal
Phase
shifter
Plug
to
E.C.
Board
iBoxI
Identifies
Panel
Controls.
Connectors
and
Indicators
Modified
Component—See
Parts
List
(Depicted
in
grey,
or
with
grey
outline)
Plug
Index
Refer
to
Waveform
Refer
to
Diagram
Number
Coaxial
Connector
Shielding
Heat
Sink
Decoupled
or
Filtered
Voltage
Etched
Circuit
Board
Outlined
in
Black
Schematic
Name
VERTlCAvL
AMPLIFIER
a
nd
Number
REV
B,
APR
1979
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