Tektronix 5103N

System
Maintenance—
51 03N
Semiconductor
Lead
Configuration.
Fig.
4-1
shows the
lead
configuration
of the
semiconductor
devices
used in this
instrument.
Multi-Connector
Holders.
The
multi-connector
holder
is
keyed
with two
triangles,
one
on
the
holder and
one on
the
circuit
board.
When a
connection
is
made
perpendicular to
a
circuit
board
surface,
the
orientation
of the
triangle
and
the
slot
numbers
on
the
connector
holder is
determined
by
the
direction
of the
nomenclature
marking (see
Fig.
4-2).
Troubleshooting
Equipment
The
following
equipment
is
useful
for
troubleshooting
the
5100-Series
Oscilloscope
and its
plug-in units:
1.
Semiconductor
Tester
Description:
Dynamic-type
tester.
Purpose:
To
test
the
semiconductors
used
in this in-
strument
system.
Recommended
type:
Tektronix
Type
576
Transistor
Curve T
racer
or
equivalent.
2.
Multimeter
Description:
VTVM,
10-megohm
input
impedance
and 0
to 300
volts
range,
AC
and DC;
ohmmeter, 0
to
50
megohms.
Accuracy,
within 3%.
Test
probes
must be
insulated
to
prevent
accidental
shorting.
Purpose: To
check
voltages
and for
general
trouble-
shooting
in
this
instrument
system.
NOTE
A 20,000
ohms/volt
VOM
can
be
used
to
check the
voltages
in this
instrument
if allowances
are
made
for the
circuit
loading
of the
VOM
at
high-
impedance points.
3.
Test
Oscilloscope
Description:
Frequency
response,
DC to 2
megahertz
minimum;
deflection
factor,
1
millivolt/division to
5
volts/division. A
10X,
10-megohm
voltage
probe
should be
used to
reduce
circuit
loading for
voltage
measurements.
Fig.
4-2. Multi-connector
holder
orientation.
Troubleshooting
Techniques
This troubleshooting
procedure
is
arranged
in an
order
which checks the simple trouble
possibilities before pro-
ceeding with extensive
troubleshooting. When a defective
component is
located,
it
should be replaced
following
the
replacement
procedure given under Component Replace-
ment.
1.
Check
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.
2.
Check
System and
Associated
Equipment.
Before
proceeding
with
troubleshooting
of the 5100
system,
check
that the
instruments in
the system are
operating
correctly.
Check for proper
interconnection
between the
display
unit
and the
power
supply/amplifier unit.
Check
that the
signal
is
properly
connected
and that
the
interconnecting
cables
or
signal source
are
not defective.
Also,
check the
power
source. The
associated
plug-in
units
can
be
checked
for
proper
operation
by
substituting
other units
which are
known to
be
operating
properly
(preferably of the
same
types),
or by
interchanging
plug-in units
within
the
5103N.
If the
trouble
persists
after
substitution,
the
oscilloscope
mainframe is
probably at
fault.
3. Visual
Check.
Visually
check the portion
of
the
in-
strument in
which the trouble is
suspected. Many
troubles
can be
located by
visual indications
such as unsoldered
con-
nections,
broken wires,
damaged circuit
board, damaged
components, etc.
Purpose:
To
check
operating
waveforms in this
instrument.
4-3