Tektronix 5103N

System
Maintenance—51
03N
C. RESISTORS
Check the
resistors
with
an
ohmmeter. Resistor toler-
ance
is given in
the
Electrical
Parts List. Resistors normally
do not
need
to
be
replaced
unless the
measured value varies
widely
from the
specified
value.
D.
CAPACITORS
A
leaky or
shorted
capacitor can
be detected by
check-
ing
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
capacitance meter,
or
by
checking
whether the
capacitor passes
AC signals.
8.
Repair and
Readjust the Circuit. Special techniques
required to replace
the components
in this
unit
are given
under Component
Replacement. Be
sure to check the per-
formance of
any
circuit
that has been repaired or that has
had
any
electrical
components replaced. Calibration of the
affected circuit may
be necessary.
REPLACEMENT PARTS
Standard Parts
All electrical and
mechanical part replacements for
the
5100-series oscilloscope
system can be obtained through
your local
Tektronix Field Office or representative. How-
ever, 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 replace-
ment parts,
check
the
parts lists for value,
tolerance, rating,
and description.
NOTE
When selecting replacement parts, it is important
to
remember that the
physical size
and shape
of
the
component may
affect its performance
in the instru-
ment. AH
replacement parts should be direct replace-
ments 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
to
satisfy
particular
requirements, or are
manufactured
for
Tektronix to
our
specifications. These special
parts are
indicated in
the parts
list by an
asterisk preceding the part
number.
Most of the
mechanical parts used
in this system
have been manufactured
by Tektronix. Order all special
parts directly
from your
local
Tektronix Field Office or
representative.
Ordering
Parts
When
ordering
replacement parts from Tektronix,
Inc.,
refer to the Parts Ordering
Information and
Special Notes
and Symbols on the
page
immediately
preceding
each elec-
trical parts list section. Include
the
following
information:
1
.
Instrument
Type
(5103N, DIO,
5A15N, etc.)
2. Instrument Serial Number
3. A description of the part (if electrical,
include the
circuit number)
4.
Tektronix Part Number
COMPONENT
REPLACEMENT
General
The
exploded-view
drawings
associated with the mech-
anical
parts lists
(pullout
pages) may be
helpful when
disassembling
or
re-assembling individual components or
sub-assemblies.
Circuit
Board Replacement
If
a circuit
board is damaged beyond repair, either the
entire assembly including all soldered-on components, or
the board only, can be replaced.
Part
numbers are given in
the mechanical parts lists for either the completely
wired
(670
prefix) or the
unwired board
(388
prefix).
NOTE
Even though unwired
boards are available without
components, use of the completely
wired replace-
ment board is recommended due to the large number
of
components mounted on most of the
boards.
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.
Remove 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
example,
the
H.V.
board
in the
display modules).
For these,
push the
mounting clips
away from the circuit board edges to free
the board. Also,
remove any
knobs,
etc., that
would pre-
vent the
board from being lifted out
of
the
instrument.
3.
Lift the
circuit board out
of
the unit. Do not
force or
bend the
board.