Maintenance—7D14
cuits
so that adjacent leads are not shorted
together. An
integrated-circuit
test
clip
provides a convenient means of
clipping a test probe to
the 14-
and 16-pin integrated cir
cuits.
This
device also
doubles as an integrated-circuit
extraction
tool.
B.
DIODES:
A diode
can 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
millivolts and 3 volts, the resistance should
be very
high
in one direction
and very low when the leads
are
reversed.
component
may affect its performance in the instru
ment.
All 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 indi
cated
in the
parts list by
an asterisk preceding the part
number. Most
of the mechanical
parts used in this instru
ment
have been manufactured by Tektronix. Order
all
special
parts directly from
your local Tektronix Field
Office or representative.
Do
not
use an ohmmeter scale that has a high internal
current.
High currents may damage the diodes.
C.
RESISTORS. Check
resistors with an ohmmeter.
Resistor
tolerance
is
given in the Electrical Parts List.
Resis
tors normally
do not need
to be replaced unless the meas
ured
value varies widely from the specified value.
D. 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 capacitance
meter, or
by
checking
whether the capacitor passes AC signals.
7.
Repair and Readjust the Circuit.
Special
techniques
required to
replace components
in this unit are given under
Component
Replacement.
Be sure to check the perform
ance
of
any
circuit that
has been
repaired or that has had
any electrical components
replaced. Recalibration of
the
affected circuit
may be necessary.
REPLACEMENT
PARTS
Standard
Parts
All
electrical and mechanical part replacements for the
7D14
can
be obtained
through your 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
list
for value,
tolerance, rating, and description.
NOTE
When selecting
replacement parts, it is important to
remember
that the physical size
and shape of the
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 the Elec
trical
Parts List section. Include the following information:
1.
Instrument
type (7D14)
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
Mechanical
Parts List may be helpful when disassembling or
re-assembling individual components
or sub-assemblies.
Circuit
Board
Replacement
In
general,
the circuit boards
used in the
7D14 need
never
be
removed
unless they must be replaced. Electrical
connections
to
the boards
are made by multiple-pin connec
tors
(multi-pin connectors) and interconnecting pins. If it is
necessary
to replace a
circuit board assembly, use the
following
procedure.
A. HIGH
FREQUENCY
COUNTER CIRCUIT BOARD
REPLACEMENT.
1.
Disconnect
the two
multi-pin connectors from the
circuit
board.
2.
Remove all the
screws
holding the
board to
the chassis
or
other
mounting surface.
4-4
Summary of Contents for 7D14
Page 4: ...7D14 ...
Page 11: ...Operating Instructions 7D14 Fig 2 1 7D14 front panel controls and connectors 2 2 ...
Page 33: ... 3 13 Fig 3 11 Logic diagram for Zero Cancel Logic stage Circuit Description 7D14 ...
Page 38: ...3 18 Fig 3 16 Time Base and Control circuit detailed block diagram Circuit Description 7D14 ...
Page 44: ...NOTES ...
Page 46: ...NJ Fig 4 1 Electrode configuration for semiconductors in this instrument I ...
Page 68: ...NOTES ...
Page 96: ... 7DI 4 DIGITAL COUNTER UNIT ...
Page 98: ...GRS 0371 BLOCK DIAGRAM ...
Page 99: ......
Page 103: ...0 0 I 200 mV 500 µs 0 001 200 mV 500 µs 0 001 MHz 00 mV E 00 µs 0 001 MHz ...
Page 106: ...1 ...
Page 110: ...A2 Logic Circuit Board Assembly jQ798i 798 jc743 CR744t uni R724 R742 JL744S FrR796 ...
Page 113: ......
Page 114: ...P 0 A2 LOGIC BOARD ...
Page 121: ... A B D t F H J NPR Tj ZWX V A AC M AEA HUM qAZ DEF HJ N P R S T J V V7X y ABM APAI AA 7DI4 ...
Page 129: ......
Page 130: ...4 7D14 DIGITAL COUNTER ...