Tektronix 465B - Page 231

465B
Service
DIAGRAMS AND
CIRCUIT BOARD ILLUSTRATIONS
Symbols
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 manufac-
turer’s data
The overline
on a signal
name indicates
that the signal
performs
its
intended
function
when it is in 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.
American
National Standard
Institute
1430 Broadway
New York,
New York
10018
Component Values
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
(aF).
Resistors
=
Ohms (O).
Assembly Numbers and Grid
Coordinates
Each
assembly
in the
instrument
is
assigned an
assembly
number
(eg., A20).
The assembly
number
appears on the circuit board outline on the diagram, in the
title for the circuit board component location illustration,
and in the
lookup table
for the
schematic diagram and
corresponding component locator illustration. The
Replaceable Electrical
Parts
list is arranged by assemblies
in
numerical sequence,
the
components are listed
by
component number
(see
following illustration for
constructing a component number).
COMPONENT
NUMBER EXAMPLE
Component Number
A23 A2
R1234
Assembly
Numb*'
Huron
it inn
Sc/wnuitt
—
- Cscirt
Number
Chassis mounted
components have no Assembly fejr-bt<
pren.—
e»d %i RcpUiecttc OcvU*d
P.U 1*1
The schematic diagram and circuit board component
location illustration have grids A lookup table with the
grid coordinates
is
provided
for ease of locating the
component.
Only the com ponents ill ustrated on the facing
diagram are listed
in
the
lookup table. When more than
one schematic
diagram
is used to illustrate the
circuitry on
a circuit board,
the circuit hoard
illustration
may only
appear opposite the first diagram
on which
it was
Il-
lustrated; the lookup table will
list
the
diagram number of
other diagrams
that the circuitry of the
circuit
board
appears
on.
The following
special
symbols may eppear on the diagrams:
B
Function
Block Title
Internal
Screwdriver
AcEustment
Cam Switch
Closure Chart
(Dot indicates
switch
closure)
Etched Circuit Board
Outlined in Black
nctcr
to
waveform
Function
Block
Outline
1C type
Tea
Voltaoe
Heat
Sink
Board Name
P/O-Part ot
circuit hoard
Assembly Number
Tektronix Part
No
tor
circuit boards
O70-XXXX-XX
rssb
<3>
•»
SYNC GENERATOR
<
8
>
Modified Component So©
Paris Ust (Depicted
in grey,
or with grey outline)
Strap or Unk
Plug
to E.C
Board
I Bo»
I
-
Identities Panel
Controls
Connectors and
Indicators
Coaxial
connectors
male
female
Rug Index, signifies pin No 1
External screwonver
Adjustment
Shielding
Selected
value,
see
Pans
List
Decoupled or Filtered
Voltage
Reter lo
Diagram Number
Schematic Name
and
Number
SHVbuVia