Tektronix 11A52 Service Manual page 105

11A52 Extended Service-Section 6
Schematic Diagrams and Circuit Board Illustrations
Symbols
Graphic symbols and class designation letters are based
on ANSI Standard Y322-1975.
Logic symbology is based on ANSI/IEEE Std 91-1984 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 is in the low state.
Abbrev.iations are based on ANSI Yl .1-1972.
Other ANSI standards that are used in the preparation of
diagrams by Tektronix, Inc. are:
Y14.15, 1966
Y14.2, 1973
Yl0.5, 1968
Drafting Practices.
Line Conventions and Lettering.
Letter Symbols for Quantities Used in
Electrical Science and Electrical
Engineering.
American National Standard Institute
1430 Broadway
NewYork,NewYork 10018
Component Values
Electrical components shown on the diagrams are in the
following units unless noted otherwise:
Capacitors=
Resistors=
Values one or greater are in picofarads
(pF). Values less than one are in
microfarads (µF).
Ohms(Q).
The information and special symbols below may appear in this manual.
Assembly Numbers and Grid Coordinates
Each assembly in the instrument is assigned an assembly
number (e.g., 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.
8
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 components illustrated 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 board illustration
may only appear opposite the first diagram on which it was
illustrated; the lookup table will list the diagram number of
other diagrams that the circuitry of the circuit board
appears on.
c
_,.....,....,....,,_....,,,_ ___________________
,i,,-•------P~~!J.~~ 8 iomponent-See
Funor.ton Block Tlfle
--+-+-----------
Internal Screwdrlver
AdJustment
---+----"'
Test Vol tags
2
U145A
7'1LS123
Onboard Jumper - - - - - - - - - - - - /
Etched CJ.rcuJ. t Board
Outllne
SEE PARTS LIST FOR
SEl1ICONDUCTOR TYPES
. , . . - - - - - - S t r a p or Dummy ReeJator
-
+15V
' - - - - - - - 1 - - - - - - - - o e c o u p l e d Voltage
' - - - - - - - - - - 1 1 - - - - - - - H e o t
Slnk
As
. .
,,,--Schematlc Number
i.....~~~~~~~~~~~~,t...~~~~...J.~P~AR~T~IA~L,L.l.:;~T~IM~I~NGWB~OA~RD2.J ~
Refer To
D~~2:;:~
- - - - - - - - - - - - - - - - - "
SYNC GENERA TOR~