Tektronix PG 501 Instruction Manual page 23

DIAGRAMS AND CIRCUIT BOARD ILLUSTRATIONS
Symbols and Reference Designators
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 I~F) .
Resistors =
Ohms (SZ) .
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 manufacturer's data .
The overline on a signal name indicates that the signal performs its intended function when it goes to 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 .
The following prefix letters are used as reference designators to identify components or assemblies on the diagrams .
A Assembly, separable or repairable
H
Heat dissipating device (heat sink, S
Switch or contactor
(circuit board, etc)
heat radiator, etc)
T Transformer
AT
Attenuator, fixed or variable HR Heater
TC
Thermocouple
8 Motor
HY Hybrid circuit
TP
Test point
BT Battery
J
Connector, stationary portion U
Assembly, inseparable or non-repairable
C
Capacitor, fixed or variable K
Relay
(integrated circuit, etc.)
CB Circuit breaker
L
Inductor, fixed or variable
V Electron tube
CR
Diode, signal or rectifier M
Meter VR
Voltage regulator (zener diode, etc .)
DL
Delay line
P Connector, movable portion
W Wirestrap or cable
DS
Indicating device (lamp)
o
Transistor or silicon-controlled
Y Crystal
E Spark Gap, ferrite bead
rectifier
Z
Phase shifter
F Fuse
R
Resistor, fixed or variable
FL Filter
RT Thermistor
Plug to E .C. Board
The following special symbols may appear on the diagrams :
Strap or Link
Servicing Information-PG 501
Box
Identifies Panel
PI5
Controls, Connectors and
gAL.
Indicators
5
't'12V-~/'f
2I
Modified Component-See
~ I~ R15
Parts List(Depicted in grey,
or with grey outline)
Cam Switch
Closure Chart
(Dot indicates
switch closure)
~
2~
mV
W16
' I
50K
5oJ
2v
-12V ---j
IJ
SEL Value Selected 3
~'I
at Factory
R14
Refer to Waveform
SEL
+12V I
Plug Index
_ TP12
I
To
J DIAL
r
Refer to Diagram Number
4
Test Voltage,® J
13 ! P 3 _
_
J14
Internal
Screwdriver
Adjustment
RIO ~ i
Assembly Number
100
AMPL. H -12V3
Board Name
REV . A MAY 1977
ARTIA 1 VERT)CAl_ BOARD
VERTICAL AMPLIFIER
Coaxial Connector
Shielding
Heat Sink
Decoupled or Filtered
Voltage
Etched Circuit Board
Outlined in Black
Schematic Name
and Number