Section 6-7M 1 3
D I A G R A M S A N D C I R C U I T B O A R D I LLU ST R AT I O N S
Symbols and Reference Designators
E lectrical com ponents shown on the d iagrams are in the fol lowing units u nless noted otherwise :
Capacitors
=
Val ues one or greater are in picofarad s ( pF
I .
Values less than one are i n m icrofarads
(pF ) .
Resistors
=
Ohms
(n)
Symbols used o n t he diagrams are based o n
USA
Standard
Y32.2-1 970.
Logic symbo logy is based on MI
L -STD-80SB
i n terms of posit ive logic. Logic symbols depict the log ic funct ion performed
and may d iffer from the manufacturer' s data .
The follow ing special symbols are used on the d iagrams:
E x ternal Screwdriver adjustment.
E x ternal contro l or connector .
Coax connector with grounded shield_
R efer to d iagram n u m ber i nd i cated i n d iamond .
Refer to waveform n u mber i nd i cated i n h exagon .
.-----
Connection soldered to circu it board .
�
Conn"bon m"'.
10
c ;"u ;1 bo"d w ; lh ; nwconn.cl ; n, p;n.
-.-...------
B lue tint enc loses com ponents located on c i rcu it board .
Designates part of a complete circui t
board.
The fo l l owing pref i x letters are used as reference designators to identify components or assem b l ies on the diagrams.
A
Assem b l y , separab le or repairable (circu it board , etc.!
AT
Attenuator, f ixed or variab le
B
Motor
BT
Battery
C
Capacito r , fixed or variable
C R
D iode, signal or rectifier
DL
Delay line
OS
I nd icating device ( lamp)
F
F u se
F L
F ilter
H
Heat d issipating device ( heat sink , heat rad iator, etc . 1
H R Heater
J
Connector, stationary portion
K
Relay
L
I nd uctor, fixed or variable
6-1
L
R
I nd uctor Iresi stor combination
M
Meter
o
Transistor or si l icon-contro l l ed rectif ier
P
Connector , movab le portion
R
R esistor, fixed or variab le
AT
T herm istor
S
Sw itch
T
T ransformer
TP
T
est point
U
Assemb ly, i nseparable or non-repairable (integrated
c i rcu it, etc . )
V
E lectron tube
V R Voltage regu lator ( zener d iode, etc. 1
Y
Crysta l
CW
Oockwise control rotation