Tektronix 221, Инструкция по эксплуатации

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221 Service
DIAGRAMS
AND
CIRCUIT BOARD ILLUSTRATIONS
Symbols and Reference Designators
E lectrical com ponents shown on the diagrams are in th e fo llo w in g u nits unless noted otherw ise:
C apacitors = Values one o r greater are in picofarads (pF ).
Values less than one are in m icrofarads (pF ).
Resistors = Ohms (fil).
Sym bols used on th e diagrams are based on U SA Standard Y 32.2-1967.
Logic sym bology is based on M IL-S T D -80 6B in term s o f p ositive logic. Logic sym bols d e p ic t the logic fu n c tio n perform ed
and may d iffe r fro m the m anufacturer's data.
The fo llo w in g p re fix letters are used as reference designators to id e n tify com ponents or assemblies on th e diagrams.
A
Assembly, separable or repairable H H eat dissipating device (heat sink.
R T
Therm isto r
(circ u it board, etc.) heat radiator, etc.) S
Sw itch
A T A tte n u a to r, fixe d or variable HR Heater T
T ransform er
B M o to r H Y
H y b rid circuit
TC
T herm ocouple
B T Battery
J C onnector, stationary p ortio n TP Test p o in t
C Capacitor, fixe d or variable K
Relay U Assembly, inseparable or non-repairable
CB C irc u it breaker
L In d u c to r, fixed or variable
(integrated circ u it, etc.)
CR D iode, signal or rectifier LR 1 nductor/resistor com bination V
Electron tube
D L Delay line M M eter
V R Voltage regulator (zener d iode, etc.)
DS Indicating device (lam p) P C onnector, movable portion
Y
Crystal
E
Spark Gap Q
Transistor or silicon-controlled Z Phase shifter
F
F use
rectifier
F L
F ilte r R Resistor, fixed or variable