Tektronix 1705A Diagrams/Circuit Board Illustrations, Symbols, Component Values, Assembly Numbers

Diagrams/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 manufacturer’s data.

Overline, parenthesis, or leading slash indicate a low asserting state.

Example: ID CONTROL, (ID CONTROL), or /ID CONTROL.

The Replaceable Electrical Parts List is arranged by assembly number in numerical sequence; the components are listed by component number. Example:

Component Number			Chassis-mounted components
A23	A2	R1234	have no Assembly No. prefix.
			See end of Replaceable Electrical
			Parts List
Assembly		Subassembly	Schematic Circuit
Number		Number (if used)
			Number

Abbreviations are based on ANSI Y1.1-1972. Grid Coordinates

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

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 will only appear opposite the first diagram; the lookup table will list the diagram number of other diagrams that the other circuitry appears on.

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 (￿F).

Resistors = Ohms (Ω).

The following information and special symbols may appear in this manual.

Assembly Numbers

REAR

PANEL

INPUT

BNC (FEMALE)

				DECOUPLED OR
			FILTERED VOLTAGE		CHANGED		PLUG
					PART			WIRE STRAP
				IC TYPE					MODULE
				+12V
		+12V3							PORTS
					P1				NEGATIVE
	R5	7		R500	J1		TP1
J1	1.0		U1	20K		1 2 3		W4	(VIDEO)	R100
	2		741			NC		0 OHM
			6
	3								/VIDEO	2
					REFER TO
	C1				WAVEFORM		2
PAD	10UF	4
				FRONT PANEL
		---12V
				NOMENCLATURE				CLOCKWISE		HEAT SINK
							+11.8V		+15V
								AJUSTMENT
								R55	H	SEE PARTS LIST
							R4	100.0		FOR SELECTION
					ROTATE				Q8	CRITERIA
							20K
					SCREWDRIVER					R85	J3
	BASE DRIVE						---11.8V			SEL
					ADJUSTMENT						2
	& SNUBBER										1
								R56
								100.0
	FUNCTION BLOCK								Q6
	TITLE						C27
							0.1UF
									---15V
	CIRCUIT BOARD								SEE PARTS LIST FOR
	OUTLINE								EARLIER VALUES AND
									SERIAL NUMBER RANGES.

PART OF A1 MAIN BOARD

PART NAME,

SCHEMATIC &

BOARD REF

W751

12

A3

ANALOG

BOARD

SQUARE PIN

CONNECTOR

Each assembly in the instrument is assigned an assembly number (e.g., A20). The assembly number appears on the diagram (in circuit board outline), circuit board illustra- tion title, and lookup table for the schematic diagram.

INSTRUMENT NAME	VERTICAL INPUT		A1	1
	SCHEMATIC NAME & NUMBER	ASSEMBLY NUMBER

COMPONENT LOCATOR GRID

1705A 9- 1