Tektronix 7623 User manual

STORAGE

SCILLOSCOPE

SERVICE

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SECTION



CALIBRATION

CONTENTS

SECTION



OPERATING

INFORMATION



Page

Operating

Voltage



1-1

Operating

Temperature



1-1

Plug-In

Installation

And

Removal



1-1

Operation



1-1

Non-Store

Operating

Set-Up

Information



1-1

Front

Panel

Controls

And

Connectors



1-2

Rear

Panel

Controls

And

Connectors



1-3

Storage

Modes



1-4

Variable

Persistence

Operating

Set-Up

Information



1-4

Fast

Operating

Set-Up

Information



1-4

Multi-Trace

Fast

Operating Set-Up

Information



1-4

Bi-Stable

Operating

Set-Up

Information



1-4

Save

Mode

Operating

Set-Up

Information



1-4

Calibration

Interval



2-1

Tektronix

Field

Service



2-1

Using

This

Procedure



2-1

General



2-1

Index



2-1

Performance



2-1

Partial

Procedure



2-1

Complete

Calibration

Procedure



2-1

TEST

EQUIPMENT

REQUIRED

Special

Calibration

Fixtures



2-1

Calibration

Equipment

Alternatives



2-1

Test

Equipment



2-2

Preliminary

Control

Settings



2-4

CALIBRATION

PROCEDURE



2-5

Introduction



2-5

Index

Calibration

Procedure



2-5

Power

Supply



2-5

Display

And

Z-Axis



2-5

Vertical

Deflection

System



2-5

Trigger

System



2-5

Horizontal

Deflection

System



2-5

Z-Axis

And

Auto

Focus



2-5

Calibrator



2-5

Signals

Out



2-5

Readout

Operation



2-6

Storage

Operation



2-6

7623/R7623

Service

7623/R7623

Service

CONTENTS

(cont)

SECTION

CIRCUIT

DESCRIPTION

Page

Block

Diagram

3-1

Circuit

Operation

3-1

Logic

Fundamentals

3-3

Symbols

3-3

Logic

Polarity

3-3

Input/Output

Tables

3-6

Non-Digital

Devices

3-6

MAIN

INTERFACE

3-6

LOGIC

CIRCUIT

3-6

Logic

Block

Diagram

3-6

Z-Axis

Logic

3-6

Clock Generator

3-9

Vertical

Chopped

Blanking

3-10

Chop

Counter

3-11

Vertical

Mode

Control

3-13

Right

3-13

Chop

3-13

Alt 3-14

Add

3-14

Left

3-14

Vertical

Binary

3-14

Plug-In

Binary

3-15

Output

Buffers

3-16

TRIGGER

SELECTOR

3-16

Trigger

Mode

And

Add

Signals

3-16

General

3-16

Vert

Mode

3-16

Left

3-16

Right

3-18

Trigger

Channel

Switch

3-18

Trigger

Output

Amplifier

3-18

Vertical

Signal

Buffer

3-18

VERTICAL INTERFACE

3-19

Vertical

Channel

Switch 3-19

Auxiliary

Y-Axis

Input

Amplifier

3-20

Delay

Line

Buffer

3-20

Delay

Line

3-20

VERTICAL

AMPLIFIER

3-20

Input

Balance

3-21

Output

Amplifier

3-21

Beam

Finder

Network

3-21

HORIZONTAL

AMPLIFIER

3-21

Horizontal

Channel Switch

3-21

Right

Output

Amplifier

3-22

Left

Output

Amplifier

3-22

CONTENTS

(cont)

SECTION



CIRCUIT

DESCRIPTION

(cont)



Page

7623/137623

Service

CALIBRATOR

And

FRONT

PANEL

SWITCHING

3-22

Mode

Switch

Logic

3-23

Calibrator

3-23

Oscillator

3-23

Output

Amplifier

3-23

Output

Divider

3-23

CRT

CIRCUIT

3-24

Z-Axis

Amplifier

3-24

Auto

Focus

Amplifier

3-25

High

Voltage

Oscillator

3-25

High

Voltage

Regulator

3-25

High

Voltage

Supplies

3-26

CRT

Control

Circuits

3-26

LOW-VOLTAGE

POWER

SUPPLY

3-27

Power

Input 3-27

-50

Volt

Supply

3-27

-15

Volt

Supply

3-30

Volt

Supply 3-30

+15

Volt Supply 3-30

+50

Volt Supply 3-30

+130

Volt

Supply

3-31

Graticule

Light

Supply

3-31

SIGNAL

OUT

BOARD

3-31

Vert

Sig

Out

3-31

+Gate

Out

3-31

+Sawtooth

Out

3-31

READOUT

SYSTEM

3-31

Display

Format

3-32

Developing

The

Display

3-32

Circuit

Analysis

The

Readout

System

3-35

Timer

3-35

Time-Slot

Counter

3-40

Word

Trigger

3-40

Channel

Counter

3-41

Single-Shot

Lockout

3-41

Encoding

The

Data

3-41

Column

And

Row

Data

Switches

3-43

Display-Skip

Generator 3-44

Column

And

Row

Decoder

3-44

Zeros Logic

And

Memory

3-44

Character

Generators

3-47

Decimal

Point Logic

And

Character

Position

Counter

3-47

Format

Generator 3-48

Y-Output

Amplifier

3-48

X-Output

Amplifier

3-48

Display

Sequence

3-48

7623/137623

Service

TABLE

®F

CONTENTS

(confi)

SECTION



CIRCUIT

DESCRIPTION

(cont)



Page

SECTION 4

MAINTENANCE

Panel

Removal

4-1

Cabinet

Model

4-1

Rack

Model

4-1

Power-Unit

Removal

4-1

PREVENTIVE

MAINTENANCE

4-1

General

4-1

Cleaning

4-1

Exterior

4-2

CRT

4-2

Interior

4-2

Lubrication

4-2

Semiconductor Checks

4-2

Recalibration

4-2

TROUBLESHOOTING

4-2

Introduction

4-2

Diagrams

4-3

Circuit

Boards

4-3

Multi-Pin

Connector

Color-Code

4-3

Wiring

Color-Code

4-3

Resistor

Color-Code

4-3

Capacitor

Marking

4-3

Diode

Color-Code

4-3

Semiconductor

Lead

Configuration

4-3

Troubleshooting

Equipment

4-3

Troubleshooting

Techniques

4-6

STORAGE

CIRCUITRY

3-50

Erase

And

Timing

Circuits

3-50

Sweep

Lockout

Circuit

3-50

Auto

Erase

Circuit

3-50

Readout

Shut

Down

Circuit

3-54

Persistence

Pulse

And

Pump

Pulse

Generator

Circuits

3-54

Flood

Gun

Anode

And

CE2

Circuits

3-55

CES And CE2

Circuits

3-55

Collector

Circuit

3-56

High

Speed

Mesh

Circuit

3-56

Bi-Stable

Mesh

Circuit

3-56

CHANGE

INFORMATION

CONTENTS

(cont)

SECTION 4



MAINTENANCE

(cont)



Page

7623/137623

Service

CORRECTIVE

MAINTENANCE

4-10

Obtaining

Replacement

Parts

4-10

Special

Parts

4-10

Ordering

Parts

4-11

Soldering

Techniques

4-11

Component

Replacement

4-11

General

4-11

Circuit

Board

Replacement

4-11

Access

The

Fan

Motor

4-13

Access

The

Fan

Motor

For

The

137623 4-13

Semiconductor

Replacement

4-14

Access

The

Power

Transistors

4-14

Interconnecting

Replacement

4-14

Cathode

Ray

Tube

Replacement

4-15

Switch

Replacement

4-16

Graticule

Bulb

Replacement

4-16

Power

'Transformer

Replacement

4-16

High-Voltage

Compartment

4-16

Fuse

Replacement

4-16

Recalibration

After

Repair

4-16

Instrument

Repackaging

4-17

SECTION

ELECTRICAL

PARTS

LIST

SECTION 6

DIAGRAMS

SECTION 7

MECHANICAL

PARTS

LIST

7623/137623

Service

The

TEKTRONIX

7623/137623

Storage

Oscilloscope

solid-state

instrument

designed

for

fast

writing

rate

storage

applications

The

7623

has four

basic

modes

operation

Fast,

Bi-Stable,

Variable

Persistence,

and

Non-Store

The

in-

strument

designed

TEKTRONIX

7-Series

plug-in

units

form

complete

measurement

system

The

flexibility

this

plug-in

feature

and

the

variety

plug-in

units

available

allow

this

system

used

for

many

measure-

ment

applications

The

7623

features

large

cathode-ray

tube

(CRT)

screen,

divisions,

with

small

spot

size,

and

fast

stored writing

rate

Operating

Voltage

Operating

Temperature

Plug-in

Installation

and

Removal

OPERATING

INFORMATION

The

7623/R7623

can

operated

from

either

110-volt

line

or 220-volt

line

source

addition, three

operating

ranges

can

selected

by a

jumper

located

the

Rectifier

board

See

Fig

1-1

Select

range

that

centered

about

the

average

line

voltage

which

the

instrument

connected

See

Table

1-1

for

ranges

and

proper

fuses

Table

1-1

The

7623/R7623

can be

operated

where

the

ambient

air

temperature

between

and +50

The

7623

cooled

air

drawn

through

the

instrument

Maintain

about

two-inches

clearance

for

proper

ventilation

all

sides

and

the

top

The

feet

the

bottom

the

instrument

provide

the necessary clearance

The

R7623

cooled

air

drawn

through

the

air

filter

the

rear

the

instrument

and

blown

out through

the

holes

the

right

side

Maintain

two-inches

clearance

the

right

side

for

proper

ventilation

thermal

cutout

switch

the

instruments

provides

thermal

protection,

and

interrupts

the

power

the

instrument

the

internal

temperature

exceeds

safe

operating

level

install

plug-in

unit

into

one

the

plug-in

compartments,

align

the

slots

the

top and bottom

the

plug-in

unit

with

the

associated

guide

rails

the

plug-in

compartment

Push

the

plug-in

unit firmly into

the

plug-in

compartment

until

locks

into

place

remove

the

plug-in

unit,

pull

the

release

latch

the

plug-in

unit

disengage

it,

and

pull

the

unit

out

the

plug-in

compartment

Plug-in

units

can

removed

installed

without

turning

off

the

instrument

power

Special

purpose

plug-in

units

may

have

specific

restrictions

regarding

the

plug-in

compartments

which

they

can

installed

This

information

will

given

the

instruction

manual

for

these

plug-in

units

Operation

The

following

information

provides

the

necessary

controls

and

control

settings

obtain

display,

which

can

used

verify basic

operation

calibration

without

removing

the

covers

making

any

internal

adjustments

the

NON

STORE

mode

the

7623

functions the

same

conventional

oscilloscope

The

CALIBRATOR

signal

convenient

signal

for

verifying

basic

operation

and

calibration

Use

the

Operating

Set-Up

Information

guide

for

setting

the

front panel

controls

Non-Store

Operating

Set-Up

Information

INTENSITY

READOUT



desired

GRATICULE

ILLUM



desired

(midrange)

FOCUS



Well

defined

display

TRIG

SOURCE



VERT

MODE

VERT

MODE



Selected



for

the

plug-in

compartment

with

the

plug-in

unit

installed

and

with

signal

input

to be

displayed

POWER



Pressed

Section

1-7623/R7623

Service

+15

Fuse



ALT

fuse



Spare

jumper

Fig

1-1

Location

Voltage-selector

jumper,

spare

jumper,

and

230

fuse

power-unit

(shown removed)

Pins

Regulating

Range

Selected 110-volt

nominal

220-volt

nominal

Low

110

volts

180

220

volts

Med

121

volts

198

242

volts

108

132

volts

218

262

volts

Line

e 3

w-bl

w-blow

Operating

Information-7623/R7623

Service

INTENSITY-Controls

the

brightness of

the

display

READOUT-Turns

the

Readout

dis-

play,

and

controls

the

brightness of

the

Readout

display

FOCUS-Screwdriver

adjustment

provides

adjustment

for

optimum

display definition

GRATICULE

ILLUM-Controls

graticule

illumination

BEAM

FINDER-When

pressed

the

display

limited

within the

graticule

area

Camera

Power-Three

connector

the

CRT

bezel,

(top)

+15

volt

power

source,

(middle)

receives

remote

single

sweep

reset

signal

from

compatible

camera

system,

and

(bottom)

ground

VERT

MODE-Selects

vertical

mode

operations

LEFT

Signals

from

the

left

plug-in

compartment

are

dis-

played

ALT

Signals

from

both

vertical

plug-in

compartments

are

displayed

(dual

trace)

Display

switched

from

one

vertical

the

other

after

each

sweep

ADD

Signals

from both

vertical

plug-in

compartments

are

algebraically

added,

and

the

sum

displayed

CHOP

Signals

from

both

vertical

compartments

are

dis-

played

(dual

trace)

Display

switches

from

the

left

vertical

compartment

signal

the

right

vertical

compartment

signal

one

megahertz

rate

RIGHT

Signals

from

the

right

plug-in

compartment

are

displayed

TRIGSOURCE

-Selects

the

source

the

internal

trigger signals

for

the

horizontal

compartment

POWER-Switch

and

indicator

;

switch

turns

instrument,

and

the

indicator

when

the

instrument

connected

power

source

and

turned

LEFT

Trigger

signals

are

from

the

left

vertical

plug-in

compartment

only

VERT

MODE

Trigger

signals

are

from

the

vertical

compart-

ment

being

displayed

except

the

CHOP

and

ADD

modes

;

then

the

trigger

signal

the

algebraic

sum

the

trigger

signals

from

the

left

and

right

plug-in

compartments

RIGHT

Trigger

signals

are

from

the

right

vertical

plug-in

compartment

only

NON-STORE-Non-store

operation

Fig

1-2

Front

Panel

Controls

and

Connectors

VAR-PERSIST-Variable

persistence

storage

mode

The

AUTO

VIEW

TIME

PERSISTENCE

control

setting,

controls

the

retention

the

stored

display

FAST-For

storing

fast

signals

MULTI-TRACE-(MULTI-FAST

early

instruments)-For

stor-

ing

multiple

fast

signals

For

each

new

signal

stored

the

ERASE

(PREP

MULTI

TRACE

FAST)

must be

pressed

INTEG-For

storing

very

fast

repetitive signals

BI-STABLE-For

storing

slow

signals

for

long

periods

time

SAVE-Prevents

accidental

erasure

the

stored

display

SAVE

INTEN-(STORED

INTEN

early

instruments)

-Controls

the

brightness of

the

stored

display

the

Save

Mode

AUTO

ERASE-Automatically

erases

the stored

display,

AUTO

VIEW

TIME

setting

controls

the

time

between

erase

cycles

AUTO

VIEW

TIME-(VIEW

TIME

early

instruments)-

Controls

the

time

between

erase

cycles

the

Auto

Erase

Mode

MANE

RASE-Erases

the stored

display

STORAGE

LEVEL-(LEVEL

early

instruments)-Controls

the

writing

rate

the

FAST

and

BI-STABLE

storage

modes

Controls

the

writing

rate

and

brightness of

the stored

display

the

Variable

persistence

Mode

CALIBRATOR-Positive

going

square

wave

voltage

selected

changing

internal

jumper

Output

voltage

jacks

V, 0

and

mV)

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