Tektronix 7904 Manuale utente

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CHANGE

INPCRMATION

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THIS

MANUAL

CILL

COP'

E260000®UP

~F~U~~IUN

MANUAL_

Tektronix,

Inc

Box

500

Beaverton,

Oregon



97077



Serial

Number

____

070-2390-00



First

Printing

SEP

1977

Product

Group



Revised

MAY

1983

7904

(SN

8260000-UP)

Operators

Safety

Information



.............,....,...





,...

Service Safety

Information

..........

...

.................,..,.,,,,.,,..

SECTION



GENERAL

INFORMATION



Page

Introduction

.......................................

..........

. .

....

.1-1

Installation

....



............................

. .

...................

1-1

Initial

Inspection

..........................

.......................

1-1

Operating

Power

Information

................

................,.,,

, .

1-1

Operating

Voltage

....................

...........

....

. .

....

1-2

Operating

Position

.............

. .

...

.............

.....

...........

1-3

Operating

Temperature



........

................





1-3

Repackaging

for

Shipment

...

................

...

, .



1-3

Specification

......

....

. .

....................

.......................

.1-4

System

Electrical

Specification

...............

...

, .



1-12

Standard

Accessories



..............

. .

...............



1-14

SECTION



OPERATING

INSTRUCTIONS

Preliminary

Operation



...................



2-1

Plug-In

Units

...................................

. .

..............

. .

2-1

Installation

Plug-In

Units



................,.,



 

2-1

Controls

and

Connectors

.....................,..

.,.,.









 

2-1

Functional

Check



............................

........

. .

....

.2-4

Set-Up

Information

........... .

. .

...

........

. .

...................

2-4

Display

Focus

...............

............

........................

2-4

Trace

Alignment



. .

....

...

...............

..... . .................

.2-4

Graticule

Illumination



.........

. .

...

..,.....





2-4

Controllllumination

.....

. .

.....



,..



.2-5

Vertical

Deflection

System

..............,...



 

2-5

Horizontal

Deflection

System

..............,.....

 

, .



2-5

Triggering

.....................................................

.2-7

Readout

......................................................

.2-7

Beam

Finder

.....................................

......

.2-7

Calibrator

.....................................

................

2-8

Z-Axislnput

................................

..................

.2-8

Simplified

Operating

Instructions

.................

....,..,.,,,,,,,,,,,,,,

2-g

Single-Trace Display

........... . .....

. .

........................

2-8

Dual-Trace

Display

...........

. .

..............................

2-9

Dual-Sweep

Display

......

........................................

2-10

Dual-Trace--Dual-Sweep

Display

............,.,.





2-10

Independent-Pairs

Display

......................



2-11

Delayed

Sweep-Single

Trace

Display

....................,,..,,.,,,,.,,

2-11

Delayed

Sweep-Dual

Trace

.........,......,....

 





2-12

X-Y

Display

..............................

....

.....

. .

2-12

7904

(SN

B260000-UP)

SECTION



OPERATING

INSTRUCTIONS

(cont)



Page

Detailed

Operating

Information

......................~~~-~~~-~-----~----~~

2-13

Intensity

Controls



................................................

2-13

Crt

Phosphor

Protection



.......................~~~~~~-~~--~~--~~...

2-13

Display

Focus

. .

.....

.........................................

.2-13

Astigmatism Adjustment

.........

. .

...

.......~~~~~-~~---~----~--~~~.

2-13

Y'race

Alignment

Adjustment



..........

....

......~~~~~~~~~--~----~~

2-13

Graticule

.............

....

.............

......................

.2-14

Light

Filter

.......................

.........

. .

..................

2-14

Beam

Finder

........................

...

.........

....

. . . .

....

.2-14

Controllllumination

........................

.--~~~~~~----~------~~

.2-15

Readout

. .

....................................

....

. .

...

.2-15

Remote

Readout

.. .

...........................................

.2-16

Display

Photography

.....

....

....................................

2-16

Vertical

and

Horizontal

Mode

Switch

Logic



.....

..........~~~~~~~--~~~- -

2-17

Vertical

Trace

Separation

...............

. .

.....~~~~~~~--~--~~-~~~ ~

2-19

Trigger

Source



........

..................

.......................

.2-20

X-Y

Operation

. . .............

...

.............

...

.............

2-21

Intensity

Modulation



.................

...

. ~

~~~~~~~--------

----

-~~~

2-21

Raster

Display

............................

.......................

2-22

Calibrator

......................................

. .

.....

. .

....

2-22

Signal

Outputs



........................................ .

......

. .

2-23

Probe

Power

Connectors

....

..................~~~~-~~~------~-~~~~

2-23

Applications

..........

. .

...................................

.2-24

THE

REMAINING

PORTION

THIS

TABLE

CONTENTS

LISTS

THE

SERVICING

INSTRUC-

TIONS

THESE

SERVICING

INSTRUCTIONS

ARE

FOR

USE

QUALIFIED

SERVICE

PERSONNEL

ONLY

AVOID

ELECTRIC

SHOCK

OTHER

PERSONAL

INJURY,

NOT

PERFORM

ANY

SERVICING

OTHER

THAN

THAT

DESCRIBED

THE

OPERATORS

INSTRUCTIONS

UNLESS

YOU

ARE

QUALIFIED

SECTION



CIRCUIT

DESCRIPTION

Introduction

...............

....

........

...

.......................

.3-1

Logic

Fundamentals



. . ..............

...

.....

. .

.....................

.3-1

Block

Diagram



..............................

........

. .

.....

......

.3-2

Main

Interface

.................................

. .

..................

3-2

Front-Panel

Interconnect

..................

.~~~~--~~~~~~----~~--~---~~~

.3-5

Logic

...........

....

. .

...........................................

.3-5

Trigger

Selector



...........

. .

......................................

3-24

Readout

System



............

.....

. .

.............................

.3-27

Vertical

Amplifier

....

...

. .

................

.. .

........................

3-46

Horizontal

Amplifier

...............

......

.~~~~~~~~~~~---~~--~--~--~~

. .

.3-49

7904

(SN

8260000-UP)

SECTION



CIRCUIT

DESCRIPTION

(cont)



Page

Output

Signals

and

Calibrator



......

.............

........................

3-52

Converter/Rectifiers

. .

.....

...

.........

.............................

3-54

Low-Voltage

Regulators

. .

.........

. .

...

..............................

3-59

CrtCircuit

. .

...............

. .

...

............................

.3-62

SECTION



MAINTENANCE

Preventive

Maintenance



.............................

....

. .

...

.....

4-1

Cleaning

......

...

..............................

.....

4-1

Visual

Inspection

. .

............

 



.,........

. .



,..,..



4-2

Semiconductor

Checks



...........................

...............

.4-2

Periodic

Electrical

Adjustment



......................

...............

. .

4-2

Troubleshooting

. .

............................

. .

...............

...

.4-3

Troubleshooting

Aids

........................

.......

....

. .

....

4-3

Troubleshooting

Equipment

..................

........

. .

...

....

4-5

Troubleshooting

Techniques



................

.........

...

.......

4-5

Troubleshooting

the

High-Efficiency

Power-Supply

Unit

......

...........

4-8

Corrective

Maintenance

........................

......

................

4-13

Obtaining

Replacement

Parts

................

...

. .

..................

4-13

Soldering

Techniques



.................

......

......................

4-73

Component

Removal

and

Replacement

....

......

.......................

4-14

Adjustment

After

Repair

..........

...

......

.............,..........

4-27

SECTION



PERFORMANCE

CHECK

AND

ADJUSTMENT

Preliminary

Information

.......

....

............

.......,,..,....,...,,

5-1

Adjustment

Interval

. .

..........

........................,.,

5-1

Using

this

Procedure

......

........

............................

. .

5-1

Test

Equipment

Required

.........

. .

............................

....

5-1

Test

Equipment

Alternatives

.....

. .

..........,..........

. .

...

....

5-2

Performance

Check/Adjustment

Procedure

Index

...............

.....

....

5-5

Setup

Procedure

.....

. .

...

.....................

. .

..........

.5-6

SECTION



OPTIONS

SECTION



REPLACEABLE

ELECTRICAL

PARTS

SECTION



DIAGRAMS

and

CIRCUIT

BOARD

ILLUSTRATIONS

SECTION



REPLACEABLE

MECHANICAL

PARTS

CHANGE

INFORMATION

7904

(SN

8260000-UP)

OPERATORS

SAFETY

INFORMATION

The

following

general

safety

information

applies

all

operators

and

service

personnel

Specific

warnings

will

found

throughout

the

manual

where

they apply

and

should

followed

each

instance

Grounding

the

Instrument

This

instrument

safety

class

equipment

(IEC

designation)

All

accessible

conductive

parts

are

directly

connected

through

the

grounding

conductor

the

power

cord

the

grounding

contact

the

power

connector

WARNING



statements

identify

conditions

practices

which

could

result

personal

injury

loss of

ife

CAUTION



statements

identify

conditions

prac-

tices

which

could

result

damage

the

equipment

other property

The

power-input

plug

must be

inserted

only

into

mating

receptacle

with

grounding

contact

not

defeat

the

grounding

connection

Any

interruption

the

groun-

ding

connection

can

create

electric-shock

hazard

Refer

qualified

service

personnel

for

verification

adequate

protective

grounding system

which

this

instrument

connected

The

word

DANGER

the

equipment

identifies

areas

immediate

hazard

which

could

result

personal

injury

or loss of

life

For

electric-shock

protection,

the

grounding

connec-

tion

must

made

before

making

connection

the

instrument's

input

output

terminals

The

following

safety

symbols

may

appear

the

equipment

CAUTION-Refer

manual

DANGER-High

voltage

Protective

ground

(earth)

terminal

Not

Remove

Instrument

Covers

avoid

electric-shock

hazard,

operating

personnel

must

not

remove

the

protective

instrument covers

Com-

ponent

replacement

and

internal

adjustments

must

made

qualified

service

personnel

only

Other

warning

symbols

where

they

apply

WARNING

Power

Source

and

Connection

Not

Remove

CRT°

Implosion

Shield

This

instrument

operates

from

a single-phase

power

source

has

three-wire

power

cord

and

two-pole,

three-terminal

grounding-type

connector

The

voltage

ground

(earth)

from

either

pole

the

power

source

must

not

exceed

the

maximum

rated

operating

voltage,

250

vol

not

remove

the

clear

plastic

implosion

shield

covering

the crt

face

plate

This

crt

implosion

shield

provides

protection

the operator

from

crt

implosion

Before

making

connection

the

power

source,

deter-

mine

that

the

instrument

adjusted

match

the

voltage

the

power

source,

and

has

suitable

two-pole,

three-

terminal

grounding-type

connector

Refer

any

changes

qualified

service

personnel

Not

Operate

Explosive

Atmosphere

avoid

explosion,

not

operate

this

instrument

explosive

atmosphere

unless

has

been

certified

forsuch

operation

7904

(SN 8260000-UP)

Use

the

Proper

Fuse

Refer

fuse

replacement

qualified

service

personnel

only

avoid

fire

hazard,

use only

the

fuse

specified

the

parts

list

for

your

instrument

and

which

identical

the

following

respects

Exercise

Care

with

Intensity

Level

Crt

phosphor

damage

can

occur

under

adverse

con-

ditions

Avoid

any

condition

where

extremely

bright,

sharply

focused

dot

exists

the

crt

Also,

remember

that

fhe

light

filter

reduces

the

apparent

light

output

from

the

crt

Prevent Instrument

Damage



Type

Slow

blow,

fast

blow,

etc

Voltage

rating

250

etc

Current

rating

Plug-in

units

should not

installed

removed

without

first

turning

the

instrument

power

off,

prevent

instrument

damage

Operating-Power

Consideration

prevent

damage

the instrument

always

check

the

LINE

VOLTAGE

SELECTOR

switch,

located

the

rear

the

instrument,

before

connecting

the instrument

the

supply

circuit

7904

(SN

8260000-UP)

SERVICE

SAFETY

INFORMATION

The

following

are

safety

precautions

which

appear

the

servicing

information

sections

this

manual

This

Service

Safety

Information

addition

the

Operators

Safety

Information

given

previously

WARNING

Not

Service

Alone

not

attempt

internal

service

adjustment

unless

another

person,

capable

rendering

first

aid

and

resuscitation,

present

Exercise

Care

When

Operating Instrument

with

Covers

Removed

Dangerous

potentials

exist

several

points

throughout

this

instrument

When

the

instrument

operated

with

the

covers

removed,

not

touch

exposed

connections

components

Some

transistors

have

voltages

present

their

cases

Disconnect

power

before

cleaning

the

instrument

replacing

parts

Disconnect

the

instrument from

the

power

source

and

allow

the

line

storage

capacitors

discharge

before

removing

the

power-unit

cover

The

line

storage

capacitors

remain

charged

with

high-voltage

for

several

minutes

after

the

line

power

disconnected

unless they

are

manually

discharged

warning-indicator

neon

bulb,

located

the

Power-Supply

Inverter

board,

flashes

when

this

stored

voltage

exceeds

about

volts

not

remove

the

power-unit

cover

while

this

light

flashing

Use

extreme

caution

when

troubleshooting

the

power-supply

unit,

avoid

electric

shock

Stored

potentials

the

Power-Supply

Inverter

circuit

board

remain

long

after

the

instrument

disconnected

from

the

power

source

Verify

that the

power-cord

plug

dis-

connected

and

that the

line

storage capacitors

(C1216

and

C1217)

are

completely

discharged

before attempting

any

repairs

ohmic

measurements

warning-indicator

neon

bulb,

located

the

Power-Supply

Inverter

board,

flashes

when

this

storage

voltage

exceeds

about

volts

However,

simply

because

the

neon

bulb

not

flashing

does

not

mean

that the

capacitors

are

fully

discharged

Disconnect

Instrument

Power

avoid

electric-shock hazard,

always

disconnect

the

7904 from

the

power

source

before

removing

replacing

components

avoid

electric-shock

hazard,

disconnect

the

instru-

ment

from

the

power

source

before

soldering

Silicone

Grease

Handling

Handle

silicone

grease

with

care

Avoid

getting

the

silicone

grease

your eyes

Wash

hands

thoroughly

after

use

CRT

Handling

Use

care

when

handling

crt

Breakage

the

crt

causes

high-velocity

scattering

glass

fragments

(implosion)

Protective

clothing

and

safety

glasses

should

be worn

Avoid

striking

the

crt

on any

object

which might

cause

crack

implode

When

storing

crt,

place

protective

carton

or set

face

down

protected

location

smooth

surface

with a soft

mat

under

the

face

plate

Avoid

Excessive Moisture

Exercise

Care

When

Servicing

Power

Unit

The

power

supply

unit

has

been

Tested

the

factory

ensure

safe

operation

Improper

repair of

This

unit

can

result

hazardous

potentials

the

instrument

chassis

not

remove

the

plate

insulator,

block

insulator,

transistor

shield

from

the

heaf-sink

(See

the

exploded

view

drawing

the

power

supply

unit

for

the

location

these

components

Circuit

boards

and

components

must

dry before

applying

power

prevent

damage

from

electrical

arcing

Exercise

Care

When

Checking

Diodes

When

checking

diodes,

not use

ohm-meter

scale

that

has

high

internal current,

since

high

currents

may

damage

the

diodes

under

test

7904

(SN 8260000-UP)

Exercise

Care

When

Soldering

Multi-Layer

Boards

Several

of the

circuit

boards

the

7904

are

multi-layer

type

boards

with a

conductive

path

laminated

between

the

top

and

bottom

board

layers

All

soldering

these

boards

should

done

with

extreme

care

prevent

breaking

the

connections

this

center

conductor

Only

experienced

maintenance

personnel

should

attempt

repair

these

boards

A2-Main

Interface,

A4-Logic,

AS--Trigger

Selector,

A7-Vertical

interface,

A12-Cap-Rectifier

Use

Proper

Cleaning

Agents

Avoid

the

use

chemical

cleaning

agents

which might

damage

the plastics

used

in this

instrument

Use

non-

residue

type

of cleaner,

preferably

isopropyl

alcohol,

totally

denatured

ethyl

alcohol,

TP35

Before

using

any

other

type

cleaner

consult

your

Tektronix

Service

Center

representative

Not

Use

Sockets

for

Connection

Points

Exercise

Care

When

Handling

CRfi

Anode

Lead

not

touch

any

components

with the

crt

anode

lead

until

fully

discharged

The

spring

Pension

the

sockets

ensures

good

connection

between

the

circuit

board

and

the

This

spring

tension

can

destroyed

using

the pin

sockets

connecting

point

for

spring-loaded

probe

tips,

alligator

clips,

etc

Universal

Euro

220

volt/50

Rated

ampere

North

American

120

volt/60

Rated

ampere

(12

amp max

;

NEC)

Australian

240

volt/50

Rated

ampere

North

American

240

volt/60

Rated

ampere

(12

amp

max

;

NEC)

23617-01

Power

plug

options

REV A DEC

1980

7904

(SN

B260000-UP)

2394

7904

FEATURES

The

TEKTRONIX

7904

Oscilloscope

solid-state,

high

performance

instrument

designed

for

general

purpose

applications

The

7904

features

crt

with

small

spot

size

and

high

writing

rate

Graticule

area

Additionally,

the

instrument

includes

a readout

system

providing

crt

display

alphanumeric

information

from

the

plug-ins,

including

deflectior7

factor,

sweep

rate,

and

other

encoded

parameters

The

instrument's high

vertical

bandwidth

(500

MHz),

and

four

plug-in

compartments

which

7-series

plug-in

units,

form

highly

flexible

measurement

system

Section

1-7904

(SN

B260000-UP)

INTRODUCTION

INSTALLATION

The

Instruction

Manual

contains both operating

and

servicing

information

for

the

7904

Oscilloscope

Section

1-General

Information

;

contains

safety

infor-

mation, instrument

description,

electrical

specifications,

environmental

characteristics,

standard

and

recommend-

accessories,

and

packaging

for

shipment

instructions

Section

2-Operating

Instructions

;

contains

informa-

tion

relative

operating

and

checking

the instrument

operation

Initial

Inspection

This instrument

was

inspected

both

mechanically

and

electrically

before

shipment

should

free of

mars

scratches

and

should

meet

exceed

all

electrical

specifications

confirm

this,

inspect

the instrument

for

physical

damage

incurred

transit

and

test

the

electrical

performance

following

the

Operating

Instructions

Section

and

Performance

Check

Procedure

Section 5

the

Instruction

Manual

there

damage

deficiency,

contact

your

local

Tektronix

Field

Office

or represen-

tative

Section

3~-Circuit

Description

;

contains

basic

and

general

circuit

analysis

that

may

useful for

servicing

operating

the instrument

Operating-Power

Information

Section

4--Maintenance

;

describes

routine

and

correc-

tive

maintenance

procedures

with

detailed

instructions

for

replacing

assemblies,

subassemblies,

and

individual

com-

ponents

This instrument

can

operated

from

either

115-volt

230-volt

nominal

supply

source,

440

Section

5-Performance

Check

and

Adjustment

;

con-

tains

procedures

check

the

operational

performance

and

electrical

characteristics

the instrument

Procedures

also

include

methods

for

adjustment

the

instrument

meet

specifications

Section

6-Instrument

Options

;

contains a

description

available

options

and

locations

incorporated

infor-

mation

for

those

options

prevent

damage

the

instrument,

always

check

the

LINE

VOLTAGE

SELECTOR

switch located

the

rear

the

instrument

before

connecting

the

instrument

the

supply

circuit

Section

7-Replaceable

Electrical

Parts

;

contains

in-

formation

necessary

order

replaceable

parts

and

assemblies

the

electrical

functions

the

instrument

Section

8-Diagrams

and

Circuit

Board

Illustrations

;

includes

detailed

circuit

schematics,

locations

assembled

boards

within the

instrument,

voltage

and

waveform

information,

circuit

board

component

locators,

and

locations

adjustments

aid

performing

the

Adjustment

procedure

WARNING

POWER

SOURCE

AND

CONNECTION

This

instrument

operates

from

a single-phase

power

source

has

three-wire

power

cord

and

two-pole,

three

Terminal

grounding-type

plug

The

voltage

ground

(earth)

from

either

pole of

the

power

source

must

not

exceed

the

maximum

rated operating

voltage,

250

volts

Section

9-Replaceable

Mechanical

Parts

;

includes

information

necessary

order

replaceable

mechanical

parts

and

shows

exploded

drawings

which

identify

assemblies

Before

making

connection

the

power

source,

determine

that

the

instrument

adjusted

match

the

voltage of the

power

source,

and

has

suitable

two-pole, three-terminal

grounding-type

plug

Refer

any

changes

qualified

service

personnel

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