Fairchild 767HF, 767MHF, 766HF, 766MHF, 765MHF Service manual

UP

766H

SERtES

OSCTILOSCOPE

lnstruciion

Seriol No.

Monuol

1965 Foirchild

@

ond lndrument Corp.

Comero

FAIFICHILE'

INSTRUMENTATION

5o soMEiSET PTACE,

CtlFtON, N. J. Or0t5

Monuol No.

6704 5893

TABLE

OF

CONTENTS

Section

Title

I. TECHNICAT SU'IAIYIARY

l-l Introduction l-2 Features

l-3 List of Recommended Accessories ............

l-4 Technical Sur4mary l-5 Type

765MH

Technical

(Specifications) ...

Data ........................

2. OPENATINGINSTRUCTIONS

Introduction

2-l

Preliminary

2-2

Power

2-3 2-4

Operating Instructions

2-5

Beam Brightening

2-6

Operator's Maintenance

3.

CIRCUIT DESCRIPIION

Introduction

3-l

Circuit

5-J

3-4

Regulated

CRT

Normal Sweep

Fast Single

4. PERFONMANCE 4-l Maintenance

Pertormance

Checking the

4-3

Check Ripple

4-4

4-5

Supplies

Calibrator

Checking

5. iIAINTENANCE

5-l

Introduction

Removal and

5-2 Removal 5-3 Cathode-Ray

5.4 Servicing

5-5 Trouble 5-6 Trouble

5-7

Test

Equipment

Service

5-8 Adlusting

Supplies..

5-9

High-Voltage

5-10

CRT

5-ll

Serring

5.12

_

5.13 Supplemenr

LV

Type

Nerwork

.

-

Oscilloscope

Information

Requiremenm

Switch ........ ...... .................

Description

for Low Voltage

Supplies

Circuit .....

Unblanking

Sweep Unblanking

ASSURANCE

Check

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

Power

to Assure

Supply ............

of Low-Vbltige

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

Check

CRT Geometry

AND

RECATIBRAIION

and

Replacement

TuBe

Hints

Shooring

Shootin"g

Replacement

......

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

the

Power

rhe CRT

Required

Adiustments

th6 Low-Voltage

Adiusrment

Adjustmen6

Main

and HV

7062

CRT

(HF

ior Type

Frame

Capaciry

Series

Ohty .....

Terminaiion

Series

766EI Mod

......"

. ... .

-----,-

Inlormation

TEST

Adjusrment...

of

for

.........._

power

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

Only) .

..........

---

...

....

.

-..................

parts.....5-l

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

... ...... ..

Suppty

....

Ciidit ..

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

.........

........

..... .

for

. .......

.......

...

I02

Page

l-l

l-1

r.3

l-3

r-7

2-t

2-l

24

2-4

3-l 3-l

3-1

J'J

c-J

4-t

4-1

4.1

4-l

4-2

E-l

b-Z b-2 5-3

5-B

b-+

b-4 b-4

b4

f-tO

S_10

5-13

Section

6.

PARTS tI5I5

6.4

Electrical

68 Spare

List of

Figure

Fairchild

1-l

t-2

1-3

t4

l-5

l-6

l-7

l-8

t-9

2-1

2-3

3-l

E-2

5-l

5-2 0-c 5-4

5-5 Right 5-6 Left

5-6 L*

5-7 Installation 5-8 Installation

5-9^

5-10

Oscilloocope

Type Type

Carrying

Type Type

Type

with

Installed

Typ€

Clearance Dimension

tion

and

Moundng

Type

vDe 767H

Clearance

tion

(Standard

Type

Front-Panel

Type

SinEle

Single

Sweep Speed

ype

Type

Regulators,

Diagram

ype

Type

Regulators, Diagram

Type

vpe 766F

tional

Rear View

and cRT

Rear

and Diodes

Top

Points.

Adjustments

Peaking

Transistors,

Type^7062

Test

Title

AND

SCHEiAAIICS

List

Parts

List

Recommended

Vendors

rrruslRAiloNs

Title

Type

766H Transistorized

Portascope

765H

765 Portascope

Case

766H Bench Model

767H Rack Modei

70854 Rack

Type

767H Oscilloscope

of Type

Type

Tvoe 7078

767H

Oscilloscope Showing

Dirr.ension

of Type

Insrallarion)

765MH

766H Solid

766H Calibrator

Sweeo Unblankino Vs

Sweep

766H Ser

766H Series

Unblanking

Functional

766F

?66H Series

Functional

766H Over-all

Block

Showing

View Showing

View

o[ Chassis

Transistors and

Oblique

Trimmers

Oblique

View

Swirch

Instructions

Insructions

I-nterconnecring

Serup

for Peaking

with Complerc

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

Slide

7l

70E5A Rack

Kit for Flush

7085A Rack

State

FaFacilities

Diagram

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

View Showing

Oscilloscope,

Display ....

*200V

*50V

System

Transistors

Fuses,

Showing

. .

Showing

and Adjustment...

........-...........

Set to

Showing

g0o

for lnsta]lla-

Slides

for

Insta'ila-

Slides

. ...

'

Vs

and

*100V

Block

and

-50V

Block

Func-

Switch

Test

y

X &

...

..

. .........

-

Diagram

....

Aljusti.rent

Page

6-l

6-5

6-7

Page

1-0

r-2

t-2

1-2

t-2

l-5

l-6

1-6

t-7

2-3

3-2

8-2

5-l

5-7

5-8

E-9

5.11

5-12

5-13

5.14

section

1

-technicol

summory

r0cus

C}

ASIG

t

I-O

Figute l -l - Foitchild fype 766H

frcnsistorixed Oscilloscope

sEcTtoN r

TECHNICAT SUfiTiAARY

l.t INIRODUCIION

(Figurcr

The Fairchild Types

Oscilloscopes are available

bench, rack, and Models are identified

Series; the

Series, and the Rack-mounted

numerical

Bench Models by the Type 766

Series.

portable models. The Portable

by the TyP€ 765

In addition, there are alphabetical

to the numerical series to identify special

circuits.

scope

voltage option is 5 Kv and these series oscilloscopes

identified by quency

Type

The suffix H denotes the

with an accelerating

the absence of the

The

7062

H/F denotes the high-voltage

suffix

model. These

CRT Termination Network

models are provided with

to accommodate the Type

Plug.in model. Further details Ior all of the

Amplifier.

The

suffix

l-2 io l-51

and 767

766,

765,

in three basic

Models by the Type 767

suffixes appended

high-voltage oscillo-

potential of

79-024

M

denotes the

l3 Kv. The low

H alphabetical suffix.

to enable them

DC to

models are

Family of

form factors:

numerical

electronic

high-fre-

100 Mc

militarized

listed

in the Specifications.

Since the electrical circuits are

models

confined to the Type

erences to the

cable

except

to the

for minor difierences,

Series

766H

Type

766H

Series

other models unless otherwise

To simplify discussion, the Type 766H

loscope may be categorized

(l)

Low-voltage, (2)

Frequency.

into three

High-voltage, and

l. The following models comprise

Series:

Type

765, 765M,

The following

2.

Series:

Type

767MH

765H, 765MH,

3. The following

quency

Series:'

Type

765H/F, 765MH/F,

767H/F, A 767MIJ/F

766, 766M,767,

models comprise the high-voltage

766H, 766MH,

models

comprise

identical in all

discussion will

Oscilloscope.

be

will

All ref-

equally

basic Series:

appli-

indicated.

Series Oscil-

(3) High

the low-voltage

and 767M

767H,

the high-fre-

766rI/F, 766MH/F,

are

the

be

rNore.'

to the high.voltage series

high-frequency

Separate manuals are

These

oscilloscopes

Termination Network.

CRT

in units. If desired, these

the

same

binder

supplied

are electrically

except for the addition of

provided for each of the plug-

manuals may be inserted into

your

with

Indicator unit,

identical

I.2. FEATURES

The Fairchild Type 766H

consists

of

tains the power supplies, a ciated circuitry,

of an Indicator

available

plug-in modttles. The Indicator Unit con-

and an

The plug-in modules take the place of the vertical

and horizontal deflection

oscilloscope, and their outputs are connected

to the deflection

plug-ins

All

be used universally in

rnodules may be performance demanded of them

plication

.

o

for which they are to

l3 Kv accelerating

5 Kv)

Quatity

Three basic Main Frames available;

(Type

plates of the cathode-ray tube.

Type

in the

selected

display area of 6

765),

Bench

mounted (Type 767)

o

Silicon

o

Dual Plug-in capability (DC to 100 Mc) with

state circuitry

solid

High Frequency or

o

Z-axis input provided on all bench and

mounted models

o

Illuminated internal graticule optionally

able

o

Silicon transistors and fully regulated electronic

power supplies, assure and long-term reliability

Family

of Oscilloscopes

Unit and any two of a number

cathode-ray

internal

systems

74-00 and 76-00

the

oscilloecope.

to give a degree and type of

potential

cm by l0 cm

(Type 766)

tube with asso

amplitude

a conventional

of

by

be

particular ap-

the

used.

(low-voltage

calibrator.

directly

Series may

plug-in

The

option:

Portable

and Rack-

H/F Models

maximum drift stability

the

all

rack-

avail-

t -l

section

..-

PHOTOGRAPHS

I

-technicol

OT BENCH, RACK AND PORTABTE MODEI.S

summory

Figwe

l

-3-

Wilh Complele

fype

765 Porros(ope

Corrying

Cose

Figwe I -2.

rif-or

-i

c}

fype 765H

Portos(ope

Figure

Itpe

l -4.

766H Bench

Model

Figure I

fype 767H Rock

t-2

-5. Model

I

l:"

c,l

fi;

@

),-

-

,

4:J:

J

/,-A)

technicql

summqry-section

1

\-

t -3. tlST

Typr

OF RECOIyI^'IENOED

or

Pqrt Numbcr

(10:l

AITENUATOR

tcrminoied in BNC type

12?0 10M. 1298 l0M.

1299 l0M, 799$ l0M. 7999r l0M,

t

For

Amplificr.'

,t800 4800 5862 Blue

,1800

4800 4501

7020

7030 7085

7081

7080

276C

7035

wiih lypc

use

5861 Amber

5863 610l

Grecn for P2 ond P3l screen

Nsutrql,

0,152 Anliporollox

SCOPE

TRAVETERS

Top

26

Top

32th inches from floor

Slidc drowcr

TERMINAI.

Mqle BNC

femqle odqpter, Scope binding

vrEwtNG

Viewing

Round

reflection;

piece

ACCESSOTIE

Dcrcription

PROBES

conncclorl

pf;4-ft

l0

pf;

14

pf;6-ft

12

pf;

7

pf;9-ft

9

79-O2A Dsol Trocc DC to IOO M€

COTOR

for

8-ft coblc

4-ft

coblc

cqblc

FITTERS

P7

screen

cqblc coblc

for Pl I or PZ screen

scole

&

polorized

RACK

STIDE

Girculqrly

Troy: 103/a inches x 22th inches;

inches from floor

Yr

Troy: 17.1 inches x 22th inchcs;

(for

rqck-mounted

ADAPTERS

uniil

type €onnecfor to Type C

UG.635/U

poit

lo

AccEssoRrES

Hood mode

of moldcd

lighi shield tq rcduce

does not hovc

qdqptc.

BNC

q

molded ey.-

rubbcr

glorc

ond

TERMINATING

1285A

150/1sOA,

153/1s3A

L291

1296

orv

'|

2

I

2 2 2

50-ohm, 5-wott,

Oscillorcope-Record Cqmcrqs

oblc

Extension

lhe

OPERATIONAT

Complatc lil coniqinr:

rvP.

276C

128 5A

4290

1287

UG-636/U C

UG-1090/U

CRI

7062

CRT Terminotion Network Kit lo trqnt.

form rhe

neh.rork i5 stqndqrd

High-Frequency Moin Frome Oscillo-

scopes

766t HlF, 766Hlt, 767Hlt

767 MH/?l

l -4. TECHNICAL

The

electrical characteristics

Voltage,

Oscilloscopes

tion which follows.

High Voltage,

are listed in the Performance Specifica-

RESISTOR

CAATERAS

qccessorier

plug-in

ASSEMBI.Y

cqble

from the oscilloscopc

ACCESSORY

Viewing

50.ohm

Probc

Risht

8NC to

CABIE

Terminol Adopters

IERMINATION

H modcls to H/F models. Ihis

(Typer

SUMIIIARY

and

Typc

C connector

with

for remgic opcrotion

KIT

D...rlptlon

Hood

Terminqtion

ongle; UG-306A/U

mqle

io BNC

NETWORK

equipment

plug

femqle

tip

{bononol

wiih ihc

765Hlt, 765MHlf,

(Spccificolionsl

the

of

High-Frequency

Type 766 Low

ruit-

of

qnd

Series

Height

widrh

Depth

Weight Corrying

Shipping Weight

Note:

r

Sehind

Cosc

A minimum

qssure

to

odiqcent cquipment.

ponel.

of 2"

odequqte

clearoncc murl

cooling,

With mouniing

PHYS]CAI.

Portoblc

Models

765-

|Vt'

17!q"

23'

l8

lbs

9lbs

37 lbs

be mqinlqined

Do

not

iubiec, ,he unit

brockeh reversed:

CHANACTERISTICS

Ecnci

766-

t3le"

eTq"

2oYe"

27 lbs 37 lbs

the rqck-mounted

tor

lo lhc hot

r/a

t 8

inches

Models

exhouri

model

qir

Rqck.Mounted Modclt

767-

19'

20"*

27 lbs

37 lbs

o,

l-3

section I

-technicol

summory

SPECIFICATIONS

CATHODE.RAY

Type

For lyp. 766

765M,

1765,

FZ65O-O-P3l

deflection

5000 volts occelerqting

For lype755 High-Voltoge 1765H,

F7660-0-P3l deflection

13,000

Fot

lype 766 High-Frequcncy

765H/t,

& 767MHlFl

F767O-O-P3\

deflection

13,000

Optionol

Phosphor:

P7 phosphor

trqnrient

grophic

photogrophic

ond

on

speciol order

766,

single

cothode-roy tubc ir normolly

765MH,

single

coihodc-rqy

volts occeleroling potentiol

76sl/.Hlt,

sinqle beom,

cothode-roy tube is

voli5 ocqeleroting

for long

obseryqtion; Pl I

use; ond P2

Aluminizolion

All tubca

ond to

Bezel

Lighi-tight

lcope

filters

Grqlicule

Engrqved

groduotion:

tube.

zero to intensity

ing. ovoiloble; grophic

CRT Direci lnput

l. X Axis,

2q. Y

qre qluminized

preycnl

bezel

cqneaq ond

qnd

scoles

edge-lii

ond oppropriote

Scole illuminotion

internol

CRT

white

recording

l0 to

Axis:

5.2 to

F7660-0-P-

2b. Y Axis: 2t/t

CRI onlyl

TUBE DAIA

Low-Voltcae

766M, 767

beom,

766H, 766MH,

beom,

Series

& 767M1

electroslotic focus

poteniiol

Serie:

767H & 767MHl

electro3tqtic focus ond

tube is normolly

Series

766Hlt,

electrostotic focus

poteniiql

persistence

pho!phor

phosphor

use. All

screen

chorge distortigns

provides

permits

groticule

odequote

no-porollox groticule

scole

15 volts/cm

7.2 volls/cm

to

for combinotion

phosphors

other

for moximum light

firm mount for on oscillo-

reqdy interchonge of

hoving 6 cm by l0

color filter over foce

control vories light leycl from

moy be edge lit for

photogrophic

for

CRT onty)

3Yz vohsfcn

qnd

supplied;

766MH/F,

normolly supplied;

low frequency

(oll

(F7650"0-p-

767H/F,

photo-

for

qvoiloble

outpul

record-

is

optionolly

photo-

CRT seriesf

IF767O-0-P-

qnd

yi5uol

ond

cm

of

or

Z Axi:

(Bench

Negotivc

ore

required

I mcgohm

trqce

CRT Beqm

Beom

Amplitude

Accurocy

Frequency

Acces:

line

Line

Controls

lNTENSlry,

vided

on the Mqin

beqm

Brightening

A switch lqbeled

lhe Type

Series plished

cqthode

5peed lronsienti)

Col lV,

ot

iock

moximum, permits

Nominolly

locked io

be used to

power"line

to Plug-lns

The

some l.volt

plug.in.

eoch

vided wiih

qctive

oll

normolly

of

VOITS/D|V

the

Voltoga

From

105 io

60-cycle line

Frequency

Operoiion from 48

excursion is reduced

ond where power

ond

Rqck-mountcd Models

pulse

766 High-Volloge

chqssir. Beom

by

gqting

VOTTAGE

peqk-to-peok

qdiurtment

tl./o, olwoys

power-line

grid

to

of CRT blonks trqce.

inlo on impedoncc

coupled vio

FOCUS,

NORMAT/SINGLE

beom

{for

on front

I % nominoll; fqst rise

t

0.01

qnd

ASTIG

Frome for

brightening

goling

(normol

photogrophing

CATIBRATOR

3quore wove

ponel

o{ Moin Frome

qflenuolor

of

within

frequency. This woveform

of opproximqtely

pf

cqpociio. to

conirols

controlling the CRT

ond

operotion) or by

probe

i2.5%

colibrote ihe time oxis wherever

frequency

o suitoble

circuitry. The

be inseried into

is o controlled siqndqrd

colibrotor woveform

The omplifier

qrrqngement

plug-ins

colibrotor wqyeform

the input

swirch

for

POWER REQUIREMENTS

125 volts

or from

through 1000

ol

exlremes of frequency

line

disiortion

210 io 250 voltr dt

cycles; line voltqge

exceeds 5%

onlyl

25 volts

dim

qre

pro-

provided

is

High.Frequency

con

be

single-shot high-

signol

qnd

is

supplied to

will

cqlibrotion of

stoge by meons

on

occom-

ovoiloble

1t2,5%

fqll

iime

moy

the

pro-

be

will

ronge

l-4

technicol summory-section

1

Power

'150

From

used

DC Power Supplie:

to 230

All supplies ore electronicolly

ENVIRONMENTAT

O/eroring

Temperqlure

From ooC to 50oC.

mql cutout swilch lo

wqtts

depending

SPECIFICATIONS*

Ronge

All

models

prolect

the unit

on the

reguloted

incorporqle o ther-

when

insufficient. Adequote venliloiion ond cleoronce

qround

lotion to

qmbieni

r

Applicoble

given

is

unil musi be

ossure intoke oir below ihe specified

iempe.oture

for oll models

elsewhere

provided

except militorized

in

thir

Specificotion.

in rock-mounted in3tol-

plug-in

coolinE

is

or "M" Models.

Storqge

Temperoture Ronge

From

-400c

ro + 850c

Altitude Ronge

Seo level

Humidity

Constont humidity, Inlermittenf operotion ond lemperolure specificoiionr

sotion

Shoc k

l0G

shock {or durotion of

15,000 feei

io

operoiion at 30oC ond 80/6 relolive

Vibrqtion

l5-minute double

Doto for

cycle from l0 to

omplilude; vibroies in

"iA"

models

under oll humidity

prevenl

lhol

25 milliseconds

33 cycles ot

plones

3

0.015

condcn-

inche:

Figvre l-6. Type

7085A Rock Slide

5e, ,o 90" with Type

767H Oscilloscope Instolled

l-5

section I

technicol summory

-

:t

a'

Figure l-7.

lype

Type

7O85A

767H

Rock

Oscilloscope

Slides

ond fype

Showing

Cleoron<e

7078

Kit lor

Dimension

Flush

Mounting

-:!

i

H

lor lnstollotion

ol

t-6

Figute

lnstollorion

l-8.

lype

ol fype

767H

22"

Oscilloscope

7OB5A

Rock

ShowinE

(standotd

Slides

Cleoroace Dimeasion

lnstdlldtion)

for

technicol

summory

section

-

I

I.5. TYPE 765IAH

TECHNICAT DATA

AAILITARIZED

I

Meetr ruggedized militory specificolions

I I I

power

Low Light weighi-

Eqch unit is vibrotion

conrsmplion

extremely

tesled

I

Operotion

porioble

I

Certificqtion

Figure I

I

-9. Iype

I

Operqtion

from

-30o

RFI shielding

of complionce

765MH

PORTASCOPE@

power

line

Federql

supplied with eoch

frequencies

I

Semiconductor circuitry

Stock Number 6625-O'6-llls

io

from

t6OoC

I

of 48-IOOO

system

cycles

The 765MH is a militarized, The

uoit is housed in a sturdy flberglas

carrying handle

aisles,

hatchways or any confined area. A

provided

is

This

aod

may

the 765H Series-

Heater

staodby heater

tioo.

below 0oC,

Weisha

less pounds.

glas

the case.

Temperature

basic indicator

has two cayities iDto which various

be ioserted. All electrical

Strips

watts

200

-The

thao 35

Case aDd

material. An

Storage

Operating

Operational

Operational Non-operating

permits

with facilities for

houses

A 200-watt

-

is incorporated for

of additiooal standby

weight

pouods.

of this uoit

Maio frame weight

covers are

RFI metallic

(in

Range

-40'C

-30"C

-30"c

(modification

Attitude

to 15,000 feet

to

all

to

*85"C

to

*50"C

to

+60'c

-

5O,OOO feet

easy

positions)

103)

rugged,

portable

transport through narrow

mounting accessories.

the

CRT,

specifications are ideotical

thermostatically

low temperature opera-

iDcludiEg

oscilloscope.

case. A conve ent

fiberglas cover

power

supplies,

X and Y

power

plug-ius

cooEolled

are required

plug-ios

is under 27

constructed of rugged

coatitrg

sprayed

is

-

(without

(with

fan)

6ber-

ioside

Humidi8

humidity.

perature

MIL standard

cotrdeqsatioo permitted

Shock

2O

to

is

G

15 G shock

l0

C shock for

(4

shocks

Vibration

0.010 ioches

planes,

in 3

S-minute scao

cycles al Vibrated

with

a 3Gsecond

tor mounting

Transit-

tions when

1.2

G 3o-inch

Height-

widrh

Depth Weight

Net

CoDstant

-

Intermittent

specificatioos which

2028 method 106A

-

shock

foi duratioo

for duration

duration of 25 ms

in each

-

0.025 ioches

in 3

Uoit

-

(with

-

27

-

plane

ls-miDute

double amplitude

ls-minutes

cycle, ls-miqute

planes,

scan cycle.

the

fiberglas case.

will

meet Natiooal

factory

packaged.

drops on corners.

cover)

pounds

operation at 40'C and

operarioo utrder

preveos

when

operathg.

all humidity

coodeosatioo.

except freeziog.

of 5 ms

of 1l ms

for a

total of 12

cycle from l0

itr each

double amplitude

l5-minutes

Four

Vibration

t'7.%"

23"

ShippiDg

to 3000 cycles at

(peak-ro-peak).

(2

plaoe

cycle from

in each

web guides

G limir)

plaue

Safe Transit

for

edges aorl

81,i"

37

-

95Eo relati\e

Meets

shocks.)

Vibrated

with a

IO to 3000

(peak-to-peak).

(5

c-limit)

provided

are

Specifica-

ooe hour at

flat surfaces.

20.9 45-0 cm

58.4

pounds

tem-

No

cm

1-7

sEciloN

2

\?

OPERATING

I

2.I. INTRODUCTION

This

section of the Instruction Nlanual describes the

operadon of the Indicator Unit

modules inserted.

with the

of a conventional

plug-in

tical and horizontal

instructions

tained in

for each

the

2.2. PREI.IMINARY .

The Type

wide band laboratory instrument with dc to 100 Mc capabilities.

accept

any

of

Series Plug.ins, thus determining the oscilloscope's

mate performance.

in

essence a Type 766H Series unit which has

provided

work Trace

models, heater

The low-voltage power

and

the instrument.

vides

senting displaying

with the Type

to accommodate the Type

Ampli6er Plug-in.

a

200-watt

is incorporated for low temperature operation.

unregulated voltages

the necessary controls

a sharp display of the desired

the signals applied to

Operation oI the Indicator

modules inserted

oscilloscope with corresponding ver-

deflection systems. Full

the

of

manual

INFORiAATION

766HlF

The

the present Types

Oscilloscope is a general

dual

plug-in

which accompanies it.

cavities of

The Type

7062

For

thermostatically-controlled standby

supply

for application

The cathode-ray tube

and adjustments for

by the plug-in modules.

The voltage calibrator yields a l-volt, peak-to-peak

Iast rise

normalizing

and

module

trolled

2.3. POWER

The

for

rear

your

115-volt

voltage

volt

voltage

yond

and fall time square wave signal for use in

the gain

for setting the

wherever the power-line frequency is a con-

standard.

REQUIREMENIS

line transformer in

of the

l5-volt

instrument

either I

the plug-in amplifier modules

of

timing of

this oscilloscope can be set

or

230-volt

operation; a plate

specifies

instrument is set. If the instrument is

operation,

between

operation,

between

the limit specified may cause

it will

operate properly at any line

105 and 125 volts. Il ir is

it

will operate properly at

210 and 250

with the Plug-in

is the same as that

operating

modules

the instrument

74-00, 76-00,

766H/F

CRT Termination Net-

79-024

the militarized or "M"

provides regulated

deflection plates

the

the time base plug-in

the voltage for

volts.

Line voltages be"

the power

are con-

purpose,

and

Oscilloscope

100 NIc Dual

throughout

circuitry pro-

intensity for

on

which

set for

for

set

any line

supplies

INSTRUCTIONS

to

go

out of regulation. Powerline

will

be more limited

Unit

will

79-00

ulti-

been

pre-

the

230-

is

frequency

tion

If

I l5-volt

by merely

desired voltage.

Although

frequency

cau

1000

required

2.4.

Any of the plug-in

either

The module

flection

rols

possible

vertical time

a time-base

coupling

module

sweep is

X-Y

in both

often referred

"X-Axis"

the "Y-Axis"

adjustment

vidual

The following

operator

Figure

We

with

deavor,

built-in

the

various controls

Intensity

through

oscilloscope.

range

of 48

should

desired,

not

exceed 5%.

this instrument can be

operation

setting the

to

primarily

between

be operated

cycles.

However,

50

at any line frequency

ar rhe higher frequencies.

OPERATING INSTRUCTIONS

(Figures

2-I

qnd

of the cavities

the

on

of the beam, and the module

the vertical

deflection of the beam. Thus, it is

to change from a horizontal

sweep merely by changing the position

module. However,

an unblanking pulse

to the cathode-ray tube,

used,

operation is

oscilloscope cavities. (The right.hand

trace is

the

obtained by using amplifier modules

ro in rhe plug-in

cavity;

manual.

in

2-1. 2-2.

know

your new instrunent.

you may

calibrator

the Z INPUT

the left-hand

cavity.) The procedure

on each plug-in

illusrrations

becoming familiar

Type

Front-Panel

Type

that you are anxious

set up

signal

on the display.

modulation

voltage

the

over

to

230-volt

I l5Vl230V Selector

designed

and

slightly higher

2-2)

modules may be

in the front

right,

1000

cycles.

operation,

60 cycles,

controls

there

permissible

Harmonic distor-

to

operate at a line

from

line voltages

of

the horizontal

is

from the left-hand

so when a vertical

not blanked between

manuals

cavity is referred to

is described in its indi-

are designdd

with

the oscilloscope.

Solid State

766H

Facilities

Calibrator

766H

to get acquainted

To aid you in this

instrument

the

to demonstrate the

of the CRT beam

connector at the

excursiori

power-line

converted from

or vice versa,

switch to the

this instrumenr

48 cycles

are

inserted in

the instrument.

de-

the

on

time sweep to a

no

left, con-

provision

sweeps.

cavity is

for

as the

for making

the

to aid the

Oscilloscope,

Display

en-

the

using

efiects of

is possible

rear of the

to

of

as

2-l

action

Co.nol:

SCALE

with

Control

voaca icole

.onkol

tion; tttoch€d

2

-

INTENSITY

vo.ier

II.LUM

il.h: dimBer

sit.h tuh3

operoting

no..

illu inq'

instructions

PAITERN ?OSITIONING

.Joyslick <onkol:

sirioning the dirploy

horizonlol o.d vorti.ol

the

directionr

potte.n

the

permitt

for r.gLhotion

wiih

tie

a#

SMEP

OIL,4YIIII

.t:t. a- / a'

-a

r

in both

grcli.ul.

*

po-

of

a

rocus

provid6' o. odilst-

Co.tol.

dble voltog.

tub. fo.ui

Cont.ol: obl. voltos€

tub. to optifrit.

for .othod.ioy

srid

ASTIG

provide5

Ior cothod.-roy

t6 oPlinit.

on odiurt-

tPol rhoPa

Ita

-

Figvte 2-1. fype 766H

Solid Stote Oscilloscope,

-

Front Ponel

Fociliries

BEA/I{ ROTATE

Con(.&ic a<r€wddvlr.d'

vori6 th. field rtrength

hol,

whi.h rhe CRT b6om i.ter

cepl! cou3ing thur .oFp..totios

.

corlh'3

mqgnelic

it ,o rotot.,

for

off..t or

lha

"2

fleodiGt INTENSITY,

ASTIG

.onirols for d

|eh,

Reqdiu,, 6 ,o

TOCUS ond

por.

shqrp

cenrer

th.

T6

obtoin lh. colibror,or

ihe numbered

Use

pldy.

rrcpr i, 3.q!.n<c.

the

ron.

Fro<.dur.

Thi. willeliml.ot

operoting instructions

disploy, ,er the

wh.n

'cockpir"

conhots

diffi<ulty i5

troobl*

erodty o! .hown

.rp.ri.nced wh.n

due ro ni3otignoenr

, EEry 765H

*

ond

obroinins

of controtr.

e

p€rlorn

o di!.

section

-

ASIIG,

Set TENSITY

FOCUS,

(onrroh

ro

& lN.

ce.-

2

Set POSITION

Rotore inn€l l.ob

ABIE)

fllly

conhol. ro

clockeke

tvARt

Set

NORM

inner

(TRIGGERI

tnob

Set olter knob

t6

t/vtODEl

ro

CH 1

-. ,tr

A\.

:,ifi[

o{t-lYlc

s[EP

.-/

S.t to aUTO

e

-

,

5 mSEC

Sei ,wnch6 ,o:

TINE

+. AC,

A

Figure 2-2.

lype 766H

Colibrotot Disploy

2-3

section 2

.-

To

remove a plug-in from

unscrew

unit

its

nected

Indicator

oI

tical

This is

SWP

plug-in modules

plug-ins

range

be

cavity.

brated

cavity.

bration

variations When

be calibrated

the knurled

and pull it free

is provided

cernector, hence

whenever

When you change

the plug-in

and

horizontal sensitivity of rhe cathode-ray tube.

accomplished by means

CAL

to any NIain

The Type

in the order of 3 to I so that in general they

calibrated

All

Type

to

The Type

range of approximately

inserted

operoting instructions

-

thumbscrew

the

of

Main Frame. The

with a power-line interlock

all

power is automatically discon-

a plug-in is removed.

module

a

Unit to the

other,

you trust

the Main Frame,

at center bottom of

from one cavity

adjust the gain

siurply

plug-in

jumper

of

unit to allow for the difierence in

of the GAIN ADJ or

front-panel

screwdriver controls

on the

and permits normalization of the

Frame.

Series plug-ins have

76'00

to the scale

74-00 Series Amplifier plug-ins can be cali-

the scale

74-00

in X sensitivity

in the Y cavity,

urarkings

markings

Series

in

Sweep plug,ins have

individual Main

of

these

to twice their nonnal

a GAIN CAL

in either the Y

either the Y or X

a cali-

L25%

to adjr.rst for

Frames.

plug-ins can

sweep rate.

on

the

ver-

can

or

only

plares.

to unblank

coupled

CRT.

when

trurn

be shot

cathode

speeds

available

tiated

brightening single

X

l0

2-3,

eflective

no

Shot

the

the r.rnit may be

2.6.

To rerord

negative

Cathode

high

beam current

Basically,

used

except on fast

rnode,

of the CRT. This means

are used,

since the brightening

by

the capacitive-resistive coupling

Figure

?-3

sweep

g.sec, and 5

may

it

at very

real disadvantage

mode is to

BEAM

OPERATOR'5 MAINTENANCE INFORMATION

high-speed

or brighten

gate applied to

drive

lor beam brightening

writing

the beam brightening

the brightening

rates

with

rransienm,

the CRT beam

are required to

minimum spot

sweeps, because

gate is ac coupled

full scan unblanking

shows the efiect

pulse. The

and for

be

seen that the beam

sweep rates

respectively.

4,sec

fast sweep speeds.

since the purpose

photograph fasr

BRIGHTENING

operated

of the AC

Time Base

as a standard

it is

the cathode

feature

that if

gate will

coupled beam

unit was

of 50

,g,sec,

Judging

brightening

This

of the Single

transients. By

switch to

oscilloscope.

necessary

with an AC

of the

is desirable

assure

size.

maxi-

should not

in the single

to the

slow sweep

may not be

be differen-

network,

set up for

Z0

from Figure

effect oflers

4,sec,

is only

setting

NORMAL,

2-5. BEAM BRIGHTENING FACILITY

back-of-panel

A

BRIGHTENING

voltage

so that both

FAST

ing)

switch.

plying

Figwe

SINGLE

are

Beam

the

2-3. Single

and

the

NORIVIAL

available. See Figure

brightening

unblanking pulse

slide switch

is provided

high-frequency

(beam gate blanking)

SWEEP

Sweep Unblonking

ONLY (grid-cathode

is normally

to the

on all

Nlain

5-6 for location

accomplished

CRT beam gating

(Figure

2-3)

labeled BEANI

oI the high-

Frame models

and

blank-

by ap-

vs

Sweep Speed

of

Frequently,

covered

by the

tion

conspicuous

in

information

the operator.

o.

A Nqked Screen

If the

on the

plug-ins

is

Refer remedial

screen lor

confined to

to Section

many

oscilloscope ailments may be dis-

through an erroneous display

absence of a display. The

the paragraphs to follow will

according

operator is not able

either beat-n after substituting

known to be

the Indicator

5 of this rnanual for diagnostic

proceclures.

b. lnsufficient Deflection

II the

horizontal

be

set

to the proper value

driver

controls

ins, then supplies

TPl301

Test Point

chassis.

tnay cient

if there

right-haucl trtotlule

check

at Test Points

located

If these voltages

reside in

vertical

is insuficient

Instmction

is

rnodule.

or vertical deflection

GAIN ADJ

the output

on

the

TP200l also

one

oI

deflection,

Reler

Nlanual

on the screen or

pin-point this

to the syluptoms presented

to obtain a trace

operating properly,

N,lain

or

the trouble

Frame Unit.

signal cannot

with the front-panel

or SWP CAL

the

of

low-voltagrc

TPl00l,

N'Iain

check

the

it is in

horizontal

TPtl0l, TPt20l,

Frame.

located

out alright, the

plug-ins. If there

rhe left-hand module;

deflection,

The high-voltage

on the

rhe plug.

on

regulated

Nlain

is insuffi-

it is in rhe

to the appropriare

lbr

ftrrther

infonuatio[.

informa-

to

or spot

other

and

screw-

and

Franre

trouble

plug-in

2-4

opersting

instructions-section

2

c. lmproper

A front.panel

vided

on the Time Base Plug-in

tion

of this module

does

not have

of the regulated

mentioned.

out the

tory, trouble may

Time Base Plug-in.

lmpropar

d,

If

external

but

the intemal triggering mode is not,

Sw..p Timing

screwdriver control, SWP

sufficient

supplies at the Test Points previously

II these

friggcring

and line triggering modes are satisfac.

reside in the trigger

CAL,

permit

to

to any main

range, then check the output

voltages are normal, then

frame. If this control

take-off circuit of the

normaliza-

is pro-

check

then the

Y Plug-in

ever,

any

resides in

Time Base

format ion-

e.

amplifrer

if improper

of the triggering

the Time Base

Plugin

Woveform

Distortion

If the display under

there is

insufficient

the problem

fying

POSITIONING

no other manifestation

deflection, improper

is confined

the distorted

conrol is properly

the

that

tiggering cannot

Instruction Manual for

signal. Check

operator

be obtainid

sources,

observation is distorted,

to the

the trouble probably

Plug-in itself.

of

rouble such

sweep rate

plug-in

which is ampli

that the PATTERN

adjusted.

is using. How-

from

Refer

to the

more

in-

but

as

etc., then

2-5

sEcTloN

3

CIRCUIT

3.I. INTRODUCTION

This section

circuit

Unit

description of the

alone. The circuit description will

the Instruction

of

the Functional Block Diagrams,

Emphasis

rather

mended

be

referred to in following

3-2, CIRCUII

q.

Low voltage and

provided by power translormer Tl00l. The wound with

switched series for lector

rate

supplies

is placed on the interrelation of circuits

than on detail o{

that the schematics at the rear of

DESCRIPIION FOR

REGUTAIED

Power

Trqnsformer

two equal ll5-volt

in parallel for I l5-volt operation, or

either

230-volt

switch

windings which provide power to the regulated

S100. The

and two separate heater windings.

operation.

SUPPIIES

heater

power

operation

secondaries

b, Regulored Supplies

Four

regulated and two

provided Functional

of the regulated supplies

voltage series-passing

The basic

is

CRl304. applied

puts

other input

divider consisting

samples

A

-50V

base

the

output is

low-voltage regulated nlents

the

supply.

Since the

plies

CRl201 full-wave pacitively

and

with

output as shown in Figures

Block Diagrams

type.

reference for

established by

the frxed drop across zener diode

This constant drop

to the base

of

to difierential amplifier

to the amplifier is connected across a

R1302 through

of

a portion

portion

AD.l potentiometer

of

Ql30l.

output is precisely

also the

are always

-50-volt

is

similar, only the

and CRl202 are

rectifrer

filtered

applied

of the

of this sample voltage

Potentibmeter R 1303

voltage

supplies. Thus, voltage

made in the sequence

supply and

operadon of the low-voltage

circuit. The

by

Cl20l shunted by resistor

to the voltage

are of

all of the

Q1302

-50V

R1303, and is applied

-50

relerence

ending with the

*50-volt supply

connected in

Manual contains the

Main Frame or Indicator

Figures 3-l and 3-2.

is also recom-

It

the circuit description.

tOW

(Figures

vii

unregulated

3-l

for

windings that can be

instrument is

this

I l5V/230V Se-

the

contain four sepa-

supplies are

of the Power Supply. All

the constant-output

regulated

relerence voltage is

or

is

which

Ql30l

regulated output.

volts.

rectifted output

regulator.

one o{ the

and

R1305

is tapped by the

is adjusted so that

The minus

source for the other

starting

regulated

a conventional

DESCRIPTION

be keyed to

this manual

VOTTAGE

qnd

3-2)

primary is

and

3-l

Q1302.

is

3-2,

supplies

in-

The

which

to the

50-volt adjust-

with

+200-volt

sup-

described.

is ca-

RI202

in

Operation

output

base

voltage

and

raise

Q1202.

The increase

applied

Q1203.

of

the

voltage

c.

The

applied to

through

voltage

out

oI conduction

sulting

consisting

brator

the

amplifier plug.in

set

to

CAL.

tion voltage

to-peak

of the regulator is

voltage

tends to decrease.

of the

error

the base voltage of emitter follower driver

in voltage at the

to the base

The

resultant increase in voltage

pass

transistor is

to its proper

Voltoge

power-line

excursions

square wave is applied

output

voltage

Colibrqtor

lrequency

the base

limiting

o{ rhe

resisror R1051. Negative

will drive

at the line-frequency

of

R1053 and R1054.

of one volt peak.to-peak

when the

plus

The

of

transistor

the

excursion

3-3. CRT CtRCUrr

q.

CRT Beqm Control Circuils

The INTENSITY

tive high-voltage

ray

tube grid

FOCUS at the focusing

right at the

ASTIGmatism

voltage at the

both

axes

tion

service adjustment

cathode-ray beam

deflection

tremes of deflection.

voltage to adjust the beam current.

control R2014

screen

asti$matism anodes to focus

simultaneously. The PATTERN CORRec-

system to control the linearity

The BEAM

conrol R2016, part of the nega-

divider is

anode to set the

control R2022F is provided

encounters as it

ROTATE

trol R2022 is provided

L2001

varies cepts compensate alignment.

around

the field

causing it to

the neck

strength which the

for the

rotate. This lunction

earth's

b. High Vohoge Power

Accelerating

obtained

voltages

by

rectifying a

as follows: assume

This will lower

detector

dc amplifier

emitter of

of the series-passing

such as to

value.

voltage

return the output

voltage

calibrator

transistor

at the

from Tt00l is

and positive

the fansistor into

rate.

to

a voltage divider

The attenuated

is coupled to

VOLTS/DIV

100-volt

is

of

supply and the satura-

will determine

of the calibrator

used to

provided

vary

to

second

vary

cross-over point

the cathode-ray

rhe peak-

waveform.

the cathode-

the voltage

tube. The

to

the spot

is set to vary the field the

emerges from the

at the ex-

front-panel screwdriver con-

to

vary

the

current

through coil

of the CRT. The current

beam

CRT

is used to

magnetic

Supply

effect

lor the cathode-ray

high

30-Kc

voltage produced

the the

Ql20l,

Q1202

emitter

Ql05l

and

The re-

cali-

switch is

The

vary

the

inter,

trace

on

tube are

is

in

3-l

section

3

circuit description

-

i€ouiii;dl

Froov

rlrJrrr-;sr- l

uprraer I

I

Figurc 3-1. lype 766H

I;sovEG,Jrrrdl

j200Y

fstrr.Ei]l!-Eiliid

A{PLIFIEi

I

and

+100y

I

Regulororu, Functionol

Block

Diogrcm

3-2

Figwe 3-2. lype 766H

!50V

ond

-50V

Regulolors, Functionol

Elock

Diogrom

by

ransistor

nected

ffansformer

and

the reflected secondary

The

and applied via

work consisting

post-deflection accelerator

The negative

tap

on

which

The

rectiEed output of

filtered by

n€cessary operating potentials fbr the proper intensity

and focusing of the cathode-ray tube.

Regulation

accourplished

output

the HV regulator

HV

oscillator

tude

of oscillation of

manner

preset

level. Potentiometer R2009R, HV ADJ, is pro-

vided to preset to

its proper level.

oscillator

as a

Class C oscillator

Q2002.

This tmnsisfor is

with the primary of

T2001 tuned by the strayed capacitance

impedance.

output of the oscillator is stepped up

a conventional solid state tripler

of CR2050 through CR2052

of the cathode-ray

high-voltage

supply

the secondary winding ol transformer T2001

is connected to a

C2008, C2009, and C20l t and

of the

by

sampling a

applying

and

Q2000

Q2003.

as to restore the high voltage output to its

the output of the

half-wave

-1440

high

voltage

a correction signal back through

to

Q2002

action changes the ampli-

This

Q2003

is derived from

rectifler CR200l.

volts is capacitively

provides

negative

porrion

of

the

to the base of the

and T2001

high'voltage

by T2001

to the

tube.

supply

rectified

in

such a

supply

con-

net.

the

3.4. NORMAI. SWEEP UNBTANKING

The cathode-ray

two

additional

electron beam independently beam gate

turned

blanking, the

on and

tube used in this

beam deflection plates

of the control grid. In

electron

passes

through an aperture in the

oscilloscope

which cut ofi the

beam is

has

always

a

is

circuit

center

of deflection plates,

nxed

plate

X Plug-in.

gate

deflection plates

electron beam blanking blanking behind

Beam control pulses

blanking pulses)

beam

Hence,

sweep

description

of a blanking

volt

+50

is

connected

When the

shield. When the sweep

gate voltage

the blanking

deflection plates are electrically

the display is visible

interval

shield. Behind

one of which is connected

source, while the

to

the

base

time

at the

are

passes

and is

through the aperture in

increases,

plate and the

(trace brightening

can easily be

blanked

-

unblanking

is sweeping,

same potential

the beam is deflected

dc coupled since

only during

during

section

this

shield is a set

to

second deflection

gate from

both beam

and the

ends and

screen is dark.

close to ground.

the retrace and

the un-

and retrace

these

forward

the

lockout interval.

3.5. FASI SINGLE

A back-of-panel

voltage

that both

and high-frequency

NORMAL

SWEEP UNBTANKINS

switch is provided

slide

Main

(beam gate

the high-

on

Frame

models

blanking) and

SINGLE SHOT (grid-cathode blanking) are avail-

able.

Cathode drive for beam brightening is desirable

when high writing

mum

beam current with minimum

When

uansients,

is

nique

it is desired to record high"speed,

the back-of-panel Beam Brightening switch

to FAST SINGLE SWEEP

set

completely turns ofi the electron beam eliminat-

ing the possibility

mation

when the lens is open for an extended

rates are required to assure

spot size.

ONLY, This tech-

film fogging and loss

of

maxi-

single-shot

infor-

of

period.

3

a

the

so

3-3

SECTION

4

4.I.

The tests described

should be

and Ma.intenance

formance of this insrument. These tests

into

sections for simplification

groups

where all test equipment is not available. Secdon required.

If this oscilloscope

Inspectiou

are recommended

instrument

at the

extreme

necessitate mi[or adjustments of Hence, it is suggested that the

ffy the recommended

recentering

their

precision insftument. If, after

tests outlined

inshument will not

assistance

representative should be requested,

4.2. CHECKING l. Check the line fuse (s)

3 amperes; an additional

"M" models: F150,

Check

2.

yalue:

Reguloted

+

*200 volts

3. Examine the

cally damaged components. Correct all

4. Apply power to tJre instrument through a variable

\.-, voltage

- voltage

operation.)

PERFORffTANCE ASSURANCE

TO ASSURE

'I/IAINTENANCE

PERFORIYIANCE

CHECK

in the paragraphs to

performed by Instrument Test

Laboratories to certify proper

and to assist those

where

complete checking is not mandatory, or

paragraph 5-7, lor list of test equipment

5,

NOTE

is checked by a

laboratory, the tests outlined

to certify

has been thoroughly tested

factory. Nevertheless,

environments, or long

adjustments not only

performance. This

rough shipment,

certilying engineer

the controls, but also

range and to familiarize

in the

of the local Fairchild Field

paragraphs

perform

himself with this

performing all the

to specification,

IHE POWER SUPPLY

Fl0l for

line fuse is

amperes.

2

Iuses

of the regulated supplies

Supply Symbol

volts

-50

*50 volts

100

Yolts

source (Variag or an equivalent).

ll5 volts. (Double this value for

to

Fl30

tt 20 Flr0

tl02

instrument

for charred or mechani-

Departments

Receiving

periods may

idle

the

to ascertain

follow, the

to

Engineering

proper value:

provided in the

Fuse

Roting

I ompere

1.5 omperes

I ompere

0.5 ompere

defects.

Set the line

follow

per-

are divided

test

Refer to

below

and aged

controls.

lor

the

proper

for

230-volt

5. Set up the

calibrator

6. Allow

adjustments.

Lower the line

7.

230-volt operation)

and must not

the lower limit o{

operation

as

outlined

Nor€.

with the

volt

supply,

8.

Raise the line voltage

230-volt

and must not

this upper

tion

230-volt operation).

operation)

of the low.voltage power

9. Reset the

4.3. CHECK RIPPTE OF l. Use

4290 Probe.

Ground all chassis to

2.

Set

3.

the oscilloscope for ac coupled

Y

sensitivity to 5

4. Use AUTO triggering with line sync and set

SWEEP

output of each power supply as listed below. (For line

frequencies

twice the line frequency.)

4.4.

of

Type 4290

square wave; rise

ringing

RATE switch to 5

5. Measure the amount of

Reguloted

Sspply Ripple Voltqge Test Point

-50

*50 volts

+ 100 volrs

200

+

CATIBRATOR

Woveshope

o.

l. Adjust

mv/cm

20

jack

on

2. Observe a I volt

should be

oscilloscope to obtain

signal.

minutes Ior

20

be

erratic.

of the low-voltage

in

Section 5

Always

-50-volt

check the regulated

supply and

be erratic. Il instability is noted

limit of line voltage is reached,

line

a Type

volts

704

mv/cm.

other thau 60

l0 millivolis

20 millivolts

30

volt5 65 millivolts

the Type

and connect

the front

Attenuator

time to be

less than

TEST

six cycles

warmup before making

voltage to I05 volts (210 volts for

. The

disptay

should

remain stable

If instabitity is noted before

the line

. The display should remain

voltage

CHECK

Check

704 Oscilloscope for

panel

voltage

regulated

is reached, check

power supplies

of this lnstruction Manual.

voltages

ending with the

to 125 volts (250 volts for

supplies.

to 115 volts (230 volts for

IOW-VOIIAGE

Test Oscilloscope with a Type

power-line

ground.

input

mS/CM.

120-cycle

cycles, the

p-p p-p

millivolts

p-p

the Y INPUT

the

of

Probe.

cm) peak-to-peak,

(5

than

less

5/o (50

ripple at

ripple will

mox TPl3ol mox TPI2oI mox TPI l0l mqx TPI 001

Main Frame via the

20 g,sec.

mv

of the

starting

+200-

stable

before

check opera-

SUPPTIEs

and set

a sensitivity

to rhe CAL

60-cycle

Tilt

or

2.5

mm) .

any

the

be

and

4-l