Kenwood CS-5230 Manuale utente

40MHz

READOUT

OSCILLOSCOPE

CS-5230

40MHz

OSCILLOSCOPE

CS-5235

SERVICE

MANUAL

KENWOOD

CORPORATION

CH?

OSU

RP

OSa8

A

fA

fh

‘\

Vy

VA

|

:

WARNING

The

following

instructions

are

for

use

by

qualified

personnel

only.

To

avoid

electric

shock,

do

not

perform

any

servicing

other

than

contained

in

the

operating

instructions

unless

you

are

qualified

to

do

so.

CONTENTS

ADJUSTMENT.

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TROUBLESHOOTING.

...........ccccsccseesesneenene

PARTS

LIST

......cscescsccssrsssssescesrsenccssesssnsenasnes

DISASSEMBLY

.........ccccscsessessseeeseseneeeeeeeees

PARTS

LIST

(ELECTRICAL)

SCHEMATIC

DIAGRAM

...........cccesseeseeers

P.C.

BOARD

........seccssssssssccssetssesseseussenessensecsersensecsesnessseneuseessensesneeeseassnessesasnenseeateansnes

SEMICONDUCTORS

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SPECIFICATIONS

Type

150

mm

rectangular

tube

with

an

integral

graticule

Acceleration

voltage

Approx.

12

kV

Effective

area

8

X

10

divisions

(1

division

=

10

mm)

VERTICAL

AXIS

(COMMON

TO

CHANNELS

1

AND

2)

Sensitivity

(+10

to

+85°C)

;

1

mV,

2

mV/div

:

+5%,

5

mV

to

5

V/div:

43%

Attenuation

1-2-5

steps,

12

ranges,

fine

control

between

ranges

Input

impedance

1

MQ

+

2%,

approx.

25

pF

5mV

to

5V/div

DC

:

DC

to

40

MHz

AC

:

5Hz

to

40

MHz

DC:

DC

to

20MHz,

AC:

5Hz

to

20MHz

Frequency

response

(-3

dB)

(+10

to

+35°C)

Rise

time

(+10

to

+35°C)

Signal

delay

time

The

leading

edge

may

be

checked

using

a

square

wave

of

the

rise

time

less

than

that

of

this

model.

Crosstalk

-40

dB

or

less

(at

1

kHz)

A\Maximum

input

voltage

500

Vp-p

or

250

V

(DC+AC

peak,

1

kHz

or

less)

VERTICAL

AXIS

(CH3)

Sensitivity

(+10

to

+385°C)

0.1

V/div:

=3%

InV

to

2mV/div

5mV

to

5V/div

Approx.

8.8

ns

ImV

to

2mV/div

Approx.

17.5

ns

Input

impedance

IMQ

+

2%,

approx.

25

pF

Fre

c

sponse

(-3

dB

eroapency

rgsnayse

C8

a)

DC

to

40

Mii

Rise

time

(+10

to

+35°C)

Approx.

8.8

ns

Signal

delay

time

The

leading

edge

may

be

checked

using

a

square

wave

of

the

rise

time

less

than

that

of

this

model.

A\Maximum

input

voltage

100

Vp-p

or

50

V

(DC+AC

peak,

1

kHz

or

less)

Operat

ion

Single

trace:

CHl,

CH2,

CH3

or

ADD

single

trace

operation

Multi-trace

:

2

to

4

traces

of

CH1,

CH2,

CH3

and

ADD

ALT/CHOP:

Display

by

selecting

ALT

and

CHOP

ADD

:

Composite

waveform

of

CHI

and

CH2

signals

are

displayed.

SPECIFICATIONS

Chop

frequency

Approx.

250

kHz

(in

multi-trace

operation)

Channel

polarity

Normal

or

inverted,

CH2

only

inverted

Horizontal

axis

(CH2,

except

for

10

MAG

operation)

Sensitivity

(+10

to

+35°C)

Same

as

vertical

axis

(CH2)

Input

impedance

Same

as

vertical

axis

(CH2)

Prequency

respguse

€3

dB)

DC:

DC

to

1

MHz,

AC:

5

Hz

to

1

Miz

X-Y

phase

difference

1

3°

or

less

at

100

kHz

Operation

mode

X-Y

mode

is

selected

with

H.

MODE

CHI:

Y-axis,

CH2:

X-axis

AMaximum

input

voltage

Same

as

vertical

axis

(CH2)

SWEEP

Sweep

types

:

A

sweep

ALT

:

Alternate

A

sweep

and

B

sweep

B

:

B

sweep

X-Y

:

X-Y

oscilloscope

operation

Sweep

time

|

A

sweep

0.5s

to

0.1

us/div

(410

to

+85°C)

+3%

1-2-5

steps,

21

ranges,

fine

adjustment

between

ranges

B

sweep

ee

to

0.1

us/div

x

0

1-2-5

steps,

18

ranges,

fine

adjustment

betwen

ranges

meee

prado

er

aaa

x10

+

5%

(48%

for

over

0.5

ns/div)

Linearity

(+10

to

+35°C)

+3%

(5%

in

X10

MAG

operation)

HOLDOFF

Continuously

variable

from

A

sweep

NORM

position

Trace

Separation

B

sweep

is

continuously

variable

by

+4

divisions

or

more

with

respect

to

A

sweep.

Delayed

sweep

operation

Continuous

delay

operation

(AFTER

DELAY)

Synchronous

delay

operation

(B

TRG'D)

:

Synchronous

with

the

trigger

signal

Delay

time

Continuous

control

by

0.2

to

10

divisions

for 0.5

div

to

maximum

speed

sweep

[CS

-

5230]

:

+(3%

of

set

value+1%

of

full

scale)+(0

to

300

ns)

[CS

-

5235]

:

Reading

on

CRT

+4%

(0

to

300

ns)

Delay

time

error

(+10

to

+35°C)

Delay

jitter

10000

:

1

of

a

value

10

times

as

high

as

A

sweep

setting

SPECIFICATIONS

TRIGGERING

,

Trigger

modes

AUTO

:

Automatic

free

running

with

no

signal

NORM

:

Triggered

sweep

FIX

:

Sweep

at

triggering

point

set

to

center

of

signal

amplitude

SINGLE:

Single

sweep

mode

RESET

:

Restarting

single

sweep

operation

VERT:

Input

signal

selected

for

V.

mode

CH1

:

Channel

1

input

signal

CH2

:

Channel

2

input

signal

CH3

:

Channel

3

input

signal

:

Commercial

power

line

Trigger

signal

sources

AC

:

AC

coupling

from

10

Hz

HFrej

:

Low-pass

filter

coupling

up

to

30

kHz

DC

:

DC

coupling

TV

FRAME:

Composite

video

signal,

vertical

synchronization

separation

TV

LINE

:

Composite

video

signal,

horizontal

synchroni-

zation

separation

Trigger

coupling

(For

trigger

sensitivity,

see

the

table

below.

)

Trigger

sensitivity

(+10

to

+35°C)

Sensitivity

(Amp1itude)

10Hz

to

20MHz

Idiv

10Hz

to

30kHz

Idiv

DC

to

20MHz

Idiv

20M

to

40MHz

1.

5div

HDTV

video

signal

AUTO

:

Same

as

above

specifications

for

above

40Hz.

(The

table

shows

the

sensitivities

in

terms

of

the

amplitude

displayed

on

the

CRT.

)

Qmin.

for

the

HFrej

sensitivity

shows

that

the

amplitude

necessary

for

synchroniza-

tion

increases.

)

COUPLING

Signal

frequency

FIX

*

:

Same

as

above

specifications

for

above

50Hz.

SPECIFICATIONS

CALIBRATION

SIGNAL

:

POSITIVE

SQUARE

WAVE,

1

Vp-p

23%,

APPROX. 1

kHz

100

Vp-p

or

50V

(DC+AC

peak)

Input

impedance

(+10

to

+385°C)

AMaximum

input

voltage

CHi

OUTPUT

SIGNAL

(WITH

50

Q

LOAD)

Output

voltage

Approx.

50

mVp-p/div

Frequency

100

Hz

to

20

MHz

response

(-3dB)

|

5

mV

to

100

Hz

to

40

MHz

TRACE

ROTATION

:

TRACE

ANGLE

1S

ADJUSTABLE

WITH

A

SEMI-FIXED

CONTROL

ON

PANEL.

POWER

SUPPLY

Voltage

100/120/220/230

VAC

+

10

%

50

Hz

or

60

Hz

Power

consumption

Approx.

43

W,

39

W

Approx.

52VA,

49VA

DIMENSIONS

AND

WEIGHT

(VALUES

ENCLOSED

IN

PARENTHESES

INCLUDE

PROJECTIONS.

)

300

mm

(300

mm)

150

mm

(172

mm)

400

mm

(469

mm)

Frequency

Aprrox.

8.7

kg

OPERATING

TEMPERATURE

AND

H

Operating

temperature

and

humidity

Storage

temperature

and

humidity

UM

|

DITY

0

to

40°C,

85%

RH

or

less

—20

to

70°C,

85%

RH

or

less

ACCESSORIES

Probe

PC-33

:

10

MQ

+1%,

22

pF+

10%,

10:

1

[CS-5230]

PC-35

:

10

MQ

1%,

19.5

pF+

10%,

10:

1

[CS-5235]

Instruction

manual

1

copy

Adjusting

screwdriver

a

Replacement

fuse

1

AX2

(for

100

V

area)

630

mAX2

(for

200

V

area)

SPECIFICATIONS

[The

specifications

shown

below

do

not

apply

to

the

CS-5235.]

READOUT

CH1

and CH2

scale

factors

(with

probe

detection),

CH3

scale

factor

(0.1

V/div

fixed,

with

no

probe

detection),

V-UNCAL,

ADD,

INV,

A/B

sweep

scale

factors

(MAG-converted),

sweep

-

UNCAL,

DELAY

TIME,

TRIG’D,

X-Y

Set

values

AV1

:Displayed

in

voltage

with

conversion

according

to

CH1

scale

factor

Cursor

modes

(Between

AREF

and

A

cursors)

AV2

:Displayed

in

voltage

with

conversion

according

to

In

X-Y

mode,

only

AVI]

CH2

scale

factor

may

be

set.

AV3

:Displayed

in

voltage

with

conversion

according

to

CH3

0.1

V/div

AT

:Displayed

in

time

with

conversion

according

to

A

sweep

scale

factor

1/AT:Displayed

in

frequency

with

conversion

according

to

A

sweep

scale

factor

In

V,

H-VARI

or

RATIO:Voltage

ratio

and

time

ratio

are

displayed,

UNCAL

mode

with

5

divisions

on

the

CRT

as

100%.

PHASE:Phase

difference

is

displayed,

with

5

divisions

on

the

CRT

as

360°

.

Resolution

:

10

bits

Measuring

error:

+4%

Measuring

range:

+3.6

divisions

or

more

vertically

from

CRT

center.

+4,.6

divisions

or

more

horizontally

from

CRT

center.

Cursor

measurement

WiThe

specifications

shown above

are

subject

to

change

without

notice.

SAFETY

Before

connecting

the

instrument

to

a

power

source,

care-

fully

read

the

following

information,

then

verify

that

the

proper

power

cord

is

used

and

the

proper

line

fuse

is

installed

for

power

source.

The

specified

voltage

is

shown

at

the

fuse

holder

of

the

AC

inlet.

If

the

power

cord

is

not

applied

for

specified

voltage,

there

is

always

a

certain

amount

of’danger

from

electric

shock.

Line

voltage

This

instrument

operates

using

ac-power

input

voltages

that

100/120/220/230

V

at

frequencies

from

50

Hz

to

60

Hz.

Power

cord

The

ground

wire

of

the

3-wire

ac

power

plug

places

the

chassis

and

housing

of

the

oscilloscope

at

earth

ground.

Do

not

attempt

to

defeat

the

ground

wire

connection

or

float

the

oscilloscope;

to

do

so

may

pose

a

great

safety

hazard.

The

appropriate

power

cord

is

supplied

by

an

option

that

is

specified

when

the

instrument

is

ordered.

The

optional

power

cords

are

shown

as

follows

in

Fig.

1.

Plug

configuration

Power

cord

and

plug

type

North

American

120

volt/60

Hz

Rated

15

amp

(12

amp

max;

NEC)

Universal

Europe

220

volt/50

Hz

Rated

16

amp

Line

fuse

The

fuse

holder

is

located

on

the

rear

panel

and

contains

the

line

fuse.

Verify

that

the

proper

fuse

is

installed

by

replacing

the

line

fuse.

Voltage

conversion

This

oscilloscope

may

be

operated

from

either

a

100

V

to

230

V,

50/60

Hz

power

source.

Use

the

following

procedure

to

change

from

100

to

230

volt

operation

or

vice

versa.

1.

Remove

the

fuse

holder.

2.

Replace

fuse

F

1

with

a

fuse

of

appropriate

value,

1

amp

for

100

VAC

to

120

VAC

operation.

630

m

amp

for

220

VAC

to

230

VAC

operation.

3.

Reinsert

it

for

appropriate

voltage

range.

4.

When

performing

the

reinsertion

of

fuse

holder

for

the

voltage

conversion,

the

appropriate

power

cord

should

be

used.

(See

Fig.1.)

Factory

installed

Line

cord

instrument

fuse

plug

fuse

Parts

No.

for

power

cord

1A,

250

V

Fast

blow

E30-1951-05

6

x

30

mm

North

Europe

630

mA,

250

V

Slow

blow

5

x

20

mm,

E30-1952-05

Other

Europe

630

mA,

250

V

Slow

blow

6

x

30

mm

U.K.

240

voit/50

Hz

Rated

13

amp

630

mA,

250

V

Slow

blow

E30-1947-05

6x

30

mm

Australian

240

volt/50

Hz

Rated

10

amp

630

mA,

250

V

Slow

blow

E30-1821-15

6

x

30

mm

North

American

240

volt/60

Hz

Rated

15

amp

(12

amp

max;

NEC)

630

mA,

250

V

Slow

blow

6x

30mm

Switzerland

240

volt/50

Hz

Rated

10

amp

630

mA,

250

V

Slow

blow

6x30

mm

Fig.

1

Power

Input

Voltage

Configuration

CIRCUIT

DESCRIPTION

VERTICAL

PREAMPLIFIER

UNIT

CH1,

CH2

Each

of

the

CH1

and

CH2

inputs

passes

through

an

AC/DC/GND

switch

and

enters

the

1st

attenuator

(1/1,

1/10,

1/100).

The

1stattenuator

is

used

in

combination

with

the

2nd

attenuator

(1/1,

1/2,

1/4,

1/10)

and

the

5-fold

function

of

the

2nd

amplifier,

to

switch

the

12

vertical

ranges.

The

head

amp

is

composed

of

Q102

and

U101

(Q202

and

U201)

and

isa

1/1

buffer

amp

with

an

input

impedance

of

1

megohms

and

used

for

conversion

of

impedance.

Q102

(Q202)

is

the

source-follower.

This

head

amp

is

installed

between

the

1st

and

2nd

attenuators.

Starting

from

the

2nd

amp,

this

unit

takes

the

differential

amplifier

configuration.

The

functions

of

U102

(U202)

include

the

variation

and

inversion

functions.

The

variation

function

allows

to

vary

the

gain

continuously

according

to

the

voltage

applied

to

5.

The

inversion

function

allows

to

invert

the

phase

according

to

thevoltages

applied

to

pins

6

and

7.

As

this

function

is

provided

only

for

CH2,

CH1

is

fixed.

At

the

CH2

side,

switch

is

done

by

Q215.Q103

(0203)

is

the

regulated

current

supply

for

U102

(U202).

Q106

and

Q107

(Q206

and

Q207)

form

an

emitter-grounded

amp.

Q108

to

Q111

(Q208

to

Q211)

form

the

cascode

amp

of

the

differential

amp.

The

vertical

position

can

be

moved

by

regulating

the

current

applied

to

the

emitter

of

Q111

(Q211)

based

on

the

panel

operation.

CH3

With

CH3,

the

attenuator

is

fixed.

The

signal

impedance

is

converted

by

the

buffer

amp

of

source

follower

Q303

and

regulated

current

supply

Q304

and

the

signal

is

sent

to

emitter-

follower

Q305.

Q305

is

the

signal

side

input

stage

of

the

differential

amp.

Emitter-follower

306

is

the

input

stage

of

a

constant-potential

differential

amp.

The

outputs

from

Q305

and

Q306

are

input

to

the

differential

type

cascode

amp

formed

by

0307,

0308,

0310

and

Q311.

The

current

of

the

cascode

amp

is

determined

by

regulated

current

supply

Q309.

The

vertical

position

can

be

moved

by

regulating

the

current

applied

to

the

emitter

of

Q311

based

on

the

panel

operation.

Channel

selector,

delay

line

drive

‘As

for

the

outputs

from

the

position

amps

of

the

channels,

only

the

signal

of

thechannel

with

which

the

cathodes

of

CH1

-D104,

D105,

CH2

-

D204,

D205,

CH3

-

D301,

D302,

D304,

D305

are

turned

“H”

by

the

signals

from

V-MODE

LOGIC

is

sent

through

CH1

-

D103,

D106,

CH2

-

D203,

D206,

CH3

-

D303,

D306

and

transmitted

to

the

delay

line

driver.

Q2

and

Q3

form

a

feedback

amp.

Q1

lets

the

excessive

bias

current

flow

when

CH1

or

CH2

is

in

ADD

mode.

Trigger

amp,

trigger

selector

With

CH1

(CH2),the

differential

outputs

from

U102

(U202)

are

input

to

the

emitter-followers

Q152

and

Q153

(0252

and

0253),

where

Q153

(Q253)

forms

a

cascode

amp

with

0114

(Q214).

With

CH3,

the

signal

after

the

buffer

amp

is

sent

through

the

buffer

of

emitter-follower

0314,

feedback

amp

Q312

an

output

as

current

from

the

collector

of

emitter-follower

0313.

Only

the

signal

of

the

channel

with

which

the

cathode

of

CH1

-

D108,

CH2

-

D208,

CH3

-

D308

is

turned

“H”

by

the

signal

from

the

trigger

controller

is

sent

through

CH1

-

D107,

CH2

-

D207,

CH3-

D307

and

output

as

current

to

the

Horizontal

unit.

Q31

the

excessive

bias

current

flow

when

CH1

or

CH2

is

in

ADD

mode.

CH1

OUT

The

CH1

outputis

sent

from

the

collector

of

Q152,

through

emitter-

follower

Q51

and

output

at

CH1

OUT

of

the

Final

unit.

Trigger

controller

The

data

on

the

trigger

source

set

on

the

panel

is

input

to

1

of

U1

and ”H”

or

“L"

is

output

at

pins

4

to

8

according

to

the

set

state.

U2

is

used

to

switch

between

the

data

from

U1

and

the

CRT

display

data

of

each

channel

from

V-MODE

LOGIC.

If

the

current

mode

is

not

V

mode,

the

former

data

is

selected.

If

the

current

mode

is

V

mode,

the

latter

data

is

selected

for

use

in

controlling

the

trigger

selector.

Among

CH1

-

U2

7,

CH2

-

U2

9,

CH3

-

U2

12,

the

terminal

set

with

the

panel

is

turned

“H”".

V-MODE

LOGIC

U3

and

U4

generates

a

signal

synchronized

with

the

display

channel

select

signal

from

the

panel

and

the

end

of

horizontal

sweep,

anda

signal

for

controlling

the

channel

selector

based

on

the

CHOP

signal.

(Figure

1)

Q34

cuts

off

the

power

supply

to

U4

only

at

the

instant

the

channel

switch

is

pressed,

in

order

to

prevent

malfunction.

Vertical

range

converter

U401,

U403,

$102

and

$202

output

the

vertical

range,

CAL

and

UNCAL

data

by

turning

them

into

analog

values

using

an

opamp

for

use

as

the

R/O

data.

(Figures

3,

4)

Horizontal

range

converter

U402

and

$401

output

the

horizontal

range

data

using

an

opamp,

as

analog

values

for

R/O

data.

(Figure

5)

U404

(for

main

sweep),

U405

(for

sub-sweep)

and

S401

are

used

to

switch

the

reference

voltage

for

letting

the

sweep

current

of

the

1-2-5

steps

of

horizontal

sweep

flow.

(Figure

2)

FINAL

UNIT

Final

amplifier

The

signal

sent

from

the

vertical

preamp

through

the

delay

line

is

input

to

the

feedback

amp

of

Q1

and

Q2.

During

A

ALT

B

sweep,

the

variation

of

the

vertical

position

of

sweep

B

is

controlled

by

the

current

applied

to

the

base

of

Q2

based

on

the

panel

operation.

Q3,

4,

Q105,

Q106

and

U1

are

used

to

amplify

the

vertical

signal

|

10

CIRCUIT

DESCRIPTION

and

U1,

Q105

and

0106

are

used

to

amplify

the

R/O

characters.

U1

is

used

to

switch

between

the

vertical

signal

and

R/O

signal.

Q9-012,

0113

and

Q114

are

cascode-connected

for

use

in

driving

the

CRT.

AC

inlet,

fuse

An

external

commercial

supply

voltage

switch

and

fuse

holder

are

provided.

Line

filter

A

filter

for

elimination

of

common

mode

noise

and

normal

mode

noise

is

provided.

CH1

OUT

The

signalfrom

the

vertical

preamp

is

output

externally

via

Q201

and

Q202

as

a

signal

with

50-ohm

impedance.

HORIZONTAL

UNIT

Trigger

The

trigger

signal

supplied

from

the

Vertical

unit

(X73-2070)

is

AC/DC

coupled

and

the

trigger

level

is

added

to

it.

The

obtained

signal

is

inout

to

the

trigger

shaping

circuit

to

become

a

pulse

signal.

If

FIX

is

selected,

the

trigger

level

is

fixed

so

that

it

is

always

around

the

center

of

the

waveform.

With

TV-V,

the

composite

video

signal

is

separated

by

the

V

sync

separator

and

input

to

the

trigger

shaping

circuit.

With

TV-H,

the

composite

video

signal

is

separated

by

the

H

sync

separator

and

input

to

the

trigger

shaping

circuit.

HFrej

is

used

to

apply

a

50

kHz

LPF

to

the

trigger

signal.

The

polarity

of

the

trigger

pulse

signal

can

be

changed

with

SLOPE

+/-.

The

output

signal

is

input

to

the

sweep

logic

circuit.

There

is

an

additional

circuit

which

applies

the

trigger

signal

to

the

sweep

logic

in

case

the

trigger

pulse

signal

has

not

been

input

for

a

certain

period

and

auto

free-run

mode

has

been

selected.

Sweep

When

the

trigger

pulse

is

input

to

the

sweep

logic,

the

sweep

gate

is

activated

and

the

sweep

wave

is

output.

When

the

sweep

wave

reaches

a

certain

level,

the

sweep

stop

circuit

is

activated

to

close

the

sweep

gate

and

end

sweep.

When

sweep

stop

is

activated,

the

hold-off

circuit

is

activated

and,

in

a

certain

period

after

it,

the

sweep

logic

enters

the

trigger

standby

state.

The

delayed

sweep

is

performed

either

as

the

AFTER

DELAY

sweep

or

B

TRIG’D

sweep.

With

the

AFTER

DELAY

sweep,

the

voltage

level

of

the

main

sweep

wave

and

the

voltage

set

with

DTP

are

compared

and

delayed

sweep

is

performed

using

the

result

signal

as

the

trigger.

With

the

B

TRIG'D

sweep.

sweep

is

triggered

by

the

signal

input

after

the

voltage

level

of

sweep

wave

have

reached

the

voltage

set

with

DTP.

In

case

ALT

sweep

is

set,

the

main

sweep

and

delayed

sweep

are

performed

alternately.

Horizontal

amp

This

circuitry

switches

between

the

sweep

wave

generated

in

the

sweep

block

and

the

X

signal

and

add

H-POSITION.

After

being

magnified

by

10

times

if

MAG

has

been

selected,

the

signal

is

input

to

the

R/O

switch.

Here,

the

R/O

signal

is

added

to

the

vertical

signal

and

the

signal

is

amplified

by

the

final

amp

to

a

high

enough

voltage

level

to

drive

the

CRT.

Intensity

circuit

The

Z

signal

is

generated

with

the

sweep

gate

of

the

main

sweep

and

that

of

the

delayed

sweep.

During

ALT

sweep,

a

waveform

for

increasing

the

intensity

of

the

delayed

sweep

section

is

generated

with

the

main

sweep.

The

voltage

set

with

the

INTEN

potentiometer

is

added

to

the

X

signal

and

the

voltage

set

with

the

R/O

INTEN

potentiometer

is

added

to

the

R/O

blanking

signal

and

they

are

input

to

the

high

voltage

circuit.

The

high

voltage

circuits

generates

the

CRT

cathode

voltage,

G1

voltage

and

P1

voltage

based

on

the

intensity

signal

and

the

FOCUS

potentiometer.

The

cathode

voltage

is

controlled

always

constant

by

the

opamp.

For

use

with

the

after-accelerating

CRT,

the

anode

voltage

is

also

generated

by

the

high

voltage

circuit.

Power

supply

AC

voltages

of

+14.8

V,

-14.8

V,

+6

V,

-6

V,

+67

V

and

+170

V

are

input

from

the

transformer,

and

they

are

turned

into

stable

DC

voltages

of

respectively

+12

V,-12

V,

+5

V,

+55

Vand

+140

V,

which

are

supplied

to

their

respective

units.

CHOP

To

observe

signals

of

multiple

channels

simultaneously,

the

vertical

amp

is

switched

with

the

CHOP

signal.

PANEL

UNIT

This

unit

sends

the

potentiometer

and

switch

data

from

the

control

panel

to

other

units.

A

limiting

circuit

is

provided

to

prevent

the

CHIP

operation

while

multi-channel

operation

is

not

selected

even

when

the

CHOP

key

Is

pressed.

The

voltage

setting

of

DTP

is

made

by

the

opamp

in

the

range

from

0

to

+4

V.

The

CAL

signal

is

a

1

kHz,

1

Vp-p

square

wave.

The

intensity

is

controlled

by

the

PWM

based

on

the

output

from

the

original

oscillator

of

CAL.

R/O

UNIT

The

R/O

unit

(X77-1870-00)

accepts

the

attenuator

and

sweep

data

sent

from

or

through

the

Panel

unit

and

outputs

character

data

to

be

displayed

on

the

CRT.

It

is

composed

of

the

controller

block

(U1,

U2,

U4

U6,

X1),

blanking

circuit

(U5,

U14,

U15,

X2),

A/D

converter

block

(U3,

U16,

U17)

and

character

data

output

block

(U7,

U8

U9,

U10,

U13).

The

controller

block

is

composed

of

the

1-chip

CPU

(with

built-

in

ROM),

RAM,

decoder,

ALE

and

oscillator

x

1.

The

1-chip

CPU

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