Tektronix 285 User manual

INSTRUCTION

MAN

UAL

Serial

Number

Tektronix,

Inc.

Copyright

(©)

1968

by

Tektronix,

Inc.,

Beaverton,

Oregon.

Printed

in

the

United

States

of

America.

All

rights

reserved.

Contents

of

this

publication

may

not

be

reproduced

in

any

form

without

permission

of

the

copyright

owner.

S.W.

Millikan

Way

@

P.

©.

Box

500

@

Beaverton,

Oregon

97005

@

Phone

644-0161

@

Cables:

Tektronix

070-0903-00

1168

Type

285

Power

Supply

for

S-50

Series

Heads.

Fig.

1-1.

®

Type

285

Type

285

SECTION

1

TYPE

285

SPECIFICATION

General

Information

The

Type

285

Power

Supply

for

S-50

Series

Heads

contains

the

regulated

power

supplies

for

operation

of

either

the

Type

$-50

Pulse

Generator

Head

or

the

Type

S-51

Trigger

Countdown

Head.

It

provides

a

front

panel

trigger

output

jack

for

the

internal

trigger

pulse

of

any

S-50

series

head.

Characteristics

The

following

characteristics

apply

over

an

am-

bient

temperature

range

of

0°

C

to

+50°

C

and

after

a

five-minute

warmup,

provided

the

instrument

has

been

calibrated

at

a

temperature

between

+20°

C

and

+30°

C.

ELECTRICAL

CHARACTERISTICS

Characteristic

Performance

Requirement

Output

Voltage

V

within

2%

+15

V

within

1%

and

-12.2

Maximum

Output

Current

100

mA

from

each

supply

Ripple

1

mV or

Tess

Grounded

Neutral

Distri-

bution

System

115

V

90

VAC

to

136

VAC

230

V

180

VAC

to

272

VAC

Line

Voltage

Range

Line

Frequency

50 Hz

to

400

Hz

Fuse Data

115

V

1/8

A

Slo

Blow

230

V

1/16

A

Slo

Blow

ENVIRONMENTAL

CHARACTERISTICS

Storage

Operating

Temperature--

-40°

¢

Temperature--

As

stated

to

+65°C

above

in

the

Electrical

Characteristics

table.

Altitude--

To

50,000

Altitude--

to

15,000

feet

MECHANICAL

CHARACTERISTICS

Dimensions--

Height

3

1/8

inches

Width

5

inches

Length

8

inches

Approximate

dimensions

include

switch

and

cord

holders.

Construction--

Aluminum

allow

chassis

with

epoxy

laminated

circuit

boards.

Both

circuit

boards

are

removable

with-

out

using

a

soldering

iron.

The

front

panel

is

anodized

aluminum.

The

textured

aluminum

cover

has

blue

vinyl

paint.

Accessories---

Standard

accessories

supplied

with

the

Type

285

are

listed

in

the

Me-

chanical

Parts

List.

1-1

Type

285

SECTION

2

OPERATING

INSTRUCTIONS

General

Information

The

Type

285

Power

Supply

for

S-50

Series

Heads

is

intended

for use

with

special

heads

such

as

the

Type S-50

Pulse

Generator

Head

or

the

Type

S-51

Trig-

ger

Countdown

Head.

The

Type

285

provides

the

regula-

ted

supply

voltage

requirements

of

one

Type

S-50

series

head.

Regulated

voltages

are

delivered

to

the

S-50

series

head

through

connector

J40

at

the

rear

of

the

plug-in

compartment.

A

coaxial

connector,

J17,

is

also

located

at

the

rear

of

the

plug-in

compartment.

A

coaxial

cable

within

the

Type

285

connects

J17

to

the

TRIGGER

OUT

con-

nector

(J45),

on

the

Type

285

front

panel.

The

signal

available

at

the

TRIGGER

OUT

connector

depends

on

the

type

of

S-50

series

head

plugged

into

the

Type

285.

See

the

instruction

manual

for

your

S-50

series

head

for

further

information.

Operating

Information

A

line

voltage

Selector

switch

on

the

Type

285

rear panel

permits

operation

from

115

VAC

or

230

VAC.

Be

sure

the

switch

is

set

to

the

position

corresponding

to

the

line

voltage

to

be

utilized,

and

connect

the

Type

285

power

cord

to

the

AC

line.

The

S-50

series

head

is

plugged

into

the

compart-

ment

provided

in

the

Type

285

front

panel.

To

insert

a

S-50

series

head,

slide

the

unit

completely

into

the

compartment

in

the

Type

285,

leaving

the

latch

at

the

bottom

of

the

unit free

to

move.

Push

the

latch

knob

to

lock

the

S-50

series

head

in

place.

To

remove

the

head,

pull

the

latch

knob

away from

the

panel.

See

Fig. 2-1.

A

toggle switch

on

the

front

panel

of

the

Type

285

turns

the

instrument

on

or

off.

A

POWER

indica-

tor

lights

when

the

POWER

switch

is

on

and

the

instru-

x

cee

TEKTRONIX,

INC.,

PO!

ment

is

connected

to

the

line

voltage.

'

a

ay

.

e

Coan

TYPE

285

POWER

SUPPL

ap

oe

7.

-

—

-

Fig,

2-1.

$-50

series

head

installed

in

the

Type

285.

2-1

Type

285

SECTION

3

CIRCUIT

DESCRIPTION

The

Type

285

Power

Supply

develops

regulated

vol-

tages

of

-12.2

V

and

+15

V

for

the

Type S-50

series

head.

The

Type

285

Power

Supply

operates

from

a

115

VAC

or

230 VAC

power

source.

Switch

SW2

must

be

placed

in

the 115

V

position

if

the

power

source

is

115

VAC.

The

primary

windings

of

transformer

T2

are

connected

in

parallel

and

fuse

Fl

protects

the

Type

285

Power

Supply

in

case

of

overload.

If

the

power

source

is

230

VAC,

place

switch

SW2

in

the 230

V

position.

The

pri-

mary

windings

of

transformer

T2

are

connected

in

series.

Fuse

F2

is

connected

in

series

with

Fl,

and

F2

is

the

controlling

fuse.

A

POWER

indicator

light

is

connected

across

the

secondary

winding

of

the

-12.2

V

Power

Sup-

ply.

POWER

switch

SW1

connects

both

sides

of

the

pow-

er

line

to

the

Type

285

Power

Supply.

The

+15

V

Power

Supply

is

composed

of

transformer

T2

secondary

winding

(terminals

5

and

6

on

the

transfor-

mer),

full

wave

bridge

rectifier

D020,

filter

capacitor

C20,

error

signal

amplifier

Q24,

inverter

amplifier

Q33 and

series

regulator

Q35.

The

regulator

action

is

as

follows:

(Assuming

a

positive-going

change

in

output

voltage.)

Q24A

is

biased

at

+9

V

by

Zener

diode

022.

Q24B base

is

biased

by

the

voltage

divider

network

R29,

R30

and

R31.

R30

sets

the

Power

Supply

output

to

+15

V.

The

error

sig-

nal

is

applied

to

Q24B

base

through

the

voltage

divider

R29,

R30,

and

R31.

(C29

couples

fast-rise

signals

to

Q24B base

for

greater

output

from

Q24B.)

Emitter

fol-

lower

Q24B

drives

Q24A

emitter.

The

in-phase

error

output

signal

at

the

junction

of

R26 and

R27

drives

Q33

base.

Q33

inverts

and

amplifies

the

signal

to

drive

035,

which

serves

as

a

variable resistor

in

series

with

the

load.

The

signal

to

Q35

reverse

biases

the

transistor

to

decrease

the

current

through

it

and

the

load.

The

decreased

current

through

the

load

lowers

the

load

voltage

to

the

desired

value.

Turning

on

the

Type

285

with

the

load

connected,

at

first

most

of

the

supply

voltage

appears

across

Q35

which

is

cut

off

(it

nas

very

high

resistance);

There-

fore,

the

output

voltage

is

about

zero

volts.

Q16

in

the

-12.2

V

Power

Supply

is

also

turned

off

since

that

®

supply

does

not

have

the

+15

V

necessary

for

proper

operation.

Network

R36, R37,

R38

and

D37

applies

for-

ward

bias

and

turns

on

Q35.

With

about

zero

volts

feeding

R37,

(instead

of

the

normal

operating

voltage

of

-12.2

V),

approximately

-27

volts

at

the

junction

of

R37-R38,

D37

is

biased

into

conduction.

The

resul-

ting

voltage

drop

across

R36

forward

biases

Q35

into

conduction

and

the

+15

volt

Power

Supply

output

rises

to

+15

V

at

which

time

the

-12.2

V

Power

Supply

oper-

ates

properly

and

D37

is

reversed

biased

(cut

off).

Components

not

described

above

provide

the

fol-

lowing

functions:

C22

helps

to

stabilize

Q24A

base

voltage

for

high

frequency

signals

and

to

reduce

the

noise

generated

by

022.

R26

is

a

parasitic

suppressor.

D33

provides

temperature

compensation

for

Q33.

C39

re~

duces

the

high

frequency

output

impedance

of

the

sup-

ply.

The

-12.2

V

Power

Supply

is

composed

of

trans-

former

T2

secondary

winding

(terminals

7

and

8

on

the

transformer),

full

wave

bridge

rectifier

D4,

filter

capacitor

C4,

error

signal

amplifier

Q6,

emitter

fol-

lower

Q12 and

series

regulator

Q16.

The

regulator

action

is

as

follows:

(Assume

a

negative

change

in

output

voltage).

Q6B

base

is

biased

by

the

voltage

divider

R10

and

R11.

R10

is

con-

nected

to

the

+15

V

reference

voltage.

The

error

sig-

nal

is

applied

to

Q6B

by

voltage

divider

R10

and

R11.

(C11

couples

fast

rise

signals

to

Q6B

base

for

greater

output

from

Q6B.)

Emitter

follower

Q6B

drives

Q6A

emitter.

The

in-phase

error

output

signal

at

the

col-

lector

of

Q6A

drives

emitter

follower

Q12.

In-phase

output

from

Q12

emitter

drives

Q16,

which

serves

as

a

variable resistor

in

series

with

the

load.

The

neg-

ative-going

signal

at

Q16

base

reverse

biases

the

tran-

sistor

to

decrease

the

current

through

it

and

the

load.

The

decreased

current

through

the

load

raises

the

voltage

back

to

-12.2

V.

Rl2

is

transistor

Q12's

dissipation

limiting

re-

sistor.

C18

reduces

the

high

frequency

output

impe-

dance

of

the

supply.

3-1

Type

285

SECTION

4

MAINTENANCE

Removal

of

the

Case

Remove

the

screws

holding

the

power

cord

holders

and

the

case

will

slide

off

at

the

rear

of

the

Type

285.

Parts

Removal

and

Replacement

Whenever

a

part

is

replaced,

check

and

adjust

the

power

supplies

as

necessary;

see the

Calibration

sec-

tion.

Most parts

in

the

Type

285

can

be

replaced

with-

out

detailed

instructions.

Parts

ordering

information

is

included

immediately

preceding

the

Electrical

Parts

List

section.

CAUTION

Disconnect

the

power

cord

before

re-

moving

fuses

or

other

components.

Transistor

Replacement.

Transistors

should

not

be

replaced

unless

they

are

actually

defective.

Tran-

sistor

defects usually

take

the

form

of

the

transistor

opening,

shorting

or

developing

excessive

leakage.

To

check

a

transistor

for

these

and

other

defects,

use

a

transistor

curve

display

instrument

such

as

a

Tektronix

Type

575.

However,

if

a

good

transistor

checker

is

not

readily

available,

a

defective

transistor

may

be

found

by

making

in-circuit

voltage

checks,

or

by

substitution.

The

location

of

all

transistors

is

silk-screened

on

the

circuit

board

the

socket

or on

the

chassis

for

the

rear-panel

mounted

power

transistors.

To

check

transistors

using

a

voltmeter,

measure

the

emitter-to-base

and

emitter-to-collector

voltages

and

determine

whether

the

voltages

are

consistent

with

the

normal

resistances

and

currents

in

the

circuit

(see

Fig.

4-1).

Note

the

lead

configuration

in

Fig.

4-2.

If

there

is

doubt

about

whether

the

transistor

is

good

or

not,

substitute

a

new

transistor,

but

first

be

certain

the

circuit

voltages

applied

to

the

transistor

are

correct

before

making

the

substitution.

If

a

tran-

sistor

is

substituted

without

first

checking

out

the

circuit,

the

new

transistor

may

immediately

be

damaged

by

some

defect

in

the

circuit.

4-1

Parts

Replacement.

The

replacement

of

parts

sol-

dered

to

the

circuit

boards

is

as

follows:

1.

Clip

the

leads

of

the

component

to be

re-

placed.

2.

Remove

the

component

from

the

circuit

board.

3.

Remove

the

clipped

leads

individually

from

the

circuit

board.

The

tip

of

the

soldering

iron

should

be

of

copper

with

a

chisel

or

bevel

shape.

To

obtain

a

Tow

working-

tip

temperature,

consider

the

following:

1.

At

slow

soldering

speeds,

a

25-watt

iron

and

1/8

inch

tip.

2.

At

medium

soldering

speeds,

a

4-watt

iron

and

a

3/16

inch

tip.

3.

At

fast

soldering

speeds,

a

50-

or

60-watt

iron

and

a

1/4

inch

tip.

Install

the

new

part, with

leads

bent

to

fit

the

holes

and

clipped

so

they

will

just

protrude

through

the

board,

and

apply

heat

and

solder

for

a

firm

sol-

der

joint.

The

best

type

of

solder

for

use

on

the

Tektronix

circuit

boards

is

a

"eutectic"-type

cored-wire

solder

of

size

#20

AWG,

composed

of

63%

tin

and 37%

lead

with

a

central

core

of

activated

rosin

flux.

Fig.

4-1.

In-circuit

voltage

checks

NPN

or

PNP

transistors.

®

Fig.

4-2.

Lead

configuration

of

transistors

in

the

Type

285.

Circuit

Board

Replacement.

If

a

circuit

board

is

damaged

and

cannot

be

repaired,

the

entire

board,

inclu-

ding

all

soldered-on

components,

should

be

replaced.

The

part

number

given

in

the

Mechanical

Parts

List

is

for

the

completely

wired

board.

Both

circuit

boards,

which

are

mounted

back

to

back

with

plastic

spacer

separation,

are

secured

by

2

chassis

mounting

screws.

Loosen

the

mounting

screws

and

lift both

circuit

boards

from

the

chassis.

Sepa-

Maintenance-Type

285

rate

the

boards

by

gently

pulling

the

+15

V

Regulator

board

upward

from

the

-12.2

V

Regulator

board.

Color-

coded

wires

are

removed

from

the

pins

by

pulling

straight

off

with

long-nosed

pliers.

The

sequence

of

wires

on

the

-12.2

V

Regulator

board

is

listed

in

Table

4-1.

Table

4-1

A

Red

on

White

B

Green

on

White

Pinc

Blue

on

White

0

Grey

on

White

(2)

E

Violet

on

White

(2)

F

White

G

Yellow

on

White

H

Orange

on

White

I

Black

on

White

J

Brown,

Red,

Black

on

White

K

Green, Green,

Black

on

White

To

attach

the

+15

V

Regulator

board

to

the

-12.2

V

Regulator

board,

align

the

pins

and the

mounting

screws

before

easing

the

board

into

position.

Install

the

circuit

boards

and

tighten

the

mounting

screws.

Parts

Locations

All

components

mounted

on

circuit

boards

are

iden-

tified

by

circuit

numbers

and

shown

in

the

photographs

included

in

the

remainder

of

this

section.

Case

Replacement

Align

the

case

so

the

side

adjustment

hole

will

be on

the

left

of

the

285,

by

the

head

opening,

and

the

feet

on

the

bottom.

Slide

the

case

on

the

Type

285

and

attach

the

cord

holders

with

the

mounting

screws.

4-2

Maintenance-Type

285

-

—

pe

Fig.

4-3.

+15

V

Regulator

circuit

board.

——————

i.

Fig,

4-4.

-

12.2

V

Regulator

circuit

board.

Type

285

SECTION

5

PERFORMANCE

CHECK/CALIBRATION

Introduction

This

section

of

the

manual

contains

a

procedure

for

checking

and

calibrating

the

power

supplies

of

the

Type

285.

The

instrument

will

not

require

frequent

calibration,

but

occasional

adjustments

will

be

nec-

essary

aS

components

age

or

are

replaced.

Equipment

Required

The

following

equipment

or

its

equivalent

is

re-

quired

for

calibration

of

the

Type

285.

1.

Autotransformer

with

output

voltage

variable

between

90

and

136

VAC

(or

180

to

272

VAC)

and

a

minimum

rating

of

25

watts.

If

the

autotransformer

does

not

have

an

AC

voltmeter

to

indicate

output

voltege,

mon-

itor

its

output

with

an

RMS

reading

voltmeter

with

a

range

of

at

least

150

(300)

volts.

For

example,

Gen-

eral

Radio

WIOMT3W

Metered

Variac

Autotransformer.

2.

Oscilloscope,

maximum

deflection

factor

of

1

mV¥/div

and

comparison

voltage

for

measurement

of

+15

V

and

-12.2

V

within

0.2%.

Tektronix

Type

W

Plug-In

Unit

with

Type

545B

Oscilloscope

(540

series)

or

Tektronix

Type

3A7

Differential

Comparator

with

Type

3B4

Time

Base

Unit

and

Type

561A

Oscilloscope

(560-Series)

meet

these

requirements.

3.

1X

probe,

Tektronix

P6028.

Tektronix

Part

No.

010-0074-00.

4.

If

a

Type

W

plug-In

Unit

is

not

available,

a

precision

voltmeter

is

needed

that

can

measure

up

to

+15

or

-12.2

V

with

an

accuracy

of

+0.2%.

John

Fluke

Model

801B

meets

the

requirements.

5.

Test

loads

for

power

supplies:

+15

V

supply;

a

150

2,

2

watt,

composition

resis-

tor,

10%

tolerance,

Tektronix

Part

No.

306-0151-00.

-12.2

V

supply;

a

120

2,

2

watt,

composition

resis-

tor,

10%

tolerance,

Tektronix

Part

No.

306-0121-00.

6.

Four

clips,

Mueller

#30

miniature,

to be

at-

tached

to

the

test

load

resistors.

Tektronix

Part

No.

344-0024-00.

PRELIMINARY

INSTRUCTIONS

1.

Disconnect

the

power

cord.

Remove

the

case

of

the

Type

285

by

removing

the

power

cord

holder

screws

and

sliding

the

case

off

to

the

rear.

2.

Connect

the

120

&

resistor

between

A

of

J40

and

ground.

Connect

the

150

2

resistor

between

1,

opposite

A,

and

ground.

3.

Connect

the

Type

285

power

cord

to

the

output

of

the

variable

autotransformer.

4.

Turn

on

the

instrument

power

and

adjust

the

autotransformer

for

an

output

of

115

volts

as

deter-

mined

by

the

LINE

VOLTAGE

SELECTOR,

located

on

the

rear

panel.

5.

Turn

on

the

oscilloscope.

Allow

15

minutes

for

warmup

and

stabilization.

6.

Set

the

oscilloscope

and

Type

W

controls

as

follows:

5-1

Performance

Check/Calibration-Type

285

Fig.

5-1.

Locations

of

test

points

and

adjustment.

R30

+15

Volts

F

Oscilloscope

Triggering

Int,

+,

AC

Stability

Fully

clockwise

Time/cm

1

ms

Type

W

Ve

Range

0

Comparison

Véltage

1500

AC

DC

GND

Input

Atten

10

Display

A-Vc

Millivolts/cm

5

Variable

Calib

PROCEDURE

1.

Check

or

Adjust

Power

Supplies

a.

Set

the

oscilloscope

trace

at

the

graticule

center

line.

Connect

the

1X

probe

to

1

at

the

150

2

resistor

in

the

Type

285.

Fig.

5-1

shows

the

locations

of

test

points

and

the

adjustment.

5-2

b.

Set

the

AC

DC

GND

switch

to

DC

and

the

Vc

Range

switch

to

+11.

c.

Check

that

the

trace

is

at

the

center

line

with

a

comparison

Voltage

setting between

1515

and

1485

(15

volts

41%).

d.

If

the

Comparison

Voltage

is

not

between

1515

and

1485,

adjust

R30,

the

+15

volts

control,

until

the

trace

is

at

the

graticule

center

line

with

Comparison

Voltage

set

at

1500.

e.

Change

the

autotransformer

output

voltage

from

90

volts

to

136

volts

and

check

that

the

+15

V

supply

remains

within

the

1%

tolerance.

f.

Set

the

autotransformer

output

voltage

to

115

volts.

Set

the

Vc

Range

switch

to

0

and the

AC

DC

GND

switch

to

GND.

Connect

the

1X

probe

to

A

at

the

120

2

resistor.

Set

the

trace

at

the

center

line.

g.

Set

the

Comparison

voltage

to

1220.

Change

the

AC

DC

GND

switch

to

DC

and the

Vc

Range

switch

to

-11.

®

h.

Check

that

the

trace

is

at

the

center

line

with

a

comparison

Voltage

setting between

124B

and

1196

(12.2

volts

+2%).

i.

Change

the

autotransformer

output

voltage

from

90

volts

to

136

volts

and

check

that

the

-12.2

volt

supply

remains

within

the

2%

tolerance.

2.

Check

Ripple

a.

Set

the

Vc

Range

switch

to

0

and the

AC

DC

GND

switch

to

AC.

Set

the

Input

Atten

switch

to

1

and

the

Millivoits/cm

switch

to

1.

b.

Set

the

oscilloscope

Time/cm

switch

to

5,

the

Triggering

switch

to

Auto

and

the

Trigger

Slope

switch

to

+

line.

c.

Change

the

autotransformer

output

voltage

from

90

volts

to

136

volts

and

check

that

the

ripple

as

ob-

served

on

the

oscilloscope

does

not

exceed

1

mV

(1

di-

vision);

see

Fig. 5-2.

Measure

from

trace

bottom

at

a

low

point

to

trace

bottom

at

a

high

point.

d.

Connect

the

1X

probe

to

1

at

the

150

aR

resistor.

e.

Change

the

autotransformer

output

voltage

from

90

volts

to

136

volts

and

check

that

the

ripple

does

not

exceed

1

mV

(1

division).

Performance

Check/Calibration-Type

285

Fig.

5-2.

Typical

display

of

ripple.

f.

Turn

the

Type

285

Power

Off

and

disconnect

the

power

cord

from

the

autotransformer.

3.

Check

230—Volt

Operation

a.

Set

the

LINE

VOLTAGE

SELECTOR

switch

on

the

rear

panel

to

230

V.

b.

Connect

the

Type

285

power

cord

to

a

230

V

source

and

set

the

Type

285

Power

On.

c.

Check

the

+15

volt

and

-12.2

volt

supplies,

1,

and

A

of

J40,

as

described

in

step

1.

Tol-

erance

on

the

+15

volt

supply

is

1%

and

on

the

-12.2

volt

supply

tolerance

is

2%.

The

autotransformer

range

for

checking

the

regulation

is

180

through

272

volts.

5-3

NOTES

SECTION

6

Type

285

ELECTRICAL

PARTS

LIST

Values

are

fixed

unless

marked

Variable.

Tektronix

Serial/Model

No.

Ckt.

No.

Part

No.

Disc

Description

Bulb

B3

150-0088-00

Incandescent

2187D

Capacitors

Tolerance

+20%

unless

otherwise

indicated.

C4

290-0394-00

160

uF

Elect.

50

V

10%

cll

283-0032-00

470

pF

Cer

500

V

5%

C18

290-0135-00

15

pF

Elect.

20

V

c20

290-0394~00

160

uF

Elect.

50

V

10%

C22

290-0135-00

15

uF

Elect.

20

V

C29

283-0065-00

0,001

uF

Cer

100

V

5%

C39

290-0135-00

15

uF

Elect.

20

V

D4

A,B,C,D

(4)

%*152-0107-00

D20

A,B,C,D

(4)

*152-0107-00

D22

152-0212-00

D33

152-0141-02

D37

152-0141-02

Fl

159-0063-00

F2

159-0051-00

yi7t

340

131-0581-00

J45*

Q6

151-0249-00

Qi2

*151-0192~+00

Ql6

*151-0148-00

Q24

151-0261-00

Q33

151-0188-00

Q35

*151-0148-00

Semiconductor

Device,

Diodes

Silicon

Zener

Silicon

Fuses

1/8

A

1/16

A

Connectors

12

Pin,

Female

Transistors

Silicon

1See

Mechanical

Parts

List

(*175-1012-00)

@1

Replaceable

by

1N647

Replaceable

by

1N647

1N936

9

V,

5%,

TC

1N4152

3AG

Slo-Blo

Dual

Replaceable

by

MPS-6521

Selected

from

40250

(RCA)

Dual

2N3906

Selected

from

40250

(RCA)

Mechanical

Parts

List—Type

285

Tektronix

Serial/Model

No.

Ckt.

No.

Part

No.

Disc

Description

Resistors

are

fixed,

composition,

+10%

unless

otherwise

indicated.

R6

315+0183-00

18

kQ

1/4

W

5%

R8

315-0752-00

7.5

kQ

1/4

W

5%

R9

315-0224-00

220

ka

1/4

W

5%

R1O

321-0230-00

2.43

kQ

1/8

W

Prec

1%

R11

321-0221-00

1.96

ko

1/8

W

Prec

1%

R12

315-0182-00

1.8

ka

1/4

W

5%

R14

315-0752-00

7.5

kQ

1/4

W

5%

R22

321-0184-00

806

2

1/8

W

Prec

1%

R24

315-0132-00

1.3

kQ

1/4

W

5%

R26

315-0101-00

100

2

1/4

W

5%

R27

315-0622-00

6.2

ko

1/4

W

5%

R29

321-0163-00

487

2

1/8

W

Prec

1%

R30

311-0442-00

250

0,

Var

R31

321-0183-00

787

0

1/8

W

Prec

1%

R33

315-0432-00

4.3

kn

1/4

W

5%

R36

315-0102+00

1

kQ

1/4

W

5%

R37

315-0103-00

10

ka

1/4

W

5%

R38

315-0102-00

1

ko

1/4

W

5%

Switches

Wired

or

Unwired

SW1

260-0834-00

Toggle

POWER

Sw2

260-0675=00

Slide

115/

V

230

V

Transformer

T2

*120-0581-00

Power

6-2

Type

285

SECTION

7

MECHANICAL

PARTS

LIST

FIG.

1

EXPLODED

VIEW

Fig.

&

Q

Index

Tektronix

Serial/Model

No.

t

Description

No.

Part

No.

y

12345

1-1

175=-1012-00

1

CABLE

ASSEMBLY,

RF:

50

2

coaxial,

8.5

inches

er

cee

-

w/snap-on

connector

1

end,

male

BNC

opposite

-2

260-0834-00

1

SWITCH,

toggle

(w/hardware)--ON

cc

cee

-

mounting

hardware:

(not

included

w/switch)

-3

210-0940-00

1

WASHER,

flat,

1/4

ID

x

3/8

inch

OD

-4

333-1102-01

1

PANEL,

front

e-

cree

-

mounting

hardware:

(not

included

w/panel1)

-5

213-0055-00

2

SCREW,

2-32

x

3/16

inch,

thread

forming,

PHS

-6

352-0084-00

1

HOLDER,

neon

-7

378-0541-01

1

FILTER,

lens,

neon

-8

200-0609-00

1

CAP,

lamp

holder

-9

200-0895-00

1

BEZEL,

2.344

x

1.995

x

0.46

inch,

plastic

-10

386-1516-01

1

SUB-PANEL,

front

“ee

eee

-

mounting

hardware:

(not

included

w/sub-panel)

“11

213-0192-00

4

SCREW,

6-32

x

1/2

inch,

Fil

HS

“12

343-0189-00

2

CLAMP,

rim

clenching

-13

426-0440-00

2

FRAME,

side,

left

&

right

“14

255-0249=00

4

CHANNEL,

extrusion,

4

1/2

inches,

Black

Plastic

15

407-0546-00

1

BRACKET,

connector

keer

res

-

mounting

hardware:

(not

included

w/bracket)

-16

211-0538-00

4

SCREW,

6-32

x

5/16

inch,

100°

esk,

FHS

-17

210-0457-00

4

NUT,

keps,

6-32

x

5/16

inch

-18

407-0545-00

1

BRACKET,

support

cee

ee

-

mounting

hardware:

(not

included

w/bracket)

-19

211-0538-00

2

SCREW,

6-32

x

5/16

inch,

100°

csk,

FHS

-20

211-0507-00

1

SCREW,

6-32

x

5/16

inch,

PHS

221

210-0457-00

3.

NUT,

keps,

6-32

x

5/16

inch

22

131-0581-00

1

CONNECTOR,

chassis

mounting,

12

contact,

male

-23

351-0132-00

1

GUIDE,

clip

a

-

mounting

hardware:

(not

included

w/

guide)

~24

213-0082-00

2

SCREW,

4-40

x

1/2

inch,

thread

forming,

PHS

Mechanical

Parts

List—Type

285

FIG.

1

EXPLODED

VIEW

(CONT)

Fig.

&

Q

Index

Tektronix

Serial/Model

No.

¢

Description

No.

Part

No.

Eff

Disc

Yy

12345

1-25

352-0025-00

1

HOLDER,

fuse,dual

eee

-

mounting

hardware:

(not

included

w/holder)

-26

211-0510-00

2

SCREW,

6-32

x

3/8

inch,

PHS

“27

210-0457-00

2

NUT,

keps,

6-32

x

5/16

inch

“28

-2e--

6

1

TRANSFORMER

“eee

=

-

mounting

hardware:

(not

included

w/transformer)

-29

211-0021-00

2

SCREW,

4-40

x

1

1/4

inches,

RHS

-30

210-0586-00

2

NUT,

keps,

4-40

x

1/4

inch

-31

343-0088-00

1

CLAMP, cable,

plastic

~32

441-0808-00

1

CHASSIS,

main

-se

ee

-

mounting

hardware:

(not

included

w/chassis)

-33

210-0457-00

4

NUT,

keps,

6-32

x

5/16

inch

-34

211-0538-00

2

SCREW,

6-32

x

5/16

inch,

100°

csk,

FHS

-35

211-0514-00

2

SCREW,

6-32

x

3/4

inch,

PHS

-36

386-1457-00

1

PANEL,

rear

oe

ee

-

mounting

hardware:

(not

included

w/panel)

-37

213-0192-00

4

SCREW,

6-32

x

1/2

inch,

Fil

HS

-38

129-0006-00

1

POST,

connecting,

insulated

wwe

eee

-

mounting

hardware:

(not

included

w/post)

-39

210-0006~00

1

LOCKWASHER,

internal,

#6

“40

210+0407-00

1

NUT,

hex.,

6-32

x

1/4

inch

-41

337-1036-00

1

SHIELD,

switch,

fiber

board

-42

260-0675=00

1

SWITCH,

slide--LINE

VOLTAGE

SELECTOR

-seeer

-

mounting

hardware:

(not

included

w/switch)

-43

210-0406-00

2

NUT,

hex.,

4-40

x

3/16

inch

“44

211-0097-00

2

SCREW,

4-40

x

5/16

inch,

PHS

~45

200-0669-00

1

COVER,

transistor

“46

sss

e

8

1

TRANSISTOR

meee

eee

-

mounting

hardware:

(not

included

w/transistor)

-47

386+0143-00

1

PLATE,

insulator

-48

211-0510-00

1

SCREW,

6-32

x

3/8

inch,

PHS

-49

211-0511-00

1

SCREW,

6-32

x

1/2

inch,

PHS

=50

210-0811-00

2

WASHER,

fiber,

#6

-51

210-0202-00

1

LUG,

solder,

#6

-52

210-0457-00

2

NUT,

keps,

6-32

x

5/16

inch

#53

200-0669-00

1

COVER,

transistor

“54

22

we

ee

1

TRANS

IS

TOR

ao

2s

=

mounting

hardware:

(not

included

w/transistor)

Mechanical

Parts

List—Type

285

FIG.

1

EXPLODED

VIEW

(CONT)

Fig.

&

Q

Index

Tektronix

Serial/Model

No.

t

Description

No.

Part

No.

Eff

Dise

Yy

12345

1-

211-0510-00

1

SCREW,

6-32

x

3/8

inch,

PHS

-55

211-0511-00

1

SCREW,

6-32

x

1/2

inch,

PHS

-56

210-0202-00

1

LUG,

solder,

#6

“57

210-0457-00

2

NUT,

keps,

6-32

x

5/16

inch

“58

358-0091-00

1

BUSHING,

strain

relief

~59

161-0052-00

1

CORD,

power,

3

conductor,

8

feet

long

ccc

e

se

-

cord

includes:

-60

334-1205-00

1

SLEEVE,

marker,

cable

“61

179-0318-00

1

CABLE

HARNESS

“ef

22

- -

cable

harness

includes:

-62

131-0512-00

13

CONNECTOR,

cable

-63

=

=179+1317-00

1

CABLE

HARNESS,

power

-64

670=-1010=00

1

ASSEMBLY

circuit

board--+15

V

REGULATOR

eect

eee

-

assembly

includes:

388-1086-00

1

BOARD,

circuit

eer

ere

ee

-

board

includes:

-65

136-0263-01

7

SOCKET,

connector

~66

136-0220-00

1

SOCKET,

transistor,

3

-67

136=-0235-00

1

SOCKET,

transistor,

6

-68

670-1009-00

1

ASSEMBLY,

circuit

board--12.5

V

REGULATOR

wer

eee

-

assembly

includes:

388-1085-00

1

BOARD,

circuit

-69

136-0220-00

1

SOCKET,

transistor,

3

-70

136-0235-00

1

SOCKET,

transistor,

6

-71

131-0590-00

7

PIN,

circuit

board

terminal

-72

131-0608-00

4

PIN,

circuit

board

terminal

-73

351-0155-00

11

GUIDE,

terminal

lead

mec

e

ee

-

mounting

hardware:

(not

included

w/assembly)

~74

211-0152-00

2

SCREW,

4-40

x

5/8

inch,

PHS

“75

361-0212-00

2

SPACER,

sleeve,

plastic

-76

390-0055-00

1

CABINET,

wraparound

-77

348-0138-00

4

FOOT,

rubber

eer

ec

eee

-

mounting

hardware

for

each:

(not

included

w/foot)

-78

210-0006-00

4

LOCKWASHER,

internal,

#6

-79

211-0503-00

4

SCREW,

6-32

x

3/16

inch,

PHS

-80

386-1458-00

1

PANEL,

cabinet,

rear

-81

348-0172-00

2

FOOT,

cabinet,

blue

evar

etree

-

mounting

hardware

for

each:

(not

included

w/foot)

-82

211-0514-00

2

SCREW,

6-32

x

3/4

inch,

PHS

STANDARD

ACCESSORIES

-83

103-0013-00

1

ADAPTER,

power

cord,

3

to

2

wire

-84

012-0127-00

1

CABLE

ASSEMBLY,

RF,

18.5

inches

long

---

070-0903-00

2

MANUAL,

instruction

(not

shown)

7-3

NOTES

wv

||

bon

°

~“powes)

\,

WSV

Ac

TYPE

2a5

POWER

RIO

B20

T2

|

ys

A

&

tL

c2o0

-—|

{60,yF

R22

Cc

806

a)

>

®

i

o

peo”

C22

9V

-T

1S

pF

Q35

-12.2V

—@

|

=12.2V

R37

|

lok

R365

D37

R38

+15V

-12.2V

=

|

(K

$

MK

t

5 i A

+1SV

REGULATOR

BOARD

|

3

.

Is

|

HSV

1230V

a

'Ssw2

F2

+15V

-12.2V

=

:

_

Re

t

’

ied

a

8

A

B3

i

thes

-

160

pF

‘\

©

+15V

+15

z

°

Kt

R12

D

1.8K

RG

lak

Ay

Q/12

{(-

bd

Q/6

REGULATOR

BOARD

-\2.2vV

SAMPLING

HEAD

POWER

SUPPLY

2.43K

2RI4

S$

7.5K

P

.

Ri

a

196K

+

-

C18

e

A

—12,2N

_|

|

TRIG

J

40

—

IN

J17

aa

TRIGGER

OUT

t

J45

1o68

FIG.

1

EXPLODED

Ee

MECHANICAL

PARTS

LIST—TYPE

285

Tektronix 285 User manual

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