HP 204B Service manual

OPERATING

AND

SERVICE

MANUAL

MODEL

SERIALS

PREFIXED:

2048

OSCILLATOR

416-

01369-4

Printed:

JUHE

1964

Mode1204B

Index

SECTION

SECTION

SECTION

I

GENERAL

II

INFORMATION

INSTALLATION

III

OPERATION

01369-1

SECTION

SECTION

SECTION

IV

PRINCIPLES

V

MAINTENANCE

VI REPLACEABLE

OF

OPERATION

PARTS

Iii

Model 204B

TAau

0'

CONTENTS

TableofContents

ListofIllustrations

ListofTables

Section

I GENERAL INFORMATION.

1'-1.

1-4.

1-6.

1-8.

1-10.

INSTALLATION

U

2-1.

2-4.
2-6.
2-8.
2-10.
2-12.
2-16.

OPERATION.

10

3-1.
3-3.
3-5.
3-10.

3-16.
3-20.
3-26.

PRINCIPLES

'V

4-1.
4-7.
4-13.

Introduction
Power

Mercury
Accessories
Instrument

Inspection

Rack/Bench

Combining
Adapter

Battery-Powered
AC-Powered

Repackaging

Introduction

Procedure.

General

Operation

Batteries

Recharging

Batteries.

Cycle-LifeofNickel-Cadmium

Batteries.

Mercury

Introduction

Oscillator

Peak

Detector

. . .

Supply

and

Rechargeable

Available

Identification

.

Instructions

Frame.

Oscillators

lor

.

Operating

With

Battery

OF

OPERATION.
Circuit

Case.

Oscillators

Shipment.

Rechargeable
Nickel-Cadmiwn

. .
. . .

Replacement.

Batteries

Considerations

Page

'-1
'-1

• -1

.

1-'
1-'
'-1

2-1
2-1
2-'
2_'

2-'
2-'
2-1
2-2

3-1
3-1

3

_1

3-1
3-.
3-2
3-2

3

-2

4-'
4-'
4-'

4-2

SecUon V (Cont'd)

Performance

5-5.
5-7.

~-8

5-9.
5-10.
5_12.
5-14.
5-16.
5-18.

5-19.
5-23.

5-26,
5-28.
5-29.

5-3l.
5-32.
5-34.

5-36.
5-38.

5-40.
5-42.

5-45.

Dial

Frequency

.

Output

Distortion

Repair

Cover

Servicing
Troubleshooting.
Adjustment

AC
Battery

Adjustment
DC
Distortlon
Frequency

Adjustments

Replacement

Cam
Frequency

Replacement.

Range Switch

Replacement
Battery-Pack
AC

Power

Rechargeable

Supply .
ReplacementofRechargeable

Batteries

Accuracy

Voltage

.

Removal

EtchedCircuit

and

Power

Charger

B:41.

Adjustment

Cable

Supply

.•

Checks.

Check

Response

Check

CaUbration

Supply

.

Check

Calibration
Procedures.

Replacement

Potentiometer

Assembly
Power
Battery

. • .

and

Check.

.

Checks.

Current

.

..•

Supply.

Power

..

Boards.

•
..
. .

..

Page

5-1
5-1

5-2
5-2
5-3
5-3
5-3
5-4
5-4

5-4
5·4

5-5
5-5

5-5
5-6
5-6

5-6
5-7

5-6
5-8

5-8

.

5·8

MAINTENANCE

V

5-1.
5-3.

Number
1-1.

3-1.
3-2.
4-1.

4-2.
4-3.

Number
1-1.
5·1.
5-2.

2-1.
2-2.

2-3.
2-4.

5-1.
5-2.

Speciflcations
Required
Dial

Model 204B
Combining
StepstoPlace

Combining

Adapter

TwoSubmodule

Front

and

Rear

Mercury
Block
Simplified

RC

Test

Distortion
Test

and

Introduction
Required

Panel

Operating

View of Model 204B Showing

Diagram

Network

Setup
Setup

Output

Accuracy

Test

OscUlator

Case

Instrument

Case

Frame

Instrument

UnitsinRack

Controls,

Instructions

Batteries

•..•.•....

Schematic

Characteristics

for

Dial

Checks

for

Frequency

Voltage

.....

Test

Equipment

. . . . ,

Equipment

.

....

Into

. . . . . . . . .

Combinations

Adapter.

Connectors

Installed.
Diagram

Accuracy

...•...

Response

Check.

...

..

...

or

. . . •

LIST

5-1
5-1
5-1

O'

ILLUSTRATIONS

Page

1-0
2-0

2-0
2-1
2-2

3-0

3·2
4-'

4-2
4-2

5-1
5-2

LIST

0'

TAlLIS

Page

.-.

.

5-1

.

5-2

VI

REPLACEABLE
6-1,
6-2.

Number

5-3.

Cover

5-4.

Model 204B, Exploded View . 5-4

5-5.

Cams

5-6.

Range

5-

'7.

Rear

5-8.
5-9.

5·10.

5-11.

5-12.

Number
5-3.
6-1.
6-2,

Model 204B
AC
Rear

Battery

Oscillator

Pack

Option 02

Rechargeable

Option01AC

Troubleshooting
Index by
Replaceable

PARTS
Introduction
Ordering

Removal.

and

Switch

ViewofBattery-Powered

Power

Internal

Power

Information

Cable

Detail.

.......•..

Supply

ViewofRechargeable

Power

and

AmpUfler

Supply

Power

Batteries

Power

Reference

Parts

..

. . . .

..

.. . .

Relationship.

....

Installation.

Supply

Summary

.••..

Supply

Supply.

Designator

.....

...•....

with

with

..

Battery

,

6-'
6-'

6-'

Page

5-3
5-6

5·7
5-8

5-8

· 5-10

· 5-11

· 5-12

· 5-13

Page

5

-5

6-2
6-5

v

Model204B

SECTION I

Paragraphs

Section I

1-1to1-11

1-1.

INTRODUCTION.

1-2.

The

Model 204B

transistorized

battery-powered

duces sine_wave

The

outputis10milliwatts
tinuously'
the
within
from

1-3.

adjustable

rated

load of 600

±3%,

The

power

line ground and

The800-ohm

signalsinthe

oscillator

Oscillator

overatleast

ohms,

output
makesitcompatible with
distribution
oscillatorisuseful for
Model403A/B
makes

systems.

isolated

AC

Voltmeter.

an ideal companion

204B.

1·4,

POWER

1-5.

Normally

tery

pack

batteries.

which

If

SUPPLY.

the

oscillator

consists

operation

from
power supply (Option1)or
chargeable
of

these

areinkit

and
packisalso

suppl1es mount

and can be

1-6.

1-7.
ventedtoprevent

batteries

power

supplies

form

in kit

in

easily

MERCURY
BATTERIES.

Mercury

batteries

(Option2)may

operate

for field

form.

the

same

interchangedinthe

AND

excessive

GENERAL

(f1gure

instrument

5-cps

to

560_kc

into 600

outputisfloating,

instrument

impedanceofthe
transmission
When

instrument

of four 6. 75-volt

a power supply with

AU

location

RECHARGEABLE

usedinthe

internal

ohms

a 40-db

frequency

lines

battery-powered,

applications.

also

battery-powered,

for

is equipped with a

AC

is

desired,

be

from

115or230 volts,

installation.

three

types

inthe

field.

Battery

pressures

1-1)

which

range.

andiscon-

range.

response

isolated

chassis.

oscillator

and many

The ~

the

Model

mercury

an

used. Both

Thebattery

of power

instrument

Pack

INFORMATION

developing.

ed

but

presentnoproblemifproperly

is

a

pro-

Into

is

the

bat-

AC

re-

are

from

III). The

either

type of

a.

DO

b.

Disposeofbatteries
exhausted

specifications.

c.

Never

d.

Turn
in

e.

Store

1-8.

OPTIONS

1-9.

The

ableinkit

Battery
AC

Operated

Rechargeable

1·10.

1-11.

Hewlett-Packard

digit

serial
digitsofthe
agree
change
differences
204B

describedinthis

The

nickel cadmium

follOWing

battery:

NOT

short

or

disposeofbatteries

off

battery

use.

batteriesina cool

following
form

for

Pack

Power

Power

Battery

INSTRUMENT

number

serial

with

those

sheets

supplied with

between your

batteries

used

(see

precautions

circuit

shouldbefollowedior

either

type of

battery.

promptly when

will not

operate

by

equipment up

fire.

powered equipment when not

well-ventilated

AVAILABLE.

three

power suppUes

field

installation:

Supply - 204B-64B

Supply -

Power

IDENTIFICATION,

204B-llA

Supply.

204B-llC

usedatwo·section,

(000-00000).
numberonyour
on

the

title

instrument

If

the

first

instrument

pageofthis

the

manual will define

and

manual.

are

they

are

manual,

the

seal-

Section

have

to

place.

avail-

eight-

three

do not

Model

FREQUENCY RANGE: 5 cps

vernier

DIAL ACCURACY:

control

±3%

FREQUENCY RESPONSE:
OUTPUT IMPEDANCE: 600
OUTPUT:

5

vrms

10

milliwatts

open

clrcuit,

(2. 5

completely floating

OUTPUT CONTROL: Continuously

"TOO

attenuator

with at

least

01369-4

to

±3%.

ohms

vrms)

40-db

Table

560 kc in 5

with

rated

into

600

variable

range

I-I.

ranges.

load

ohms,

bridged

Specifications

DISTORTION:
NOISE:

Less

POWER SOURCE: 4

7-ma

drain,

DIMENSIONS: Module

wide,

8

NET WEIGHT:

EQUIPMENT

Kit for field
able

Battery

2048-64B.

Less

than

1%

than

Ufe at

in.

deep

6 lb

AV

installation,

0.05%.acor
batteries

least

6-3/32

AlLABL'E:

Supply Kit

battery

at

8.75

300

hours.

In. high,

204B-llA.

204B-llC

for

field

Battery Kit for field installation.

operated

volts each,

5-1/8

in.

AC

Supply

Recharge-

installation,

1-1

Model204B

2-1.

INSPECTION.

SECTION II

INSTALLATION

Paragraphs

Section

2-1to2-14

II

2-2.

Unpack the

it

for

signsofphysical

surfaces,
proceed
Shipment"
manual.

2-3.

as

soonaspossible
for
dures

2-4.

2-5.

a

tilt

instrument.

ing,

following the

2-6.

2-7.
full-module
of submodule units
full-module
a bench model
for
figure
a

1/3-module

either
the

2-8. ADAPTER FRAME.

broken

as

sectionofthe

An

electrical

performance

for

incoming qual1ty-control

RACK/BENCH

The

Mode1204B1sshipped with

stand

remove

COMBIN1NG
The

useofthe

2-Z

the

divider

instrument

knobs.

described

after

checks.

attached.

To

adapt

the

plastic

procedure

CASE.

combining

unit which

suchasthe

unit,

the

oritcanberack

combining

for

liZ-module

Wlit.

thereforeitis

right

or

left

assembly.

inspection shouldbeperformed

ready

the

case

combining

upon

receipt

damage

etc.Ifdamageisapparent,

in

the

warrantyinthe

receipt;

These

INSTRUCTIONS.

Model204Bfor

feet identifiedin figure 5-3 by

given in

accepts

case

units.

divider

suchasscratched

"Claim

see

are

inspection.

for

useasa

paragraph

showninfigure

varying

Model 204B. Being a

case

mounted.

are

given graphicaUy in

The

latch

and

for

Damage in

rearofthis

paragraph

good

test

plastic

bench-type

rack

combinations

canbeused

Instructions

Model 204B

necessary

when

inspect

proce-

feet

mount-

5-13

2-1isa

to

installing

5-5

and

(c).

as

use

2-10.

2-11.
plied
There
placing
To
a
graph

2-12.

2-13. POWER REQUIREMENTS, When
2048
battery
::1:10%.50to
sourceis115
rear
230-volt
number

2-14. POWER CABLE.
ting
Association
panel
fromanac
supply
equipped with a

cable

tacle,

is

power

BATTERY-POWERED

Power

from

are

convert

rechargeable

5-35.

has

panel,

personnel,

and

which, when plugged

grounds
cable

for

four6.

no

special

battery-powered

for

operation

battery

AC-POWERED

anacpower supplyorthe

power

230

or

supply. a

IWO

volts.

so

that the

sourceisused,

appears.

the

(NEMA)

cabinet

power
rechargeable

the

three-prong

FILLER

i \

OSCILLATORS.

battery~poweredoscillators

7:i-volt

be

line.

detachable.

Mallory

installation

oscillators

fromanac

power

OSCILLATORS.

sourceof115or230

cps

wtIl

set

the

number

place

For

National

recommends

groWlded when being

Instruments

battery

intoanappropriate

instrument.

connectoristhe ground pin.

PANEL

mercury

instructions
power supply

supply.

be

required.

switch.

115

appears.

the switchsothat

the

protectionofopera-

Electrical

three-conductor

Manufacturers'

that

with

power supply

The

offset pin on

into

refertopara-

located on

the

is

sup-

batterles.

for

operation.

the

Model

rechargeable

volts

When the

the

If

the

instrument

operated

the

acpower

are

power

recep-

the

or

a

I

,

I (0

2-9.

The

adapter
accepts
ure
areasfollows:

01369-3

any combinationofsubmodule

2-3);itcan only

a.

Place

adapter

as

shown in

b.

Stacksubmoduleunitsinframeasshown in

2 .

Place

c.

Place

two end

4 • and push submodule

d.

Insert
and tighten
frame.

e.

The

complete

mounting.

frameissimplyarack

be

rack

frame

vertically

step

1 •

spacer

screwsoneither

until

clamp

spacer

8ubmodule Wlits

assemblyIsnow

mounted.

flgure

between

clampsasshown in

units

sideofframe,

frame

that

units

(see

fig-

Instructions

on edge of bench
2-4.

step

units,

step

step

into

frame.

step

5

are

tight

ready

for

rack

3

in

0

0

10
10

10

I

Figure

2-3. Adapter

Combinations

Frame

~.!_,_u

Instrument

I (

I (

I (

Ie

0

I

2-1

Section
Paragraphs

2-15.

ating
three-prong
pigtailOnthe

2-16.

II

To

preserve

the

instrument

REPACKING

2-15to2-17

the

protection

fromatwo-contact

to

two-prong

adaptertogrOWld.

FOR

feature

adapter

SHIPMENT.

and

when

outlet.

cannect

oper-

use

the

Model 2045

a

CD

ADAPTER

FRAME

2-17.
aginganinstrument
questions.
facility.

able.Iforlglnai

purchased

and

ment in heavy
inner

instrument
metal

The

a.

Service

b.

container.

c.

bandstoseal

d.

ment",

If

Packard
to
number,

service

correspondence

model

serial

followingIsa

contact

Proceedasfollows:

Place

instrument

containerisnot

from

your

Office

If

original

paper

Usea

heavy

and

inner

Mark

shipping

"Fragile",

instrumentisto be

{or

Instrument

serial

or

repair

number

number

general

for

shipment.

your

local19sales

lnoriginal

nearest

(refertomaps

containerisnot

or

plasUc

cartonorwooden box to

container

the

shipping

container

etc.asappropriate.

Note

shippedtoHewlett-

serviceorrepair,

Identifying

number,

to be

identify

and

prefix.

serial

guide

If

officeorrepair

containerUavai-

available,itcan

Hewlett-Packard

in Appendix).
used.

before

and

use

container.

with

"Delicate

atracha

owner,model

and

performed.

indicating

instrument

number,and

for

you

.....

rap

strong

In any

repack-

have

Sales

instru-

placing

house

tape

Instru-

tag

by

any

be

in

the

or

=---

~.

~-~

@ SPACER CLAMP

RETAINING SCREWS

Figure

2

-4.

in

Two

Rack

o

Submodule

Adapter

o

...----@

liZ

MOOULE

INSTRUMENT

Units

4

2-2

01369-3

Section

Figure

IJ]

3-1

Model 2048

Controls and COlUlectors

1.

For

selecting

frequency

osclllatorisinoperative.

On

indicator;

2.
switch except

3.

For

selecting
Dial
position

calibration

OFF.

gives

second.

4.

5.

6. Output

7.

3

-0

Provides
calibrated

For
imum

~

is

fine frequency

with

selecting

desired

into 600 ohms).

terminals,

cabinet

groW1d

range.

glows in

all

frequency within

multiplied

InOFF

positions of RANGE

desired

by

RANGE

output frequency in

adjustment.

arrow

in verUcal position.
output level

(10

floating; impedance, 600 O.

terminal.

Figure

3-1.

Front

position

range.

switch

cycles

Dial

mw

max-

Panel

Operaling

per

is

Operation

a.

Connect loadtoOUTPUT

b.

Select
(3). Example:
RANGE to XIK.
quency1s20kc(20

c. Set AMPLITUDE

If

oscUlatoriseqtdpped with

ply
turning
AC

D1sconnect power
two

Controls,

Connectors,

Instructions

frequency with

or

Rechargeable

RANGE

Power

power

Supply

supplies

RANGE

If

FREQ.

the

oscillator's

cpsxlK=20

(5)

for

desired

Note

Battery

switchtoOFF

or

Battery

cordtolurn

off.

and

600Q(6)terminals.

(1)

and FREQ.

is

set

to

20

and

output

fre-

kc).

power level.

AC

Power

Power

does not

Charger

Sup-

Supply,

turn

off.

eitherofthese

Model 2048

paragraphs

SectionIII

3-1 to

3-15

3·1.

INTRODUCTION.

3-2. The Model 204B has four

one output

signal in the

connector

5-cps

positioning the FREQ

trols.

AMPLITUDE

Output power level

control

(see

to 560-kc rangeisselected

.•

which has
A 115/230 volt switchison the
llalors
chargeable

3-3.

3-4.
given in figure

3-S.

3-6, To
lator, a blocking

are

equipped withanac

battery

PROCEDURE.

Operating

power supply.

instructions

3-1.

GENERAL
CONSIDERATlON

prevent

OPERATING

damage to
capacitor

operating

figure

3-1). A sinewave

RANGE, and VERNIER con-

is

controlled

atleast

rear

panel

power supplyorre-

for

the

Model 204B

S.

transistors

should be
with the output when connecting to a load
thereisa dc potential
Is used, Initial
capacitance-voltageproduct
volts.
exists

For

example, if a 20-voH potential

across

thp.

20v=200j..l.fv).

DO

NOT
ACROSS
OFF

LOADS

GROUND(.....)BY

current

load,

difference.

surge

usea10-j..I.f

When the

mustbelimited

less

than 200

capacitor

CAUTION

CONNECT THE OSCILLATOR

WHICH

ARE

REFERENCED

MORE
VOLTS;H1GHERVOLTAGESWILL BREAK
DOWN

3-7, When the Model 2048 is
RANGE
cillatortostabilize;
for

stabilization
sltions.1f FREQ. dialissweptattoo
put voltage fluctuations will

resistorisusedasthe
element).Ifsweep
stopped,

COMPONENT INSULATION.

switchissettoXl,

allow20seconds

only a few

when SWitching to

occur

variable

speedisdecreasedorsweeping

oscillator

output

will

initially

seconds

other

fastarate,

(Since a wlrewound

frequency

stabilizeatits

leveL
3-8, To obtain maximum amplitude

battery-powered
turn-on
effect may
during the

3-9. When

lopermit

causeasmuchasa1%change in amplitude
first20minutes

operating

Nickel-Cadmium) the

recharging (Nickel-Cadmium

maximum

rmS open

ohms.

to

paragraph

cadmium

3·10.

3-11.
for an

oscillator

circuitorless

For

batteries

OPERATION

BATTERIES.

ThereIsno

instrument

the

mercury

3-26,

osCillators,

battery

of operation.

from

batteries

output

becomes

than

battery

Charging

are

given in

WITH

change in the

in which the

wait20minutes

voltagetostabilize.

batteries

require

batteries

less

2.5

volts

replacement

Instructions

paragraph

RECHARGEABLE

operating

rechargeable

SECTION

OPERATION

controls

by the

a 40-db

usedinseries

THAN

turnedonand

are

stability

(Mercury

replacement

than 5. 0 volts

range.

whenoscl-

in the

oscil·

across

which

capacitor

microfarad-

difference

(lOj..l.f

±25

for

necessary

RANGE

determining

normal

from
after

This

only) when

rms

into 600

data,

refer

for

nickel~

3~16,

procedure

battery

and

by

are

to a

os-
po-

out-

or
or

III

supply has been

installed.
plypermitseitheracoperatiOnfor
(selected
sourcesorbattery

Battery

by switch

operation

operation

only (with
c08nected)isrequired
(0

£l

andisrecommended

104 F (400C),
3-12.

Is
ment and a

When the

removed

RANGE

from the

resistorisconnected
the power supply. The
operate
power

as

long

source,

as

The
put of the power supply,
oscillator
through the
prevents

connected
3-13,Itis

nected to a power

will

x

assure

operationisreqUired.
not
cord

3-14.

the

section

to maintain a constant

batteries.

battery

discharge

toapower

recommended that the

source

preventseIf-discharge

a fully

In

use, partiCUlarly when operating with the power

charged

disconnected.

When fully charged, the

oscillator

for apprOXimately
uousorintermltteJlt opesation provided they
temperatureof81

F ±10 .Ifthe
atedathigherorlower
is

reducedasthe

temperature
ed; approximatelY2B
imately
beyond
of supplying

20

hoursat-4 F

these

extremes

their

characteristic

voltage.

is

3-15.
adequate
in mind when
nal
obtainedifthe
a
be to avoid
direct
avoid placing the
surrounding
internal

The +1220Fto_4

for

temperatures

moderate

ambient

storing,

sunlight

temperature.

most

users,

operating

in

instrumentisleft in the sun, even with

temperature.

other

thanfor a

instrument

equipment might

THE HERMETICALLY SEALED CELLS
THESE BATTERIES
DAMAGED
REDUCED

OR

IF

EXPOSED

THEIR

TEMPERATURES, THIS DANGER INCREASES
UNDER PROLONGED CONDITIONS.

However, this power

115/230 vac

on

rear)

50

to 1000 cps power

for

portable

charger

at

temperatures

at

temperatures

switchisturned

oscillator

portion

across

charger

the

power

reSistor,

cordisconnectedtoa

placed

actsasa loadInplace

A diode in the output

when the

source,

power

whenever pOSSible,

of the

battery

Turn

battery

the

oscillator

whenever

batteries

40

batteries

temperatures

extrIemes

h0:-ors

at

12J F (50

(-20

C).

At

the

batteries

stable

0

F

temperature

however, keep

under

field cOJlditiOns.

excess

of 122 F

Good

transporting,

very

short

in a location where

excessively

CAUTION

MAY

BE PERl\1ANENTLY

LIFE

TO

DRASTICALLY

EXTREMELY

sup~

±-10%

applications,

power

cord

diJi'-

below 32 F

above

OFF, power

of the

instru-

the output of

wlll continueto

across

the

out~

of the

charge

rate

circuit

oscillatorisnot

cord

be con-

This

cells

and will

portable

OFF

when

wilt

hours

power

of

contin~

areata

are

operp

their

capacity

are

approach-

0

C)orapprox-

temperatures

are

not capable

discharge

range

these

limits

Inter~

are

easily

practice

or

operating

period.

raise

would

Also

the

IN

HIGH

is

in

01369-4

3-1

Section III

Paragraphs

3-16

to 3-27

3-16. RECHARGING NICKEL-CADMIUM

BATTERIES.

3-17.
discharged
below 5. 0 volts

rms

much longer when

llator

sive

shorten

3-18.

connect power

batteries

hoursata

hoursata11milliampere

fully

be

20

charged,

time.

The

The

into

6000hms.

probably wHl not

discharge

their

To

recharge

will

discharged
turnedonfor
minutes.

the

The
llatorisOFF
CN!ase in

charging

mentisused

charge

current

adjustment
maximum of
charge.
used
high

3-19.
ture
ever,

Sho~ld

The

for

quick

rate

will

The

between

to obtain
be

ione

(27C:1:5.6

batteries

should be

when maximum

rms

open

circuitorless

The

batteries

this

point Is

meet

of

batteries

lile.

batteries,turnoscillatorOFF

cord

to a

be

fully

chargedinapproximately

5.5

milliampeN!

at the beginning.
use

alteraninitial

If

the

batteries

oscillator

charge

or

while the

circuit

canbeturnedonfor

rateisthe

operating;

time

will be

batteries

can

be

RI02

11

milliamperes

11

milliampere

charge

shorten

batterJes

+32

only. Repeated

battery

can

F to

+122

opthnum

atatemperature

C).

considered

oscillator

than2.5 volts

will not

reached

and

specifications.

may damage them

suitable

cllarge

power

charge

current
currentifthey
The

instrument

chargeofat

were

only

same

whether

therefore,

very

requiredifthe

are

being

increased

(refer

charge

to

to

with the

figure

provide

rate

life.

beochar&ed

at

an~

F (0 C to +50 C). How-

battery

life, techargl&g

of

80.6

CAUTION
THE FOUR NICKEL-CADMIUM BATTERIES
ARE

HERMETICALLY SEALED
DAMAGED
AT
(500C).
MENT

IF

CHARGED

A TEMPERATURE EXCEEDING 122 F

IF

THE CHARGE CURRENT ADJUST-

HAS

BEEN SET FOR A QUICK CHARGE

AT

AND

A FAST

RATE, PLACE THE INSTRUMENT

LOCATION WHERE THE

TE~PERATURE

(40 C),

3-20.

CYCLE-LIFE

DOES

OF

NOT EXCEED 104 F

NICKEL-CADMIUM

AMBIE~T

BATTERIES.

3-21. As
the

cycle-Hfe

the

batteries
h:.res
decrease

may
perature

3-22.
ing
charging
than the maximum
manufacturer,

3-23. The
the
225
hour

extremesIntemperatures

(complete

Is reduced.

wHi

Increase

the

resultifthe

for

the

cycle-lUe.

batteries

a prolonged

Batterycycle-Hfe

before

the

and

discharging

batteries

and

by not

cycle-ltfe

manufacturerer,on

milliampere-hour

charge

and

discharge

charge-discharge

Storageathigh

self-discharge

Permanent

are

storedata high

period.
canbe

extended by

are

completely

at a

ten·hour

rate

rate

overcharging.

of

the

batteries

an

endpoint of

capacity.

currentof22.5

are

rate

battery

whichisslower

specified

80%

Thisiswith a

as

fully

output

drops

operate

the

osci-

Exces-

or

and

source.

The

60

and

30

were

can

least

partially

dis-

useatany

the

osci-

little

In-

instru-

recharged

charge

5-11) to a

a quick

should

chargingata

tempera-

F

:1:10

CAN

BE

RA!E

IN

A

approached,

cycles)

tempera-

and

also

damage

tern-

recharg-

discharged,

by the

is

based,

ofthe

rated

ten-

milliam-

be

F

of

by

peres

..vlth

discharge
end voltage
on

every

in

excess
3-24. When
tor,

the

40

hour

if

they

cycle.

of 100

batteries

rate.

are

recharged

(t.

used

10

The

3-16.
3-25.

lowing a
battery
output
cuit
a quick
erate
connecting
charging
charging

3-26.

3-27.
oscillator

circuitortess

vided the

batteries
(Mallory
3-2,

(2.5Vrms

a.

cover

Optimum

simple

dischargebyrecharging

level

drops

into 600 ohms),2)keeping the

charge

to a minimum,3)0?erati.1Jatmod-

temperatures

power

with

oscillator

batteriesata quick

MERCURY

Battery

output

than2.5

DC

BALisadjusted

with

type TR235Rorequivalent).

and

proceedasfollows:

Remove top

from

instrument.
b. Remove wing nuts
c.

Remove and

paragraph

d.

polarity

1-6.

Install

matches

replacement

clamps.

e.

Replace

£.

Replace top

D!SIGNATION

Figure

battery

'OLA"ITV

3-2.

Mercury

carried

volts/cet!

Under

cycles

canbeexpected.
topowerthe
are

dischargedatapproximately

batteries

as

battery

to the

x 5'"5.50

these

conditions a

$I;

Model

are

not fully

recommended

life

can

normal

be

routine of1)preventing

before

below

5.0Vrrns

whenever

cord

after

BATTERY

replacement
becomes

less

volts

turned

charge

rms

intoanopen

possible

60

hours

OFF

rate).

REPLACEMENT.

is

reqUIred

than

5.0

into 600

correctly.

four

6.75-volt

cover

retaining

and

mercury

battery

disposeofbatteries

batteries

polarity

clamps

designation

and wing

cover.

8ATTE"Y

ClJ;M?

Rear

View of Model 204B Showing

Batteries

Installed.

Model204B

ten-hour

volts!battery)

cycle-life

204BOscHla-

discharged

in pa.ragraph

obtained by fol-

complete

the

oscillator

cir-

use

and4)by

dis-

of continuous

(30

hours

whEen

the

volts

rms

open

ohms

pro-

Replace the

batteries

Refer

to figure

screw

and

slide

clamps.

according

so

that

battery

on

battery

nuts.

WING

'"

a

of

if

to

3-2

01369-2

Model204B

SECTION IV

Paragraphs

Section

4-1to4-10

IV

4·1.

INTRODUCTION.

4-2.

The

Model204B

lator

circuit,apeak
attenuator
front

in

the

4-3.
bridge,atwo-stageampl1fier,
ers.
whichis1)
and2)appliedtothe

4-4.
selective
work.
positive

frequencyofoscillation.

er

networksupplies
The
difference

4-5.
bridge
sion

thereby

The

the

RC

(bridged-T

panel

controls

block

diagram,

The

He

The

output of

returned

The

RC

network

The

RC

feedbacktothe

output of

between

The

peak

oscillator

ratio

of

changing

peak

detector

oscillator

bridge

the

the

consists

detector

type).

associated

figure

bridge

frequency-selective

detector

oscillator

this

circuitisa

to

the

output

consists

andaresistive

amplifier

The

negative

amplifier

the

feedback

output

voltage

resistive

the

amountofnegative

with

the

outputata

PRINCIPLES OF

of an RC

circuit.

These

with

4-1.

consists

and two

RC

bridgeasfeedback,

attenuator.

of

an

voltage

and

resistive

feedbacktothe

is

proportional

signals.

detects

voltage

divider

changesinthe

and

network

constant

bridge
andanoutput

circuits

them

are

emitter

sine-wave

He

frequency-

divider

network

determines

voltagedivid-

amplifier.

changes

divider

level.

oscil-

and

the

shown

of an

HC

follow-

signal

net-

supplies

the

to

the

RC

the

divi-

network,

feedback,

maintains

OPERATION

4-6.

The

attenuatorisa

provides

voltage

4-7.

4-8.

of

anHefrequency-selective

voltage

networkissimilartoone

resistive

4-9.
age
to

maintain
shipatthe
componentsinthe

4-10.
series

and
which X = R in

posltive~eedback

and1sin
tage

Rw1llbeamplified;atfrequencies
equalR,the
right
oscillation.
curve

and

continuous

while

OSCILLATOR

The

RCbridge1nthe

divider

voltage

As

in any

(from

the

oscillations.

desired

The

frequency-selective

branch,

H2,

as

shown in

phase

(figure

phase

below

4-3).

andisinsufficientinamplitudetosustain

Figure

and

phase

the

maintaining

network.

divider,

oscillator,

oscUlator

bridge.

CI and

the

voltagetothe

with

Only

positive

relationship

frequency

bridged-T

controlofthe

constant

CIRCUIT.

oscillator

network

The

frequency-selective

legofa Wien

the

other

an

in-phase

circuit

frequencyismaintained

RI,

figure

series

the

oscillator

that

feedback

4-3

shows

where

output)isnecessary

The

proper

network

andaparallel

4-2.

For

and

parallel
amplifierismaximum

frequencyatwhich X =

voltage

the

for

Xc =

attenuator
oscillator

output

circuit

whereXdoes

frequencies

circuit

and a

bridge;

leg.

feedback

phase

consists

the

frequency

branches,

is

positive

R.

impedance.

consists

resistive

relation-
bytheRC

branch,

output

bot

feedback

which

output

the

volt-

of a

C2

at

the

vol-

Rot

of

the

above

RC

BRIDGE

(RIQA,B,C2,c11

IVE

Q

,

,

,

k

,

,

Ci

RNIERI

, ,

"'>1

, ,

"

'

,

,

0

I

RANGEl

POSITIIIE

FEEDBACK

NEGATIVE

FEEDBACK

AMPLIFIERS

Figure

FEEDBACK

QI

,02

4-1.

Block

FOLLOWERS

Diagram

EMITTER

03,04

PEAK

DETECTOR

05

,CR6

~O.I-~·'.

!AMPLITUDE

ATTENUATOR

R40A.B If,

Q,

I

,

,

!OUTPUT I

h-<

,

,

,
,

,

r-'--<

•

01369-2

4·1

M.odel

204B

Paragraphs

Section IV

4-1to4-10

4·1.

attenuator
Iront
in the block

4-3.
bridge.atwo-stageamplil1er,
ers.
whichis1)
and

4-4.
selective

work.

positive
frequencyofoscillation.
er
The
difference

thereby

The

the

INTRODUCTION,

4-2.

The

Mode1204Bconsistsofan

lator

circuit.apeak

(bridged-T

panel

The

Re

The

output of

2)

appliedtothe

The

RC

networkandaresistive

The

feedbacktothe

networksupplies

output of

between

4-5,

The

peak
bridge
sion

oscillator

ratio

peak

Re

oscillator

of

changing

detector

detector

type).
controls
diagram,

returned

bridge

RC

the

associated

figure

bridge

frequency-selective

the

detector

oscillator

this

circuitisa

to

output

consists

amplifier

The

negativefeedback

amplifier

the

feedback

output voltage
resistive

the

amount of

with

the

output at a

the

detects

PRINCIPLES OF

RCbridge

circuit,

These

4-1.

and two

RC

attenuator.

resistive

is

voltage

divider

constant

circuits

with

them

consists

emitter

sine-wave

bridgeasfeedback,

of

an RC

voltage

network

and

determines

tothe

proportional

signals.

changesinthe

and

changes

divider

negative

network

level.

SECTION

oscil-

and

an output

and

the

are

shown

of an RC

follow-

signal

frequency-

divider

voltagedivid-

net-

supplies

the

amplifier.

to

the

He

the

divi-

network,

feedback.

maintains

IV

OPERATION

4-6.

The

attenuatorisa
provides
voltage while

4-7,

4-8.
ofanRe
voltage

network

resistive
4-9.

age

to

maintain
shipatthe
components in

4-10.
series
and R2,
which X
positive
andisin
tage
Rwiilbeamplified;atfrequencies
equal R, the
right
oscUlation.
curve
and

continuous

maintaining

OSCILLATOR

The

RCbridgeinthe

frequency-selective

divider

is

voltage

As in any

(from

the

The

branch,

as

""

<feedback

phase

(figure 4-3), Only

phase

and

below

the

network.

similartoone

divider,

oscillator,

oscillator

oscillations.

desired

the

bridge.

frequency-selective

C1

and

shown in

R in

the

voltagetothe

with

positive

andisinsufficient in

Figure

phase

relationship

frequency

bridged-T

controlofthe

constant output impedance.

CIRCUIT,

osc1llator

network

The

legofa Wien

the

other

an

in-phase

circuit

The

proper

frequencyismaintained

R1, and a

figure4-2.

series

the

4-3

and

parallel

amplifierismaximum

oscillator

that

frequency at which X

feedback voltageisliot of

shows

for

where

Xc

attenuator
oscillator

circuit

and a

frequency-selective

leg.

feedback

output)isnecessary

phase

network

parallel

For

amplitudetosustain

the

consistsofa

the

frequency at

branches.

circuit

where

positive

frequencies

=:

R.

consists

resistive

bridge;

relation-
bytheRC

branch,

output

X docs

feedback

which

output

the

volt-

the

vol-

the

above

C2

::

Rot

RC

BRIDGE

(RI0A,B,e2,C7)

IVE

IfREQI

Q

(j

RNIERI

\

,

,

,

,

,

,

.

,

,

,

,

,

,>1

,

,

,

b

RANGEl

I

POSITIVE

fEEDBACK

NEGATIVE

fEEOBACK

AMPLIFIERS

Figure

FEEOBACK

01,02

4-1.

Block

FOLLOWERS

Diagram

EMITTER

03,04

PEAK

DETECTOR

05

,

00'-11>-1'"

lAMPLITUDEI

ATTENUATOR

,eRG

0,

R40A,B

,

,

m

10UTPUT I

h--<

,
,

,

,

,

.,r-<

01369-2

4-1

Section

Paragraphs

IV

L

r

1
1

1

1
1
1

1

1
1

1

1

1

1

,

'------

4-11to4-15

FREO.

9

,

----

"

RI

VERNIER

Model

2048

FEEDBACK

s-

r-

__

AMPLIFIER

ANO

EMITTER

CI

"

POSITIVE

FEEDBACK

FOLLOWERS

ATTENUATOR

O::U~TPUT

BRIDGED

TEE

s-

AMPLIFIER

NEGATIVE
FEEDBACK

01

"

C2

,

(j

s'

BIAS

VOLTAGE

l041-~·'"

'37

s'

Figure

The

4-11.

of

R3

to

maintain
level. The negative feedback
to

the dynamic
controlled by
the

diodes by
lator
the

change and
diodes, Diode conduction changes(seenasan
ance
amount of negative feedback.

oscillator

the

peak
on

CR4
Increased
the

amountofnegative feedbacktothe

amplifler.

in a

the

output

maintainedata constant14volts
4-12, Two

plifythe
followersQ3and
ward
condition
over
sampledbythe
bridged-T

4-13.

4-14.

resistive

andZIwhich

the

the

ctrcuit

change in

detector

decreaseinthe

distortion.

output changes,

output Signal exceeds -7 volts then, the

andCR5.

Impedance inZIof

Increasing

signal

amplifiers,

signaland apply ittocomplementary

biased

are

attenuator.

PEAK

The

peak

voltage

provide

oscillator
resistance

the

amount of

peak
convertsitto
the

bridge) I and

circuit

by CR2 and
conducting sHghtlytominimize

would

increasing

net input

decreases.

Q4.

The

peak

detector

DETECTOR.

detector

divider

negative feedback voltage

circuit

detector

the

Ql

The

emitter

CR3

oscillator

circuit

outputata constant

is

developed in

of

CR4 and CR5 which

forward

circuit.

the

peak

a new

results

If

the negative peak of

decrease

diode dynamic

the

negative feedback

tothe

The

oscillator

peak-to-peak,

and

Q2,

and

and

also

consists

4-2.

network

blas

If

detector

bias

level

in a differing

the

forward

resistance.

divider

emitterofthe

amplifier

(figure 5-9)

followers

underano-signal

circuit

coupledtothe

Simplified

consists

part

due

applied
the

osc11-

detects

for

the

imped-

bias

increases

results

and

thus

output

am-

emitter

are

for-

cross-

output

of Q5 and

is

to

is

is

Schematic

CR6.
put, and suppUes
to

control

resistive
4-15.

peakofthe
diodeCR6
of CR6 and
the
of

these
average
period

Diagram

This

circuit

bias

the

dynamlc

voltage

Peak

detector

output

breaks

C25

through C29

biastoCR4and

diodes.

the

bias

voltage

of one

cycle.

0.4

03

divider

signal.

down and

Capacitors

F,

F

0.2

V/

OJ

-

FP _ POSITIVE FEEDBACK

TO AMPLIFIER

F-

FEEDBACK

Figure

TO

4-3.

RC

samples

CR5, which

/'

NETWORK

RC Network

the

oscillator

proportionaltothe

resistanceofthe

network.

Q5

conducts only on

At 7 volts peak, breakdown

the

voltageatthe

decreases.

affects

C25 through C29

applied

FREQUENCY

/

-

-

/,

-

tothedlodes

Characteristics

circuit

output

diodesinthe

the

This

the

resistance

,

-

-

-

-

"-

""'-

RATIO-

PHASE

lOU-I-I!>

out-

signal

negative

junction
changes

act

over

LAG

-

PHASE

LEAD

----

to

the

4-2

Model 2048

S-l.

INTROCUCTION.

5-2.

This

section

information

test

equipment,

dures,

in

the

which

5-3.

5-4.
checking

tabie

5-1.

canbesubstituted

for

and

a trOUbleshooting
section.
verify

REQUIREC

Test

Also

proper

equipment

performanceofthe

Equipment having

provides

the

Model

replacement

included

instrument

TEST

required

for

the

maintenance

2048

Oscillator.

and

adjustment

summary

are

performance

operation.

EQUIPMENT.

for
Model 204Bislisted
similar

equipment

are

maintaining

characteristics

listed.

SECTION V

MAINTENANCE

and

service

Required

proce-

included

checks

and

in

FOR

~

2046

@

o

,..,.

0

DIAL

ACCURACY

CHECK"",

.oon

Paragraphs

~

5232A/~32A

Section V

5-1to5-7

r0 I I0 0 I

-l-t'i<>r·--'====:'....:~..:J

I

"

I
I
I
I

I

I
I
I
I

....

..,T

~330

CID

5-5.

5-6.

2048isoperating
brated.
oraspart
the
has

5-7.

oscillator

PERFORMANCE

The

performance

These

following

been

DIAL ACCURACY CHECK.

a.

Connect

b.

Set Model
RANGE.., .

FREQ

AMPUTUDE.

VERNIER

Instrument
Oscilloscope

Distortion

AC

Voltmeter

DC

Voltmeter

Clip-On Range:

MilUammeter

Frequency

checks

of incoming quality

checksbesure

recently

frequency

outputasshown in

2048

...

, .
..

Type

Analyzer

Counter

checks

normally

may be

calibrated.

counter

controlsasfollows:

Passband:dcto

Measure

Frequency
Voltage Range: 1 mv to 5 volts

Accuracy:
Voltage Range:

Input impedance: at

Counting Range: 5

CHECKS.

verify

andisaccurately

used

control

the

figure

Required

Sensitivity:
Input

Impedance:

, ko

600 kc

negative
to

15

megohms

Accuracy:

Accuracy: 0.03%

that

after

maintenance

inspection.

test

equipment

and 600-ohm load

5-1.

MAX,

centered

Table

Characteristics

0.1

distortionto·40

Range: 5

:1%

voltages

volts

5 to

11

milliamperes

:3%

the

Model

cali-

In

used

to

x,

,

5-1

Required

600

kc

volts/cm

1 megohm

cps

to

Positive

from

least

cpsto600 kc

db

and

100 m

10

'T

Figure

c. Set frequency

Function..

SENSITIVITY. . . . . . . . . . .

DlSPLA
d. Counter should
e.

Set FREQ.

:t:l.5

milliseconds.

Test

Equipment

Waveform

Distortion

AC

voltage

DC

voltage

Charge

Frequency

current

measurements

5-1.

Test

Setup

for

Dial Accuracy

or

Distortion

counter

100 PERIODS AVERAGED

Y .

maximwn

read

dialto20, cOWlter should

Checks

controlsasfollows:

..

cOlmterclockwise

200

:t:6

milUse~onds.

read

Us. Recommended Model

checking

measurement

measurements

measurements

measurements

i5jJ

Mode1175A with

plug-in

i[j)

rEP

@ Model 412A

i[j)

rF}

Model 1753A

Model 33GB/C/D

Model 400H

Model 428A

Model 5232A15532A

3

50.0

I

01369-3

,-,

Section V Model 2048

Paragraphs

5-6to5-9

f. Set FREQ.

:1:0.6

milliseconds.

g. Set

should

h. Repeat

ter

:1:0.06

QUENCY

j.

FREQ.

two.

column

Range
Switch Dial

XI00
XIOO
XI00

RANGEtoXI0and

read

should

milliseconds

L Set frequency counter function switch

(.1).

Complete check

dial

The

three.

XIX
XIX
XIX

dialto50, counter should

FREQ.

the

sameasstep

steps

read

5.00.:1:0.15

as

shown in

counter

Table

Freq.

e and f with

respectively.

reading

5-2

5 500
20
50

5 5 kc

20

50

f.

milliseconds

by

setting

table

should be

Dial Accuracy

2000 cps
5000

20
50

dialto5,

RANGE

RANGE

5-2,

cps

:I:
:I:

cps

% 150

•

kc

•

kc•1.5

read

20. 0

counter

atXlO.

columns one and

15

ao

150
600

Coun-

and

to

switch and

as

shown in

cps
cps
cps

cps
cps
kc

2.00

FRE-

~2048

@

o

"""

T

Figure

5-9.

a.

to

oscillator

5-2.

DISTORTION CHECK.
Connect

outputasshowninfigure

4j!400H

D

~oon

0

Test

and Output Voltage Check

distortion

Setup

,-{

~

for

Frequency

analyzer

and aOO-ohm load

0

t04.-S-U

Response

5-1.

XI0K
XI0K
XI0K

5-8. FREQUENCY RESPONSE

VOLTAGE CHECK.

a.

Connectacvoltmeter

lator

output:asshown in

b. Set Model 204B

to

25.
c. Adjust AMPUTUDE

voltmeter.

d. Sweep FREQ. dial by handtoread

is

swept,

than %0.075 volts.

e, Set Model 204B

f. Set FREQ. dial

g. Complete check with

untested

voltmeter

position while

5
20
50

and

figure

RANGEtoXl

reading

RANGEtoXlO.

to

5 and

RANGE

repeating

50

kc

200

kc

500 kc

AND

aOO-ohm

5-2.

for

should nct

repeat

1. 5 kc

•

•

•

OUTPUT

and FREQ.

2.5

volt reading

step

switch

step

d.

6

kc

15

kc

loadtooscil-

dial

50. As
vary

d.

settoeach

dial

more

on

b. Set Model 204B

RANGE
FREQ .

AMPUTUDE.

c.

Set

distortion

FREQUENCY RANGE.

INPUT .

FUNCTION .
METER

d. On

(1)

(2) Set FUNCTION
(3) Adjust TINE andCOARSE frequency

(4)

e.

Meter

range.

RANGE
distortion
Adjust INPUT SENSITIVITY for full

reading

and BALANCE
frequency
necessarytomonitor

Readjust

reading

controlsasfollows;

.

analyzer

analyzer:

(1. 0).

(1

kc); switch METER

controls

should be

controlsasfollows:

.

to

DISTORTION.

controlfor

until

less

XI00

10

(I

MAX.

XI00

SET LEVEL

100%

dipatfundamental

dip.

absolute

than 1. 0 on

RANGE

dipislocated

kc)

A.

scale

controls

as

the

1%

5-2

Model204B

I

I /

1--/

Paragraphs

Section V

5-10to5-15

5-10.

5-11. When

ploded view,

5-12. COVER REMOVAL.

5-13.
ment
figure

pushing foot

which

a.

Remove

b.

Slide

c.

Slide

d.

REPAIR.

Remove

5-3,

and

top

Lift

foot

repairing

figure

5-4,asan

covers

requires

proceed

top

covertorear,

rear

release.

assemblytoremove.

priortoany checkoradjust-

powertobe

cover

foot

assembly

the

Model 204B,

aidtoidentifying

as follows:

screw.

and

Figure

use

the

applied.

li!ttoremove.

toward

Refer

side

5-3.

ex-

parts.

whlle

to

zeu-r-I'

Cover

Removal

e. Remove bottom

f. Slide bottom

g. Remove
h.

To

the

orderofstepsathrough

5-14.

5-15.
204B
the

large

soldering
pressuretothe
soldering
addition to the aboveinformation, the following should

be

SERVIClKG ETCHED CIRCUIT BOARDS.

The

require

conductor

components,

observed.

side

replace

etched

that the

side

iron

tip

parttoliltitfrom

tip

such

cover

screw

and

liit

covertorear

cover

screws

covers

circuit

of the

suchaspotentiometers,

from

as

and

boards

soldering

board

lead to lead whlle applying

Ungar *855

and

and

foot

assembly,

g.

usedinthe

iron

when

the

3/4

11ft

side

tip

servicing.

boardoruse

in. Cup Tip. In

be

tnt

stand.

to

remove.

covers.

reverse

applied to

rotate

Model

For

the

a

01369-2

5-3

Section V

Paragraphs

5-16to5-24

Model 2MB

a.

Do

not apply

b,

Apply heat to component leadonconductor

of

board,

and

c, Use a toothpick

holes.

d,

Solder

ductor

5-16.

5-17. To

a thorough

or
condition which
vlsuallnspection

block

mary.
troubleshooting
tobetaken
taken in the

5·18,

side.

TROUBLESHOOTING,

locate

visual

loose

components, loose connections of any

diagram,

table 5-3,adaids

for

order

ADJUSTMENT

excessive

remove

replacement

trouble in

inspection. Look

suggestsasource

does not

figure

summary

various

given.

PROCEDURES.

5-19.
5-20.

and -13 volts, but may

line voltageisvaried

voltages should

AC

POWER SUPPLY CHECKS.

Theacpower supply voltages

remain

leadwith a

or

wooden
components from

the

reveal

4-1,

and troubleshooting

for

isolating

lists

troubles;

AND

vary

from12to

from

103,5

with the12to

Figure

heat,

straight

spanter

Mode1204B,

the trouble,

indicationof and

the action should be

5-4.

upward pull ,

start

for

burned-out

of

trouble.

the

trouble.

to

the

use

action

CALIBRATION

are

typically

13.5

volts.

to 126. 5 volts, supply

13,5

volt

Model 204B, Exploded View

5-21. Ripple voltage in theacpowersupply should be

side

clean

con-

with

less

than 2 mv, To check
essary
the junctton of RI0A
as

5-22. When
check
formed,

5·23,

to connect a

the

line voltageisvaried

trouble

CR15

and

adjust

BATTERY CHARGER CURRENT

ADJUSTMENT.

other

If

the

sum-

The

+13

As

limit.

a

5-24,
for
life,
provide a
current

5·25.
current

one input lead of

The

haHerychirger

5.5

:1:0.5milliamperestoprovide

Charge

quick

to not

Use

the

adjust

a.

Remove top

b.

Connect power

c.

Turn

oscillator

d. Attach

5-11.1

e.

Set RI02

CR16

DC

current

charge

more

following

RI02

current

battery

fo,r

ripple

wire

from

and

StD,

from

occurs,

first.

BAL

control

currentissetatthe factory

adjustment

by

than11milliamperes.

procedure

for

quick

cover

from

cordtoa power

OFF,

probeofclip-on

charger

the

desired

voltage. itisnec-

circuit

Measure

103, 5 to

in

theacpower supply

If

any

(paragraph

maximum

RI02

increasing

charge

oscillator

circuit,

charge

ground

ripple

repair

the charging

to

operation.

source.

m11li;lmmeter to

current.

rtf,)

voltage

126,5

volts.

is

5.26).

battery

canbeset

set

charge

chassis.

(See

figure

to

per-

to

5-4

Model204B

Paragraphs

Section V

5-25to5-30

Note

Do

not

charge

amperes

f. Replace top

5-26.

5-27. When the
properly
at the
ceedasfollows:

(With the optional
connect
the junction of

volt reading.Ifnecessary,

for

.zero

5-28. DISTORTION ADJUSTMENT.

output

trol

DC

oscillator

a.

Connect a

b. Set AMPLITUDE to
c.

Adjust

proper

volts, check

a.

terminals.

b. USinganAC

voltage between

exceed11milUamperes.

current

BAL ADJUSTMENT.

adjusted

DC

voltmeter

Ll

DC

range of R15.IfDC

Connect a 600-ohm load

exceeding11milli-

will

shorten

cover.

DC

BAL

there

output.Ifdc Voltageispresent,

DC

voltmeter

Rechargeable

and

SALonrearofinstrument

power

voltmeter,
circuit

battery

control

shouldbenodc voltage

between floating ground and

CI02.)

MAX.

change the value of

supply

ground and

to

Battery

SAL

measure

life.

Rl5

oscillator

will not

for

proper

across

Table

A

(rear

panel)

present

pro-

output.

Power

Supply,

forazero

R18

adjust

voltages.

the

oscillator

the

gain con-

armofpoten-

5-3.

Troubleshooting

tiometer
mv
resistance

is

load

mum reading, Reading should be

to

5~29.

5-30.
performed,
to frequency

oscillator

R36. Voltage should be between90and 140

rms

on aU

ranges.

c. Set Model 204B

d. Connect
e.

a.

of R34;iflow,

RANGE
FREQ"

VERNIER

AMPLITUDE

on

oscillator

Measure

Do
only) and disconnect
from
measurements.

FREQUENCY CALIBRATION ADJUSTMENTS.

Frequency

Connect frequency

Swnmary

...

..
..

distortion

distortion,

not

use

oscillator

onlyifnecessary,

sensitive

outputasshown in figure 5-1.

If

voltageishigh,

decrease

controlsasfollows:

analyzer

output

terminals.

and

Note

coaxial

calibration

cables

all

other

when making

adjustments

after

components.

counter

resistance.

XI00

10(1kc)

centered

..

MAX.

across

adjust

(use twin lead

R36

less

than

equipment

distortion

repairs

and 600-ohm load to

increase

600-ohm

for

mini-

1%.

should be

are

made

Indication

No

output

greater

measured
Cl02

with

No

output

output

No

outputononeormore

Output

distorted

If

all

If

all

signal;dcvoltageatoutput

than±lvolt (de voltage

at junction ofLland

on Option02PowerSupply

Rechargeable

signal;

(zero

volts)

amplitude

ranges

ranges

are

are

Batteries)

proper

net

correct

affected

NOT

affected

dc voltage

ranges

and/or

at

Action

Check
Check

Check

power-supply

Q3, Q4, CR2, and

(refertoschematic

Ql,

Q2, and CRI

(refertoschematic

Check

power-supply
Check Wien
Check
Check

Check
Check components connected

RANGE switch

If

inoperative

Check components connected

RANGE

Check
Check components In

for

for
Xl

Check peak

per
atic

Check for

respectively

Check components connected

affected

bridge

Ql

andQ2for

peak

detector

RANGE

switchisin

power-supply

proper

tolerances).

position, check R24, R4, C2A, RIOA, RI0B,

detector

operation.

diagram.

incorrect

ranae

voltages

voltages

components

correct

circuit

switch contacts

is

inoperative

positionisXl,

voltages

upper

value :I:percentoftolerance

For

circuit

Refer

Be

sure

voltagesatQ3, Q4, Q2, and Ql

(+13

and -13 volts)

CR3

for

correct

diagram)

for

correctdcvoltages

diagram)

(+13

and -13 volts)

voltages

CR4, CR5, and CR6)

(Q5,

to

Wien

position.

check

to

peak

inoperative

(+13

and -13 volts)

and lower

example: When

(Q5. CR4, CR5, and CR6,

towaveforms

CR6

breaks

to

peak

dc voltages

bridge

detector

position.

detector

position when

For

C2A

and C7A.

legs

of Wien

(refertotable

RANGE

and voltages in
down at 7 volts

example:

circuit

-

bridge

switchisin

RIl,

circuit

when

-

6-1

andC7A.

£orpro-

schem-

peale

in

01369-4

5-5

Section V

Paragraphs

5-31 to

5-35

Model204B

b. Set Model 204B RANGE to XI00,
centerofits
clockwise

c.

Set

d. Lock FREQ.
socket
serts

into

e.

Loosen

ure

5-5a,

a5.6-kc

L

Tighten

locking

g. Set FREQ. to 5 (500
locking

h.

Loosen

by

turning

i.

Tighten

locking

j.

Repeat

within
adjustC8(figure
(figure 5-4) to obtain a 560-kc output.

change the

k.

m.

n.

within

approximately
Set

Set

Check
steps
All
:1:3%.

5-31.

5-32.

5-33,
orderitby

For

CAM

If

easier

range,

poSition.

FREQ. to56(5.6

set

screw

threaded

potentiometer

and

adjust

output.

pot

screw.
screw.

screw.

dial

camtoobtaina500-cps

dial

stepscthroughiuntil

RANGE

FREQ.

value

gain

a and b of

frequencies

and AMPLITUDE to

kc).

dial

shaft

(dial

shaft

hole

on topofdial

potbyturning

shaft

locknut,

shaft

shaft

locknut and

±1%.

to XI0K, FREQ. to 5 (50 kc),

5-6) to

to

56

of C14

control

paragraph

obtain
(560

Note

across

with a

locking
(pot)

and

cps)

and

locknut

for

voltage

and

a 50-kc outpuL

kc),

proper

according

5-28.

the band should

shaft

pot

output.

and

REPLACEMENT PROCEDURES,

CABLE REPLACEMENT.

it

is

necessary

rEjJ

Stock No. 8160-0003 and

access

to the

to

replace

cams,

remove

VERNtERto

maximum

number

screw)

shaft

locknut,

armtoobtain

loosen

tighten

adjust

loosendialshaft

frequencies

adjust

If

range

the

description.

8-32
which
housing.

dial

shaft

dial

shaft

dial

necessary,

of C15.

to

cam

cable,

the

screws

in-

fig-

cam

are
and

C15

be

holding the

the two

guide,

a.
b. USingahex

remove

c. Remove

d. On

inches

e.
bolt
shownInfigure

L With

boltasshown,

g.
second
terminal

h.
use

the
cams,
cam.

Aand

I.

in

cable

not

overtighten

j.

(paragraph

5-34.
5-35.

RI0A and B,itis
For
holding the
swing the twa

as

a guide, and

a.
instruments
counterweight

powersupplyandcircuit

assemblies

and

proceedasfollows:

Orient

from

Slide

so

Slide

Orientate

(The

B; the

Tighten

Perform

easier

Position

camsasshown in

both

cable

replacement

the end.

replacement

that

cableisorientated
mark
cable

terminal

boltasshown in

figure

and

install

shorter

longer

both

and allow

5-29).

FREQUENCY
REPLACEMENT.
To

replace

access
power

assemblies

have

shownInfigure

to the

socket

terminal

terminal

5-5a,

on the

install

ends
bolt

the

as

a gUide. SUde the

the

cable

length
terminal

the

cable.

Frequency

the

necessary'toremove

supply

proceedasfollows:

camsasshown in

aluminum

side.

wrench

bolts.

bolts

from

cable,

lower

terminal
approximately
so

figure

camsas

second

length

dialtocover

POTENTIOMETER

frequency

to the

placeamark

cable

left

cableincenterofterminal

boltondial

that

cableisorientated
5-5a,

showninfigure

terminal

should

should

pass

boltstoremove

Calibration

cams,

and

circuit

to the

cams

5-5.

board,

Use

figure
and

cable.

through

to

detail,

its

potentiometer

remove

side.

figure

Other

then

figure

5-5a.

3/8-inch

one

terminal

1/4

inch

upper

left

cable

bolt

on the pot

pass

over

overD,B,

full

range.

Adjustments

the

the

board,

Use

figure

5-5a.

which have the

instruments

swing

5-5asa

wrench,

6-7/8

terminal

bolt

cam.

through

detail
5-5band
onto the

points

and C .

all

slack

(pot),

pot

cam.

screws

then

Some

as

to

.

Do

5-5

TERMINAL

BOLT

LENGTH

5-6

LOtlO

"r

>/6

MARK

$HQUI.D

Itl

CENTEIl

,","'

LEtlGTH

,y)

_

V

B!

Figure

5-5.

Cams

and

COUNTEIlWEIO"T

PA"~I.

BIJSI1INQ

POT

SHAFT

~T

A~M

C~BLE

TERMINAL

POT

CAM

DIAL

$HAFT

LOCKNUT

DIAl-

CAM

Cable

Relationship

NUT

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Model 204B

Paragraphs

Section V

5-36 to 5-37

have

plastic
weight.
following
plastic

cams

Ignore

procedure

cams.

b. Loosen pot

c. Using a hex
bolt on
cable

tion of

use
cable
over
over

imately

pd

cam

slips

off

cam.

d. Slide

pot:

cableisshorter

e, Remove

I.

Remove

g.

Orient

the

figureasa guidetohelp you

properly.

three
pot.

the

(The
pointsAand
points

h.

L

D. B,

Turn

Install

cable

1/2

turntoremove

counterweight and

nut, COWlterweight

as

showninfigure

j.

Align pot

k. Remove aU

terminal

bolt clockwise. Do not

which do

any

references

when

shaft

socket

counterclockwise

cam

off

screws

and

cams

not

your

locknut and

wrench,

pot:

arm.

than

the

holding

install

as

showninfigure

require

to

counterweight in

instrument

panel

turn

1/2

Note

other.

pot:tochassis.

replacement.

string

shorter

B;

the

and

terminal

C.)

cable

longer

length should

bolt clockwise

some

slackinthe

length should

tighten

is

keyed and shouldbepositioned

5-5.

(omit if no cOWlterweight).

camtothe

slack

same

planeasdial

in cable by tm-ning

overtighten

.........._10

Figure5-6.

a cOWlter-

has

bushing nut.

cable

terminal

turn

or

that

one

5-5b

the

approx-

cable.

panel

bushing

cam.

cable.

10PT10~

Range Swit ch

the

until

sec-

and

cam
pass
pass

cable

~OWE~

,v_ny

020.cy\

m.
n.

paragraph

5-36.
5-37.

rP)

figure

RANGE
To

Stock No. 204B-95D,

5-4,

a.

Remove

b.

c. Remove

the

RANGE switchtofront paneL

d.Inorder
necessarytoslide
edgeofchassis;

e.

ure

5-6asa guide

I.

Install

removedinstep

g.

is

adjacenttoOFF

h.

i.

and

Perform

DC

Detail

With

cams

aligned, tighten pot shaft locknut.

Perform

Frequency

5-29.

SWITCH ASSEMBLY REPLACEMENT.

aidinreplacing

and

range

oscillator

Remove RANGE

indicator

to

remove

switch away

clip

Solder

leadstoreplacement

for

switchasshown in

c.

Replace

indicator

position.

Replace

switch knob.

Frequency

BAL

Adjustment,

Calibration

the

RANGE switch

refer

switch

switch

detail.

covers

decal

leads

to

(see

knob.

and

the

the

from

from

leadsatswitch

correct

lead

figure

decalsothat

Calibration

Paragraphs

".,-,

...

Adjustments,

assembly

exploded view.

figure
paragraph

5-6.

5-12).

nut whichholds

switch, it

panel and lift

terminals.

switch using fig-

connections,

5-4 using nut

black

portion

Adjustments

5-29 and 5-26.

Is
to

01369-4

5-7

Section V
Paragraphs

5-38 to

5-46

Model

2048

5-38.

5-39.

battery-powered

mercury

~ Stock

Supply
Refer

BATTERY-PACK POWER SUPPLY.

To

convert

batteries,

No.
according
to

paragraph

an

Model 204B

obtainastandard

204B-64B.

to

Instructions

AC-powered

for

Install

3-26

Battery-Pack

for

battery

instructions.

5-40.

5-41. To
battery-powered
power, obtain

204B-llA.

AC-Operated

Included

5-42.

5-43.

replace
Supply.

nickel-cadmium
operation

115/230 volt

50 to 1000

supply
poweredora
ation from a
obtain

llC.
accordingtoinstructions

5-44. After
been
output voltage level.

open

llator

cedureinparagraph

AC POWER SUPPLY.

convertabattery-powered

Model 204B

AC

Power

(Refertofigures

Power

with

kit.

RECHARGEABLE BATTERY POWER SUPPLY.

The

Rechargeable

the

standard

This

supply

Supply

Battery

contains

batteries

and a

charge

(selected

cps

power

is

approximately3watts.

circuit

by switch on

line.

battery-powered

reChargeable

Rechargeable

Install

Rechargeable

Battery

for

Supply Kit, <§lStock

5-8 and

accordingtoinstructions

Battery

Packorthe

four

which

which

Power

Model 204B for

battery
Kit,
Battery

included with kit.

installed,

circuit

OFF

and

Rechargeable

turn

oscillator

(2.5Vrms

recharge

Battery

on and check

If

level

into 600 ohms),

batteries

3-16.

CAUTION
BE SURE TO PLACE 115/230 VOLT
LINE SWITCH (SlOl)

IN
POSITION BEFORE CONNECTING
POWER CORD TO A POWER SOURCE.
(SEE PARAGRAPH

5-45. REPLACEMENT

2-12.)

OF

RECHARGEABLE

BATTERIES.

5-46. When
ment,

disconnect

The

following

a.

Disconnect

side

and

b. Remove

rechargeable

power

cord

batteries

and

procedureisrecommended:

power

cord

covers.

six

screws

holding

turn

and

or

reChargeable

operation

Battery

from

Pack,

Power

Included with

kit.

replacement

or

rechargeable

operation

Power

6.25
permit
operates

rear

5-12.)

Supply can

AC

volt

panel

from

Install

Power
sealed

portable

from

S10l)

input to this power

To

convert

an

oper-

r$}J

Stock

Power

power

Power

supply,

No.

2048-

Supply

Supply

maximum

is

below5.0 V

follOWing the

turn

rms

osci-

pro-

PROPER

require

oscillator

remove

rear

top, bottom

panel in

replace-

OFF.

place.

AC

No.

AC

has

RE:AR

SIDE

SCREWS

POLARITY

DESIGNATION

REAR

SCREWS

SIDE

a

REAR

PANEL

Figure

5-7.

Rear

View of

Battery-Powered

REAR

SCREWS

2048-S-11A

PANEL

Model 204B

d.

Loosen two

in

place.

e. Slide

f.

Unsolder

black, and

g.

Remove two

washerS

h.

Remove

power

violet

from

screws

supply out of

resistor

wires

cap

battery

and

discard

RI06

from

nuts

holder

holding

(4.7

batteries

and

and

rear

old

batteries.

oscillator

oscillator

ohms),

(see

figure

screws

panel.

board

chassis.

red/orange

5-9) .

with

fiber

CAUTION

DO

NOT DISPOSE

BURNING,

AS

OF

BATTERIES BY

THEY EXPLODE

IF

INCINERATED.

i.

Place

observing

four

battery

new

polarity

batteries

as

indicatedinfigure

in

instrument

5-9.

c. Remove four

circuit

boardinplace.

5-6

screws

holding

battery

charger

j.

fiber

Replace

washers.

battery

holder

cap

nuts,

screws,

01369-3

and

Model204B

Section V

Figure

5-8

VIOLET BLACK

RED/ORANGE

AC

SUPPLY

115/230

SWITCH

CHASSIS

AC

POWER

CONNECTOR

2048-5-184

k.

Solder

R106,

wirestobatteries.

m.

Slide

power

fasten

Wires)
orange

n.

p.
ground
BTl04.

ground

with

screws
Tighten
Check

screws

voltage

and bottom

(See

figure

mustbenegative

wire)

mustbepositive

{black

wireonbottom

01369-4

red/orange,

(See

figure

supply into

5-9.)

oscillator

removedinsteps

loosenedinstep

and

polarity

terminals

5-9.)

on

batteries

TerminalonBTlOl

and

,terminalonBTl04

with

terminalsofBTI02

black,

band

d.

between

respect

Figure

and

chassis

c.

floating

BTI01

to floating

5-8.

violet

and

and

(violet

(red/

and

AC

Power

BTI03).
approximately
either
less
installed.

satisfied,
oscillator

open
OFF

in

Supply

Measured

13

terminal

than

1 volt),

q.

When conditions of

turn

oscillator

output

r.

If

maximum

circuit

and

paragraph

5.

recharge

Replace

is

less

3-16.

top, bottom and

voltageateither
volts.

or

measured

If

batteries

previous

on and

voltage.

oscillator

than

5.0Vrms,

batteries

terminal
polarityisreversed
voltageislow (usually

have not

been

steps

measure

properly

have

maximum

output voltage into an

turn

by following the

side

covers.

oscillator
procedure

will be

at

been

5-9

Section

Figure

V

5-9

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Internal

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01369-2

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Paragraphs

Section

VI

6-1to6-7

6·1.

INTRODUCTION.

6-2.

This

sectlon

replacement

numerical

indicates

part,

together

11sts

partsinalpha-numerical
numbers
each

part:

a.

Description

parts.

order

the

description

and

provides

with any

below).

b.

Typical

code; see

c.

Manufacturer's

d.

Total

e.

Recommended

maintenance

available

manufacturer

llstofmanufacturers

quantity

during

upon

request.

contains

Table

of

their

of the

stock

usedinthe

spare

one

information

6-1

Hsts

reference

and ~

stock

applicable

orderoftheir@istock

the folloWing

part

(see

11stofabbreviations

of

the

In appendix.

number.

instrument

part

quantity for

year

of

SECTION

REPLACEABLE PARTS

6·4.

for

ordering

parts

In

designators

numberofeach

notes.

Table

information

partina

five-digit

(TQ column).

complete

isolated

alpha-

and

6-2

on

service

6-5.

inquirytoyour
Service
OfficesisproVided

manual.

6-6.

6-7.

give

function and location.

VI

ORDERING

To

orderareplacement

Office. A map of

Specify the folloWing

a.

Model and

b.

Hewlett-Packard

c.

Circuit

d.

Description.

Toorderapart

complete

authorized

complete

reference

descriptionofthe

INFORMATION.

part,

Hewlett-Packard

all

Hewlett·Packard

for

your

use

information

serial

numberofinstrument.

stock

number.

designator.

not

Hstedin

address

at the

Tables

part

order

Salesor

Field

rear

of the

for

each

6-1

and

and include

or

part:

6-2,

its

6-3.

Miscellaneous

listed

at

the

end of

..

auembly

A

..

motor

•

- cilpaeltor

C

_

dlod,

CR

- delily Une

OL

..

device

OS

•

E

A

..

BP

_

BWO

..

CEa..ceramic
CMO_cablnel

COEY

.. coefflclenl

COM..common
COMP_ eomVJllUon
CON:S..cOlll'JecUOn

CRT • cathode_

OEPe.

EtA _ 'I\lbelortr.lnalltt:lu

o by

ELECT..dectrolytlc

E:-CAP..encap.ll1ated

alil\&lIna:

mllc

electronic

amperu

bandpall

backward wa,..,

oe:clllalOr

depolll-.1

meetln.lt
Indultrlel'

tion

ltandardl
normally
In'lrument

\IIithln .peclflciltlone;
lube.

illld

aelecled

p;?rformanct
suppliedIfordered

f1'

atock

table

pllrl

mOWlI only

...ylUbe

carbon

Electronic

Alaccla_

\1111I

result

operatini

lunalllOrs

lor

bUI

\11111

numbera.

parts

(lamp)

In

be

not indexed in

6-2.

P

•

fUlle

PL

-

filtH

J

• Jack

K

relay

-
_ In.ductor

L

meter

_

M

MP

• mechanical

P

PXC

G£

GL

GRO

H

HC

HR

IMPG

l:-CD
l:-S

K

L.lr\

LOG

M

MA
MINA

T _

METFJ.,M.

l.lYR _ malll.lfacturer

!otT(;

- mounting

1.1Y•mylar

table

6-1

REFERENCED~GKATORS

part

-

fands

..

fixed

_ lterIran!um

lu

-a

•

·Ir~nd{~

•

henri"

.. merC\lty

_ boo.lr(.)

.. I:npregr.aled
.. Ir.eandeaeent

- 1n.u\.1t!0ll

-

kUo.

•

Ilnear

•

loprithmlc

_meg_We

.. milliamperes

miniature

melal

(ed)

1000
taper

fll:n •

are

P

Q ..

R •

RT

S _ 1\IIIIch

T -

ASPREVlAIIONS

NC

~E

NO

NPO

NSR

OHO

P

PC

PF

PP-peLk·lo-peak

taper

PIV • peak Inverae
POR •

pas

POLY-

POT • potentiometer
RECTa r«:tUle.-

..

pl\li

tnl.nalltor
nllelor

-

lhermlltor

tranaformer

- normally cloaed

.,~

..

norlD&1ly

_

neptive

(r..ro
coelflcumt)

• not.

repl.lcll!llJ:lle

• order by d

Krl_

.-

- printed

b",,<i

- pleal'aradll -
10'12.

voltaa'

porcelain

• poaltlon(ll

po!y.tyr.ne

ROT

•

rotary

RIoiS

..

root-

R:lofO•rack

ope1l

~Itive

lemperat\1rlt

Iepe.ratel,

..

circuit

lanell

meaD-
lIlOIUll

.quare

anly

uro

v _ n.cuum tuM.

twb,

W _

X - .oclr.et

XP •

XDS

Z _ network

5-B

SE

B.!CT.

51

stL

S1.

TA _ taotalum

TO

n •

TOG-tonle

TOL • tolerallC.

TRIM -

TWT..travellllC

U

VAC
VAR

wi

W

WW

WiD

, _ Illlmber

photocall. etc.

eatj,

Juaelloldtr

.. Lampbolder

...

Iow.blow

.. lIelen.iwn

IecUon(.)

_

.llieon

••

l1v1!r

..

tUde

• Ume delay

Ulll.1llll.Dl

trimmer

_

miero.

_ vacuum

variable

_

• with
wattl

-

• wlrewound

- without

• optimum vLiu.

lelecled

averaa'vaIu.

.bawD
be

dladd.

'""'v.

10·

allaCIOry.

(part

omitted}

n_

lube

e

may

I

01369-3

6-1

Section
Table

V1

6-1

Circuit

Reference

Table

*Stock No.

6-1

Index by

Reference

Description

Designator

Note

Model

204B

Al

A2

A3

A4

A5

AS

A7

A8

BTl

CI
C2

C3
C4
C5
CS
C7

thru

BT4

204B-19A

204B-65D

200CD-34

2048-64B

1420-0010
0150-0084

0170-0076

0140-0174
0140-0173
0140-0108
0140-0172
0170-0076

Assigned

Not

Not

Assigned

Assy,

Cl

C3

range

thru

switch,

C6

C8

C14
C25
CRt

Ll

Q1

thru

R40A!B

BTl

3.05

Ixd,

circuit

thru

C20

thru

C32

thru

CR6 RIB

Q5 R34

attenuator,

DC

power

thru

BT4

mercury

cer,

~l

mica,
mica,
mica,
mica,

Assy,

Assy, output

Assy,

Not AsSigned
Not AsSigned

Battery,
C: lxd,

C: fxd, poly, 3

C: fxd,
C: fxd,

C:

C: fxd.
C: txd, poly, 3

includes:
R1

thru

R3

R5,

H6

81

board,

0.1

inc ludes:

R4,

RB,

R9

Rll,

R13, R14

thru

R26

R29, R30

thru

R39

includes:

R4l,

R42

supply,

jJl

sect

0.305
3050 pf

305 pf :tl%, 100 vdcw
253 pt :t2%, 300 vdcw

3000 pI :t1%, 100 vdcw

sect

type: 5

+80%

:1:1%,

~l

:1%,

:1%,

includes:

cell,

6.75

-20%,50vdcw
25 vdcw

0.0305

100 vdcw

25 vdcw

V

jJl

C8
C'

CI0

thru

C13

C14
C15

C16
C17
C18

ClQ
C20

C21

thru

C24

C25
C26

C27
C28
C28

C30,

C31

C32

CRI

CR2

CR3

CR4,

5 1910-0016

CRS

0130-0017
0150-0096

0140-0021
0130-0016

0180-0045
0140-0100
0150-0042

0150-0055
0180-0063

0180-0112
0180-0104
0180-0045

0180~111

0170-0038
0150-0096
0180-0104

1902-0054
1910-0016
1901-0025

1902-0072

c:

val',

cer,

8-50

pf, 500 vdcw

C:

£Xd,

cer,

0.05

I1f

+80%

Not ASSigned

IXd,

C:

C:

c: Ixd,

C: I"d,

C: I"d,

C:

C: fxd,

Not Assigned

C: fxd,

C: fxd,
C: {xd,

C:

C: f"d, my,
C: fxd.
C: fxd,

Diode,

Diode, Ge: 100 rnaat1 V, 60
Diode, SI: 50 rnaat1 V, 100 PIV

Diode, Ge: 100 rna
Diode, breakdown:

mica,

val',

elect,
mica,
Ti0

fxd. Ti02, 10 pI :5%, 500 vdcw

elect,
elect,

alumtnum
elect,

fxd,

elect,

cer,
aluminum

breakdown:

39

cel',

pl·

5-25

pI, 500 vdcw

20

p.t.

33 pI

:1:5%,

,

4.7

2

pl·

500

p.f

2000

pl,

elect,

20

~f,

tanta

2pi:1:.20%,

0.22pf:tlO%. 200 vdcw

0.05pi+80%
elect,

18.5

at1V,

7.75VzO.

-20%. 100 vdcw

:1:10%,

500 vdcw

25

vdcw

500 vdcw

:1:.5%.

500 vdcw

-10%+100%, 3 vdcw
1 vdcw

200

pf,

25 vdcw

-20%, 100 vdcw

200

pi,

V :to. 5 V

PIV

60 PIV

25 V

15 vdcw

25 vdcw

15 vdcw

6-2

See

introductiontothis

,

section

01369-4

Model204B

_

l:ircuit

Reference

!@J

Table

Stock

No.

6-1.

Index bv

Reference

Description

Designator

(cont'd)

Note

Section

Table 6-1

VI

Jl

Li
Pi

P2,

P3

Ql

Q2
Q3

Q4

Q5

Rl

R2

R3
R4

R5

R6

R7

R8

R9

RI0A/B

5060-0634
5060-0635

0340·0086

0340-0091
9140-0107

1850·0071
1850-0096

1850-0003
1854-0003
1850-0062

0683-1845
0687-2751
0687-5651

0727-0095

0687-5651

0687-2751
2100-0277

0687-2701
2100-0276

Binding

post,

red

Binding post, black
Insulator,
Insulator,

double, black
triple,

black
Inductor: fxd, RF, 27
Noi Assigned

Part

of WI

Transistor:

~

stock
Transistor:
Transistor:
Transistor:
Transistor:

R:

fXd,

R:

fXd,

R:

fXd,

R:

fXd,

R:

fXd,

R:

fXd,

2N1516, speCially

no. 1850-0003,

Ge, 2N2189

2N1516/0C170

81.

Ge

camp, 180K ohms
camp,2.7M
camp, 5.6M
dep c, 900
camp, 5.6M

comp, 2.7M±10%,

Not 'Assigned

R:

var,

camp, lin, 100 ohms

R:

fXd,

comp, 27 ohms

R:

var,

ww,

dual ganged

1st

sect:

10K ohms

2nd

sect:

lin, 10K

±10%,
±10%,

ohms

±10%.

ohms

/.Lh

color

±1%.

±1(}%,

±10%

±5%,

1/2W
1/2W

1/2W
1/2W

±1%,

selected

coded

1/4W

1/2W

±20%,

1/2W

1W

from

orange

0.3W

Rll

R12

R13, R14

R15

RI6

R17

RIB

R19

R20

R21

R22

R23
R24

R25,

26

R27,

28

R29

RSO

R31

thru

R34

R35

RSB
RS7

R38

RS9

R40A/B
R41, R42

R33

0727-0095
0687-1801

2100-0299
0687-1031

0727-0112
0686-2035
0686-3325
0687-3311

0686-6225
0687-4701
0727-0134

0687-1201
0687-5601
0687-4701

0686-6215

0686-2015
0687-1011

2100-0108
0687-1831
0698-0001
0687-1031

2100-0113
0686-6215

R:

fxd. dep c, 900

ohms

Not Assigned

R: fxd, camp, 18 ohmS
R:

var,

camp. lin,

R: fxd, camp, 10K ohms

R: fxd, dep c, 1.

R:

fXd,

camp, 20K.

R:

fXd,

R: fxd, comp, 330 ohms
R: fxd, camp,

R: fxd, camp,

R:

R: fxd. camp, 12

R:

camp, 3. 3K

fxd, dep c, 4. 44K ohms

fxd. camp,56ohms

3K

8K

ohms
ohms
ohms

6.2Kohms
47

ohms
ohms

Not Assigned

R:

fxd, camp,

R:

fxd, camp, 620

47

ohms

ohms

Not Assigned

R:

fxd, camp,

R:

fxd, camp, 100 ohms

R:

var,

R:

fxd, camp, 18K

R'

fXd,

camp,

R:

fXd,
R:
R:

camp, 10K ohms
var,
fxd, camp, 620

200.ohms

camp, lin, 100 ohms

ohms

4.7

ohms

camp, dual tandem, 100K/25K,

ohms

±1%.

±10%,

ohms

±10%,

±1%.
±5%,
±5%.

±10%,

±5%,

:1:10%,

±1%.

±10%.

±10C;'b,

±10%,

±5%,

:1:5%,

:1:10%.

:l:10%,

:1:5%,

:1:10%,

±5%.

1/2W

1/2w

±20%,

1/2W
1/2W
1!2W
1/2W

1!2W

1/2W

1!2W
1!2W
1/2W
1/2W

1!2W

l!2W

1!2W

±30%,

1!2W

1/2W

1/2W

1!2W

0.3W

1/2W

1/3W

2W

*See

introductiontothis

section

6-3

Section
Table

VI

6-1

\,;ircuit

Reference

@:

Table

Stock

No.

6-1.

Index bv

Reference

Description

Deshmator

Model204B

cont'd

Note

51

AI

3100-0275

204B-6D
204B-40B
204B-108F

0510-109
0510-110
0570-0056

0590-0035
0590-0036
0590-0050

1410-0003

2190-0016

3050-0019

B160-D003

204B-I08E

0370-0062

0370-0082

0370-0087

5000-0702

5000-0710
5040-0615

5060-0705
5060-0727

B160-0003

9211-0057

9211-0058

9220~0029

9220-0080

204B·11A

Switch.

(see

Power
Assy,
Assy,

Wing Nut

i6

Terminal
Clamping Nut (used with locknut)
Panel
Pot

Panel

3/B

#10
Cable

Cam
Knob, VERNIER
Knob, A.\ll:PLITUDE
Knob,

Cover,

Cover, bottom

Battery

only)

Cover,

Foot
Cable,

Carton,
Carton,
Filler,
Filler,

Assy,

J3,

rot:2sect.6pos.

range

switch

MISCELLANEOUS

Supply
dial
cam

Cap Nut

bushing nut

shaft locknut

Bushing

Internal

flat

drive

Plastic

RANGE

assy,

AC

S2,

Bracket

(see

(Battery

(Rechargeable

Bolt

lock

washer

- 15-315"

side

Holder

haU

recess

third

cam

(16" length)

inner

outer

T & B

ends

OPTIONS

Option 1

power

Tl,

A2,

Figure

washer

(Rechargeable

module

supply, includes:

assembly

5-5)

Pack

Power

top

WI

(NSR)

A3)

Battery

Supply only)

Power

Battery

Power

Supply only)

Supply

obcl#

6-4

A2

C35.

36

C37

C38,

39

C40
C41

CR11

thru

CR1S, CRIB

J3

R51

RS2thru

R57

S2

CR14

204B~65B

0180·0050
0180·0058

0180·0050

0180-0058
0180-0104

1901-0025

1902-0238

1251-0148

0693-1031

0686-241S
3101-0033

Assy,

AC

power

C35

thru

CR11

thru

C: fltd, aluminum

50

vdcw
C: fltd,
C;

50

C; fxd,
C:

Diode, Si;
Diode, breakdown:

Connector, power: male, 3 pin

R:
R:

Switch,

elect,

fxd,

aluminum elect,

vdcw

elect,

fxd,

aluminum

fxd, comp, 10K oh.ms :10%,
fxd;

comp, 240 ohms

sl:

*See introdUCtion to

supply board, includes:

C41

R51

thru

CRIB

elect,40p.f

50

p.f

-10%

50

p.f

-10%+100%, 25 vdcw

elect,

50

rnaat1V,100 PIV

12.5V-13.5

DPDT

this

section

R57

-15%

+100%,

+100%,25,"dew

40

Jif -15%

200

p.f, 15 vdcw

:1:5%,

.1:100%

V

2W

1/2W

01369-4

Model 204B Section

Table

Table

6-1

IndexbyReference

Designator

(cont'd)

Circuit

Reference

$I;

Stock No.

Description

Note

MISCELLANEOUS (cont'd)

VI

6-1

Tl

WI

A100
BTlOl

thru

9100-0120
8120-0078

204B-llC
1420-0015

BT104

C101

0180-0149

C102 0180-0140
CR101

thru

1901-0025

CR104
CR105 1902-0074
CR106 1901-0025

J101

1251-0148

QIOI 1850-0064
RlOl

R102
R103
Rl04
R105
R106

5101

TlOl

W1D1

0758-0007
2100-0391
0686-3015
0687-3331
0687-3921
0698-0001

3101-0033
9100-0172

8120-0078

Transformer,
Cord,

power

power

Option 2

Assy,

rechargeable

Battery,

225 rna

C:
C: fxd,

Diode,

fxd,

elect,

elect,

51:

rechargeable,
hours

65pf-10%
300pf-10%

50

rnaat1V,100 PIV

Diode, breakdown:
Diode,

Connector,
Transistor,

R: fxd,

R:

51:

metallic-oxide,

var,

ww, lin, 1000

50

rnaatIV, 100 PIV

power

Ge,

PNP,

R: fxd, comp, 300
R: fxd, comp, 33K
R: fxd, comp, 3900
R: fxd, comp,

Switch,

sl:

Transformer,

Cord,

power

4.7

DPDT

power

battery

7.15V

male,

ohms

ohms

ohms

ohms

power

NICd,

6.25

+1000/0,60vdcw

+100%,

±5%

3 pin

2N1l83

ISO

ohms

ohms

±20%,1.25W

±5%,

1/2W

±10%,

±5%,

±10%,

1/2W

1/2W

1/2W

supply

V,

10 vdcw

±5%,

1/2W

204B-65F

Assy,

includes:
C10l

CR101

Q101

rechargeable

thru

CRl06

battery

RIOI
T101

power

thm

supply

RiDS

board

01369-4

if

See

Introductiontothis

section

6-5

Section
Table

Stock

6-2

<Ii

VI

No.

Table

Description

6~2.

Replaceable

Parts

Mfr.

Mfr.

Part

Model204B

No. TQ

200CO-34

204B-60

204B-IIA

204B-llB
204B-IIC
204B-19A

204B-40B
204B-64B

204B-658

204B-65F

204B-I08E
204B-I08F

Assy, output

R40A/B

R41, R42
Power
Assy,

J3

S2

Not

Assigned
Assy,
MSy,

CI
C3

thru

C8

MSy,

Dial

Assy,

DC

BTl

thru

Assy,

Power

C35

thru

R51

thru

Assy,

C14

thru

C25

thru

CRI

thru

LI

Ql

thru

MSy,

Board,
CIOI RlOI
CRIOI

QIOI

Cam,

plastic:

MSy,

attenuator

Supply

AC

Rechargeable
Range Switch,

Circuit

Rechargeable

cam

Bracket

Power

A2

C6 R5, R6

Power

C41
R57

C20 R4,
C32

Q5 R34

includes:

thru

Tl

BT4

CR6

CRI06

Supply,

WI

Supply,

Supply

Board,

pot

Battery

Board,

Battery

TIOI

and

includes:

includes:

includes:

Rl

thru

SI

includes:

CRII

thru

includes:

RB,

RIl,

Rl3,

RI6

thru

R29, R30

thru

thru

dial

Power

R3

includes:

CRI6

H9

R14

R26
R39

Power

Rl05

Supply

Supply

28480

28480

28480

28480
28480

28480
28480

28480

28480

28480

28480
28480

200CO-34 I

2048-60
204B-llA

204B-llC

204B-19A

2048-408
204B-648

2048-65B

2048-

650

204B-65F

204B-I08E
204B-I08F

1
1

1

I

1

1

1

1

1

2

1

0130-0016
0130-0017

0140-0021
0140-0100
0140-0108

0140-0172
0140·0173
0140·0174

0150-0042
0150-0055
0150-0084

01SO-0096
0170·0038
0170-0076

6-6

C:

var,

cer,

C:

var,

cer,

C; bcd,

C:

C:

C; bcd,

C; bcd,

C: bcd,

C:

C:

C:

c:
C: fxd, my,

C: bcd, poly, 3

3.05

mica,

fxd,

mica,33pf

fxd,

mica,
mica,

mica,

mica,

fXd,

T102,
fxd, T102, 10 pf
fXd,

eer,

fXd,

cer,

0.22

III

0.305

5-25 pf, 500 vdcw

8~50

pf, 500 vdcw

39

pt-

%10%.

:5%,

253 pf

:1:2%,

3000 pf
305 pf

%1%,

30SOpf±I%, 100 vdcw

4.7

pf·

±5%,

0.1

Ilf

+80%

0.05

Ilf

+80%

Ilf

%10%,

sect

±1%,25vdcw

Ilf

0.0305

*

See

SOO

vdcw

SOD

vdcw

300 vdcw

:1:1%,

100 vdcw

100 vdcw

±5%,

500 vdcw

500 vdcw

-20%,50vdcw

-20%,
200 vdcw

Ilf

introductiontothis

100vdcw

72982
72982

00853
00853

72136
72136

72136
72136

82142
82142

72982

91418

56289
56289

section

557-019-COPO 1

39R

557-019-U2PO-

34R

OR1439BI0
CMI5E33OJ I
RCMISE

(253pIG)

OM19F302F
OMI9F30SOF 1
OMI9F(3051)F

100 VDC

Type

JM

obdH

Type

JM

obdlll

845-222-Y5VO-

1042

TypeTAobdf

148P22492 I

lllP

1

1

1

1
I

1
1

I

3

2

01369-4

Model 204B Section

Table

6 2 Replaceable

-

Parts

(cont'd)

Table

VI

6-2

<i

Stock No.
0180-0045 C: fxd,

9180-0050

018040058
0180-0063
0180-0104
0180-0111

0180-0U2
0180-0140

0180-0149

0180-0155
0340-0086
0340-0091
0370-0062 Knob, VERNIER
0370-0084 Knob, AMPLITUDE
0310-0087 Knob. RANGE

0570-0056
0590-0035

0590-0036

059040050

0683-1645

0686·1035

0686·2015

0686-2035

0686-2415

C,

lxd,

",,100%,50vdcw

C,

Cxd,

C,

fxd,

C,

fxd,

C,

fxd,

C,

fxd,

C,

lxd,

C,

fXd,

C: fxd,
Insulator:
Insulator:

Terminal

Clamping

Panel-bushing

Pot

shaft

R,

fxd,

R,

fxd,

R,

rxd,

lxd,

R'
R,

lxd,

Description

elect,20J.lf,

aluminum

elect,50J.lf
elect,
aluminum
elect,

elect,

500

tanta,2J.lf

tanta.
double,
triple.

Bolt
Nut

(used

nut

locknut

2000

300

65

180K

20K-
240

elect.
elect,

elect,

camp,
comp, 10K
comp, 200·
camp,
camp,

25 vdcw

elect,

40

+100%

J.lf

-10%

elect.

J.lf

black

200

+20%,

J.lf,

1 vdcw

J.I!

-10%

-10%

+100%,

2.2

J.lf

black

with locknut)

ohms

ohms

:"=5%.

ohms

:"=5%.

ohms

ohms

:i5%.

J.lf,

-15%

-10%, 25 vdcw

-tl0~,

+100%,

:i20%. 25 vdcw

:i5%, 1/4W

J.lf,

1/2W

3 vdcw

15 vdcw

25 vdcw

10 vdcw

60

vdcw

1/'1»1

:"=5%.

1/2W

1/2W

Part

MCr.

56289

56'89

56289 30D186AI
56289 30D120Al
56289 30DI
56289

56289
56289

56289

56289
28480 0340-0086 1
28480 0340-0091 1
28480 0370-0062
28480 0310-0084
28480

Nylok
05704
05704

84396
OU21

01121
01121
01121 EB2035 1
01121 EB2415

MCr.
Type

032538 4

t09D107C20

30T2

410

Y972t7

150D225XOO

20AZ

037040081

5OM-S-35U
100-Z

l00-Z
ESNA-96NTM.

CB1845

EBI035
EB2015

No.

30 D 2

HAl

Type 1

TQ

2

1

3

1

1

1

1

1

1

2
2
2
2

1

1
1

6

0686-3015 R txd,
0686-3325
0686·6215
0688-6225

0687-1011
0687-1031
0687-1201
0687-1801 R fxd,
0687-1831

0687-2701
0687-2751
0687-3311
0687-3331
0687-3921

0687-4701
0687·5601
0687-5651
0693-1031
0698-0001

0727-0095
0727-0112
0727-0134
0758-0007

R,

rxd.

R,

rxd, compo

R fxd,

R,

fxd.

R,

fXd,

R,

fxd,
fxd,

R'

fxd,

R'

fxd, comp, 2.7M

R'

rXd,

R'

fxd,

R'

fXd,

R'
R,

rxd.

R,

fxd.
txd.

R'

lxd,

R'
R,

lxd,

txd, dep c. 900

R'

lxd,

R'

{xd,

R'
R,

Ixd,

camp,
comp, 3. 3K

camp,
camp,

camp,
camp,12ohms
camp.
camp,

camp,27ohms
camp,

camp,
camp,

camp,47ohms
camp,56ohms

camp.
camp,
camp,

dep
dep

metallic-oxide,

300

ohms
ohms

620

6.2K
100

ohms

10K
18

ohms

18K

330

ohms
33K
3900

5.6M
10K

4.7

ohms

ohms

c,l.8K
c, 4. 44K

ohms
ohms

ohms

ohms

:1:10%.

ohms

ohms

ohms

ohms

ohms

:"=5%,

1/2W

:"=5%.

1/2W

:i5%,

1/2W

:i5%.

1/2W

:ilO%. 1/2W

:il0%,

1/2W
:il0%,
:ilO%, 1/2W 01121

:1:10%,

:ilO%,

:10%, 1/2W

ohms

1/2W

:1:10%,

:1:10%,

:1:10%.

:1:10%,

:i5%.

:l:1%.

150

1/2W

1/2W

1/2W

1/2W

1/'1»1

:i10%.

1/2W

:ilO%. 1/2W

2W

1/2W
1/2W

:1:1%.

:tl%.

ohms

1/2W

1/2W

1/2W

:1:5%,

1/2W

OU21 EB3015 1
01121 EB3325 1
OU21 EB6215 3
OU21 EB6225 1

OU21
01121 EBI031
01121

01121
01121

01121
01121 EB3311 1
01121 EB3331 1
01121 EB3921 1

01121 EB4'101 2
01121 EB5601
01121
01121

01121
19701 DC1/2CR5 2

19701

19701

07115 C20 1

EBI0U
EBI021

EB1801
EB1831

EB2701
EB2751

E85651

HBI031

EB4'1GS

DCl/2CR5
DCI/2BR5

1

2
1
2
1

1

2

2

2

1

1

1

1

01369-4

l!

See

introductiontothis

sectlon

6-7

Section

Table

Stock No.

9

VI

6-2

Table

6-2.

Description

Replaceable

Parts

(cont'd)

Mfr.

Mfr.

Part

No.

Model204B

TQ

1251-0148
1410·0003
1420-0010

1420-0015
1850-0003
1850-0062

1850-0064
1850-0071

1850-0096
1854-0003

1901-0025
1902-0017
1902-0054
1902-0072
1902-0238
1910-0016

2100-0108
2100-0013

2100-0276

2100-0277
2100-0299

2100-0391
2190-0016

Connector,
Panel

Battery,
Battery
Transistor:
Transistor:

Transistor:
Transistor:

from*stock
code

Transistor:
Transistor,

Diode,
Diode,
Diode,
Diode,

Diode, breakdown:

power:

Bushing

mercury

NiCd

6.25
2N1516/0C170
Ge

Ge,
2N1516,

orange.

Ge, 2N2189

Si

51:

50

rnaat1 V, 100 PIV
avalanche,
breakdown:
breakdown:

male.3pin

type: 5

V.

225 rna

PNP,

2N1183

specially

no. 1850-0003,

6.8

V::I:IO%

18.5

7.75V%0.

12.5V-13.5

Diode, Ge: 100 rnaat1 V,

R:

var,

1/3

W

R:

var,

R:

var,

1st

sect:

2nd

sect:

R:

var,

R:

var,

R:

var,

3/8

Lnternal lock

comp,
camp,

WW,

comp, lin, 100
comp, lin, 3K

ww,

linear,

dual

dual

10 K

ohms

Un, 10 K

Un,

washer

tandem,

ganged

ohms

1000

100

ohms

ohms

ohms

cell,

%0.5 V

60
ohms

2 W

±1%,

::1:20%,

::1:20%,

6.75

hours

selected
color

25 V

V

PIV

±30%

1 W

::1:20%,

V

0.3

0.3

1/2W

W

W

oooou

28480

09569
88220
73445
49956

02735

28480

OOooT

07263
98925

28480
28480
28480
28480
73293

11237
01121

16688

11237
71450

28480
78189

H-I061IG-3L
50M-A-3611
TR235R-3164

69

5N32T
2NlS16/0C

170
T51602
2N1183
1850-0071

2N2189

5-3056
CSD2693

1902-0017
1902-0054
1902-0072
1902-0238

801445

UPE70

JJ59160

10-42-1516

Type

UPE65

CV

70

2100-0391

obd'

2

3

4

4

1
1

1
1

1
1

10

2

1
1

2

3

1
1

1

1

1
1

2

3050-0019
3100-0275

3101-0033

5000-0702
5000-0710
5040-0615

5060-0634

5060-0635
5060-0705
5060-0727

8120-0078
8160-0003

9100-0120
9100-0172
9140-0107

9211-0057

9211-0058

9220-0029

9220-0080

6-6

iHO

Flat

Washer

Switch,
Switch,

Cover,
Cover,
Battery

rot:2sect,8position

(see

range

51:

side

bottom

Holder

Supply only)

Binding

post:
BInding post:
Cover,
Foot

Cord,

Cable,

half

aS5Y,

power

cam

Transformer,
Transformer,
Inductor,

Carton,
Carton,

FUlter,
FUler,

fxli,

inner
outer

T & B

ends

switch

DPDT

(Rechargeable

red

black

recess

third

module

(15 -

3/5"

power
power

RF,

f

assembly

A31)

top

length)

obdi

27~h::1:10%

See

introductiontothis

(NSR)

Battery

Power

78471
76854

42190
28480

28480
28480

28480
28480
28480

28480

70903
28480

98734
98734
99800

28480
28480
28480
28480

section

50MB637
217393-K2

4633
5000-0702

5000-0710
5040-0615

5060-0634
5060-0635
5060-0705
5060-0727

KH-4147
8160-0003

9254
2120
1840-38

9211-0057
9211-0058
9220-0029
9220-0080

4

1

2

2

1

1

2

1
1

2
2

1
1

1
1

1

2

1
1

Mod,1204B

(ffj)

MAN

UAL

BACKDATI

MODEL 204B

OSCILLATOR

NG

CHANG

ES

App,"dix

C

To

adapt

changes

Instrument

",-

?44-

"'-

,",-

CHANGE

this

manualtoinstruments

shownintables.

This

backdating

Instruments.

yet

are

number

Serial

111

not

Prefix

Manual

Manual

with

other

manual

Instrument-component

listedinthe

giveninthe

Make

backdating

manual.

Manual

change

Changes

, ,

I , ,

, , ,

Paragraph

add:

Table6,MISCELLANEOUS

delete:

5-22,

Counter

@ Stock

weight on pot wlll

Serial

serial

sheet

step

No.

Prefixed:

Printed:

6/64

prefixes

NOTE

makes

values

Sheet,

b

204B-I08E,

this

that

shouldbereplaced

Instrument

35-00276to-00421·

135-00101 to -00275

come

416-

check

manual

differ

cam

for

errata

applicabletothe

from

thoseinthe

Serial

Prefix

offatthis

plastic:

below, and

using

time.

pot

and

make

earlier

manual,

the

stock

Make Manual Changes

1 2 3 4 5

2 3 4 5 6

1

dial

CHANGE #2

CHANGE

CHANGE #4

#3

Paragraph

Add

reach

Paragraph

Change to
bottom

Paragraph

Change to

Table

Cover,
Cover,
Cover,

Foot

Table6and

R14:
R13:
Rll:
R9:
R4:
02:

Table
Table

R51:

5-14,

1st

sentence:

the

nuts on

5-14,

read:

cover.

5-14,

read:

6, MISCELLANEOUS

half
bottom:
side:

Assembly,

Figure
changetoResistor,
changetoResistor,

changetoResistor,
changetoResistor,
changetoResistor,

changetoTransistor,
6, Change to

1-1,

Frequency

changetoResistor,

step

b

Top

and

bottom

the

bolts

holding

step

c

Slide foot

step

Sl1de foot

recess

top:

changet$Stock No. to 5000-0710

changet$Stock No. to

third

5-9

Assy

releaseofrear

d

assembly

changer$Stock No. to 5000-0706

module:

fixed,

fixed,

fixed, mfgl,
fixed,
fixed, mfgl,

2NI516!OC170, $ Stock No. 1850-0003

dial

to @ Stock No. 204B-40A

Range: Change to 5

fixed,

covers
the

side

toward

204B-44A-l

change'$Stock No. to 5060-0725

camp,

comp,

lKO

camp,

330

lKn

camp,

12KS?

mustberemoved

covers.

foot

assembly

side

and

220:1:5%, 1/2

.270

:1:10%,

:1:1%,

:1:5%.

:1:1%.

cpsto500 kcin5

:1:10%,

1/2

1!8W,@StockNo.

1!2W,

1/8W,

2W.rgStock No. 0693-1231

firstinorder

towards

lift to

W,

t$

W,

@ Stock No. 0666-3305

ifi,

Stock No. 0757-0029

center

remove.

Stock No.

r$

Stock No. 0687-2701

ranges

0686·2205

0757·0029

to

of

01369-1

SupplementBfor

204B-904

iC-l

Appendix C

Manual

Changes

Model 204B

Page

2

Model 204B

Instrument

'5'-

'''-

'''-

'"'-

*'

Exclude

CHANGE

CHANGE

Serial

serial

.5

/f6

Prefix

numbers

00377
00378
00379
00381
00383
00385

Make Manual Changes

,

, 2

, , ,

, , ,

below:

00388
00390
00394
00396
00397
00398

eR3:

change

R25, 26: change to

<$

Stock No. 0687-2701

Figure

CtB: changetocapacitor,

change

5-9

voltage

00399
00400
00402
00404
00407
00410

to Diode,

Resistor,

across

Instrument

",_on",

,,,_nn,n1'n_on,,;

00411
00413
00414
00415
00416
00418

germanium,

eR3 to

10 pf

fixed,

0.3
:t:5%,

rfii,

volt

Serial

Prefix

_on""

Make Manual

, , , ,

"""

00420

Stock No. 1910-0016

composition,

500 vdcw,~Stock No. 0150-0055

27

ohms

:t:lO%,

1/2

Changes

W

iC-2

Supplement B

204B-904

for

01369-1