Marantz 2220B User manual

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model

2220B

FM

signals

induced

on

a

FM

antenna

are

led

to

FM

antenna

coil

L101

through

a

balun

coil.

These

signals

are

then

applied

to

the

FET

RF

amplifier

which

in

turn

applies

its

output

to

the

Mixer

H102

through

the

double

tuned

high

selective

circuits.

The

Mixer

convert

its

input

signal

into

10.7MHz

intermediate

frequency

and

amplifies

it

at

the

same

time.

The

H103

is

a

local

oscillator

and

its

output

is

injected

into

the

base

of

Mixer

transistor,

the

injection

voltage

is

about

50mV.

The

10.7MHz

front

end

IF

output

is

led

to

the

amplifier

unit

through

a

coaxial

cable.

The

IF

amplifier

unit

consists

of

five

stages

of

IF

amplifiers.

Two

pieces

of

ceramic

filters

are

used

to

obtain

high

selectivity

a

pair

of

symmetrical

diode

limiter

is

also

employed

for

the

best

limiting

characteristics,

improved

capture

ratio

and

good

AM

suppression.

A

part

of

IF

amplifier

H202

is

rectified

by

the

diodes

H211

and

H212

and

its

DC

output

is

fed

back

to

the

gate

of

FET

RF

amplifier

to

decrease

the

gain

of

it

with

increased

input

signal

strength.

3-1.

Muting

and

Auto-Stereo

Switching

Circuits

The

muting

circuit

consisting

of

all

solid-state

electrical

switching

has

been

incorporated

in

the

Model

2220B.

The

DC

voltage

obtained

by

rectifing

the

sub

|F

output

signal

from

the

H206

is

applied

to

the

base

of

H207

and

turns

on

it,

if

the

sub

IF

output

is

greater

than

predetermined

level

(muting

threshold

level).

When

the

H207

turns

on,

the

muting

switch

transistor

H208

is

turned

on,

thus

decreasing

the

emitter

collector

resistance

to

near

zero

ohm

and

allowing

emitter

current

path

to

the

Final

1F

amplifier

H205.

When

the

input

signal

is

lower

than

the

predetermined

level,

the

DC

output

obtained

is

small

and

can

not

turn

on

the

H207

thus

the

H207

keeps

its

turn

off

state

and

this

makes

the

switch

transistor

keep

H208

turn

off,

then

no

emitter

current

is

supplied

to

the

H205

and

signals

below

the

threshold

level

are

muted

out.

The

muting

threshold

level

can

be

varied

by

adjusting

the

trimming

resistor

R253.

The

DC

voltage

obtained

is

also

used

to.make

the

Auto-Stereo

switching

transistor

H209

turn

on

and

off.

3-2.

MPX

Stereo

Decoding

Circuit

The

stereo

composite

signal

from

the

FM

detector

undergoes

a

phase

compensation

by

R303

and

C304,

is

applied

to

the

input

terminal

2

of

the

MPX

stereo

decoding

IC

H301

on

a

PLL

(Phase

Locked

Loop)

basis,

and

decoded

into

the

left

and

right

stereo

signals,

which

become

available

at

pins

4

and

5

respectively.

These

decoded

left

and

right

stereo

audio

signals

are

introduced

through

a

!ow

pass

filter

composed

of

L301

to

L304

and

C309

to

C318

for

elimination

of

undesirable

residual

switching

signal

and

through

a

de-emphasis

network

consisting

of

R314,

R315,

C319

and

C320,

into

the

npn-pnp

direct

coupled

audio

amplifier,

where

the

signals

are

amplified

to

a

required

level

for

the

output

from

J307

and

J308.

From

these

terminal

the

audio

signals

are

led

to

the

TAPE

OUTPUT

jacks

through

the

function

switch.

Figure

1

presents

an

internal

block

diagram

showing

the

functions

of

the

PLL

basis

MPX

stereo

decoding

IC

HA1156.

The

input

stereo

composite

signal,

amplified

by

the

audio

amplifier,

is

delivered

to

the

phase

detectors

PD-1

and

PD-2.

A

part

of

the

stereo

composite

signal

is

also

applied

to

the

stereo

decoder

section.

The

VCO

(Voltage

Control

Oscillator)

produces

a

free

run

oscillation

in

the

neighborhood

of

76KHz

with

the

time

constant

determined

by

a

capacitor

C303

and

resistors

R304

and

R305

set

on

the

outside

of

14.

The

VCO

output

has

its

freqeuncy

divided

into

19KHz

through

the

two

stages

of

the

frequency

divider

(DIV-1

&

DIV-2),

and

is

reverted

to

the

phase

detector

PD-1,

which

contains

two

input

terminals

designed

to

produce

an

output

in

proportion

to

the

product

of

the

two

input

signals.

The

signal

applied

to.one

of

the

inputs

of

PD-1

is

the

19KHz

square

wave

formed

through

frequency

division

of

the

76KHz

VCO

output

signal

by

the

two

stages

of

the

frequency

divider

‘sbi

NOON

CitmM

iene

INTRODUCTION

This

service

manual

was

prepared

for

use

by

Authorized

Warranty

Stations

and

contains

service

information

for

Marantz

Model

2220B

Stereophonic

Receiver.

Servicing

information

and

voltage

data

included

in

this

manual

are

intended

for

use

by

the

knowledgeable

and

experienced

technician

only.

All

instruction

should

be

read

carefully.

No

attempt

should

be

made

to

proceed

without

a

good

understanding

of

the

operation

in

the

receiver.

The

part

lists

furnish

information

by

which

replacement

part

may

be

ordered

from

the

Marantz

Company.

A

simple

description

is

included

for

parts

which

can

be

usually

be

obtained

through

local

suppliers.

1.

SERVICE

NOTES

As

can

be

seen

from

the

circuit

diagram,

the

chassis

of

Model

2220B

consists

of

the

following

units.

Each

unit

mounted

on

a

printed

circuit

board

is

described

within

the

square

enclosed

by

a

bold

dotted

line

on

the

circuit

diagram.

1.

FM

Front

End

&

AM

Tuner...

.....

0c

eee

ee

eee

mounted

on

P.W.B.

P100

2.

FMIF

Amplifier,

Detector,

Muting

Control

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

mounted

on

P.W.B.

P200

3.

MPX

Stereo

Decoding

Amplifier

.......

0...

cee

eee eee

mounted

on

P.W.B.

P300

4.

Phono

Amplifier

..

0...

ce

es

mounted

on

P.W.B.

P400

5.

Tone

Amplifier

....

0.0...

ce

cc

eee

eens

mounted

on

P.W.B.

PEO1

6.

TAPE

Montor,

Mono,

Low

and

High

Filter

Switch

Unit

.....

mounted

on

P.W.B.

PHO!

7.

Loudness,

Muting,

Main

and

Remote

Switch

Unit

.........

mounted

on

P.W.B.

PTQO1

8.

Power

Amplifier

..

0.0.0.0...

ccc

ee

ees

mounted

on

P.W.B.

P700

9.

Power

Supply

......

0.

cece

eee

ce

eee

eens

mounted

on

P.W.B.

P800

10.

Dial

Lamp

Unit

2...

...

0

cc

eee

ee

eens

mounted

on

P.W.B.

PZ0O1

2.

AM

TUNER

All

components

except

ferrite

bar

antenna

are

mounted

on

a

printed

circuit

board

P100.

The

AM

signals

induced

in

a

ferrite

bar

antenna

are

applied

to

the

RF

amplifier

section

of

’

the

AM

tuner

IC

H104

through

a

capacitor

of

C129

and

amplified

to

the

level

required

for

overcoming

the

conversion

noises,

thus

giving

good

S/N

performance.

The

tuned

circuits

inserted

in

both

out

and

input

circuit

of

the

RF

amplifier

assure

very

high

image

and

spurious

rejection

performance.

Thus

amplified

and

selected

AM

signals

are

then

applied

to

the

converter

section

through

a

coupling

capacitor

C132.

While

the

local

oscillator

voltage

is

injected

through

a

capacitor

C131,

both

AM

signals

and

oscillating

voltage

are

mixed

and

converted

into

455K

Hz

intermediate

frequency.

The

resulting

IF

signal

is

applied

to

the

first

IF

transformer

L110

consisting

of

one

ceramic

filter

and

two

tuned

circuits.

The

output

of

L110

is

led

to

the

IF

amplifier/detector

section

of

H104.

The

detected

audio

signal

is

obtained

from

11

of

H104

and

amplified

to

a

required

level

(about

470

mV

far

400Hz

30%

mod.)

by

the

amplifier

H105

and

fed

to

the

function

switch.

2.1

Suggestions

for

AM

Tuner

Trouble

Shooting

Check

for

broken

AM

bar

antenna,

an

oscilloscope

to

the

11

of

H184

0

J112

and

check

for

audio

signals

with

the

tuning

meter

deflected.

If

detected

audio

signal

is

obtained

at

11

of

H104,

no

failure

may

exist

in

the

AM

tuner

IC

H104

and

its

associate¢

circuit.

If

no

audio

signal

is

obtained

at

11

of

H104,

check

all

voltage

distribution

in

ths

AM

circuits

by

using

a

DC

VTVM.

3.

FM

TUNER

The

FM

Tuner

section

of

Model

2220B

is

divided

into

three

functional

blocks:

FM

fron

end,

IF

amplifier

&

Detector,

Muting

control

and

MPX

stereo

decoding

circuit.

DIV-1

and

DIV-2,

and

the

19KHz

pilot

signal

included

in

the

stereo

composite

signal

as

a

reference

signal

is

applied

to

the

other

input.

Therefore,

the

output

of

PD-1

which

has

passed

through

the

low

pass

filter

LPF-1

provides

DC

output

voltage

in

proportion

to

the

phase

variance

between

the

two

inputs.

This

DC

output

voltage

is

amplified

by

the

DC

amplifier,

and

supplied

to

the

76KHz

VCO

as

a

contro!

voltage.

This

means

that

the

output

frequency

and

phase

of

the

VCO

have

been

phase-locked

to

the

input

pilot

signal.

The

38KHz

sub-carrier

reproduced

by

PLL

as

stated

above

is

delivered

through

the

stereo

switch

to

the

stereo

decoder

section

as

a

switching

signal,

thus

driving

the

decoder

section.

One

of

the

inputs

of

PD-2

is

given

the

19KHz

resulting

from

the

frequency

division

completed

by

DIV-1

and

DIV-3,

whereas

the

other

input

gets

the

19KHz

output

contained

in

the

composite

signal,

and

the

output

is

provided

with

a

DC

output

in

proportion

to

the

amplitude

of

the

pilot

signal.

This

DC

output

is

furnished

through

LPF-2

to

the

trigger

amplifier

which

drives

the

stereo

indicator

lamp

and

stereo

switch.

Therefore,

insufficient

supply

of

the

pilot

signal

results

in

failure

to

light

the

stereo

indicator

and

to

turn

on

the

stereo

switch

located

in

the

path

of

the

38KHz

switching

signal,

thereby

avoiding

a

wrong

stereo

operation.

H303

attached

on

the

outside

of

8

isa

switching

transistor

for

automatic

monaural-stereo

switchover.

When

the

intensity

of

an

incoming

signal

from

an

FM

station

is

weaker

than

a

predetermined

level,

this

H303

is

turned

on

and

8

is

grounded,

thereby

developing

a

condition

for

monaural

reception.

For

a

forced

monaural

operation,

switch

the

MODE

switch

to

“NONO,”

an

H303

comes

into

an

“On”

condition

with

the

positive

bias

voltage

applied

to

the

base,

and

8

is

grounded,

thereby

establishing

monaural

operation.

The

transistor

H302

connected

externally

to

14

is

intended

to

stop

the

76KHz

oscillation

of

the

VCO

Which

interferes

an

AM

signal

during

the

reception

of

an

AM

station.

When

the

function

switch

is

set

to

‘“AM”

position,

a

positive

bias

is

charged

on

the

base

of

H302,

H302

is

turned

on,

and

14

is

grounded.

Thus,

the

oscillation

of

the

VCO

is

stopped,

ending

the

interference

with

AM

reception.

3.3

Suggestion

for

Trouble

Shooting

of

FM

Tuner

3.3.1

Symptom:

No

FM

Reception

First

turn

ON

the

power

switch

and

try

to

tune

FM

stations.

Rotate

the

fly-wheel

tuning

knob

slowly

and

observe

the

FM

tuning

meter.

lf

the

turning

meter

deflect

at

several

frequencies

received,

the

tuner

circuits

preceding

the

discriminator

circuit

may

have

no

failure.

When

no

reading

is

obtained

in

the

meter,

check

FM

local

oscillator

circuit,

using

a

RF

VTVM.

The

normal

local

oscillator

voltage

is

one

or

two

volts

(fms)

at

the

tuning

capacitor,

depending

on

the

tuning.capacitor

position.

If

the

local

oscillator

voltage

is

normal,

all

voltage

distributions

in

the

FM

Front

End

and

IF

amplifier

unit

and

compare

them

with

those

shown

in

the

circuit

diagram.

When

the

tuning

meter

deflects

but

no

sound

is

obtained,

check

audio

circuits,

using

a

high

sensitive

oscilloscope.

3.3.2

Symptom:

No

Stereo

Separation

First

check

the

“MONO”

switch

is

in

normal

out

position.

Connect

a

FM

RF

signal

generator

output

modulated

by

a

stereo

modulator

to

the

rear

FM

antenna

terminals,

and

check

the

stereo

beacon

is

turned

on

or

not.

If

not

turned

on,

check

for

19KHz

VCO

output

signal

(R312

Test

Point),

using

an

oscilloscope

and

a

frequency

counter.

4.

PHONO

AND

PRE-AMPLIFIER

Signals

from

the

tuner

and

AUX

jacks

are

applied

to

the

selector

switch.

Signals

from

the

PHONO

jacks

are

applied

to

the

phono-amplifier

consisting

of

transistor

H401,

H403

and

H405.

The

gain

of

the

amplifier

is

40

dB.

The

amplified

and

equalized

phono-signals

are,

then,

fed

to

other

section

of

the

selector

switch

which,

in

turn,

applies

output

signals

from

the

tuner,

phono-amplifier

and

AUX

jacks

to

the

TAPE

1

MONITOR

switch

and

TAPE

OUT

1

jacks.

The

TAPE

1

MONITOR

switch

applies

the

signals

to

the

balance

and

volume

controls.

The

controlled

signals

are

fed

to

the

pre-amplifier

consisting

of

HEO1,

HEO3

and

HEOS,

HEO7.

Frequency

response

of

the

amplifier

can

be

varied

by

BASS,

MID

and

TREBLE

controls.

The

controlled

output

are

then

led

to

the

main

amplifier

through

high

and

low

pass

filter

pushswitches.

5.

MAIN

AMPLIFIER

Transistor

H701

and

H703

are

a

differential

amplifier

coupled

to

the

transistor

H70O7.

Transistor

H707

drives

the

inverter

transistors

H721

and

H723

which,

in

turn,

drive

the

power

stage

consisting

of

HOO1

and

HOO2.

Transistors

H709

and

H721

are

current

limitters

and

operate

as

power

protecting

circuits.

Excessive

currents

flowing

into

the

power

stage

are

detected

by

the

resistors

R749

and

R747

and

the

resultant

variations

are

applied

to

the

transistors

H709

and

H711

and

make

them

turned

on.

This

decreases

the

current

flowing

into

the

H721

and

H723.

In

this

way

the

currents

flowing

in

the

power

stage

(HOO1

and

HOO2)

are

restricted

within

a

safe

value.

6.

AUDIO

TROUBLE

ANALYSIS

1.

Excessive

line

consumption

re}

.

Check

for

shorted

rectifiers

H801,

H802.

.

Check

for

shorted

transistors

HOO1,

HOO2,

Check

LOOS

for

short.

a.

Check

line

cord,

fuse,

shorted

HOO5,

HOO6,

H725.

b.

Check

for

open

rectifiers

H801,

H802

or

open

LOOS5.

a

ion

2.

No

line

consumption

or

zero

bias

.

Check

filter

capacitors

C002,

C004.

.

Check

for

defective

capacitors,

C707,

C708, C715,

C716.

5.

Improper

clipping

a.

Check

for

proper

adjustment

of

R711,

R712.

3.

High

hum

and

noise

level

4.

Parastic

oscillation

Figure

1.

Dial

Stringing

Seininnectatclen

6.

Note:

During

tracking

alignment

reduce

the

signal

generator

output

as

necessary

to

avoid

AGC

action.

co

NI

12.

Repeat

procedures

4

and

5

until

no

further

adjustment

is

necessary.

FM

ALIGNMENT

PROCEDURE

Connect

a

FM

signal

generator

to

the

FM

antenna

terminals

and

an

oscilloscope

and

an

audio

distortion

analyzer

to

the

tape

output

jack

on

the

rear

panel.

Set

the

FM

SG

to

87

MHz

and

provide

about

3

to

5uV.

Place

the

tuning

pointer

at

the

low

frequency

end

by

rotating

the

tuning

knob

and

adjust

the

core

of

oscillator

coi!

L104

to

obtain

maximum

audio

output.

Set

the

FM

SG

to

109

MHz

and

provide

about

3

to

5uV.

Rotate

the

tuning

knob

and

place

the

tuning

pointer

at

the

high

frequency

end

and

adjust

the

trimming

capacitor

C118

for

maximum

output,

Repeat

steps

2

and

3

until

no

further

adjustment

is

necessary.

Set

the

FM

SG

to

90

MHz

and

tune

the

receiver

to

the

same

frequency.

Decrease

signal

generator

output

until

the

audio

output

level

decreases

with

the

decreasing

generator

output.

Adjust

the

ANTENNA

coil

L101,

RF

coil

L102

and

L103

and

IF

transformer

L105

for

minimum

audio

distortion.

Set

the

FM

SG

to

106

MHz

and

tune

the

receiver

to

the

same

frequency.

Decrease

the

signal

generator

output

until

the

audio

output

level

decreases

with

the

decreasing

generator

ouput.

Adjust

the

trimming

capacitors

of

ANTENNA

and

RF

tuning

circuits

for

minimum

distortion.

Repeat

steps

5

and

6

until

no

further

adjustment

is

necessary.

Connect

a

DC

VTVM

with

1

V

range

selected

to

the

resistor

R237

(inside)

and

adjust

the

secondary

core

(black)

of

discriminator

transformer

L201

so

that

no

voltage

reading

is

obtained

on

the

VTVM

at

no

signal.

the

FM

SG

to

98

MHz

and

increase

the

output

level

1

KuV,

then

tune

the

receiver

to

the

same

frequency

so

that

no

deflection

is

obtained

on

the

VTVM.

Adjust

primary

core

(pink)

of

L201

for

minimum

distortion.

.

STEREO

SEPARATION

ALIGNMENT

.

Set

the

FM

SG

to

provide

1

KuV

at

98

MHz.

Tune

the

receiver

to

the

same

frequency_so

that

the

center

tuning

meter

pointer

indicates

its

center.

Then

turn

off

the

modulation

of

the

FM

SG,

connect

a

frequency

counter

to

test

point

R312

(point

C)

and

adjust

R

304

so

that

the

frequency

counter

may

a

precisely

read

19

KHz.

Modulate

the

FM

SG

with

stereo

composite

signal

consisting

of

only

L

or

R

channel

(of

course

a

pilot

signal

must

be

included).

Adjust

the

trimming

resistor

R

303

for

maximum

and

same

separation

in

both

channels.

»-MUTING

THRESHOLD

ADJUSTMENT

.

Set

the

FM

SG

output

to

provide

12.5uV(!IHF)

at

98

MHz

and

tune

receiver

to

the

same

frequency.

Adjust

the

trimming

resistor

R

253

for

the

threshold

level

of

12.5uV.

(During

this

adjustment

turn

the

MUTING

pushswitch

“‘on’’.)

POWER

AMPLIFIER

ADJUSTMENT

Connect

a

VTVM

between

J712(+)

and

J718(—)

and

adjust

the

trimming

resistor

R733

until

the

VTVM

reads

20

mV

DC.

And

next,

connect

a

VTVM

between

J723

and

J722

(GROUND)

and

adjust

the

trimming

resistor

R711

until

the

VTVM

reads

0

mV

DC.

Do

over

again.

For

the

other

channel,

connect

the

VTVM

between

J713(+)

and

J719(—)

and

adjust

the

R734

for

the

same

reading,

and

connect

the

VTVM

between

J724

and

J722

and

adjust

the

R712

for

the

same

reading.

Do

over

again.

.

13.

POWER

SUPPLY

ADJUSTMENT

Connect

a

VTVM

between

J812(+)

and

J811(—)

and

adjust

R808

until

the

VTVM

reads

35.0

V

under

no

signal

condition.

7.

TEST

EQUIPMENT

REQUIRED

FOR

SERVICING

Table

1

lists

the

test

equipment

required

for

servicing

the

Model

2220B

Receiver.

Item

Manufacturer

and

Mode!

No.

Use

AM

Signa!

Generator

Signa!

source

for

AM

alignment

Test

Loop

FM

Signal

Generator

Less

than

0.3%

distortion

Less

than

0.3%

distortion

Use

with

AM

Signal

generator

Signal

source

for

FM

alignment

Stereo

Separation

alignment

and

trouble

shooting

Stereo

Modulator

Weston

Model

CVO-100P,

less

than

0.02%

residual

distortion

is

required.

Audio

Oscillator

Sinewave

and

squarewave

signal

source.

MPX

Oscillator

adjustment

(VCO)

Waveform

analysis

and

Trouble

Shooting,

and

ASO

alignment.

Frequency

Counter

High

sensitivity

with

DC

horizontal

and

vertical

Oscilloscope

amplifiers.

Circuit

Tester

em

ee

ae

Trouble

Shooting

AC

Wattmeter

Simpson,

Model

390

Monitors

primary

power

to

Amplifier.

AC

Ammeter

Commerical

Grade

(1-10A)

Monitors

amplifier

output

under

short

circuit

condition.

Line

Voltmeter

Commercial

Grade

(0-150VAC)|

Monitors

potential

of

primary

power

to

amplifier.

Variable

Autotransformer

Powerstat,

Model

116B

Adjusts

level

of

primary

power

to

amplifier.

(0-140VAC,

10

amps.)

Shorting

Plug

Use

phono

plug

with

600

ohm

|

Shorts

amplifier

input

to

eliminate

noise

across

center

and

shell.

pickup.

Output

Load

(8

ohms,

Commercial

Grade

Provides

8-ohm

load

for

amplifier

output

0.5%,

100W)

termination.

‘Output

Load

(4

ohms,

Commercial

Grade

Provides

4-ohm

load

for

amplifier

output

0.5%,

100W)

termination.

8.

AM

ALIGNMENT

PROCEDURE

AM._IF

Alignment

1.

Connect

a

sweep

generator

to

the

J106

and

an

alignment

scope

to

the

resistor

R120

(out

side).

2.

Rotate

each

core

of

IF

transformers

L110

and

L111

for

the

maximum

height

and

flat

top

symmetrical

response.

AM

Frequency

Range

and

Tracking

Alignment

1.

Set

AM

.signal

generator

to

515

KHz. Turn

the

tuning

capacitor

fully

closed

(place

the

tuning

pointer

at

the

low

end)

and

adjust

the

oscillator

coil

L109

for

maximum

audio

output.

2.

Set the

signal

generator

to

1650 KHz.

Place

the

tuning

pointer

in

the

high

frequency

end

and

adjust

the

oscillator

trimmer

on

the

oscillator

tuning

capacitor

for

maximum

audio

output.

3.

Repeat

step

1

and

2

until

no

further

adjustment

is

necessary.

4,

Set

the

generator

to

600

KHz,

tune

the

receiver

to

the

same

frequency

and

adjust

a

slug

core

of

AM

ferrite

rod

antenna

and

RF

coil

L108

for

maximum

output.

5.

Set

the

generator

to

1400

KHz

and

tune

the

receiver

to

the

same

frequency

and

adjust

both

trimming

capacitor

of

antenna

and

RF

tuned

circuit

for

maximum

output.

antic

ats

aczat

sit

ici

ee

se

STEREO!

i

JO15

S00

RES3

RES2

REI

Ro02

S002

Figure

2.

Front

Panel

Adjustments

and

Component

Locations

MOoo2

—

p300—

m0

pagg

P20)

P700

4001

~

coo)

H004

C18

ir

gem

eres

ares

PIBil

L005

Figure

3.

Main

Chassis

Component

Locations

(Top

View)

woot

1805

CAUTION

FOR

CONTINUED

PRE

FECTION

AGAINST

FIRE

HAZARD

REPLACE

QWiY

WITH

SAME

TYPE

2

AMP

2508

FUSE

3601

Sam

Figure

4.

AUX

PHONO

Rear

Panel

Adjustment

and

Component

Locations

Figure

5.

Main

Chassis

Component

Locations

(Bottom

View)

ji

Di

ia

eects

Nace

res

eesscataab

Sea

Figure

6.

FM

Front

End

and

AM

Tuner

Assembly

P100

Component

Locations

Figure

7.

FM

IF

Amplifier,

Detector,

Muting

Control

and

Meter

Amplifier

Unit

Assembly

P200

Component

Locaioms

Marantz 2220B User manual

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