NAD 7220PE Manuale utente

SERVICE

—

MANUAL

CONTENTS

-7220PE

/

7020e

REAR

/

FRONT

PANEL

CONNECTIONS

SPECIFICATIONS

ALIGNMENT

METHOD

PCB

LAYOUT

AND

WIRING

DIAGRAM,

AMP

,

7220PE

/

7020e

PCB

LAYOUT

AND

WIRING

DIAGRAM,

TUNER

,

7220PE

/

7020e

PCB

LAYOUT,

AMP

,

7220PE

SCHEMATIC

DIAGRAM,

AMP

,

7220PE

PCB

LAYOUT,

AMP

,

7020e

SCHEMATIC

DIAGRAM,

AMP

,

7020e

PCB

LAYOUT,

TUNER

,

7220PE

/

7020e

SCHEMATIC

DIAGRAM,

TUNER

,

7220PE

/

7020e

PARTS

LIST,

EXPLODED

VIEW

EXPLODED

VIEW

PACKING

DIAGRAM

--

2--

PAGE

11

13

15

17

19

21

23

25

27

31

32

20

22

24

26

30

EAR

PANEL

AC

Line

Cord.

7.

Phono

Input.

AC

Outlets.

8.

Video

Sound

Input.

Speakers

A.

9.

CD

Input.

Speakers

B.

10.

Tape

Input/Output.

Antenna

Terminals.

11.

Soft

Clipping.

Phono

Ground.

12.

Speaker

tmpedance.

8 5

11

3

«12

4

2

BALIHIGH)

412

(NORMAL)

UNSWITCHED

250W

MAX

antewa

Liew

Lewd

UNSWITCHED

250W

MAX

“CAUTION

DO

NOT

OPEN

CAUTION

TO

REDUCE

THE

RISK

OF

ELECTRIC

SHOCK,

DO

NOT

REMOVE

COVER

(OR

BACK},

7

6

9

10

NO

SER-SERVICEABLE

1

PAATS

INSIDE,

REFER

SERVICING

TO

QUALIFIED

SERVICE

PERSONNEL

ONT

PANEL

Power.

7.

Tape

Monitor.

13.

Center-tune

indicator.

Phones.

8.

Input

Selector.

14,

FM

Stereo

Indicator.

Extra

Speakers.

9.

Mono.

15.

Tuning

Pre-sets.

Bass.

10.

Loudness

16.

Memory

Enter.

Treble.

11.

Volume.

17.

Search

Mode.

Balance.

12.

Tuning

Display.

18.

Up/Down

Tuning.

12

13

14

15

17

18

FM

STEREO.

CENTER

TUNE

<P)

>

VOLUME

(cara

TREBLE

BALANCE

EXTRA

s

SPEAKERS

O0e0

@MqQ

WO

(oom

[SS

LA

arma

cS,

Ae

Le

TAPE

MONO

LOUONESS.

WW

a

Specifications

NAD

7220PE

Stereo

Receiver

Note:

Specifications

are

measured

in

accordance

with

EIA

Standard

RS-

490

(IHF

A-202)

for

amplifiers

and

ANSI-IEEE

Standard

185

(1975),

i.e.

IHF

T-200,

for

tuners.

Amplifier

measurements

referred

to

8

ohms

are

taken

with

the

Speaker

Impedance

selector

set

to

8Q

(High).

Measurements

for

4

and

2

ohms

are

taken’with

Impedance

selector

at

4Q

(Normal).

Power

Amplifier

Section

CONTINUOUS

AVERAGE

POWER

OUTPUT

AT

8

OHMS

(minimum

RMS

power

per

channel,

both

channels

driven,

with

no

more

than

the

rated

distortion)

:

Rated

distortion

(THD),

20

Hz

-

20

kHz

Clipping

power,

1

kHz

(maximum

continuous

power

per

channel)

Dynamic

Headroom

at

8

ohms

Dynamic

power

(maximum

8

ohms

short-term

power

per

channel)

4ohms

2

ohms

Slew

factor

Slew

rate

Damping

factor

(ref.

8

ohms,

at

50

Hz)

T.H.D

and

SMPTE

I.M.

distortion

from

250

mW

to

rated

output

IHF

|.M.

(CCIF

IM)

and

T.I.M.

distortion

at

rated

output

Preamplifier

Section.

Phono

Input

Impedance

Input

Sensitivity

(1

kHz)

Signal-to-Noise

Ratio

with

cartridge

connected,

A-weighted

Input

Overload

at

20

H2z/1kHz/20kHz

RIAA

Accuracy

High-Level

Inputs

(CD,

Video,

Tape)

Input

impedance

Input

Sensitivity

Signal-to-Noise

ratio,

A-weighted

Input

Overload

Frequency

Response

infrasonic

Fitter

Controls

Treble

Bass

FM

Tuner

Section

Input

sensitivity

Mono,

-30

dB

THD+N

Mono,

50

dB

S/N

Stereo,

50

dB

S/N

Stereo

60

dB

S/N

20

W

(13

dBW)

0.04%

25

W

+4.4dB

55W

75W

85

W

>

50

15V/usec

>

30

<

0.04%

<

0.04%

R=47KQ

,

C=

100

pF

0.55

mV

for

1

W

out

2.4

mV

for

20

W

out

75

dB

re

5

mV

20/200/1700

mV

+0.5

dB

R=40kQ

,C

=

100

pF

33

mV

for

1W

out

150

mV

for

20W

out

84

dB

re

1

Wout

97

dB

re

20W

out

>10V

20Hz

-

20kHz

+0.5,

-1.0

dB

-3

dB

at

15

Hz

24

dB/octave

+7

dB

at

10kHz

+10

dB

at

50

Hz

10.8

dBf

(1.9

nV/3002

,

or

0.95

pV

into

75Q

)

14.4

dBf

(2.9

pn

V/3002

)

37

Bf

(40

pV)

47

dBf

(120

pV)

Capture

ratio

(at

45

and

65

dBf)

AM

rejection

(at

65

and

85

dBf)

Selectivity

Image

rejection

R.F.

intermodulation

LF.

rejection

SCA

rejection

Subcarrier

suppression

(19

&

38

kHz)

THD

at

100%

modulation

Mono,

1kHz

|

100Hz-6kHz

Stereo,

1

kHz

100Hz-6kHz,

Signal-to-noise

ratio

Mono

‘

IHF

weighted,

65

dBf

Stereo

Frequency

response,

30Hz-15

kHz

Stereo

separation

AM

Tuner

Section

Usable

sensitivity

THD

Selectivity

Image

rejection

LF.

rejection

SIN

ratio

(30%

mod.,

50

mV

input)

Physical

Specifications

Width

x

Depth

x

Height

Net

Weight

ShippingWeight

Power

Consumption

<

1.5

dB

>

60

dB

58

dB

70

dB

60

dB

90

dB

60

dB

60

dB

0.1%

0.2%

0.1%

0.3%

>

80

dB

>

74dB

+0.5

dB

45

dB

5yVv

0.5%

30

dB

45

dB

35

dB

45

dB

42

x

27.3

x

8cm.

6.5

x

103/4

x

334

in.

5.5kg

(12.1

lbs)

6.8

kg

(15

Ibs)

50/60

Hz

at

110,

120,

220,

or

240

VAC

150

W

Specifications

are

those

in

effect

at

the

time

of

printing.

NAD

reserves

the

right

to

change

Specifications

or

designs

at

any

time

without

notice.

Industrial

Design:

REINHOLD

WEISS

DESIGN/CHICAGO

ALIGNMENT

METHOD

AUDIO

SECTION

7220PE

IMPORTANT

Speaker

Impedance

switch

should

be

in

8

ohm

position

while

adjusting

center

volatge

and

idling

current.

INITIAL

ADJUSTMENT

(No

load

connected)

A.

CENTER

VOLTAGE

1,

Connect

DC

millivoltmeter

to

L

channe)

output

terminals.

2.

Turn

on

and

adjust

to

0

¥

+-

30mV

with

VR411

(100

ohm).

7

Connect

DC

millivoltmeter

to

R

channel

output

terminals

and

adjust

VR412

to

0

V

+-

30mv.

B.

IDLING

CURRENT

1.

Remove

solder

short

across

R455

and

R456.

2.

Connect

DC

millvoltmeter

across

P403,P404

(output

transistor's

collector

resistor)

and

adjust

R443

for

26-30mY

reading

on

meter.

Repeat

adjust

with

R444,

connecting

meter

across

P405,P406.

3.

Leave

power

on

for

minimum

5

minutes.

FINAL

ADJUSTMENT

C.

CENTER

VOLTAGE

1.

Repeat

step

A

above.

D.

IDLING

CURRENT

1.

Repeat

step

B

and

adjust

with

R443,

Rd

for

30mV

reading

on

meter.

2.

After

the

alignment

is

finished,

1

ohm

resistor

R455,R456

is

shorted

by

solder

short.

mo

CENTER

VOLTAGE

ADJ

RAa3

fOLING

CURRENT

Ao)

Mace

IDLING

CURRENT

ADJ

REZ

CENTER

VOLTAGE

AD}

AMPLIFIER

ADJUSTMENT

POINTS

--

5

--

FM

ALIGNMENTS

NECESSARY

INSTRUMENTATION

FM

GENERATOR

(less

than

0.05%

THD)

STEREO

GENERATOR

(less

than

0.058%

THD,

more

than

50

dB

separation

at

1

KHz.

AUDIO

GENERATOR

(not

necessary

if

FM

generator

has

built

in

sweep;

i.e.

SOUND

TECHNOLOGY

ST

1000A

and

ST

1020A)

2

AC

VIVM's

(or

one

with

left/right

channel

switch)

THD

ANALYZER

(resolution

better

than

0.1%)

OSCILLOSCOPE

(5m

or

better

sensitivity,

X

input

capability)

FREQUENCY

COUNTER

YOM

or

DMM

(high

impedance,

must

read

in

mV)

DIODE

DETECTOR

PROBE

COPPER/FERRITE

INDUCTOR

IMPORTANT

While

all

FM

generator

output

levels

hereafter

are

referred

to

the

300

ohm

input,

75

ohm

input

can

be

used,

but

be

aware

of

possible

equipment

groundloops

and

divide

the

RF

output

level

by

2.

Before

alignments

commence

set

input

selector

to

tuner

and

release

tape,

mono

and

FM

NR.

defeat

switches

(out)

ALIGNMENT

OF

FRONTEND

should

only

be

necessary

after

repair

to

frontend

or

crystal

oscillator

circuits

(pin

2

and

3

on

Q911)

A.

TUNING

VOLTAGE

(OSCILLATOR)

It

is

essential

to

check

tuning

voltage

before

aligning

the

rest

of

th

frontend,

1.

Connect

DMM

between

shield

and

5

on

frontend,

2.

Tune

to

108

MHz

and

adjust

L

101

if

voltage

is

incorrect.

SPECIFICATION

20.5V

+-

0.5V

-3,.

Tune

to

87.5

MHz

and

read

voltage,

repeat

step

2

and

3

if

incorrect.

SPECIFICATION

3V

+-

0.5¥

B.

RF

ADJUSTMENT

(TRACKING)

1,

Connect

RF

generator

to

antenna

input

and

detectorprobe

to

1,Q104

(IF

DETECTOR)

with

ground

to

detectorshield.

Adjust

sensitivity

of

oscilloscope

to

maximum

(SmV

or

better)

and

modulate

FM

generator

sweep

+-

300

KHz

or

more

WITH

modulating

(sweep)

signal

connected

to

X-imput

of

oscilloscope.

2.

Set

tuner

to 90

MHz,

enter

into

preset

1,

and

tune

generator

so

that

curve

appars

on

oscilloscope.

Turn

down

RF

input

level

so

that

curve

covers

approximately

1/2

of

oscilloscope

display.

J.

Check

alignments

of

L2-L

4-5

by

inserting

copper/ferrite

inductor

close

to

them

while

watching

curve

on

oscilloscope.

Curve

should

decrease

in

height

with

either

ferrite

(same

as

increasing

inductance,

i.e.

more

core)

or

with

copper

(same

as

decreasing

inductance,

i.e.

extend

size

of

coil),

If

curve

increases

in

size

more

than

10%

adjust

only

the

coil

which

reacts

incorrectly.

Adjust

coils

by

gently

extend

or

contract

the

aircoil

with

a

non-metallic

and

non-static

tool

(i.e.

plastic

knit-pin

or

a

wooden stick),

Be

careful

not

to

deform

coil,

4.

Set

tuner

to

105MHz,

enter

into

preset

2,

and

tune

generator

so

that

curve

appears

on

oscilloscope.

9.

Check

lL

2-14-45

again

with

the

ferrite/copper

inductor.

Curve

should

not

increase

more

than

10%

on

any

of

the

coils.

6.

Repeat

step

2+3+4+5

if

curve

height

is

outside

of

telerances,

if

necessary

distribute

the

error

between

90

and

105

KHz,

Check

tuning

voltage

again

if

tolerances

not

possible

to

achieve.

C.

IF

ADJUSTMENT

1.

Set

tuner

to

approximately

98

MHz

(the

tuner

must

be

tuned

to

an

unoccupied

frequency)

enter

into

preset

3,

and

tune

FM

generator

to

display

a

curve

on

the

oscilloscope.

2.

Adjust

11

(IFT

tuner

frontend)

to

maximum

and

symmetrical

curve

on

th

display,

using

as

little

input

signal

as

Possible,

D.

DETECTOR

COARSE

ADJUSTMENT

(OPTIONAL,NEEDED

ONLY

IF

DETECTOR

WAS

REPAIRED).

Reduce

sweep

modulation

level

to

+/-

75

kHz

and

set

input

level

to

300

uv.

Adjust

FA

generator

frquency

so

that

both

legs

of

the

inverted

U-shaped

curve

are

equally

high

on

the

display.

The

curve

should

be

almost

perfectly

symmetrical.

Disconnect

detectorprobe

from

tuner

and

oscilloscope.

Connect

either

of

the

tape

rec.

outputs

to

the

oscilloscope.

Adjust

I

102

primary

(closest

to

the

rear

of

unit)

to

maximum

curveheight

and

I

103

secondary

(closest

to

the

front

of

unit)

to

minimum

curveheight

and

straightest

possibe

line.

Go

back

and

forth

between

primary

and

secondary

till

both-are

peaked.

NOTE:

Both

the

cores

should

be

within

1.5

mm

from

the

top

of

the

form,

DETECTOR

ALIGNMENTS

(FINAL)

Disconnect

detectorprobe

and

connect

tape

rec.

outputs

to

VTVM's,

oscilloscope

and

distortion

analyzer.

Switch

stereo

generator

to

1

kHz

100X(+/-

75kHz)

mono

modulation

and

oscilloscope

to

normal

internal

sweep

0.2

mS

“and

0.5

V/cm

sensitivity.

Detector

reference

frequency

Reduce

FM

generator

output

level

while

monitoring

THD

from

left

channel.

When

THD

increases

to

3%,

fine

tune

the

FM

generator

frequency

to

minimum

THD,

Reduce

FM

generator

output

level

and

fine

tune

till

no

reduction

in

the

3%

THD

can

be

achieved

by

fine

tuning.

Use

this

frequency

for

all

the

following

detector,

MPX

and

FM

NR

adjustments.

NOTE:

The

typical

input

level

for

this

3%

THD

should

be

1.6

uv

to

2.3

uv.

This

is

done

only

to

“lineup”

the

NOTE:

1,

2.

frequency

from

the

generator

to

the

tuner’s

frequency.

If

IHF

usable

sensitivity

(-30

dB

THD+N=

3.16%

THD+N)

is

to

be

verified,

a

proper

IHF

bandpassfilter

must

be

used.

Connect

DMM

ACROSS

P112

(negative)

and

P113

(positive).

Set

FM

generator

output

level

to

1000

wv.

Adjust

I

102

primary

(closest

to

the

rear

of

unit)

for

0

V

on

DMM.

TOLERANCE

+/-

50

mV

Adjust

I

103

secondary

(closest

to

the

front

of

unit)

for

lowest

THD.

SPECIFICATION

less

than

0.1%.

Repeat

steps

5

-

7

till

no

further

improvements.

Record

the

DMM’s

final

reading

for

use

later

in

the

adjustment.

AUTOSEARCH

LEVEL

Connect

DMM

between

117

and

ground.

Increase

FM

generator

level

SET

TO

10

uY

and

adjust

R117

so

that

DMM

reading

goes

from

8.5

V

to

approximately

0.554

at

10

uv.

TOLERANCE

+/-0.15v

STEREO

DECODER,

MPX

FILTERS.

{.

VCO

Connect

a

frequency

counter

between

IC

6

11

and

ground.

Set

FM

generator

to

1000

uv

output

and

no

modulation,

Adjust

VR

3

for

a

19000

Hz

reading

on

the

counter.

TOLERANCE

+/-

100H2

Disconnect

frquency

counter

and

press

FM

NR.

defeat

switch

(inj.

Stereo

switch

threshold.

Modulate

FM

generator

1

kHz

45%

left

only plus

19

KHZ

PILOT

8

-

tOX.

Increase

FM

generator

level

upwards

from

0

and

adjust

VR

2

so

that

stereo

light

turns

on

and

audio

outputs

as

watched

on

VTVM

and

oscilloscope,

switches

to

one

channel

only

at

10

uv

input

level.

TOLERANCE

+5

uv

When

turning

input

level

down

the

unit

will

switch

into

mono

at

a

lower

level,

typically

5

-

7

u¥.

--

7

--

:

“Stero

separation

Set

FA

generator

output

to

1000

uv,

modulate

in

mono

only.

Adjust

VR

4

for

identical

outputs

in

the

two

channels,

TOLERANCE

+/-

20mV.

Modulate

FM

generator

left

channel

only

and

adjust

VR

§

for

minimum

on

right

channel

VTVM.

Modulate

FM

generator

right

channel

only

and

adjust

VR.5

for

minimum

on

left

channel

VTVM.

If

the

minimum

in

step

9

and

tO

are

different,

adjust

VR

5

so

that

the

readings

are

the

same

in

both

channels.

SPECIFICATION

better

than

40dB

separation

MPX

filter

Turn

off

audiomodulation,

leaving

pilot

tone

only.

Disable

IHF

filter

or

external

19

kHz

filter

if

used.

Adjust

LPF

1

left

channel

and

LPF

2

right

channel

for

minimum

output

SPECIFICATION

more

than

60

dB

suppression

--

8

--

AM

ALIGNMENTS

Unless

repairs

khave

been done

to

Oscillator

Section,

do

not

adjust

AM

OSC

coil

or

Trimming

Capacitor.

If

OSC

Adjustment

is

needed,

connect

hight

impedance

voltmeter

(preferably

DMM)

between

P123

and

ground.

A.

OSC

ADJUSTMENT

1.

Tune

unit

to

show

600KHz

on

display

and

adjust

L102

to

read

1.75V+-0.05V

on

DMM.

B.

IF

ADJUSTMENT

.

For

IF

adjustment

and

Tracaking

adjustment

connect

VTVM

to

loudspeaker

output

(or

tape

output),

only

one

channel

connection

needed,

and

connect

signal

generator

to

antenna

terminals.

Adjust

generator

for

30%

modulation

and

approx.

!v0

uv

input.

Tune

both

generator

and

receiver

to

approx.

{1000KHz,

and

adjust

generator

frequency

for

maximum

reading

on

VTVM.

Then

adjust

IFT2,

and

IFT3

for

maximum

reading

on

meter.

—

C.

TRACKING

ADJUSTMENT

{.

Tune

unit

and

generator

to

show

approx.

600KHz

and

adjust

L101

to

maximum

reading

on

VTVM.

2.

Tune

unit

and

generator

to

show

approx.

{400KHz

and

adjust

C138

(Trimming

Capacitor)

for

maximum

reading

on

VTVM.

3,

Repeat

step

1

and

2

unit

no

fkurhter

imprivement.

--

9

--

TUNER

ADJUSTMENT

POINTS

AM

TRACKING

ADJ.

It

IF

AM_

TRACKING

ADJ.

L2

RF1

L4

RF2

LS

MIX

AM_OSC_ADJ.

L8

OSC

FM

DET

PRIMARY

AM

_IF

ADJ.

FM

DET

SECONDARY

AM

LED

SENS.

ADJ.

FM

MPX

FILTER

ADJ.

FM

AUTO

SEARCH

FM

MPX

FILTER

ADJ.

STEREO

SEPARATION

SYNTHESIZER

FREQ.

For

versions

A,

Al. F

ions

B,

Bl,

C,-Cl.

AMPLIFIER

PCB

LAYOUT

AND

WIRING

DIAGRAM

an

oe

a

ee

meee

YEL

UNSWITCHED

S

oo

'

VIO

BROWN

P122

TO

TUNER

PCB

P12)

P120

ttt

|

P.T

ie

(120v)

RED

=

N

sJo

3a

sf

N

(120V)

RED

PHONES

7

POWER

SW

P126

weoncewee

te

ORG

:

SPEAKERS

PHONES

POWER

SW

OWER

TO

TUNER

PCB

A,

16

Siig

RED

a,

NAD 7220PE Manuale utente

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