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SERVICE

MANUAL

AM/FM

STEREO

RECEIVER

NAD

7155

SERVICE

MANUAL

NOTE:

This

manual

covers

all

versions.

A:

U.S.A.

Al:

Canada

B:

U.K,

B1:

Australia

C:

EUROPE

and

others

C1:

W-Germany

TABLE

OF

CONTENTS

LOCATION

MAP

SPECIFICATION

INTERNAL

VIEW

SUGGESTED

INSTRUMENTATION

HOOKUP

FM

ALIGNMENTS

AM

ALIGNMENTS

AMPLIFIER

ALIGNMENTS

AMPLIFIER

P.C.B.

LAYOUT

DIAGRAM

SCHEMATIC

DIAGRAM

(AMPLIFIER

SECTION)

TUNER

P.C.B.

LAYOUT

DIAGRAM

SCHEMATIC

DIAGRAM

(TUNER

SECTION)

WIRING

DIAGRAM

EXPLODED

VIEW

PARTS

LIST

EXPLODED

VIEW

ELECTRICAL

PARTS

LIST

PAGE

REAR

PANEL

1.

AC

Line

Cord.

9.

Phono

Input.

|

2.

AC

Convenience

Outlets

10.

Phono

Capacitance.

(Not

in

European

models)

11.

CD/Aux

Input.

3.

Speakers

A.

12,

Tape

1

Rec/Play.

4.

Speakers

B.

13,

Tape

2

Rec/Play.

5.

Antenna

Terminals.

14,

Preamp

Out,

Main

In

6.

AM

Rod

Antenna.

15.

Soft

Clipping.

7.

Phono

Ground.

16.

Speaker

Impedance.

8.

MM/MC.

17.

Bridging.

6 7 5

NADELECTRONICS,

INC.

TOSIONLONBONITONS

le

|

-

3

RS

;

DNS@El

Ae

od

ba

:

A

CAUTION

|

A

as]

FRONT

PANEL

1,

Power.

Phones.

Speaker

Selector.

Bass.

Treble.

Bass

EQ.

Infrasonic

Filter

Defeat.

.

Mono.

.

Dyn

Sep

Defeat.

10.

Recording

Input

Selector.

11.

Listen

Input

Selector.

‘Service

PERSONNEL

12,

Low

Level.

43.

Loudness

Compensation.

14.

Volume/Balance.

15.

Tuning

Display.

16.

Status

Indicators.

17.

Pre-sets.

18.

Enter.

19.

AM/FM

20.

Up/Down

Tuning.

21.

Search.

1

"|

stereo

Receves

7158

SH

=

ES

tetaesa

?

tt

ane

.

oa

ooo]

12

13

SPECIFICATIONS

NOTE:

Measurements

referenced

to

8

ohms

are

taken

with

the

Speaker

Impedance

Selector

set

to

“8

ohm

(High).

Measurements

for

4

and

2

ohms

are

taken

with

the

impedance

selector

at

‘4

ohm

(Normal)’’.

Specifications

are

measured

in

accordance

with

EIA

Standard

RS-490

(IHF

A-202)

for

amplifiers

and

ANSI-IEEE

Standard

185

(1975)

(IHF

T-200)

for

tuners,

Tuner

sensitivity

is

measured

via

75

ohm

coaxial

input

and

converted

to

equivalent

300

ohm

values.

Power

Amplifier

Section,

Stereo

Mode

CONTINUOUS

AVERAGE

POWER

OUTPUT

INTO

8

OHMS

(min.

RMS

power

per

channel

into

8

ohms,

20

Hz

-

20

kHz,

both

channels

driven,

with

no

more

than

the

rated

distortion).

Rated

distortion

(THD),

20

Hz

-

20

kHz.

Clipping

power

(max.

continuous

power

per

channel).

8

ohms:

4

ohms:

IHF

dynamic

headroom

at

8

ohms.

IHF

dynamic

power

(max.

short-term

power

per

channel).

8

ohms:

4

ohm:

2

ohms:

Slew

factor.

Slew

rate.

Damping

factor

(ref.

8

ohms,

at

50

Hz).

Input

impedance.

Input

sensitivity

for

1

W/55

W

out.

Power

amp.

gain.

THD

(Total

Harmonic

Distortion,

20

Hz

-

20

kHz,

from

250

mW

to

rated

output).

SMPTE

I.M.

(Intermodulation

Distortion

60

Hz

:

7

kHz,

4:1,

from

250

mW

to

rated

output).

IHF

I.M.

(CCIR

IM

Distortion,

19

to

20

kHz

at

rated

output).

Bridged

(Monophonic)

Mode

CONTINUOUS

AVERAGE

POWER

OUTPUT

INTO

8

OHMS

(min.

RMS

power

into

8

ohms,

20 Hz

-

20

kHz,

with

no

more

than

the

rated

distortion).

IHF

Dynamic

Headroom

at

8

ohms.

Dynamic

power

(max.

short-term

output,

8

ohms).

All

versions

except

USA.

55

W

(17.4

dBW)

0.03

%

65W

75

W

+2.6dB

100

W

100

W

130

W

>

50

20

V/usec.

>

50

22

k

ohms.

0.13

V/0.95

V

26.8

dB.

<

0.03

%

<

0.03

%

<0.03

%

125

W

(21

dBW)

+2.5dB

250

W

USA

version

only.

55

W

(17.4

dBW)

0.03

%

75W

90W

+3dB

110

W

130

W

150

W

150

W

(22

dBW)

Preamplifier

Section

Phono

Input

Input

impedance,

Input

sensitivity

(1

kHz),

Input

overload

at

20

Hz/1

kHz/20

kHz.

THD

(20

Hz

-

20

kHz)

and

IM

Dist.

at

+30

dB

level.

RIAA

response

accuracy.

S/N

ratio,

IHF

A-weighted,

with

cartridge

connected.

Line

Level

Inputs (Aux.,

Tape)

Input

Impedance.

Input

sensitivity.

Maximum

input

signal.

Signal

to

noise

ratio,

A-weighted.

Frequency

response,

20

Hz

-

20

kHz.

Outputs

Preamp

output

impedance.

Maximum

output

level.

Tape

output

impedance.

Tape

output

infrasonic

filter.

Controls

Treble.

Bass,

Speaker

equalization.

Infrasonic

filter.

Audio

muting

(low

level).

MM:

Mc:

MM:

MC:

MM:

Mc:

MM:

MC:

R

47k

ohms

C

100/200/320

pF

R

100

ohms

C

1000

pF

0.33

mV

for

1

W

out.

2.5

mV

for

55

W

out.

0.02

mV

for

1

W

out.

0.15

mV

for

55

W

out.

27

mV/230

mV/2

V.

1.2

mV/12 mV/88

mV.

<0.04

%

+0.5

dB.

80

dB

re

5

mV.

80

dB

re

0.5

mV.

R

10kohms;C

220

pF.

20

mV

for

1

W

out.

150

mV

for

55

W

out.

>10V

88

dB

re

1

W.

103

dB

re

55 W.

+0.5

dB.

800

ohms.

10

Vv.

1000

ohms

(buffered).

—3dB

at

15

Hz,

12

dB/octave.

+7

dB

at

10

kHz.

+7

dB

at

100

Hz.

+3

dB

at

70

Hz.

+6

dB

at

32

Hz.

—

3B

at

15

Hz,

12

dB/octave.

—

20

4B.

EM

Tuner

Section

Input

sensitivity

Mono,

—30

dB

THD

+N:

Capture

ratio

at

25,

45

&

65

dBf.

AM

rejection.

Selectivity,

Image

rejection.

R.

F.

intermodulation.

|.

F,

rejection.

SCA

rejection.

Subcarrier

suppression

(19

+

38

kHz).

THD

at

100

%

modulation,

Signal

to

noise

ratio,

A-weighted,

65

dBf.

Frequency

response,

30

-

15

kHz.

Stereo

separation

(Dyn

Sep

off),

AM

Tuner

Section

Usable

sensitivity.

Selectivity.

Image

rejection.

|,

F,

rejection.

Physical

Specifications

Dimensions

(width

x

height

x

depth).

Net

weight.

Shipping

weight.

Power

consumption.

Mono,

50

dB

S/N:

Stereo,

50

dB

S/N:

Stereo,

60

dB

S/N:

Alternate

channel:

Adjacent

channel:

Mono:

Stereo:

Mono:

Stereo:

1

kHz:

30

Hz

-

10

kHz:

50

usec.

deemphasis

75

psec.

10.3

dBf.

9.8

dBf.

(1.8

#V/300

ohms)

(1.7

#V/300

ohms)

15.8

dBf.

13.2

dBf.

(3.2

nV)

(2.5

uv)

33.2

dB.

32

dBf.

(25

nV)

(22

uv)

43.1

dBf.

42

dBf.

(78

nV)

(70

pv)

<1,.5

dB.

>

65

dB.

70

GB.

8

dB.

85

dB.

70

dB.

90

GB.

70

dB.

60

dB.

1

kHz

100

Hz

-

6

kHz

0,09

%

0.2%

0,09

%

0.3%

82

dB.

75

dB.

(typ.

80 dB

at

75

dBf)

+0.5

dB.

50

dB.

40

dB.

300

uV/meter.

35

dB.

50

dB.

50

dB.

42

x

10.8

x

38

cm.

16.5

x

4.25

x

15

in.

9.18

Kg./20

Ib,

4

oz.

10.6

Kg./23

Ib.

6

oz.

50/60

Hz

at

110,

120,

220

or

240

VAC.

340

W.

INTERNAL

VIEW

SUGGESTED

INSTRUMENTATION

HOOKUP

fi

seg

es

ap

ee

ae

oe

A

oe

ey

NP

ag

eh

oe)

2

a]

'

OSCILLOSCOPE

FM

GENERATOR

AUDIO

OSC

|

i

|

1

\

1

IN

(0)

|

3

I

l

i

H

vINeUT—XINPUT

EXT.

MOD.

ag

q

eeoons

i

aes

|

\

1 1

t

USE

ONLY

IF

FM

GENERATOR

WITH

BUILT-IN

SWEEP

UNAVAILABLE

:

OSCILLOSCOPE

FM

GENERATOR

WITH

BUILT-IN

SWEEP

Rd

IE:

ST

10008

SWEEP

Y

INPUT

X

INPUT

[OUTPUT

RF

OUT.

VERT.

HORIZ,

$

¢

°

DETECTOR

PROBE

BALUN

AC.

VTVM

esa

fas

ee

cere

he

PIN1

IC

102

3000

UNIT

UNDER

TEST

AC

VTVM

INPUT

FROM

TUNER

IC:

TO

PIN1

Ic

102

TO

TUNER

GND.

AT

FRONTEND

out

TO

SCOPE

DISTORTION

METER

DISTORTION

PUT

Out

ry

PUT

Diodes

should

be

point-contact

germanium;

Some

commonly

available

types

are:

PICTORIAL

DIAGRAM

OF

DETECTOR

PROBE

RY

c2

CENTER

LEAD

TO

SCOPE

\

SHIELD

Keep

leads

as

shortas

minimize

stray

signal

0a80

OA81

AAIIS

1N60

1N34

1N22

possible,

to

pickup.

FM

ALIGNMENTS

NECESSARY

INSTRUMENTATION

FM

GENERATOR

(less

than

0.05%

THD)

STEREO

GENERATOR

(less

than

0.05%

THD,

more

than

50

dB

sep.)

AUDIO

GENERATOR

(not

necessary

if

FM

generator

has

built

in

sweep;

ie,

SOUND

TECHNOLOGY

ST

1000A

and

ST

1020A)

AC

VTVM's

(or

one

with

a

left/right

switch)-

THD

ANALYZER

(resolution

less

than

0.1%)

OSCILLOSCOPE

(5mV

or

better

sensitivity,

X

input

capability)

FREQUENCY

COUNTER

VOM

or

DMM

(high

impedance,

must

read

in

mV)

DETECTOR

PROBE

IMPORTANT

FRONTEND

oa

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

levels

by

2.

Before

alignments

commence

set

input

selector

and

record

selector

to

tuner

and

release

mono

dyn

sep

defeat

switches

(out).

Alignment

of

frontend

should

only

be

necessary

after

repair

to

frontend

or

crystal

oscillator

circuits

(pin

2

and

3

on

IC

110).

TUNING

VOLTAGE

(OSCILLATOR)

It

is

essential

to

check

tuning

voltage

before

aligning

the

rest

of

the

frontend.

Connect

DMM

between

ground

and

TP

102.

Tune

to

108

MHz

and

adjust

C

20

if

voltage

is

incorrect.

SPECIFICATION

24.7V

+

0.5V

Tune

to

88

MHz

and

read

voltage.

Adjust

L

6

if

voltage

is

incorrect.

SPECIFICATION

3.6V

+

0.5V>

Repeat

step

2

and

3

until

readings

are

within

tolerances.

RF

ADJUSTMENT

(TRACKING)

Connect

RF

generator

to

300

ohm

antenna

input

and

detectorprobe

to

pin

1

IC

102

with

ground

to

tunershield.

Adjust

sensitivity

of

oscilloscope

to

maximum

(SmV

or

better)

and

modulate

FM

generator

sweep

*

300

kHz

or

more.

Set

tuner

to

105

MHz,

enter

into

preset

5,

and

tune

generator

so

that

curve

appears

on

oscilloscope.

Turn

down

RF

input

level

so

that

curve

covers

approximately

1/2

of

oscilloscope

display.

Adjust

C

3,C

9,

C

11

and

C

15

to

maximum

curve

height

while

reducing

RF

input

to

keep

entire

curve

on

display.

Set

tuner

to

90

MHz,

enter

into

preset

1,

and

tune

generator

so

that

curve

appears

on

oscilloscope

display.

Adjust

L

1,

L

2,

L3

and

L

4

to

maximum

curve

height.

Repeat

steps

2,

3,

4

and

5

(use

preset

1

and

5)

until

both

frequencies

are

at

maximum

curve

height.

NOTE:

105

MHz

curveheight

is

typically

slightly

stronger

than

90

MHz.

IF

ADJUSTMENT

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

oscilloscope.

Adjust

L

5

and

L

101

to

maximum

and

symmetrical

curve

on

the

display,

using

as

little

input

as

Possible.

NOTE:

Maximum

input

500

yV,

typical

curveheight

4

mV

at

150

uV

and

15

mV

at

300

nV.

|

i

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

FM

generator

frequency

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

1

rec.

outputs

to

the

oscilloscope.

The

oscilloscope

should

now

display

a

diagonal

line.

Adjust

L

102

primary

(closest

to

IC

102)

to

maxi-

mum

curveheight

and

L

102

secondary

to

minimum

curve

height

and

straightest

possible

line.

Go

back

and

forth

between

primary

and

secondary

till

both

are

peaked.

NOTE:

Both

the

cores

should

be

within

1.5mm

from

the

top

of

the

form.

DETECTOR

ALIGNMENT

(FINAL)

Disconnect

detectorprobe

and

connect

tape

1

rec.

output

to

VTVM’s,

oscilloscope

and

distortion

analyzer.

Switch

stereo

generator

to

1

kHz

100%

(+

75

kHz)

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

follow-

ing

detector,

MPX

and

DYN

SEP

adjustments.

NOTE:

The

typical

input

level

for

this

3%

THD

should

be

1.6

pV

to

2.3

KV.

This

is

done

only

to

“line

up”

the

frequency

from

the

generator

to

the

tuner’s

frequency.

lf

IHF

usable

sensitivity

(-30

dB

THD

+

N

=

3.16%)

is

to

be

verified,

a

proper

IHF

bandpass-

filter

must

be

used.

Connect

DMM

across

TP

104

(negative)

and

TP

105

(positive).

Set

FM

generator

output

to

1000

uV

Adjust

L

102

primary

(closest

to

IC

102)

for

0

V

on

DMM.

TOLERANCE

+50

mv

Adjust

L

102

secondary

for

lowest

THD.

SPECIFICATION

less

than

0.1%

Repeat

steps

3,

5

and

6

till

no

further

improvements.

Record

the

DMM's

final

reading

for

use

later

in

the

adjustments.

(1

—

3)

AUTOSEARCH

LEVEL

Connect

DMM

between

ground

and

TP

107,

Increase

FM

generator

level

upwards

from

0

and

adjust

R

107

“MUTE”

so

that

DMM

reading

goes

from

0

V

to

approximately

4.8

V

at

10

uV

input.

TOLERANCE

£2uv

STEREO

DECODER,

MPX

FILTERS.

vco.

Connect

a

frequency

counter

and

a

200

k

ohm

resistor

in

parallel

between

ground

and

TP

108.

Set

FM

generator

to

1000

uV

output

and

no

modulation.

Adjust

R

164

“MPX

VCO”

for

a

19000

Hz

reading

on

the

counter.

TOLERANCE

+100

Hz

Disconnect

frequency

counter

and

resistor

and

depress

DYN

SEP

defeat

switch

(in).

Stereo switch

threshold.

Modulate

FM

generator

1

kHz

100%

left

only

plus

19

kHz

pilot

8

-

10%.

6

14

Increase

FM

generator

level

upwards

from

0

and

adjust

R

167

“ST

SW”

so

that

stereo

light

turns

on

and

audio

outputs,

as

watched

on

VTVM’s

and

oscilloscope,

switches

to

one

channel

only

at

10

uV

input

level.

TOLERANCE

+5

uv

NOTE:

When

turning

input

level

down

the

unit

will

switch

into

mono

at

a

lower

level,

typically

7

uV.

Stereo

separation.

Set

FM

generator

output

to

1000

uV,

modulate

left

channel

only.

Adjust

R

158

for

minimum

on

right

channel

VTVM.

Modulate

FM

generator

right

channel

only

and

adjust

R

158

for

minimum

on

left

channel

VTVM.

If

the

minimum

in

step

8

and

9

are

different,

adjust

R

158

so

that

the

readings

are

the

same

in

both

channels.

SPECIFICATION

better

than

50

dB

separation

MPX

filter

Turn

off

audiomodulation,

leaving

pilot

tone

only.

Disable

IHF

filter,

or

external

19

kHz

filter.

Check

19/38

kHz

suppression.

SPECIFICATION

more

than

60

dB

If

unit

does

not

meet

specification

adjust

FL

102

“MPX

FILTER”

on

left

channel

and

FL

103

“MPX

FILTER”

on

right

channel

to

minimum

output.

NOTE:

DO

NOT

ADJUST

THE

MPX

FILTERS

UNLESS

NECESSARY,

the

cores

are

brittle

and

break

easily.

Release

the

DYN

SEP

DEFEAT

switch

(out).

DYN

SEP

ADJUSTMENTS.

Turn

R

256

“DYN

SEP

OFF”,

R

249

and

250

“DYN

SEP”

fully

clockwise.

DYN

SEP

separation

effect.

Observe

output

from

left

channel

with

FM

generator

output

level

1000

nV

and

modulated

1

kHz

left

channel

only.

Reduce

audiomodulation

only

from

stereo

generator

so

that

left

channel

output

is

reduced

by

6

dB

(50%

stereo

modulation).

The

19

kHz

pilot

signal

MUST

REMAIN

modulated

8

-

10%.

Set

FM

generator

output

to

50

nV

and

adjust

R

249

“DYN

SEP”

for

—30

dB

separation

left

to

right

channel.

TOLERANCE

+2dB

Switch

modulation

to

right

channel

only

while

maintaining

the

same

modulation

levels:

Adjust

R

250

“DYN

SEP”

for

—30

dB

separation

right

to

left

channel.

TOLERANCE

+2dB

DYN

SEP

auto

defeat

level.

Set

generator

output

to

200

uV

and

adjust

R

256

“DYN

SEP

OFF”

so

that

separation

starts

increasing

when

watching

left

channel

VTVM.

Adjust

FM

generator

output

up

and

down

around

200

uV

and

make

sure

switching

occurs

around

200

HV.

TOLERANCE

+100

nV

—

30

nV

SYNTHESIZER

FREQUENCY

Tune

to

a

known

accurate

frequency

source,

i.e.,

broadcasting

station

or

synthesized/digital

display

FM

generator

preferably

in

the

midband

95

-

100

MHz.

Connect

DMM

across

TP

104

(negative)

and

TP

105

(positive).

Adjust

C

209

“FQ”

so

that

DMM

reads

the

same

as

recorded

in

E

—

7.

TOLERANCE

+10mV

R167

TP108

AM

ALIGNMENTS

A

wn

aR

won

OSCILLATOR.

Connect

DMM

to

TP

101

and

gnd.

Tune

to

1710

kHz,

Enter

into

preset

1.

Adjust

C

148

for

reading

of

31

+

0.5VDC,

Tune

to

520

kHz.

Enter

into

preset

2.

Adjust

L

103

for

reading

of

1.8

+

0.1

VDC.

Repeat

steps

2

and

3

until

within

tolerances.

ANTENNA,

IF

Swing

antenna

away

from

chassis

and

peel

back

label

(if

present)

to

expose

adjustment

tab.

Connect

DC

voltmeter

to

centertap,

R

208

and

gnd.

Tune

to

station

of

moderate

strength,

near

600

kHz.

Enter

into

preset

3.

Adjust

L

951

(move

tab

under

label

on

antenna)

for

maximum

reading

on

meter.

(Use

non-ineractive

tool,

such

as

plastic

or

wooden

stick.)

Adjust

L

104 and

L

106

for

maximum

reading

on

meter.

Tune

station

of

moderate

strength

near

1400

kHz.

Enter

into

preset

4.

Adjust

C

147

for

maximum

reading

on

meter.

Repeat

steps

3

and

5

until

no

further

improvement

is

seen.

9

kHz,

10

kHz

WHISTLE

FILTERS

Tune

to

quiet

spot

on

the

dial

(a

clear

frequency)

Connect

audio

osc.

to

base,

Q

117

(isolate

with

0.1

-

1.0

uF

capa.)

Connect

AC

VTVM

(or

scope)

to

TP

103.

Set

audio

osc.

to

10

kHz

(+

50

Hz)

1

V.

Adjust

FL

104

for

minimum

meter

reading.

Set

audio

osc.

to

9

kHz

(+

50

Hz)

1

V.

Adjust

FL

105

for

minimum

meter

reading.

SIGNAL

METER,

AUTO

STOP

R

208

controls

signal

strength

indication

and

auto

stop

level,

adjust

only

if

necessary,

to

correct

for

scan

stopping

on

excessively

weak

signals,

or

failure

to

stop

on

moderately

strong

ones.

NOTE:

When

finished,

lock

antenna

bar

adjustment

with

laquer

(nail

polish),

re-install

label.

12

TP101