NAD 1700 User manual

Table of contents

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SERVICE

|

|

NAO

MANUAL

MONITOR

SERIES

1700

PREAMPLIFIER/

TUNER

—

NAD

1700

SERVICE

MANUAL

NOTE:

This

manual

covers

all

versions.

A:

U.S.A.

A1:

Canada

B:

U.K.

B1:

Australia

C:

EUROPE

and

others

C1:

W-Germany

Page

Contents

3

Rear/Front

View

4-6

Specifications

6

Safety

Notice

7

Suggested

Equipment

Hookup

8-10

FM

Alignment

11

AM

Alignment

12

Preamp

Adjustment

13-14

Wiring

Diagram

15-16

Preamp

PCB

Layout

17-18

Preamp

Schematic

Diagram

19-20

Tuner

PCB

Layout

21-22

Tuner

Schematic

Diagram

23-28

Electrical

Parts

List

29-30

Exploded

Parts

List

31

Exploded

View

REAR

PANEL

|

CAUTION

|

RISK

OF

ELECTRIC

SHOCK

1.

AC

Line

Cord.

9.

Video

Sound

Input.

DO

NOT

OPEN

2.

AC

Outlets

(not

in

U.K.

model).

10.

CD

Input.

CAUTION:

TO

REDUCE

3.

AM

Antenna

Terminals.

11.

Tape

1

Input/Output.

SHOCK

DO

NOT

REMOVE

4.

FM

Antenna

Input.

12.

Tape

2

Input/Output.

eee

ee

CABLE

5.

AM

Rod

Antenna.

13.

Output

(Normal).

Sea

ee

RIED

6.

Phono

Ground.

14.

Output

(High).

SERVICE

PERSONNEL

7.

Phono

Input.

15.

EPL

(External

Processor)

Input/Output.

8.

MM/MC.

16.

Infrasonic

Filter

On/Off.

==

im

AM

ANTENNA.

J

switcren

PHONO

:

TAPE

1

TAPE

2

OUTPUT

EPL

GROUND

ghhoNe

[VIDEO

CD

IN

OUT

IN

OUTNORMAL.HIGH

IN

OUT

|

J

swircrten

4

INFRA

©

wcnm

OFF

ON

I

swicueo

i

ii

qh

)

UNSWITCHED

J

6

7

8 $

10

11

12

3

14

15

16

1

2

FRONT

PANEL

1,

Power.

8.

Tone

Control

Bypass.

15.

Balance.

22.

AM/FM.

b

2.

Phones.

9.

Treble.

16.

Volume.

23,

Mono.

3.

Phase

Invert.

10.

Treble

Range.

17.

Tuning.

24.

Memory

Enter.

4.

EPL

(External

Processor

Loop).

11.

Tape

Copy.

18.

Tuning

Display.

25.

Bank

Selector.

5.

Bass

EQ.

12.

Tape

Monitor

1

and

2.

19.

Status

Indicators.

26.

Pre-sets.

6.

Bass

Range.

13.

Input

Selector.

20.

FM

NR

Off.

7,

Bass.

14.

Low

Level.

21.

IF

Narrow.

1

26 25

24 23

22

21

20

19

18

17

el

_—

|

ASE

INVERT

NA

lonitor

Series

Preamp

Junet

170¢

:

TUNING

STEREO

Vv

A

5

3 4

BANK

ENTER

MQNO

A

IF

NARROW

GY.

1a

d

566666668

0|©

©

6/0

0

Boone

FM

NR

OFF

— =

PHONES

VERT

EPL

ro

m2.

oa

s'

ey

ee

ul

aie

2

TAPE,

pHOND

cD

LEVEL

pris

perme

ne

rele

=

——

—

——J

|

=

SPECIFICATIONS

Tuner

specifications

are

measured

in

accordance

with

ANSI-IEEE

Standard

185

(1975),

i.e.

IHF

T-200.

FM

sensitivity

is

measured

via

75-ohm

coaxial

input

and

expressed

in

nominally

equivalent

300-ohm

values.

All

measurements

taken

in

Normal

|.F.

mode

except

where

specified.

Preamp

specifications

are

measured

in

accordance

with

EIA

Standard

RS-490

(formerly

IHF

A-202)

and

are

referenced

to

the

NORMAL

output.

Signal

levels

are

6.dB

higher

at

the

HIGH

output;

divide

input

sensitivity

values

by

2.

PREAMPLIFIER

SECTION

PHONO

INPUT

Input

Impedance

(MM

or

MC)

R

=

47K

ohms,

C

=

120

pF

Input

Sensitivity

MM

1.4mV

(1

kHz,

0.5V

out)

MC

100

uV

Input

Overload

at

MM

20/180/1500

mV

20H2/1kHz/30kHz

Mc

1.5/13/110

mV

Signal/Noise

ratio,

IHF

A—

MM

76

dB

re5mvV

weighted,

with

cartridge

connected

MC

76

dB

re

0.5

mV

THD

(20

Hz—

20

kHz)

and

IM

<0,04%

Distortion

at

+

30

dB

level

RIAA

response

accuracy

+0.5

dB

LINE

LEVEL

INPUTS

(CD,

VIDEO,

TAPE,

EPL)

Input

Impedance

R

=

100KQ,

C

=

220pF

input

Sensitivity

80

mV

for

0.5

V

out

Maximum

Input

Signal

10V

Signal/Noise

ratio,

A-weighted

>

100

dB

re

0.5

V

out

>110dBre2V

Frequency

Response

20Hz

—

20kHz

+0.3

dB

OUTPUTS

Output

Impedance

.

Tape

or

EPL

1000

ohms

Normal

600

ohms

Phones

&

High

150

ohms

(will

drive

all

headphone

impedances)

Maximum

Output

Level

12

V

(all

outputs)

Tape

Output

Infrasonic

Filter

—3

dB

at

14

Hz,

12

dB/octave

CONTROLS

Treble

Bass

Bass

Equalization

Infrasonic

Filter

(switchable)

TUNER

SECTION

FM

SECTION

Input

Sensitivity

Mono,

—30

dB

THD

+N

Mono,

50dB

S/N

|

Stereo,

50

dB

S/N

FM

NR

on:

FM

NR

off:

Stereo,

60

dB

S/N

FM

NRon:

FM

NR

off:

Capture

Ratio

AM

rejection

Selectivity

(Normal

|.F.)

Selectivity

(Narrow

IF.)

Image

rejection

R.F.

intermodulation

l.F.

rejection

SCA

rejection:

Subcarrier

suppression:

THD

at

100%

modulation

Signal-to-noise

ratio,

IHF

weighted

Frequency

response

Stereo

separation

(FM

NR

off)

dBf

10.3

dBf

13

dBf

25

dBf

35

dBf

35

dBf

45

dBf

Mono:

Stereo:

Mono:

Stereo:

+12

dB

at

3,

6,

or

12

kHz

+12

dB

at

50,

120,

or

250

Hz

+3

dB

at

60

Hz

+6

dB

at

36

Hz

—3

dB

at

14Hz,

12

dB/octave

uV/750hms

—

uV/300

ohms

0.9

uV

.

1.8uv

1.2uV

2.4uV

5uV

10

uV

15uV

30

uV

15

uV

32

uV

50

uV

100

uV

<1.5dBfrom

45

to

85

dBf

>65

dB

at

45

and

85

dBf

75

dB

alternate

channel

7

dB

adjacent

channel

85

dB

alternate

channel

20

dB

adjacent

channel

>90

dB

>65

dB

_

>100dB

'>70

dB

>60

dB

(19

+

38

kHz)

1kHz

100Hz—6kHz

0.08%

0.2%

0.08%

0.3%

.

>82

dB

78

dB

at

65

dBf,

80

dB

at

85

dBf

-

30

Hz—

15

kHz

+0.5

dB

50

dB

at

1

kHz

By

40

dB

from

30

Hz

to

10

kHz

AM

SECTION

Usable

sensitivity

Selectivity

Image

rejection

|.F.

rejection

S/N

ratio

THD

PHYSICAL

SPECIFICATIONS

Width

x

Height

x

Depth

Net

Weight

Shipping

Weight

Power

Requirement

300

uV/meter

35

dB

50

dB

50

dB

45

dB

(30%

mod.,

50

mV

input)

0.5%

43.5

x

12

x

29.3

cm

(17.1

x

4.75

x

11.5

in.)

6.6

kg

(14.5

Ibs)

7.6

kg

(16.7

Ibs)

50/60

Hz

at

110,

120.

220

or

240

VAC

30

W

NOTE

:

NAD

reserves

the

right

to

change

specifications

or

designs

at

any

time

without

notice.

All

specifications

are

those

in

effect

at

the

time

of

printing.

SERVICE

SAFETY

PRECAUTIONS

(UL)

1.

Use

exact

replacement

parts

for

critical

locations,

marked

“A”

on

parts

list.

2.

Return

lead

dress

to

original

position,

and

re-install

protective

covers.

3.

Before

returning

to

customer,

test

for

shock

hazard;

use

either

method

A

or

B:

A.

Leakage

test,

“cold”:

1.

Unplug

AC

cord,

turn

power

switch

ON.

2.

Connect

one

lead

of

High

Voltage

Insulation

Tester

to

both

prongs

of

AC

plug.

3.

Touch

other

lead

to

all

exposed

metal

parts.

4.

Impedance

measurement

must

be

0.3

-

5.0

Megohms.

B.

Leakage

test,

“live”:

;

1.

Plug

unit

directly

into

AC

outlet;

do

not

use

isolation

transformer.

2.

Connect

one

lead

of

Leakage

Current

Tester

to

earth

ground.

3.

Touch

other

lead

to

all

exposed

metal

parts.

4.

Leakage

measurement

must

be

less

than

0.5

milliamps.

SUGGESTED

INSTRUMENTATION

HOOKUP

—

FM

ALIGNMENT

WITH

BUILT~IN

SWEEP

1E:

ST

1000A

SEEECE

FREQ.

COUNTER

(IF

NOT

USING

SYNTHESIZED

FM

GENERATOR)

DUMMY

ANTENNA

750

DISTORTION

METER

ee

DISTORTION

OUTPUT

INPUT

SCHEMATIC

DIAGRAM

OF

DETECTOR

PROBE

C1

02

330p

Diodes

should

be

point-contact

FROM

OUT

germanium;

Some

commonly

TUNER

Ico

|

TOSCOPE

available

types

are:

OA80

OA81

AA119

1N60

1N34

1N22

PICTORIAL

DIAGRAM

OF

DETECTOR

PROBE

R1

CENTER

LEAD

TO

PIN1

TO

SCOPE

{C103

Keep

jeads

as

shortas

possible,

to

TO

TUNER

GND.

\.

SHIELD

minimize

stray

signal

pickup.

AT

FRONTEND

FM

ALIGNMENTS

NECESSARY

INSTRUMENTATION

e

Stereo

Modulator

(less

than

0.05%

THD,

more

than

50dB

Sep.)

@

FM

Generator

(less

than

0.05%

THD)

e

75

ohm

Dummy

Antenna

(if

needed

by

generator)

®

Audio

Oscillator

(not

necessary

if

FM

Generator

has

built-in

sweep,

e.g.,

SOUND

TECHNOLOGY

ST

1000A

or

ST

1020A)

@

2

AC

VTVM's

(or

one

with

a

Left/Right

switch)

@

THD

Analyzer

(resolution

less

than

0.1%)

®

Oscilloscope

(5mV

or

better

sensitivity,

X-Y

capability)

e

Frequency

Counter

e

Detector

Probe

IMPORTANT

NOTES

1)

RF

levels

are

at

antenna

input.

2)

Before

alignments

commence,

switch

off

IF

NARROW,

FM

NR

and

MONO;

select

FM.

3)

If

FM

Generator

is

not

synthesizer-type,

be

sure

to

check

its

frequency

with

Frequency

Counter

when

adjusting

detector

and

multiplex

decoder

circuits.

4)

Hum

in

measurements

may

be

caused

by

ground

loop

via

antenna

cable;

if

so,

use

isolation

balun,

or

isolate

cable

shield

and

hot

with

small

capacitors

(470~

1000pf).

To

adjust

front-end

coils,

bend

gently

with

wooden

or

plastic

tool

(non-interactive).

—

5

—

A.

FM

LOCAL

OSCILLATOR

FREQUENCY

1.

Connect

Frequency

Counter

between

TP-107

and

Ground.

2.

Tune

to

90

MHz

(No

RF

input

needed).

3.

Adjust

C-278

so

that

reading

is

100.700MHz

+/—

2kHz.

B.

FRONT-END

ALIGNMENTS

(should

only

be

necessary

after

repair

to

front

end).

TUNING

VOLTAGE

1.

Connect

DMM

between

TP-101

and

Ground.

2.

Tune

to

88.00MHz,

and

adjust

L-6

if

reading

is

not

3.2V

+/—

0.5V.

3.

Tune

to

108.00MHz,

and

check

that

reading

is

22.5V

+/—

1.5V.

4,

Repeat

above

steps

2

and

3

until

within

tolerance.

TRACKING

1.

Connect

FM

Generator

to

75

ohm

antenna

input

(modulate

+/—

150kHz

sweep)

and

Detector

Probe

to

Pin

1

of

IC-103

(ground

to

tunershield).

2.

Adjust

vertical

sensitivity

of

Oscilloscope

to

maximum,

and

set

to

X-Y

mode.

(X

input

is

sweep

signal,

Y

is

detector

probe).

3.

Set

tuner

to

105MHz,

enter

into

Preset

2,

and

adjust

generator

so

that

curve

appears

on

Oscilloscope,

and

covers

approximately

1/2

of

display.

4.

Adjust

C-2,

C-10

and

C-12

for

maximum

curve

height,

while

reducing

FM

Generator

output,

if

necessary,

to

keep

entire

curve

on

display.

.

Set

tuner

to

9OMHz,

enter

into

Preset

1,

and

adjust

Generator

so

that

curve

appears

on

Oscilloscope.

.

Adjust

L-2,

L-4

and

L-5

for

maximum

curve

height.

7.

Repeat

above

steps

3, 4,

5

and

6

(use

Preset

1

and

2)

until

both

curves

are

at

maximum

height.

Note:

105MHz

curve

is

typically

slightly

higher

than

90MHz.

a

—

b

=

Oo

ol

Cc.

IF

ADJUSTMENTS

1.

Set

tuner

to

approximately

98MHz

(must

be

an

unoccupied

frequency),

and

adjust

FM

Generator

to

display

curve

on

the

Oscilloscope.

2.

Adjust

L-8

and

L-101

for

maximum

and

symmetrical

curve

using

as

little

RF

input

as

possible.

.

DETECTOR

ALIGNMENT

.

Remove

Detector

Probe,

and

connect

the

Tape,

Output

to

Distortion

Analyzer

and

Oscilloscope.

.

Connect

DMM

between

TP-103

(—)

and

TP-104

(4).

.

Tune

to

98MHz

and

feed

1000uV

from

FM

Generator

(Modulate

1kHz

100%,

Mono).

.

Adjust

L-102

Secondary

for

lowest

THD.

Specification:

less

than

0.12%.

.

Adjust

L-102

Primary

for

OV

reading

on

DMM.

Tolerance:

+/—

50mV.

.

Repeat

above

steps

4

&

5

until

no

further

improvement.

aoahands

—

.

STEREO

DISTORTION

&

SEPARATION

.

Tune

to

98MHz

and

feed

1000uV

from

FM

Generator.

Modulate

1kHz,

100%

left

(or

right)

only.

.

Adjust

L-101

and

L-8

just

slightly

so

that

distortion

on

left

(or

right)

channel

becomes

minimum.

.

Check

stereo

distortion,

wide

IF:

Specification:

less

than

0.1%,

L

+

R,

L

only,

R

only,

L

—

R.

.

Next,

select

IF

NARROW,

and

check

distortion:

Specification:

less

than

0.15%,

L

only,

R

only,

L—

R.

.

Set

IF

to

wide

and

modulate

L

only.

Adjust

R-375

for

minimum

output

on

right

channel.

Next,

modulate

R

only

and

adjust

R-375

for

minimum

output

on

left

channel.

lf

necessary,

readjust

R-375

so

that

readings

become

same

on

both

channels.

Specification:

more

than

46cB.

6.

Select

IF

NARROW,

and

modulate

left

(or

right)

channel

only.

Adjust

R-376

for

minimum

output

on

right

(or

left)

channel

VTVM

and

Oscilloscope.

If

necessary,

readjust

R-376

so

that

readings

become

same

on

both

channels.

Specification:

more

than

40aB.

ah

WKND

=

.

AUTO

SEARCH

LEVEL

1.

Set

IF

to

wide.

Connect

DMM

between

TP-105

and

Ground:”

2.

Set

FM

Generator

output

to

10uV

and

adjust

R-

o78

so

cent

reading

just

goes

from

OV

to

40V.

Tolerance:

+/—

2pV.

.

STEREO

SWITCHING

LEVEL

1.

Set

FM

Generator

output

to

5uV,

1kHz

100%

L

+

R.

2.

Adjust

R-379

so

that

the

stereo

light

just

turns

on.

Tolerance:

+

2uV.

Note:

The

tuner

will

switch

into

mono

at

a

lower

level,

‘ypically

4uV.

.

SIGNAL

METER

LEVEL

1.

Tune

to

98MHz

and

feed

100uV

from

FM

Getic

ator

2.

Adjust

R-380

so

that

fifth

LED

just

lights.

PARTIAL

MUTING

1.

Set

FM

Generator

output

to

0.5uV,

1kHz

30%

Mono

modulation.

Set

R-381

full

CCW.

2.

If

S/N

above

702760;

set

FM

NR

on,

tune

away

from,

then

back

to,

RF

Generator

frequency.

3.

Adjust

R-381

so

that

muting

just

turns

off.

.

FM

NR

CIRCUIT:

MULTIPLEX

FILTERS

1.

Check

that

FM NR

is

off.

.

Set

FM

Generator

output

to

2000uV,

1kHz

100%

L

+

R,

and

set

reference

for

S/N

measurement.

Cancel

the

stereo

modulation

and

leave

pilot

tone.

.

Adjust

FL

102

(FL

103)

for

minimum

subcarrier

output

on

left

(right)

channel;

Specification:

less

than

—

60dcB:

.

Adjust

FM

Generator

output

so

that

S/N

ratio

reads

50cB.

.

Switch

FM

NR

on,

and

adjust

R-148

so

the

S/N

is

improved

by

8dB.

.

Switch

FM

NR

off,

and

adjust

FM

Generator

output

so

that

S/N

ratio

reads

60cB.

.

Switch

FM

NR

on,

and

check

that

S/N

is

improved

by

approx.

2dB.

N

SN

Oof

W

10