Nikko NT-850 Manual de usuario

STEREO

TUNER

NT-SSC

_..

...,

1111

TYPE

AND

VOLTAGE

W-TVPE

120V

and

CSA

type

·TYPE

standard

type

2201240V AC

N-TYPE

DEMKO

and

SEMKO

type

NIKKO

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9®

NIKKO

NT-B!!IO

...

(W-

TYPE)

(W-

TYPE)

POWER SWITCH

OUTPUT

LEVEL

CONTROL

BAND

SWITCH

HI-BLEND

SWITCH

MUL

TlPATH

SWITCH

MUTING SWITCH

TUNING

KNOB

SELECTOR SWITCH

TUNING

METER

10.

SIGNAL

STRENGTH METER

11. STEREO INDICATOR

12.

ANTENNA

TERMINALS

13.

LOQPSTICK

ANTENNA

14. DE-EMPHASIS SWITCH

15.

MULTIPATH

TERMINALS

(OSCilLOSCOPE JACKS)

16.

OUTPUT

TERMINALS

17. AC POWER SUPPLY

CORD

III

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..8thrul1

.....

thru

CONTENTS

SPECiFiCATIONS ,

DISASSEMBLY

.................•........

.....•.•....

•.....

" ,

•.........

SCHEMATIC

DIAGRAM

3,4

TUNER

CIRCUIT

BOARD (BOTTOM VIEWI

5,6

PARTS LOCATION , ,

.....•......••......

•.................

PARTS LIST

....................•.....•.•....••.•...

•.......•..

DIAL

CORD

INSTALLATION

..........•.......•......

•......

•..

ALIGNMENT

.....................•..

•..

....•......•.•....

•....

SEMICONDUCTOR

DATA

TRANSISTORS .

................•................•...............................

FIELD EFFECT TRANSISTORS

..........•........•....

.............•..........

DIODES,

LEOS

................•......•........................•.....•••........

ZENER DIODES

...........•....•.•....•.•••...•••.....•.••...••••....•.•........

INTEGRATED CiRCUiTS

18,

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SPECIFICATIONS

NOM.

LIMIT

NOM.

LIMIT

UNIT

(NOR.) (NOR.) (NARROW) (NARROW)

TUNER

SECTION

Usable

Sensitivity

......

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

dBf

(pV)

...

9.31 (1.6)

....

15.3 (3.2)

...

9.31 (1.6) ·

...

15.3 (3.2)

50 dB Quieting Sensitivity

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

dBf

(pV)

...

11.2 (2.0) .

...

20.2 15.6)

...

11.212.0) ·

...

20.2 (5.6)

Hum and Noise MONO

dB@65dBf.

70 65 70 65

STEREO.

dB@65dBf.

70 65 70 ·.65

Distonion

MONO

0.08 .0.3

0.1

·.. 0.5

STEREO(L"'-R)

0.12 0.3

0.2.

·.0.5

Capture Ratio .dB

l.5

........•.....

3 2

......••.......

Alternate Channel Selectivity

........•....

dB 60

.....•........

50 80

.....••.......

Spurious

Response

Ratio dB 100 80 100

....••.......

Image

Response

Ratio (98 MHz)

AM Suppression Ratio .

.....•........

....••.••.....

....•••.......

Response

Ratio (98 MHz)

...

.....

.....•..•.....

...

80 ·

..••.......

kHz) STEREO dB

....••........

40 45

Separation (100 Hz) STEREO dB

....•.........

...

35 ·

..•........

..••.•.....

(10 kHz) STEREO dB 40

....•

,30 30

.....•........

MHz

87.4-109

87.9-108.5

87.4-109

STEREO dB 22 22 ±5 .

FM Receiving Frequency

....•..•.....

Volts . . .

10.8 .

O.B

87.9-108.5

±5

4.5

±0.5

4.5 .

...........

4.5 .4.5 ±0.3

dB 65

STEREO.

Subcarrier Product Ratio

Separation. Hi·Blend

kHz)

Meter Sensitivity

@65dBf

Output

Level

Antenna Impedance

.......•......•..............

300 ohms balanced &

ohms coaxial

UNIT

NOM.

LIMIT

AM TUNER SECTION

Usable

Sensitivity Loopstick antenna .

pV!m

300

......••..••..••...•..••.•.•.....

1000

Signal·to·Noise Ratio dB

............•.......•......•........

Image

Rejection (1000 kHz) dB .75

.....•......••..••.••.•••.•••.•.....

IF Rejection

IHF Selectivity

(1000 kHz)

10 kHz)

........•....

dB .

.....•......••......•......••.......

.............•......•...............

AM Receiving Frequency

kHz-kHz

520 -1650

.......•......•........

525 -1635

Output

Level

400

............•.......•........

400 ±3dB

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DISASSEMBLY

Note: Three digit numbers circled

this

chapter

(

are

represented

a ( *)in the parts listing.

Cabinet Cover Removal

Remove seven tapping screws from

the

top

and

both

sides

the metal cover

shown in Photo

Bottom Plate Removal

Remove eight tapping screws from

the

bottom

the

unit

and

lift

away.

Front Panel Removal

Using hexagonal wrench, remove

TUNING

knob

from

the

front

the

unit.

Photo 1

Remove

SELECTOR knob

and

OUTPUT

LEVEL

knob

from

the

front

the

unit

pulling

them

forward.

3. Remove

two

nuts (1, 2) (Photo 2).

Remove

two

tapping screws

(1,2)

(Photo

3).

•

Lift

front

panel away

from

the

unit.

reassemble, reverse

the

procedure. )

000

"---i---i

Meters Removal

Disconnect cables

meters.

Lamps Removal

Pull lamps

out

from

the

bottom

the

REFLEX

PLT

(light

guide acrylic resin plate).

Power Transformer Removal

Disconnect all the power transformer cables.

Remove

two

tapping screws (3, 4)

(photo

3).

Lift

the power transformer

and

out

chassis.

reassemble, reverse the procedure.

Photo 3

Photo 2

Remove

two

tapping screws

(5,6)

(Photo 3).

Remove the meters

lifting

the meter bracket up

and

out

the

front

plate.

reassemble,

reverse

the procedure.

To reassemble, reverse the procedure.

•

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SCHEMATIC

DIAGRAM

S-"ETE

C'll

'a-WEt

TEA

T-

nER

..!!...._-

C30~

3.3

•

0.'

2SCIll~

BANOW'OT~

0.022

RlZ'\':&

N.~QW

.,.

LIOI

;,L•

g.2)oH

2J;.

;:::

" 0

R'.6

••

•

6il"_1~

C20•

EI'

''''/'0

•

B.R

'200~20

120V ONLY

W-HPE

,--

~--

---

~---~--

~--elo-,--

~.022

r--------------------------------

--,

F.E

FD62:IU £'

2SC7tl~

~"~

.,;"

ktLcb,

:';',:

"',h

"mumf..~,

,"h~~t;~'

IIL

M,,!

om:);

'illUill';J; 1Ii,j,

"'~

,~o.

100

, I a.on 22. I

l'I

L-::-..:

=-":".:2:.-:

{>--.,

'cc

0!I2~

-"A"~

I :

UC\.fl

CO,e I I , I

:':il(~'

1210420 I I I

+~:j:=q:

±'~

;;:;

710

r r

\!.:p,n :

'lrf

:~_~~:~·JIJ

r'!f

,~.

1~.I~l

:lI~

'U" C310,311

1010/16

;LI

'00'

C1'4

61~,'~l

•

'00;"

•

"•

r~1

l7.1~l

l7.7Vl

,'r

);,1

{','

•

"'l

"0•

••

I•••

, g

;

•

i•

ce03

10010/16

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Iq~~~====~

~_~_~_~_~_~_~_~_~

POWER

FM DE_EMPHASIS

6ANO

MUTING

MULTIPATH

HI-BLEND

SELECTOR

52.

- b

53._b

S4._b

Sr.._b

SlI._b

S7._0

...

"'0

"00:

,o~J,i

XZ-'H

i"'!.

.~,

"'OHS,

UNL~SSOTH~AWISE

SPECIFIEO;

RESISTANCE VA,AUES ARE

('I

....

K·

1,000.

"·',000,000

2CAPACITANCE

VALUES

1 0

AND

ABOVE

ARE

IP·

of,

·~FI.

LESS

THAN

1.0

ARE IN

ELECTAOl

Hie

CAPACITANCE

VALUES

ARE IN uf/WV

1M·

~FI

J. I

,INDICATES

VOLTAGES MEASUREO

WITH

SIGNAL APPLIED.

CIRCUIT

AND

SPECI~ICATIONS

ARE

sue

JECT TO CHANGE WITHOUT

NOTICE_

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, 0

I-

600'6'0

i::'

S11

...

•

.~,

_._._._._._._._J

"•0

.,;,,

,••

03O~S<:9'S

:;'

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\319

,,,

9.9"

••'"

CER"M,e

CAPACITOR

POLYESTER

FILM

CAPACITOR

f'Ol

YSTVRENE

CAPACITOR

,S207l;

TANTALUM

EUCTROL

YTle

CAPAC,TOR

."'2

'~2076

,,,

cIa

...

301

32'

C313

"319

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SCHEMATIC

DIAGRAM

P'OlYSTYRENE

"'LM

CAPACITOR

f!OHS

UNL~SSOTH~AWIS~

SPECIFI~O,

IRESISTANce VARUES ARE ,

DH'15.

K-UlOO,

1.1-1.000,000

lCAPACITANCE

VAlUES

1.0

AND ABOVE

ARE

IP,

pf,

'uFI,

LESS

THAN

ARE

HECTAOl

Hie

C.......

CIT

.......

VAlliES

ARE

uF/WV

1M·

uFI

J. I I

,NDICATESVOLTAGES

MEA5UAEO

WITH NO SIGNAL .....PLIEO

CIRC\lIT AND SPECIFICATIONS ARE

sua

JECTTO

CHANGE

WITHOUT

"OTleL

52.

~-.

S4._~

S!o.l_b

Sfi._b

57,_"

-_·--·--,,0-'--

--0,0.--·--'-102--

~_OZ2

2$CIU,

lSC147S

POWER

FM DE_EMPHAS'S

BAND

MUTING

MUlTWA,TH

HI·BlEND

SELECTOR L4

_._._._._J

CERA""CCAPACIIOR

@POL

veSTER

FilM

CAPACITOR

@TANTALUM ELECTROL

YrIC

CAPACITOR

_.--'

•

.•

\",

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TUNER

CIRCUIT

BOARD

(BOTTOM

VIEW)

(W-TYPE)

0001 Jl

•..

>ailING

MUl

Tll'ATH

lll-kL/ID

SWlTCfl

SWlTOl

SWlreM

_TeM

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