Sharp WF-971T Bedienungsanleitung

SHARP

WF-9711

SERVICE MANUAL

No. SX674WF971TBK

WF-971

T(BK)

• Inthe

interests

ofuser-safety theset

should

restored

toits

original

condition

and

only

parts

identical

to those

specified

should be used.

CONTENTS

Page

SPECIFICATIONS 2

NAMES OF PARTS 3

FITTING OF DIAL POINTER 3

DISASSEMBLY 4

REMOVING AND REINSTALLING THE MAIN PARTS 5

ADJUSTMENT 6

SCHEMATIC DIAGRAM / WIRING SIDE OF

PW.BOARD

NOTES ON SCHEMATIC DIAGRAM 12

TYPES OF TRANSISTOR AND LED 12

REPLACEMENT PARTS LIST / EXPLODED VIEW

SHARP CORPORATION

v,v

,r~~I'

FOR A COMPLETE DESCRIPTION OF THE OPERATION OF THIS UNIT, PLEASE REFER

TO THE OPERATION MANUAL. - -

> .

.../.. '- .. ,.;

....

,.'

SPECIFICATIONS

Specifications for this model are subjectto change without

prior

notice.

10 W

3 ohms (surround speaker

6 ohms)

Width; 195 mm (7-11/16")

Height; 217 mm (8-9/16")

Depth; 189 mm (7-1/2")

1.2 kg (2.6 Ibs.)/each

12 em (4-3/4") free-edge

speaker x2

5 em (2") surround speaker x2

Wow and

flutter:

Motor:

Bias

system:

Erase

system:

• Tape recorder section

Frequency response: .60 - 12,000·.HZ (Normai tape)

Signatiiioise rafto: 40 dB (TAPE 1, recording/

playback)

55 dB (TAPE 2, playback)

0.15 % (DiN 45 511)

DC 12 V electric governor

AC bias

Magnet erase

Dimensions:

Weight:

Maximum

input

power:

Impedance:

• Speaker section

Speakers:

FM; 64 - 108 MHz

MW; 526.5 - 1,606.5 kHz

LW; 148.5 -283.5 kHz

AC 220-230 V,50 Hz

DC 12 V ["D" size (UM/SUM-1,

R20 or HP-2) battery x80r

external DC 12Vj

30 W

PMPO; 60 W (30 W + 30 W)

(AC operation)

MPO

(M~.);

20.W (10 W

+10

(AC operatidn) i

RMS; 10 W (5 W + 5 W)

(DC operation, DIN 45 324)

Mixing microphone; 600 ohms

CD/LINE; 350 mV/47 kohms

Headphones; 16-50 ohms

(recommended; 32 ohms)

Width; 300 mm (11-13/16")

Height; 217 mm (8-9/16")

Depth; 186 mm (7-3/8")

2.9.kg (6.4 lbs.) without bat-

terieS'

• General

Power source:

Output

terminal:

Power

consumption:

Output

power:

Dimensions:

Input

terminal:

Weight:

• Radio section

Frequency

range:

-2-

..,g

"i'

~.-\)

),::-:~'J,-,_.,:

,,:.,j

:::,-

,',

•.

:nn

16-171819~0

~-223~4-2526--

1_,TAPE.1

Ilr

TAPE{2:"" 1

HJ"-'.

" • i

'c,,",.'

"' j - I

,28,1,29

.,30:

i~1

N~MES:;OF-

PARTS

1 2

34561

Bxtra Bass Control: X·BASS

Graphic

Equ~lizer

Controls

FM,JStereo,lndicator

4.'

'Pc3wer

Indicator,

(tAPE

2j Play Direction Indicators

Function

Selector Switch

iMQlume ,Control

,P.u,b.bing

:Speed/Built-in Microphone/FM Mode

Switch

Bullt~in

Mlcropho'ne

10.

Tuning C9ntrol

11.

Band

,S~,ector

SWitcl;l

12;

Headphone

So~ket

13;'Mixing Microphi:>ne Socket

14.

Surround

SWit~h

15."(tAPE:1fcassetie

Com~artment·

16;

(fAPE

ljRecord

B~llon:

•

17., (TAPE1)'Play,Sulldn:...., I '

,,'!',

1S:''tTAPE,1) Rewind

Bullon:,,..

...

."n:,··c. i

.'.'

.' .:'" -

,.-

......

1'9. (TAPE 1) Fast Forward Bullon:

20.

(TAPE 1) Stop/Eject Bullon:

21.

(TAPE 1) Pause Bullon:lin,

22.

(TAPE 2) Reverse Mode

SWitch:~~",_

<=>

23.

(TAPE 2) Play Button: ...

24.

(TAPE 2) Fast Wind Bullons:

25.

(TAPE 2)

Stop/Ejec!sUllon:

.~.

26.

(TAPE 2) Direction Switch: .......

27.

(TAPE 2) ceeeette ComparbTIenL ..

28•.FM'Telescopic'

Rod

Aerial

29.

CD/L.in~

I.nputSockets

30.

Beat

caneet

Switch

31.

Surround,

spe~ker'iei'minaIS

32.

Speaker Terminals

Power.

Input

Socket

3,4.,

,?-q,

Pow~r

Input!g'ocket

35.'

Battery Compartment

36.

Surround

Speaker'

37:

F'lin

Range Speaker

38.Sass'

hertex Duct '

as:L",

S#~ak~r

'Relea's~

lever

40.

Speaker

Wir~

Main PWB

Screw(B06)

1U1-ft-~~;::&'

xamm

Tape

Mechanism

'II!

FITTINGOF DIALPOIN,.ER

Di~i

PO,inte;~(203),,,

"~II

,':,,""

.•

,,:,;,,',"

,IIO""I'p'o'I'nt

"F7¢="I,

ialPointer (203

Remove

themainPWB.Allachthedialpointeras

shown

arrow

®onthefrontcabinet, puttingit'intothesection

indicated

arrow®.Insertit betweenthearrows©.

2.InstallthemainPWB

in.tb,e

frontcabinetand

secure"il

withthe

two screws.' ,

,,'

,';,

I •

,.~"~,

.1,,;;:-

3.Turnthedial

drum

inthe direction indicated by arrow@. Set

the dial pointerto point "0", and then make the rest of the

adjustments.

F'igure

-3-

WF·971T DISASSEMBLY

Front

Cabinet

Front

Cabinet

(A2)x2

x10mm

~~~

t(A7)

//--=;;dR-c-r- Main

PWB

(E2) x1

Figure

4-2

(M)

x20mm

Rear

Cabinet

Figure

4-1

(D1)x2

03x8mm

Front Cabinet Main Nat

PWBVolume

PWB (B1) xt

Washer

LED

PWB

Graphic

Equalizer

PWB

Surround

PWB

Open

Casselle

Holder

(Lefl/Right)

(C1) x4

esxarrm

Caution

Disassembly

Follow the below-mentioned notes when disassembling

the unit and reassembling it, to keep it safe and ensure

excellent performance:

1. Take cassette tape out of the unil.

2. Be sure to remove the powersupply plug from fhe wall

outlet before starting todisassemblethe unit and remove

the batteries from the unil.

3. Take off nylon bands or wire holders where

they

need

be removed when disassemblingthe unil. Afterservicing

the unit, besure to rearrangethe leads where they were

before disassembling.

4. Take sufficient care on static electricity of integrated

circuits

and

other

circuits

when

servicing.

SPEAKER

MAIN UNIT

STEP REMOVAL

PROCEDURE

FIGURE

Front

Cabinet!

Battery

Compartment

Rear

Cabinet Lid ..................

(Al)xl

4-1

2. Screw...............

(A2)x4

3. Screw............... (A3)xl

4. Screw...............

(M)xl

5. Screw...............

(A5)x5

6. Socke!.............. (A6)xl

7.Tip.................... (A7)xl

2MainPWBI 1. Knob................

(Bl)xl

4-2

VolumePWBI 2. Socket..............

(B2)x5

Surround PWB 3. Screw...............

(B3)x2

Graphic

Equalizer

1.Screw............... (Cl )x4 4-2

PWB

4LED

PWB

1. Screw............... (01 )x2 4-2

5Tape

Mechanism

1. Openthe

cassette

holder

4-2

2. Screw............... (El )x5

3. Lug................... (E2)xl

Power

PWB 1. Screw............... (Fl )xl 4-3

2. Bracket.............(F2)xl

STEP REMOVAL

PROCEDURE

FIGURE

Front

Panel

1. Screw............... (G1)x4 4-4

Woofer

1. Screw............... (G2)x4 4-4

Surround

1.Screw............... (G3)x2 4-4

Woofer

Speaker Cord

Holde:...r

Speaker

~r=''!CCord

0",-::'...-_Driver

(G1) x4

03x16mm

Power

Transeformer

SpeakerBox

Figure

4-4

Figure

4-3

-4-

WF~97:tT

:~';~:\-)

';':

''',

C02.}

Special Screw

1'-TA:PE21

;,j-

Playback

Head'-

tI TAPE'2 1 " '

Pillch.Roller'

,195f

,,,i).

Pinch

Roller

Pawl" •..

...........

.,,,

'(l)

:JI:T'APElf;!

(AI)

,,1·.

i, ,·,

..•.

,.0:'1

02x3mm, ,J

',-,

,,~'-,)

·,·;CRecord/Playback

-Head

<_1.'-,.';

',1

Figure 5-1

Figure

5-2

Motor

Figure 5-4

.Figure

5"'3

i.: i

, ):'.:

iI~:d'J~)",'i');)

;".

(81-)-1<1-

02x6mm

Hook

~A,2)

,,:;....'. . ,

·:::

",. ,

[TAPE

'in

Pinch·Rolier

- @ " . (Cl).·.·.· .

",,'

"'j

',J

PinchRoller

Pawl

REW/ FF

Belt REW

/FF

(E3)xl ClutchAss'y

TAPE

Mater

,',"

ITAPE21

Frywheel

REW/ FF

Belt

(E3)

REMOVING AND

~EINSr~LlING

THE MAIN PARTS

TAPE

MECHANISM SECTIOllj:J

Perform steps 1, 2 and 5 of the dis!lssembly""methbd to

remove the tape mechanism. (See page

4';)

J::

'i.""'1·I">:,

':'

-'.

;-:';

':-l'

':~

-~:'"

How

to removethe record Iplayback;playback

and-e-iaseheads

(See

Fig.5~1·

and5~2.)

...

',I. Remove

thif~crews!

(,I\I}x~

pCS:;LtO'

remove.the:recordi

playbadffl6:ad.

~'iL';)i]'

...

'_',

_, '._ .. 1 .. _

....

...

,2.Rembv.em;e..

hQiqk~(A2P(2pts:;toW~rd

the

tef1terpositi~rl

;

a.~;,~.~,o",,~}n;

~iq,)5,1.

and then extia9t the erase head

.. upward. __

..1_

_ . __ 1

'3. Remove

thescrews

:(Bl)

x2 pcs., to remove the

plaYbae~

'head.

-;:;:)i';

:",;YT ::-;;

,',"<)

iNote:~::<';;:i'-:'

":'-,i,]::.;

):-1

,1:1,>:'))

';:

.,1i,:.:';, ,

.".

,I. The-playbaclc.

hea~

of this

m~pqi'.~i.s,m

is supplied as

.;:finished product with

f1exiplE\;Pi!V,!;l,',

Hi I

Before removing the flexible PWB,.:re"love the solder on

ithe switch.

\.-

...-

......

",--

_..

2. After replacing the 'heads'

lliiiJ'·ila.ri6r~ing

the"iizirh~tJ1

"',

-."

'''',

. ' t l .:. ':_.' '."

adjustment, be

sure:t(j~applyscrewIQck:i'

How

to remove the pinch ,roUetl

l(See,Fig.

15-3.)

il.

Carefully bend the pinch rollerp,,"wl

h,'

the direction of the

arrow

®,

and remove the pinch

ron'er

(C1

rand

(C2)

upwards.

How to remove the motor (See Fig. 5-4.)

1. Remove the beit.

''liT:'!:

2..Remove

the

screws,

(Dl)

x4pcs.,

toremovelhe

motor

bracket,,_', ,.,

~h;;~'j:'i

i~.:~'

Rem~v~'

ik~'~crewsi

(D2)JxJ3:pcs'iitcYramovethe motor.

i,lJ..':)-,),I,

',.1

" .

Note:

When

ffi,!untiqg themotor, pay attention to the m6t6rmount;

'ing

,argl~~;:

;'::'1'

j":'1i;

'",")

!_~:'

-;.,,;.

How

to remove the belts (See Fig. 5-5.)

..."

'1.

Remo~ethe"rriaiil

b~lt

(El)

pc:,aitHe

lapefs1defro"l

. the motor

pulle\C:

":".

2. Remove the:ri1airibelt (E2).x:li pc.cat the tape 2 slde.from

therhotor'plilley.

'3.

m;rhove

the REW/FF belt,(Eii)

1<2.

pcs., from the REW/FF

roller.

4:PUf

on the beits in the reverse order of removal,

Note:

When putting on the belt, ascertain

thatthe

5eitisnot

twisted,

.and clean it.

WF-971T

MECHANISM

SECTION

• Driving Force Check

ADJUSTMENT

TUNER SECTION

fL:

Low-range

frequency

fH:

High-range

frequency

Torque

Meter Specified Value

Play: TW-2412 Tape 1: Over 50g

Tape 2: Over 60 9

• Torque Check

Torque

Meter Specified

Value

Tape

Play: TW-2111 30 to 60 g.cm 30 to 60 g.cm

Fast forward: TW-2231 55 to 120 g.cm 80 to 135 g.cm

Rewind: TW-2231 55 to 120 g.cm 80 to 135 g.cm

• Head Azimuth

Test Tape Instrument Connection

MTT-114

Headphones

Socket

(Load

resistance:

ohms)

• Tape Speed (Normal only)

TestTape Adjusting Specified

Instrument

Point

Value

Connection

MTT-111 Tape 1.2: VR501 3,000 ± 60 Hz

Headphones

socket(Load

resistance:

32 ohms)

TAPE

SECTION

Position of each switch or control

Volume

control

Max

Beat

cancel

Function/Power

Tape/Stand-by

Dubbing

speed/Built-in

Microphone

OFF/Mic ON

• Bias Oscillation Frequency

Specified

Value

Beat

cancel

100±4kHz

94±4kHz

C: 104

±4

kHz

• Playback Amplifier Sensitivity Check

TestTape Specified

Value

Instrument

Connection

MTT-118 1.3 V ± 3 dB Speaker

terminal

(Load resistance: 3 ohms)

• AM IF/RF

Specified

Instrument

Test

Stage

Value/Adjusting

Point

Connection

IF T3 Input: Antenna

Output: Pin 3 of IC2

MW Band fL: L6 Input: Antenna

Coverage fH: TCa Output:

MW Tracking fL (600 kHz): Headphones Socket

L3(MW)

(Load resistance:

fH (1,400 kHz): azohms)

TC7

LW Band fL(148.5kHz): L7

Coverage fH(283.5kHz): TC4

LW Tracking

fL:

(LW)

fH : TC2

• FM IF/RF

Specified

Instrument

Test

Stage

Value/Adjusting

Connection

Point

IF T1 Input: Antenna

Detection T2 Output: Pin17 of iC2

Band Coverage fL: L2 Input: Antenna

fH: TC6 Output:

Tracking fL (88.0 MHz): Headphones Socket

L1 (Load resistance:

fH (108.0 MHz): 320hms)

TC5

• VCO Frequency

Test

Stage

Specified

Value

Instrument

Connection

VR1 76 kHz ± 200 Hz Pin 13 of IC2

-6-

JMAINPWB I

)

•

-rC2@@I®I~5"

.. ' TCa

,TC3@1(§J

ILa

TG70

'."

L.7eL-Ifi-rrIMi'lti\m---:'1

,.,

','

"TC4

r;:-, ...

TS'TC50

'"'

i±lloili'

f:\Y~~T~P]8JQ~fM\~

'fA~I~II~I:'

,.,~"'T.@".~,

"'<§)-,

12 ®1

:1:;1;

IC1

L6 '

"r-iQ2l'

I' T1

fH fL

VR1'

T2j

(§J

~gV~~~~E

FM DETECTION IFM IFI

Ivcol fH fL

FM BAND

COVERAGEi

TRACKING

IMAIN

PWBI,

Figure

7-1

ADJUSrME~T

POINTS

ITAPE

SPEEDI

VR501

ICNP501 I

IC401

j'/

FigureNAoJUSTME;NT

,PQI~TS·.

-'7-

WF-971T

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

SW40'O

~1l

~~~~J~~~

SW401C

•

STAND·BY

flAPE R1tB

rc'b

WER O

RADIO

~~W-B,(

0504,

M010R

CONTROl.

;.J~

'00'

I()§-

".-

10K(B)

.~~

~JR

<:Joe

POWERON/CD

r-s

RADIO

STANO-8m-APE SW401A

FUNCTION

SW103A

FMMONOIFMSTEREO

0120

4.7150

R120

l103

R119

2.7mli

C119

41150 -a

~~~~

R157

~;!

R158

~§

05020503:

SWITCHING

470K

C117

0,015

(MLI

1N4145

tat

'"'

,I>

1N4148

•

042

1~4.7150

!"'Coo

'00

HI·SPEED DUBBING: ( )

NORMAL SPEED OTHER

SW10l RECORD/PLAYBACK

1/50

100110

SW101F

F'~I'

_F======:'J

p~?~Ab'l(

FMIF

112 CFl

~~1

i;3E

HI-

- - ,I

O?kll

nci

,+-----.,-"---+---1-----'-+----""'--"

,,~

0.02

9~2

•

silE~~

'" '"

"•

sYn

Bp1r1A

I-

~"'"'

IC1

MIX

~~.£J

TA737BP

GNOr--

vee

FRONT END

R150

R151

MAIN PWB A1

CNP10~

Te7 ;

FMBANDPASS

FinER

BPF',

L·CH

I@~-":;o;,

GDILINE

I~j-~-;~f::t::::==:::;;~;;;:=========f::=====f================il

R-CK

wctot

BUILT-IN

MICROPHONE

Jl01

MIXING

MICROPHONE

lN4148

OOANTENNAI

NOTES ON SCHEMATIC DIAGRAM can be found on page 12.

1 2 3 4 56

Figure 8 SCHEMATIC DIAGRAM (1/2)

-8-

r-'

JNTAOI.

--------,

rca

WF;'971Ji

"' "rce

rtrr i)

VO~TAG.E

~~.

'.VOLTAGE-,:,

hPE

"0.

FM ',,_ " MW

13. a..v ,

rfii

,. 14' ri'I

15', '.:lV

L:!TC6

l:CS'.

16-, lV "

n, IH',

r'';<V FMBA"D MW .

•

'.'V'-

COVERAGE

"1.av

•,. 00

,. at

ea u. .

ea ,CW

,. ,. ,. m4CKING

rc,

n, ".

LW!IAI'ID

COVERAGE

icect

~y.

VOLTAG

';r

..•.•.....

-- - ,-

J403 '

,HEADPHON~

-------'

78:11 ,12 I

WF-971T

-------:-----------

l:L~

TAPEMECHANISM WH ,

,'!)""

EAASE(6B)

HERAD

""~

330HZl

VR253 c:

1kHz

ll~

~;ij!

VR252

ffi

''"'

VR261

10kHz

CNS251

•

+'''*-+-''4

IGRAPHICEQUALIZERPWB-B I

CNS103

CN5~

SW503

TAPE2

PCAY

M501

TAPE

MOTOR

AECDROIPLA

YBACK(B6)

',",0

SWS02

TAPEl

""'"

SW501

TAPE2

MAIN

(246)

-------------------------------RO---------------.,------------

(2~5)

(246)

T601

POWgR

TRANSFORMER

S0601

"~_

KCP~~~:PC'

0AC220V 230V

'"',

(232)

.~--...=---{o::::::::J---u---------u------------

BATTERIES

DC,2V['O'size(UMlSUM·l,

R20orHP·2jBATTEAY X 5]

SW601

VOLTAGESELECTOR

AC220V-240V ACt lQV-127V

COLOR TABLE

BR BROWN

AD ,EO

RANGE

H YELLOW

GREEN

at. BLUE

H VIOLET

GY GRAY

WHITE

ax BLACK

PK PINK

23 4 56

Figure 10 WIRING SIDE OF P.W.BOARD (1/2)

-10-

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