Sharp WQ-T37OA User manual

SHARI=

SERVICE

MANUAL

SYOC7WQT370AG

WQ-T37OA(

GY)

In the interests of user-safetythe set should be restored to its original

condition and only parts identical to those specified be used.

INDEX

CONTENTS

Page

SPEC,F,CAT,ONS

..................................................................*

STR,NG,,+G

D,AL

CORD

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

NAMES

PARTS

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

DISASSEMBLY

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

REMOVING

ND REINSTALLING THE MAIN PARTS

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

-5

ADJUSTMENT

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

..6.7

EXPLODE,,

VIEW

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

.fj-,,-J

BLOCK DIAGRAM

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

SCHEMATIC DIAGRAM/WIRING SIDE OF P.W.BOARD

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

..l.

..13~2

REPLACEMENT

PARTS

LIST.

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

.2l-25

SHARP

CORPORATION

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

REFER TO THE OPERATION MANUAL.

General

Power source:

Output power:

Speakers:

Input impedance:

Load impedance:

Dimensions:

Weight:

1. Turn tt

le drum fully in the

drrectron

(8,

shown in Fig. 2-2 and

stretch its cord over the parts in the numerical order.

2. Then turn the tuning control shaft fully in the direction

shown in Fig. 2-2 and fix its pointer as shown in Fig. 2-1.

SPECIFICATIONS

AC 230

240 V, 50 Hz

DC 12 V [“D” size

IUM/SUM-l,R20

HP-2

)

battery x 8)

(Left

Right

Extra bass)

PMPO; 60 W

(15

W + 15 W

(AC operation)

MPO; 27 W (7.5 W

7.5 W + 12

(AC operation)

RMS;l6W(4W+4W+8W)

(DC operation, 10% T.H.D.)

8 cm (3-l

/8”)

free-edge super woofer

12 cm

(4-3/4”)

free-edge woofer x 2

Tweeter x 2

Mixing mic; 600 ohms

CD/Line in; 50 k ohms

Headphones; 16-50 ohms

(recommended 32 ohms)

Width; 560 mm

122-l/16”)

Height; 210 mm

(8-5/16”)

Depth; 187 mm

(7-3/8”)

5 kg 11 1

Ibs.)

without batteries

Radio

Frequency range: FM; 87.6

108 MHz

AM; 526.5

I,6065

kHz

Tape recorder

Tape: Compact cassette tape

Frequency response: 60

12,000 Hz (Normal tape)

Signal/noise ratio: 55 dB (TAPE 1, playback)

50 dB (TAPE 2, recording/playback)

Wow and flutter:

0.15

(WRMS)

Specifications for this model are subject to change without

prior notice.

STRINGING

DIAL

CORD

‘0”

Pdnt

Figure 2-1

Dial Cord

Asiy(g4g)

‘I

Turns

drum

1236)

Figure 2-2

-2.-

NAMES

PARTS

Volume Control

2. Graphic Equalizer Controls

3. Headphones Socket

4. Surround Speaker Sockets

5. Beat Cancel Switch

6. Dubbing Speed Switch

Power/Function Switch

8. CD/Line Input Sockets

9. Mixing Microphone Socket

10. Radio Band Selector

11. Tuning Control

12. Power Indicator

13. Surround indicator

14. Extra Bass Indicator: X-BASS

15. Extra Bass Switch: X-BASS

16. Surround Switch

17. FM Stereo Indicator

18. Bass Boost Horn

19. Cassette Compartment

20. Tape Mode Switch

21. TAPE 2) Pause Button: II

22. TAPE 1, 2) Stop/Eject Button: N

23. TAPE

Fast Forward Button:

24. TAPE

Rewind Button:

25. TAPE 1, 2) Play Button:

26. TAPE 2) Record Button:

27. FM Telescopic Rod Aerial

28. AC Power Input Socket

-3-

29. Battery Compartment

DISASSEMBLY

Caution

on Disassembly

the below-mentioned notes when disassembling the

unit and reassembling it, to keep its safety and excellent

performance:

1. Take cassette tape out of the unit.

2. Be sure to remove the power supply plug from the

wall outlet before starting to disassemble the unit and

remove the batteries from the unit.

3. Take

off

nylon bands or wire holders where they need be

removed when disassembling the unit. After servicing

the unit, be sure to rearrange the leads where they were

before disassembling.

4. Take sufficient care on static electricity of integrated

circuits and other circuits when servicing.

Rear

Cabins

Plug-

PWB

STEP REMOVALPROCEDURE FIGURE

Battery

lid..

. . . . . . . . . . . . (A,)

4-1

Screw..............(A2)x

Screw..............(Bl)x

;;;pnism

i2’

~~ecrharli.“::.mode....iB2)x,

3. Screw

....*.........(B3)x!j

Socket..............(B4)x

3 4-3

Main PWB 1. Screw

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

(Cj)x6

4-2.3

(with Frame) 2. Tip ................((-2)

4-3

4Socket PWB 1.

Screw..............(Dl)x

3 4-4

5Power

PWB

1. Screw

..............(El)x

3 4-4

(Ahx8

d3x65mm

Figure

4-I

Figure 4-4

(Av3)x

Figure 4-2

-hJvl;fanism

-?a

(B3lx5

d3xlOmm

:IOmm

11x4

Main

PWB

83xI2mm

Figure 4-3

Socket

PWB

(El)

Power

PWB

,(C2)

(DlJx3

Omm

x12mm

-4-

REMOVING

AND

REINSTALLING

THE

MAIN

PARTS

TAPE

MECHANISM

SECTION

Perform steps 1 and

of the disassembly method to remove the

tape mechanism.

How to remove the playback, erase and record/playback

heads (See Fig. 5-l

1. Remove the two screws

(Al)

to remove the playback head.

2. Remove the two screws

(A2)

and shield cover

(A3)

to remove

the record/playback head.

3. Remove the two screws

iA4j

to remove the erase head.

Note:

Be careful not to lose the head azimuth springs.

Figure 5-l Figure 5-3Figure 5-3

How to remove the pinch roller (See Fig. 5-2.)

1. Move the pinch roller

sprin$‘(Bl)

in the direction of arrow

to remove it from the play lever.

2. Move the pinch roller spring

(Bl)

in the direction of arrow

@to remove it from the pinch roller unit.

3. Remove the pinch roller in the direction of arrow

(El)x3

P2x6mm

$@;;;a

Metal

Pinch

Rol

ler

How to remove the drive belt

(See

Figs. 5-3 and 5-4.)

1. Remove the four screws (Cl

to remove the flywheel bracket

and switch bracket.

2. Remove the drive belt iC2).

How to remove the flywheel (See Fig.

5-4.)

Remove the capstan metal

(Dl)

and pull out the flywheel.

Note:

Be careful not to lose the three washers.

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

1. Remove the three screws (El) to remove the motor.

11x1

82.6x

IOmm

Figure 5-4

,wheel(D2)

Figure 5-2

-5-

ADJUSTMENT

As for adjusting method refer to the relevant explanation in

Service Manual “ADJUSTMENT PROCEDURES OF AUDIO

PRODUCTS”.

MECHANISM

SECTION

Driving Force check

Torque Meter

Play: TW-2412

Torque Check

Specified Value

Over 140 g

Torque Meter Specified Value

Tape 1 Tape 2

Play: TW-2111 35 to 60

u.cm

30 to 65

a.cm

Fast forward: TW-2231

)

to 135 g.cm

Rewind: TW-2231

80 to 135 g.cm

Head Azimuth

Test Tape

MTT-114

Instrument Connection

Speaker terminal

(Load resistance: 4 ohms)

Tape Speed

Test Tape Adjusting Point Specified Value Instrument

onnection

Speaker

Normal terminal

speed MTT-111 Tape 2: VR501 3,000

300 Hz (Load

resistance:

4 ohms)

TAPE2 AZIMUTH AfJJUSTWNT

SCREIW

TAPE1

AZIMUTH

ADJUSTMENT

SCREW

TAPE

SECTION

Position of each switch or control

Volume Max

Beat cancel switch A/STEREO

Graphic equalizer Center

Tape speed

Normal

-1

Mechanism mode

Function

Tape

Bias Oscillation Frequency/Bias Current check

Specified Value

A: 97

4 kHz

Beat cancel B: -2

2 kHz for A

C: -7

2kHz for

Resistor for measurement: 100 ohms 38

. Erase Current check

Specified Value

Resistor for measurement: 1 ohm 65 4 20

. Playback Amplifier Sensitivity check

Test Tape Specified

Vaiue

Instrument Connection

MTT-118 1.0 V

3 dB Speaker terminal

(Load resistance: 4 ohms)

ISOCKET PWB-~31

MAIN PWB-Al

r---L

TAPE2

NORMAL

SP(R)

CvP74Z

Figure 6 ADJUSTMENT POINTS

-6-

TUNER

SECTION

fL:

Low-range frequency

fH:

High-range frequency

. FM IF/RF

Test Stage

Specified

Value/

Adjusting Point Instrument Connection

. VCO Frequency

Adjusting Point Specified Value

VRl

38 kHz

100 Hz Instrument Connection

Pin 6 of IC3

AM IF/RF

Test Stage

AM Band

Coverage

AM Tracking

Specified Value/

Adjusting Point Instrument Connection

fL:

L5Input: Antenna

(TPI)

fH:

TC4Output: Pin 9 of IC2

600

kHz: L3

1,400

kHz: TC3

BAND

COVERAGE

SW1

MAIN

PwB-Ai)

-I-

Figure 7 ADJUSTMENT POINTS

-7-

TOP

VIEW

I i

510

4 5

Figure 8 TAPE MECHANISM EXPLODED VIEW

(l/Z)

-a-

BOTTOM VIEW

512

8-\

Figure 9 TAPE MECHANISM EXPLODED VIEW

(2/2)

-9

6Oix4

‘SPl,Z

250

Figure 10 CABINET EXPLODED VIEW I

-lO-

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