Sharp GX-68Z Manuale utente

SHARP

SERVICE

MANUAL

S3928GX-68ZBK

5tlI

DOLBY

SYSTEM @

Dolby noise reduction manufactured under license from Dolby Labora-

tories Licensing Corporation.

“Dolby” and the double-D symbol

[xl

are trademarks of Dolby Labora-

tories Licensing Corporation.

GX=68Z(

BK)

CP-XS(BK)

f-“---

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

condition and only parts identical to those specified be used.

INDEX TO CONTENTS

Page

SPEClFlCATlQNS ..................................................................2

STRINGING

DIAL

CORD

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

,,QLTAGESELEC-IoN

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

NAMES OF PARTS .............................................................*3,4

PROPER

USE

THE

REMOTE

CONTROL ...........................................

BLOCKDIAGRAM

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

DISASSEMBLY ................................................................

..6.7

ADJUSTMENT .............................................................

.*.&lo

,=,,NCTlQ,,,

TABLE

IC..........................................................,

SCHEMATIC DIAGRAM/WIRING SIDE OF P.W.BOARD ...........................

-12-23

EQUIVALENT CIRCUIT (BLOCK DIAGRAM) OF

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

*24-26

POWER

SUPPLY

CORD

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

.26

EXPLODED VIEW ...........................................................

.27-29

REPLACEMENT

PARTS

LIST

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

.30-37

SHARP

CORPORATION

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

REFER TO THE OPERATION MANUAL.

SPECIFICATIONS

OV-

127V/22OV-24OV,

50/60

DC 15V (External DC input)

1.5V

(UM/SUM-3

(for clock/

timer)

Power consumption: 130 W

Output power: PMPO; 240W

(12OW

12OW)

(AC operation)

Radio

Frequency range: FM; 88

108 MHz

MW; 526.5

1,606.5

kHz

SWl;

2.3

7.3 MHz

SW2; 7.3

22 MHz

General

Power source:

MPO; 120W

(6OW

6OW)

(AC

operation)

RMS; 40W

(2OW

+2OW)

(AC

operation, 10% T.H.D.)

Input sensitivity and impedance:

CD/LINE IN; 530

mV/47

kohms

Loaded impedance: Headphones; 8

50 ohms

(recommended 32 ohms)

Dimensions: Width; 290 mm

(11-7/l

6”)

Height; 280 mm (1

l-l/l

6”)

Depth; 230 mm

19-

/16”1

Weight: 6.4 kg (14.1

Ibs.)

Tape

recorder

Tape: Compact cassette tape

Frequency response: 50

15,000 Hz

(CrO,

tape)

14,000 Hz (Normal tape

)

Signal/noise ratio: 55

(TAPE 1, playback)

(TAPE 2, recording/playback)

Wow and flutter: 0.25% (WRMS)

Speaker

system

Type.:

2-way

bass reflex type

Speakers: 12 cm

(4-3/4”)

woofer

5 cm

(2”)

tweeter

Rated power: 2ow

Impedance: 4 ohms

Dimensions: Width;

180

(7-l/8”)

Height; 280 mm

(11

-l/16”)

Depth; 207 mm

(8-3/16”)

Weight: 2.5 kg (5.5

Ibs.)/each

Specifications for this model are subject to change without

prior notice.

STRINGING OF DIAL CORD

1. Turn the drum full-y in the direction

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

2-1.

DIAL PDINTER

TlJNERFwl3

E!RACKET<232)

blAL

ASS Y

(202)

Figure

Z-

(*“)

VOLTAGE SELECTION

Before operating the unit on mains, check the preset voltage.

If the voltage is different from your local voltage, adjust the

voltage as follows: Slide the AC power supply socket cover

by slightly loosing the screw to the visible indication of the

side of your local voltage.

-2-

NAMES OF PARTS

AM/PM

Indicator

Clock/Timer

Displav

Timer

Indicator:

Sleep

Off

Button

Sleep

Button

Hour

Button

Timer

Adjust

Button

Clock

Adjust

Button

Minute

Button

10.

Power

Switch

and

indicator

11.

Timer

Switch

and

Indicator

12.

Dolby

Switch

and

Indicator

13.

Stereo

Indicator

14.

Dial

Pointer

15.

Radio Band

Selector

16.

Fine

Tuning

Control

17.

Tuning

Control

18.

Function

Switches

and

Indicators

19.

Graphic

Equalizer

Controls

20.

Balance

Control

21.

Volume

Control

and

Indicator

22.

TAPE

Cassette

Compartment

23.

TAPE

Cassette

Compartment

24.

Record

Button:

25.-Play

Button:

)

26.

Rewind

Button:

27.

Fast

Forward

Button:

28.

Stop/Eject

Button:

29.

Pause

Button:

30.

Reverse

Mode

Switch:

31.

Play

Button:

32.

Fast

Wind

Button:

33.

Fast

Wind

Button:

34.

Stop/Eject

Button:

35.

Direction

Switch:

36.

Direction

Indicators

37.

Headphone

Socket

38.

Extra Bass

Switch

and

Indicator

39.

Remote

Control

Sensor

and

Indicator

40.

Meters

41.

Tape

Selector

Switch

42.

Mixing

Microphone

Socket

43.

Microphone

Volume

Control

44.

Pause

Indicator

45.

Tape

Speed

Switch

46.

CD/Line

Input

Sockets

47.

MW/SWl

Loop

Aerial

48.

FM/SW

Telescopic

Rod

Aerial

49.

Beat

Cancel

Switch

50.

Speaker

Lead

Holders

51.

Speaker

Terminals

52.

Battery

Compartment

53.

Power

Input

Socket

54.

External

Power

Input

Socket

Bass

Reflex

Port

Tweeter

Woofer

Speaker

Lead

Remote

Control

Transmitter

Window

Operate

Button

(Power

Switch)

Volume

Up/Down

Buttons

Pause

Button:

-3-

1.5

1617

///III

/II\\\\

2627

2829

3334

35 36

TAPE

DISASSEMBLY

Caution on Disassembly

Follow the below-mentioned notes when disassembling the

unit and reassembling it, to keep its safety and excellent

performance:

1. Take cassette tape 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, wire holders or connectors 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.

-t

(Allxl

03xlOmm

REMOVAL

PROCEDURE

FIGURE

Side Panel

(7. Screw

..+Al)xl4(

6-l

~‘““:::::::

Socket........(C2)X4

6-3.7-1,

Power Amp. PWB

3. Flat Wire. . . . .

(C3)

3 6-3

Screw . . . . . . .

.iDl)

6-2.6-3,

7-l

Volume PWB

Timer PWB

Socket........(D2)Xl

6-3

1. Knob . . . . . . .

(El

)

, 7-2

2. Nut

. . . . .

. .

(E2)

Socket*..-....(EB)Xl

4. Flat Wire ......

(E4)

1. Screw

........(F~)x

7-4

5_~

3. Flat

Wire......(HB)X4

7-1.7-3

Mechanism Block

1. Screw .

. . . . .

..(KliX71

7-4

HeadphonesPWB

Tape Switch PWB

Microphone PWB

1. Screw

. . . . . . . .

(Ll)X,

7-4

Screw..

. .

.(Ml

)

1 7-4

1. Screw

. . . . . . . .

(Nl)xl

7-4

Level Meter PWB

1. Hook

. . . . . .

..(Pl)X41

7-4

Remote Control

PWR

1. Hook

.......

.(0,)x2!

7-4

(

LED PWB

Screw. . . . .

..(Rl)xl

7-4

k(Al)x2

03xl2mm

(Cl1x3

63x8mm

Figure 6-1

hop

Cabinet

Front

Panel

Main Chassis

*Each P.W.B should be removed until the parts to be

exchanged can be removed when servicing. If the parts to

be exchanged are in the exchangeable condition, the rest

of P.W.Bs need not to be removed.

Power

Transformer

(Dl)xZ

03x8mm

Figure

6-2

(Dl)x

03x6mm

.(Cl)X2

03x6mm

-6-

I’

+82

Figure 5 BLOCK DIAGRAM

-5-

4243

50-

-50

46 47

48 49

PROPER

REMOTE

OPERATE

z---n

rVOLUME

DOWN VP

TAPE

PAUSE

4----o

CONTROL

Aim (within range of 60’ with no obstacles) the remote control

at the remote control sensor and operate as shown.

Notes concerning use:

Replace the batteries if control distance decreases or oper-

ation becomes erratic.

Periodically clean the transmitter window on the remote

control and the sensor on the main unit with soft cloth.

Exposing the sensor on the main unit to strong light can

interfere with operation. Reposition the unit away from the

strong light source.

Keep the remote control away from moisture, excessive heat,

shock, and vibrations.

The remote control’s usable range is between 0.4 m

feet)

and 6 m

(20

feet) away from the sensor.

60"

-4-

Front

Panel

Motchlng

PWB

, Bock Chossis

%+qy

Chassis

(Dl)xZ

A-

fa3

xl0mm

Figure 7

@“)”

Front Panel

&E2)

(Gllx2

63x6mm

(Hl)xl

pr3x6mm

Power

Switch PWB

Volume PW

+iMain

PWB

Figure

7-2

(Jllx2

Front Panel

83xlOm

F%P

!Hl\x

@3x6mm

Figure 7-3

Timer PWB

-(Fi)x2

11x2

3xlOmm

(Kllx7

‘Q3x12mm

LED

PWB,

(Rl)xl

03x8mmd

Microphone PW

B--f

03x8mm

(Milxl

(Nl)x I WB

1)x2

x6mm

03xlOmm

Level

Meter

PWB

Figure 7

-7-

MAIN

PWB-Al

CD/LINE

J281

,EMITTER

COLLECTOR

Q514

VRIOI

VR102

Figure

ADJUSTMENT POINTS

-lO-

MECHANISM

SECTION

TAPE

SECTION

. Driving Force check

Position of each switch or control

Volume

Beat cancel switch

Max

Toraue

Meter

Soecified

value

Play: TW-2412

Reverse play: TW-2422

. Torque Check

Over 50

Over

Graphic equalizer

Tape selector switch

Function

Dolby

Swrtch

Center

Normal

Tape

Off

Torque Meter Specified value

Taoe 1

Taoe 2

-a

Play: TW-2111 35 to

g.cm

30 to

g.cm

Reverse play: TW-2121 35 to 60

g.cm

30 to 60

g.cm

Fast forward: TW-2231 55 to 120

g.cm

55 to 120

q.cm

Bias

Oscillation Frequency check

Adjustment

ooint Specified value

Rewind: TW-2231

Head Azimuth

55 to 120

g.cm

55 to 120

g.cm

L341

104

1.5 kHz

Beat cancel

A: -2

kHzforB

c:-8

kHzfor

Test Tape

MTT-114

Instrument Connection

J602

(Ext.

SP)

(Load resistance: 4 ohms)

Bias Current check

Adjustment

nnint

Specified value

. Tape Speed

+z”“#L

Resistor for L:

VRlOl

Normal

CrO2

measurement: 10 ohm

VR102 460

,~A/720

.uA

Test Tape Adjusting Point Specified value Instrument

Connection

Normal

J602

speed MTT-111 Tape 2: VR502 3,000

60 Hz

(Ext.

SP)

Erase Current check

(Load

Specified value

;ftil

MTT-111 Tape 2: VR501 6,000

700 Hz

/ /

;f;:;;e’

Resistor for

measurement: 1 ohm Normal

CrOz

25*4mA145+7mA

set normal speed, short-circuit collector and emitter of Cl51 4.

Playback Amplifier Sensitivity check

Test Tape

Specified value

Instrument Connection

Tape

Playback Amplifier Sensitivity

Test Tape Adjusting Specified value Instrument

Point Connection

MTT-

150

L: VR201 Normal: 580 mV L: TP201

VR202

TP201 @

Tape 2 Playback Amplifier Sensitivity

Test Tape Adjusting Specified value Instrument

Point Connection

MTT- 150 L: VR203 Normal: 580 mV L: TP201

VR204

TP201

. Record/Playback Sensitivity

CASSETTE HOLDER COVER

Test Tape Adjusting

Point Specified value Instrument

Connection

MTT-502

HEAD

REVERSE

i-1

(FFI

HEAD

REVERSEI

HEAD

Figure 9 AZIMUTH POINTS

-9-

TUNER

SECTION

ADJUSTMENT

fL:

Low-range frequency

fH:

High range frequency

. AM IF/RF

Test Stage Specified value/

Adjusting Point instrument Connection

IC 7-9

Input: Antenna

MW band

I.3

fL:

Output: Pin 5 of IC2

coverage

fH: TC3

FM IF/RF

Test Stage

Detection

Band coverage

Tracking

Specified value/

Adjusting Point Instrument Connection

fL:

L2 Input: Antenna

fH: TC2Output: Pin 9 of IC2

88.0 MHz:

108.0 MHz:

TCl

TIMER

PWB-~3

40&,

,/’

‘)

IC551

. Clock Reference Frequency

Adjusting Point Specified value Instrument Connection

TC551 32,768 kHz

0.15 Hz

Pin 40 of IC551

Figure 8-l ADJUSTMENT POINTS

/TUNER

PwB-cl

Figure 8-2 CLOCK REFERENCE FREQUENCY

TC5

Figure 8-3 ADJUSTMENT POINTS

-8-

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