Sharp GF-320A Manuale utente

SHARI=

SERVICE

MANUAL

S2627G

F320ABK

F=320A(

F-320A(Y)

F-320A(

PHOTO:

GF-320A(BK)

in the interests of user-safety the set should be restored to its

original condition and only parts identical to those specified be

used.

INDEX

TO CONTENTS

SPECIFICATIONS . . . . . . . . .

STRINGING OF DIAL CORD . . . .

NAMES OF PARTS . . . . . . . , . . .

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

BLOCK DIAGRAM . . . . . . . . .

CIRCUIT ADJUSTMENT . . . . . . . .

MECHANICAL ADJUSTMENT . . . .

EXPLODED VIEW . . . . . . . . .

SCHEMATIC DIAGRAM . . . . . .

WIRING SIDE OF

P.W.BOARD

. . . .

NOTES ON SCHEMATIC DIAGRAM

TYPES OF TRANSISTOR AND LED

REPLACEMENT PARTS LIST . . . . .

Page

........

........2

........

........4

. . . . . . . . 5

. . . . . . 6-8

. . . . . 8

. . . . . 9,

. . .

II,12

. . . . .

13,14

. . . . . . 15

. . . . . . .

. . . . . 16-19

SHARP

CORPORATION

PLEASE REFER TO THE OPERATION MANUAL

GENERAL

Power source:

Output power:

(nput

impedance:

Loaded impedance:

Dimensions:

Weight:

SPECIFICATIONS

AC 240

50 Hz

DC 9

(UM/SUM-1

or R20

PMPO; 20W (low

low)

(AC operation)

MPO;

(4W +

4W)

(AC operation)

RMS; 3.8W (1.9W +1.9W)

(DC operation, 10% distortion)

External mic; 600 ohms

Headphones; 8-25 ohms

External speakers; 4-8 ohms

Width; 494 mm

(19-l/2”)

Height; 180 mm

(7-l/8”)

Depth; 130 mm

(5-l/8”)

2.8 kg (6.2

Ibs.)

without

RADIO

Frequency range:

TAPE RECORDER

Tape:

Frequency response

Signal/noise ratio:

Wow and flutter:

SPEAKER

Speakers:

Impedance:

Maximum power

handling capacity:

FM; 87.6

108 MHz

AM; 526.5

1,606.5

kHz

Compact cassette tape

100 Hz

10,000 Hz

36 dB

0.2% (WRMS)

10 cm

(4”)

woofer

Horn type tweeter

4 ohms

(maximum)

batteries Specifications for this model are subject to change without

prior notice.

STRINGING

DIAL

CORD

Dial

Cord Assembly

(201)

1. Wind the dial cord over the tuning control and attach the

tuning control to the front cabinet.

2. Set the dial cord over the boss (A).

3. Set the dial cord over the bosses (B) and

(C).

(A)

Tuning control shaft (Knob)

(215)

Dial

Poind

&kg

Point

(209)

Figure

-2-

NAMES

PARTS

Cassette Compartment

2. Headphone Jack

3. Volume Control

4. Balance Control

Power Indicator

6. FM Stereo indicator

7. Tuning Control

8. Function Selector Switch

9. Record Button

10.

Play Button

11. Rewind Button

12. Fast Forward Button

13. Stop/Eject Button

14. Pause Button

15. Graphic Equalizer Control

16. Speaker Cord Holder

17. Speaker Release Lever

18. External Microphone Jack

19. External Speaker Terminals

20. Telescopic Rod Antenna

Battery Compartment

22.

AC Power Supply Socket

234

21 22

Figure

Figure 3-2

-3-

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

out

the

unit.

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

removed

when

disassembling

the

unit.

After

servic-

ing

the

unit,

be sure

rearrange

the

leads

where

they

were

before disassembling.

4. Take sufficient care on static electricity of integrated cir-

cuits and other circuits when servicing.

STEP

REMOVAL PROCEDURE

FIGURE

Main

body

section

Front

Cabinet

Battery

comparment

lid

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

(Atxl

Open

the

cassette

holder

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

(B)

Screw

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

(C)x5

4-l

Mechanism

Block 1.

Screw

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

(01x2

Socket..

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

tE)x2

Tip

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

(F)x2

Main

P.W.Board

~,“~o~d;,,,,a,k.~,l,,tbr(G)xl

sprmg......................... (Hlxl

4-2

4-3

Speaker

section

/II

Front

Cabinet

Screw

(11x5

4-4

Note:

Set the mechanism in such a way as that the record/playback

selector lever is

positioned

shown

Fig.

4-2.

Front

Cabinet

Figure

Figure 4-4

Record/Playback

Selector

Lever

\/-----I

8mm

Figure 4-2

Figure 4-3

Switch

:/PB

Head

(I)

25mm

-4-

SWIOI-A-F

FUNCTION SELECTOR SWITCH

SWIOZ-A-J

RECORD/PLAYBACK SWITCH

Figure 5 BLOCK DIAGRAM

-5-

CIRCU

ADJUSTMENT

(TUNER SECTION

IF/RF

ADJUSTMENT

Ckcilloscope

Test AM

SWITCH

POSITION

SIGNAL

400

Hz, 30%. AM modulated

GENERATOR

TEST

FRE- DIAL AD-

STEP STAGE QUENCY POINTER

JUST-

REMARKS

SETTING MENT

IF 455 kHz

High

Adjust for

frequency best “IF”

we.

510

kliz

Lowest L8

Band frequency Adjust for

coverage maximal

1,650

Highest

TC8 output.

kHz frequency

Repeat steps 2 and 3 until no further improvement can

Figure

1 AM IF

455

kHz

Figure

2 AM IF CURVE

Signal

Generator Test

Loop Bar Antenna

Figure 6-3 AM RF

Figure

4 ADJUSTMENT POINTS

-6-

FM IF/RF ADJUSTMENT

10.7 MHz

Oscilloscope

FM mono

WITCH

?OSITION

SIGNAL

GENERATOR

400 Hz, 30%. FM modulated.

;TEP

TEST

STAGE

AD-

JUST-

MENT

REMARKS

1. Using a

minus

driver, turn

the core of

counter-

clockwise

before taking

it out of the

bobbin.

2. Adjust for

best

“IF”

curve.

Adjust for best

“S” curve.

Figure 7-l FM IF

-Y-

-%f

MHz High

frequency

Figure 7-2 IF CURVE Figure 7-3 FM

CURVE

Detection

Electronic

Repeat steps 1 and 2 until no further improvement can

Signal

External Voltmeter

Rod Antenna

Generator Speaker

Terminal

‘I

Unit

be made.

Band

frequency

coverage

109 MHz

Highest

TC2 maximal output.

frequency

Repeat steps 4 and 5 until no further improvement can

be made.

88 MHz

88MHz

L2 Adjust for

Trackmg maximal

108 MHz 108 MHz

TCl

output.

Repeat steps 7 and 8 until no further improvement can

be made.

Dummy

(See Figure

7-6)

Figure 74 FM RF

Electronic

Signal

Generator Rod Antenna

VCO FREQUENCY ADJUSTMENT

Dummy

(See

Figure

7-6)

GN/D

SIGNAL

400 Hz, 30%. FM modulated

GENERATOR

(mono signal)

Figure 7-5 VCO FREQUENCY

To Telescopic Rod Antenna

FM mono position

98 MHz at 98 MHz

60 dB

FM stereo position (unmodulated)

VRl

Adjust for

38.00

kHz

+100 Hz. To Chassis

GND

500hms

OhmsLR2

ohms

Output impedance of signal generator

Figure 7-6 FM DUMMY

-7-

CIRCUIT

ADJUSTMENT

(AUDIO

SECTION)

SETTING . Volume control. Maximum

POSITION

Graphic

equalrzer

control: Center

OF SWITCH

Balance control. Center

AND KNOB

Function selector

switch:

Tape

ITEM INPUT

ADJUST-

MENT REMARKS (CHECK)

POINT

PLAY BACK Test tape (1.2 V

dB)

AMPLIFIER MTT-118

SENSITIVITY

ITEM JIG

Driving

power

z&fjq

Torque

meter

Play

TW-2111

Fast-forward

TW-223 1

Rewind

TW-223 1

Azimuth

Tape

speed

ADJUSTMENT

POINTS

Test Tape

MTT-113C

Azimuth

adjusting screw

External Oscilloscope

Test Tape

MTT-118

Head

Figure

PLAYBACK AMPLIFIER SENSITIVITY

MECHANICAL

ADJUSTMENT

Ruba3Ks

(CHECK)

(More than 140

(Play:

g-m)

(Fast-forward:

IlOgcm)

(Rewind:

55-

1lOgcm)

Sine waveform

attains the

maximum.

3,000

*90

Test

MTT-1

E.V:

ELECTRONIC VOLTMETER

Dual-trace

External Svncroscope

‘ape

13C

Head

Figure

8-2

AZIMUTH

External

Speaker

Test Tape

MTT-111

, Record/Playback

Head

Figure

TAPE

SPEED

-8-

44,

&,.49

]

57x3

;c.

60mm

103

-‘\,-&

/’

‘1

‘.

203

/204(LEFT)

205fRIGHTl

/ii&

214x6

605

GRAPHIC

EOALIZER

PWB-B

‘“T

238

Figure

CABINET EXPLODED VIEW

-,_

---

._..

---..---.._--

-__.

-...

-~__--_---

I__.

-III--2

.---_..

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