Sharp GF-4646 Manual de usuario

SHARP

SERVICE MANUAL

#!I

OUTSTANDING RECEPTION THE WORLD OVER

ATSM682082RCS

.(PHOTO:

GF-4646)

GENERAL

Power source:

(GF-4646)

(GF-4646A)

Speakers:

Output power:

(GF-4646)

Output power:

(GF-4646A)

Semiconductors:

Dimensions: Width;

Depth;

Height;

Weight:

GF-4646

GF-4646A

In the interests of user-safety the set should be

restored to its original condition and only parts

identical to those specified be used.

For the mechanical adjustment, refer to the

RD-

620/A Service Manual already issued.

SPECIFICATIONS

AC 120V

60Hz

(“D”

type x6)

AC 240V

50/60

(UM/SUM-1

type x6)

10 cm

(4”)

woofer x2

Ceramic type tweeter x2

MPO;

3.9W

(1.95W

1.95W)

(AC operation)

PMPO;

IOW

(5W +

5W)

(AC operation)

MPO;

7.2W

(3.6 +

3.6W)

(AC

operation)

TAPE RECORDER

Tape: Compact cassette tape

Frequency response:

50Hz

10,OOOHz

Signal/noise ratio:

45dB

Input sensitivity and impedance:

External mic.; 600 ohms

Loaded impedance:

Headphones; 8 ohms

25 ohms

RADIO

Frequency range: FM; 87.6 MHz

108 MHz

AM; 525

kHz

1,605

kHz

RMS;

4.6W

(2.3 +

2.3W)

(DC

operation, 10% distortion)

ICS

4 transistors

11 diodes

2 LEDs

426mm

(16-3/4”)

96mm

(3-3/4”)

‘212mm

(8-3/8”)

2.8 kg (6.1 tbs.) without batteries

Specifications for this model are subject to change without

prior notice.

SHARP

CORPORATION

SHARP ELECTRONICS

CORPORATION

FOR A COMPLETE DESCRIPTION OF THE OPERATION OF THIS UNIT,

PLEASE REFER TO THE OPERATION MANUAL.

NAMES

PARTS

1. Built-in Microphone (L-ch)

2. Power/Battery indicator

3. FM Stereo Indicator

4. Band Selector

5. Function Selector

6. Volume Control

7. Tone Control

8. Balance Control

9. Tuning Control

10. Telescopic Rod Antenna

11. Built-in Microphone (R-ch)

12. Headphones Jack

13.

14.

15.

16.

17.

18.

19.

20.

21.

22.

23.

Figure 2-l

AC Power Supply Socket

Cassette Holder

Record Button

Rewind Button

Playback Button

Fast-forward Button

Stop Button

Eject Button

Beat Cancel Switch

External Microphone Jacks

Battery Compartment Lid

22 23

Figure 2-2

POWER

SUPPLY

CORD

QACCL0050AFOO

(GF4646A)

QACCDOOSI

AFOO (GF-4646)

DISASSEMBLY

Caution:

Prior to the disassembly, be sure to remove the AC power

supply cord, cassette tape and batteries from the unit.

FRONT CABINET REMOVAL

(Refer to Figures 3-l and

3-2)

1. Remove the six screws

and the six knobs

2. Push the eject button to open the cassette holder.

3. Pull the front cabinet frontward by holding its upper

part and disconnect the three tips

MECHANISM BLOCK REMOVAL

(Refer to Figure 3-2)

1. Remove the three screws

2. Disconnect the two sockets

3. Unsolder the two tips

, then the mechanism block

can be removed.

MAIN P.W.B. REMOVAL

(Refer to Figure 3-3)

Remove the eleven screws

2. Remove the LED P.W.B. from the two stoppers

then the main P.W.B. can be removed from the back

cabinet.

. POWER P.W.B. REMOVAL

(Refer to Figure 3-3)

1. Remove the three screws

2. Remove the battery spring

, then the power P.W.B.

can be removed from the back cabinet.

Figure 3-l

-a,.

Figure 3-2

Figure 3-3

DIAL

CORD

STRINGING

1) Turn the drum fully clockwise and stretch its cord cover

the parts in the numerical order-as shown in Figure 3-4.

2) Turn the tuning control shaft fully counterclockwise, and

Dial Cord Wheel

92LWHEL197A

fix it with the pointer aligned with the zero (0) point on

the frame. See Figure 3-5.

Pklley

92LROLL009

92LPINT197A

Figure 3-4

turns

Figure 3-5

-3-

Ripple Filter

Figure 4 BLOCK DIAGRAM

-4-

MECHANICAL

ADJUSTMENT

Except for the following item, refer to the

RD-620/A

Service

Manual already issued.

RECORD/PLAYBACK HEAD AZIMUTH ADJUSTMENT

As shown in Figure

5-1,

make connection of instrument,

and adjust the head azimuth adjusting screw so that the

T~~~~-~~~~~

output signals from both channels will have maximum

waveform with the same phase in right and left.

HEAD

SPEAKER

(+l

Figure 5-l

Should it become necessary at any time to check the align-

ment of this receiver, proceed as follows;

1. Set the volume control

(VR103)

to maximum.

2. Attenuate the signals from the generator enough to swing

the most sensitive range of the output meter.

3. Use a non-metallic alignment tool.

4. Repeat adjustments to insure good results.

5. Set the Function Selector Switch (SW102) to “radio”

position.

AM IF/RF ALIGNMENT

Set the signal generator to produce a signal of

400H2,

30%,

AM modulated.

For adjustments in steps 4, see

[Note1

STEP

EAND

STAGE

QUEN-

SETT- MENT

TEST FRE- DIAL ADJUST-

REMARKS

CY ING

IF (As shown in Figure 5-2, make connection of instruments.)

I I I I

1 1

RF (As shown in Fiqure 5-3, make connection of instruments.)

Repeat steps

2.3.4

and 5 until no further improvement

can be made.

GENERAL

ALIGNMENT

INSTRUCTION

Figure 5-2

ELECTRONIC

VOLTMETER

SIGNAL

GENERATOR

TEST LOOP

Figure 5-3

(Note/

Check the alignment of the receiver antenna coil by

bringing a piece of ferrite (such as a coil slug) near the antenna

loop stick, then a piece of brass. If ferrite increases output,

loop requires more inductance. If brass increases output, loop

requires less inductance. Change loop inductance by sliding the

bobbin toward the center of ferrite core to increase inductan-

ce, or away to decrease inductance.

FM IF/RF ALIGNEMNT

Set the signal generator to produce a signal of

400Hz,

30%,

FM modulated.

TESTFRE- DIAL

AD-

STEP BAND STA-

QUEN-

SET- JUST- REMARKS

TING

MENT

(As

shown in Figure

6-1,

make connection of instruments.)

Output

6Repeat steps

2.3.4

and 5 until no further improvement

can be made.

FM STEREO

ALIGNEMNT

Set the Band Selector Switch

(SWI)

to “FM” position and

Function Switch

(SW102)

to “stereo” position.

As shown in Figures 6-3 and 6-4, make connection of

instrument.

FREQUENCY DIAL

ADJUST-

POINTER MENT REMARKS

98MHz

(54d8)

un modulated

98MHz

VI31 Adjust for

0.15kHz

Telescopic Rod

Anrenna

Figure 6-4 FM DUMMY

VP1

MH*,

oscILLOSCOPE

“S”Cuwe

FM SWEEP

GENERATOR

ITPZI

lTP5l

Figure 6-l

ELECTRONlC

VOLTMETER

Figure 6-2

STEREO ITPl

)

SIGNAL

GENERATOR

Tele3COpbC

IC3 lTP61

FRERUENCY

Bee

Figure

641

LTPll

ITP71

DUMMY

Figure 6-3

T:,

Figure 6-5 ALIGNMENT POINTS

NOTES

SCHEMATIC

DIAGRAM

Resistor:

Unless otherwise specified all resistance in ohms,

1000

ohms

2. Capacitor:

*Unless otherwise specified all capacitance in microfarads,

Picofarads

Printed resistor

5. Parts marked with ”

”

(WJ)

are important for main-

taining the safety of the set. Be sure to replace these parts

with specified ones for maintaining the safety and perform-

ante of the set.

(CH),

(RH):

Temperature compensation

3. Voltage reading are measured with Digital

Multimeter

under

no signal condition in tape position.

(

)

AM mode

FM mode

-6-

---.--.--

_--.

ERASE

----

HEAD

RECORO,

PLAYBACK

-----

HEAD

BAR

ANTENNA

234

3456

-7-

Figure 7 WIRING

7 8 910

SF203

TWEETER

R-ch

-7

-.--Al-

MOTOOR

L---------

i--J

WIRING SIDE OF P.W. BOARD

-8-

456

1’

,’

0401

ZSC945AK

RIPPLE

FILTER

-1

0301

2SC945AK

BIAS

OSC

(Specifications or wiring diagrams of this model are subject to change for improvement without prior notice.)

3 4 56

-9-

Figure 9 SCHEMATIC

DIABf

8910

-1

INPUT

i-cn

OUTP”

1.5.

I’

’

I/\/I

.,I

X945AK

PPLE

FILTER

IATIC DIABRAM

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