Sharp GF-A2Z(S) Manual de usuario

mmM

SHARI=

SERVICE

MANUAL

S5452G

F-A2ZSl

GF-A2Z(S)

GF-A2Z(G)

In the interests of usersafety the set should be restored to its

original condition and only parts identical to those specified be

used.

Photo:

F-APZ(S)

/-INDEX

TO CONTENTS

--.

Page

SPECIFICATIONS ...............................................

NAMESOFPARTS ..............................................

VOLTAGE SELECTION ...........................................

STRINGING OF DIAL CORD .......................................

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

BLOCKDIAGRAM ..............................................

TEST TAPES FOR MEASUREMENT ..................................

MECHANICAL ADJUSTMENT ......................................

CIRCUITADJUSTMENT

........................................5-7

ACPOWERSUPPLYCORD .........................................

NOTES ON SCHEMATIC DIAGRAM ..................................

WlRlNGSlDEOFP.W.BOARD

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

.9,10

SCHEMATIC DIAGRAM ........................................

II,12

EXPLODEDVIEW..

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

13,14

REPLACEMENT PARTS LIST ....................................15-18

SPECIFICATIONS

GENERAL

Power source:

Output power:

Semiconductors:

Dimensions:

110

127V and 220

240V

DC 9

(UM/SUM-1

R20

type x6)

PMPO; 15

(7.5

7.5

(AC operation)

MPO; 8

(4w+4w)

(AC operation)

RMS; 4.6

(2.3

2.3

(DC operation

distortion)

ICs

3 Transistors

13 Diodes

LEDs

Width; 550 mm

(21-5/8”)

Height; 220 mm

(8-5/8”)

TAPE RECORDER

Tape:

Frequency range:

Signal/noise ratio:

Wow and flutter:

Input impedance:

Loaded impedance:

Headphones;

External speakers;

RADIO

Frequency range:

SPEAKER

Speakers:

Impedance:

Compact cassette tape

80 Hz

10,000 Hz

0.15

(WRMS)

External mic: 600 ohms

25 ohms

3.2

8 ohms

FM; 87.6 MHz

108

MHz

AM; 526.5 kHz

1606.5 kHz

SW1

;

2.3 MHz

7.3 MHz

SW,; 7.3 MHz

22 MHz

12 cm

(4-3/4”)

woofer x2

Horn type tweeter x2

3.2 ohms

Weight:

Depth; 130 mm (5-I

/8”)

3.6 kg (7.9

Ibs.)

without batteries Specifications for this model are subject to change without

prior notice.

SHARP CORPORATION

FOR

COMPLETE DESCRIPTION OF THE OPERATION OF THIS UNIT,

PLEASE REFER TO THE OPERATION MANUAL.

Built-in Microphone

2. Band Selector Switch

Stereo Indicator

4. Function Selector Switch

Volume Control

Balance Control

7. Fine Tuning Control

Power Indicator

9. Sound Level Meter

10.

Tuning Control

11.

Headphones Jack

12.

Cassette Compartment

13.

Record Button

14.

Rewind Button

15.

Play Button

16.

Fast-Forward Button

17.

Stop/Eject Button

18. Graphic Equalizer Controls

19. Speaker Release Knob

20. External Speaker Terminals

21.

External Microphone Jack

22. FM/SW Telescopic Rod Antenna

23.

Battery Compartment

24. Speaker Cord Holder

25. AC Power Supply Socket

NAMES OF PARTS

1234 5 6789 1011

Figure 2-l

22 23

III

24 25

Figure 2-2

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

m’:1II

of your local voltage.

Figure 2-3

STRINGING

DIAL

CORD

1. Turn the drum fully in the

direction@shown

in Fig. 2-4

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. 2-4 and fix its pointer as shown in Fig.

2-5.

Spring

with Dial Cord

(102)

451 mm

Pointer

(109)

17 mm Frame

(114)

Figure 2-5

ing Control Shaft

Figure 2-4

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 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.

iTEP

REMOVAL

PROCEDURE FIGURE1

sin

body

section:

Front cabinet

Knob . . . . . . .

(A)x4

2. Battery compartment

lid

. . . . . . . , .

03)x1

3. Open the cassette

holder . . . . . . . (C)

4. Screw . . . . . . .

(D)x5

3-l

2Mechanism block 1. Screw . . . . . . .

(E)x2

2. Socket . . . . . .

(F)x2

3-3

Graphic Equalizer 1. Screw (G)x3

P.W.Board 3-2

(“1)

3Main P.W.Board

Record interlocking

(‘1)

lever. . . . . . .

(H)xl

(‘2)

2.Socket

. . . . . .

(1)x1

4Power Bupply 1. Screw . . . . . . . (J)x~

P.W.Board 2. Battery terminal

(‘1)

spring . . . . . . .

(K)x2

paaker

section:

Front Cabinet 1. Screw , . . . . . .

(L)x5

2. Speaker Cord . .

(~)xl

3--4

-I

*I.

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

P.W.Bs

need not to be removed.

*2.

When taking the main P.W.B. out the unit, the P.W.B.

cannot be removed unless the every external speaker

terminal knobs located at the rear side are let down.

Front Cabinet

(D)x5

Figure 3-l

Graphic Equalizer P.W. Board

Figure 3-2

Vain

P.W.Board

F‘c7\

(L)‘x5

Figure 3-4

-3-

Figure 3-3

AM IF/RF ADJUSTMENT

SIGNAL GENERATOR 400 Hz, 30%, AM modulated

STEP

S;;gE

FRE-

DIAL

POINTER

A;pNy

QUENCY

SETTINGREMARKS

maximal output

2.25 MHz

Lowest

Band

frequency

coverage

7.4 MHz

Highest

TC7

frequency Adjust for

maximal

9output

2.6 MHz 2.6 MHz L7

(SWl)

Tracking

6.0 MHz 6.0 MHz

TC4

Repeat steps

78,s

and 10 until no further improvement can

be made.

SW, RF

12 7.2 MHz Lowest

i-8

Band

frequency

coverage

22.5 MHz Highest TC6

frequency Adjust for

14 -maximal output

8.5 MHz 8.5 MHz L6

Tracking

15 19 MHz

19MHz

TC3

Repeat steps

12,13,14

and 15 until no further improvement can

be made.

Sweep

generator Test loop

AM/SW

pin Oscilloscope

Figure 6-l AM IF

Figure 6-2 AM RF

8$-j

chassis

ground

Output impedance of signal generator

generator

Ext. Electronic

Voltmeter

(TP2)

Figure 6-3 SW RF

-6-

MECHANICAL

ADJUSTMENT

For the details of the test tapes used for the measurement,

refer to the Table “TEST TAPES FOR MEASUREMENT”.

E.V.: Electronic Voltmeter

ITEM

JIG

ADJUSTMENT

POINTS

REMARKS

(CHECK)

Pinch

roller

pressure

Tension gauge

Pinch roller 370

6Og

(500

9) pressure spring

If the reading

is outside the

range, replace the

pressure spring of

the pinch roller.

Driving

power Tape tention

measuring

cassette

TW-2412

(More than

150

Torque Torque meter

Play

TW-2111

Fast-forward

TW-2231

Rewind

l-W-2231

(Play:35

60 g-cm

(Fast-fo~lard:

120

g-cm)

(Rewind:

120

g-cm)

Azimuth

Tape

speed

Test tape

M-f-r-1 13C

Test tape

Ml-T-1

Azimuth Sine waveform

adjusting attains the

screw

maximum.

Variable resistor 3,000

90 Hz

on motor

Test Tape

MTT-

113C

3.2 ohmsx2

, Record/Playback

Head

Ext. Speaker

Terminal

1%ch)

Test Tape

MTT-111

Figure 5-l AZIMUTH

Ext.

Speaker

Playback Terminal

Mode

Frequency Counrer

Unit

GND

Figure 5-2 TAPE SPEED

CIRCUIT

ADJUSTMENT

(AUDIO

SECTION)

COMPACT CASSETTE TYPE

DISTORTION

DOLBY LEVEL MTT-150

CALIBRATION

FREQUENCY/ APPLICATION MODEL MEASUREMENT APPLICATION

LEVEL RANGE

3 kHz, -10 dB Tape speed,

Wow and flutter

check

TW-2111

lo-

1OOgcm Normal

Playback torque

1.5-1Ogcm

Normal

Back tension

6.3

kHz,

-10

Head azimuth

8 kHz, -10 dB adjustment

lOkHz,-1OdB

TW-2121

lo-1OOgcm

Reverse

Playback torque

kHz,

-10

dB Distortion

chech

level adjustment TW-2231

1.5

log-cm

200 g-cm

Reverse

Back tension

Fast-forward, Rewind torque

Dolby B-Type Dolby NR

Tone 200 nwblm B-type level

adjustment

TW-2412

0-300gNormal

Driving power

TW-2422

3009

Reverse

Driving power

Record fre-

quency check

SETTING

POSITION

WITCH

AND KNOB

ITEM

Volume control: Maximum

Balance control: Center

*Graphic equalizer control: Center

Function selector switch: Tape

ADJUST-

INPUT

MENT REMARKS

(CHECK)

POINT

Dscilloscop

Test Tape

MTT-118

Head

PLAY BACK Test tape

AMPLIFIER

MTT-118

(0.85

1.7V)

Figure 5-3 PLAYBACK AMPLIFIER SENSITIVITY

SENSITIVITY

TEST

TAPES FOR

MEASUREMENT

TORQUE METER FOR COMPACT CASSETTE

-5-

+G 0104

SW102-C

VR501-505l81

INWT

so301

T301

II----p

110-,27”

POWER 5cvGO

TflZNSFORMER

220-24pv

50,GoHr

SWIOI-A-D

FUNCTION SELECTOR SWITCH

L---

SW 102-A

RECORD/PLAYBACK SWITCH a-

SW30,

SWZOI-AwE

LOUDNESS SWITCH

AC/DC

SELECTOR

9”

Figure 4 BLOCK DIAGRAM

-4-

FM IF/RF ADJUSTMENT

SWITCH POSITION

SIGNAL

GENERATOR

STEf

TEST

STAGE

FRE-

QUENCY

10.7 MHz

counter-

clockwise

before taking

it out of the

bobbin.

2. Adjust for

best

“IF”

High

CUNB.

frequency

Detection

Adjust for best

“S” curve.

fepeat

steps

and 2 until no further improvement can be made,

87.1 MHz Lowest

Band

frequency

coverage

109 MHz Highest TC2

frequency Adjust for maximal

output.

88 MHz

88MHz

Tracking 108 MHz 108 MHz

TCl

Repeat steps 4, 5and 6, 7 until no further improvement can

be made.

FM mono

400 Hz, 30%. FM modulated

DIAL

POINTER

A,$;y-

REMARKS

SETTING

Using a minus

driver, turn

the core of

VCO FREQUENCY ADJUSTMENT

SIGNAL GENERATOR

400

Hz. 30%. FM modulated

(mono signal)

DIAL

FREQUENCY POINTER ADJUST- REMARKS

SETTING MENT

FM mono position FM stereo position

(unmodulated)

98 MHz at 54

98 MHz

VRI

Adjust for 38.00 kHz

1OOH.z.

Sweep

(TP2) (TP5)

Figure 7-l FM IF

later

c-:---a

(See

Figure 7-4)

generator

(TP2)

Figure 7-2 FM

“inns1

(See Figure 7-4)

(TP4)

Figure 7-3 VCO FREQUENCY

37.5 ohms

..v

”

‘3

onms-==CR2 =

ohms

To chassis

500hms

ground (TP2)

ohms<R2

ohms

Output impedance of signal generator

Figure 7-4 FM DUMMY

POWER

SUPPLY

CORD

QACCZ0059AFOO

QACCL00155AFOO

QACCZ0060AFOO

__lll_ll___llll__-l---.----~

-.-----

---_

CYI

-___pc*

Figure 8-l ADJUSTMENT POINT

NOTES

SCHEMATIC

DIAGRAM

Resistor:

To differentiate the units of resistors, such symbol as

used: the symbol

means

1000

ohm and the resistor

without any symbol is ohm-type resistor.

Capacitor:

To indicate the unit of capacitor, a symbol

is used: this

symbol

means micro-micro-farad and the unit of the

capacitor without such a symbol is microfarad. As to elec-

trolytic capacitor, the expression “capacitance/withstand

voltage” is used.

The indicated voltage in each section is the one measured

by Digital

Multimeter

between such a section and the

chassis with no signal given.

(

AMmode

Marking except for

(

FM mode

Schematic diagram and Wiring Side of

P.W.Board

for this

model are subject to change for improvement without prior

notice.

. Parts marked with

”

(

are important for main-

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

with specified ones for maintaining the safety and per-

formance of the set.

-8-

-9-

Figure

WIA

[MAIN

PWR

_--------

------

_---------

J/’

[

POWER SUPPLY

PW.B.]

’

SW3OIISClJOI

9 WIRING SIDE OF

P.W.BOARD

-lO-

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