Sharp QT-50Z Manual de usuario

SHARI=

SERVICE MANUAL

!34429QT-50ZW/

QT-50Z(VV)

QT-50Z(P)

QT-50Z(GR)

Photo: QT-502(W)

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

original condition and only parts identical to those pacified be

used.

Page

SPECIFICATIONS..

.............................................2

NAMES OF PARTS ..............................................2

DISASSEMBLY .................................................3

VOLTAGE SELECTION ...........................................3

STRINGING OF DIAL CORD......................................4

MECHANICAL ADJUSTMENT ......................................4

CIRCUIT ADJUSTMENT ........................................

5,6

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

7,8

NOTES ON SCHEMATIC DIAGRAM. .................................9

WIRING SIDE OF

P.W.BOARD

..................................9,

EXPLODED

VIEW............................................11,12

REPLACEMENT PARTS LIST ..................................13

INDEX

CONTENTS

-T

SHARP

CORPORATION

GENERAL

Power source:

Output power:

Semiconductors:

Dimensions:

Weight:

FOR A COMPLETE DESCRIPTION OF THE OPERATION OF THIS UNIT,

PLEASE REFER TO THE

OPERATlON

MANUAL.

SPECIFICATIONS

TAPE RECORDER

ACllOV-127Vand220V-

240 V,

50160

(UM/SUM-2

RI4

type

x6)

MPO; 7.2 W

(3.6W

3.6W)

(AC operation)

RMS;

4.6 W(2.3

+2.3 W)

(DC operation, 10% distortion)

PMPO; 14

+7 W)

(AC operation)

ICS

1 Transistors

10 Diodes

2 LEDs

Width; 402 mm

(15-I

3/l

6”)

Height; 137 mm

(5-7/16”)

Depth; 81 mm (3-31’16”)

1.7 kg (3.75

Ibs.)

without batteries

Tape: Compact cassette tape

Frequency range: 50 Hz

10,000 Hz

Signal/noise ratio: 36

Input impedance: External mic; 600 ohms

Output level and

loaded impedance: Headphones; 8 ohms

32 ohms

RADIO

Frequency range: AM; 526.5

kHz

1606.5

kHz

SW,;

2.3 MHz

7.3 MHz

;

7.3 MHz

22 MHz

FM; 87.6 MHz

108

MHz

SPEAKERS

Speakers:

9 cm

(3-l/2”)

Specifications for this model are subject to change without

prior notice.

Volume Control

Balance Control

3. Tone Control

4. Function Selector Switch

Pause Button

6. Stop/Eject Button

7. Fast Forward Button

8. Rewind Button

9. Play Button

10. Record Button

11. FM Mode Selector

12. Band Selector

NAMES

PARTS

13. Tuning Control

14. Power Indicator

15. FM Stereo Indicator

16. Digital Tape Counter and Counter Reset Button

17. Cassette Compartment

18. Fine Tuning

19. Built-in Microphone

20. External Microphone Jacks

21.

FM/SW

Telescopic Rod Antenna

22. Headphones Jack

23. AC Power Supply Socket

24. Battery Compartment Lid

Figure 2-l FRONT PANEL Figure 2-2 REAR PANEL

This unit is provided with a carring belt, but it is not depicted in the following Figures.

-2-

DISASSEMBLY

This unit is provided with a carring belt, but it is not

depicted in the following Figures.

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.

STEP

REMOVAL

PROCEDURE

Front cabinet 1. Battery compart-

ment lid. . . . . .

(A)

ZScrew..

. . . .

(B)x6

3. Open the cassette

holder. . . . . .

(C)

4. Open the

Mechanism block 1. Tape counter drive

Main

P.W.Board

cabinet . . . . . . (D)

5. Socket. . . . . .

(E)

belt . . . . . . . .

(F)

2. Screw . . . . .

IG)

3. Socket. . . . (HI

l.Screw.

. . . . . .

(11x8

2. Tip. . . . . . . .

(J)

3-2

3-3

3-4

Set the mechanism in such a way as that the record/play-

back selector lever is positioned as shown in Fig. 3-5.

Figure 3-5

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.

Figure 3-l

Figure 3-2

fFixl

Mechanism Block

(Glx2

Figure 3-3

Main

P,W.B.

Record Playback Selector Spring

Figure 3-4

-3-

STRINGING

DIAL

CORD

Pulley

(227)

1. Turn the drum fully in the direction A shown in Fig.

4-1

and stretch its cord over the parts in the numerical order.

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

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

Figure 4-l

MECHANICAL ADJUSTMENT

E.V:

ELECTRONIC VOLTMETER

DUAL-TRACE

NCROSCOPE

ITEM USING JIG

ADJUSTMENT REMARKS (CHECK)

POINTS

More than 150

Tape

tention

megurering

cassette

TW-2412

Torque meter

Play

-rw-2111

Fast-forward

TW-2231

Rewind

TW-2231

Driving

power

Torque

(Play:

30-60

g-cm)

(Fastforward

80-140

g-cm)

(Rewind

80-l

40 g-cm)

HEADPHONES

JACK

IRIGHT)

Figure 4-3 AZIMUTH

RECORD/PLAYBACK HEADPHONES

..-..

FRECXJENCY

HEAD

.lAtiK

PLAY BACK

COUNTER

Azimuth

Tape

spa&

TEST TAPE

m-r-1

Figure 4-4 TAPE SPEED

TEST TAPES

TORQUE METER

FOR

COMPACT

CASSETTE COMPACT

CASSETTE TYPE

TITLE

FLUTTER

MODEL

FREQUENCY/

LEVEL APPLICATION

Tape

speed,

MTT-111

kHr,

-10

Wow and flutter

check

MODEL MEASUREMENT

RANGE APPLICATION

TW-2111

lo-

16Ogcm

Normal

Playback torque

1.5-log-cm

Normal

Back

tension

TW-2121

lo-

1OOgcm

Reverse

Playback torque

1.5

log-cm

Reverse

Back tension

TW-223 1

200 g-cm Fast-forward, Rewind torque AZIMUTH

MTT-113 6.3 kHz,

-10

MTT-113C

8 kHz, -10 d6

Head

arimuth

MTT-I 14

kHz, -10 d6 adjustment

DISTORTION

MTT-118

1 kHz, -10

Distortion check

level adjustment

TW-2412

o-3oog

TW-2422

o-3oog

Normal

Driving power

Reverse

Driving power

U&‘L’ELI

MTT-150

Dolby

B-Type

DoIN

B-type

Tone 200

m&/m

level adlustment

BLANK MTT-502 Record frequency

check

-4-

SE-ll-ING

Volume control: Maximum Balance

controk

Center

POSITION OF

Tonecontrol:CenterFunctionselector switch: Tape

SWlTCH

AND

KNOB

ITEM

INPUT

ADJI.$-

REMARKS (CHECK)

(

PLAYBACK AMP- Test

tape

LIFIER

1.35v

SENSITIVITY

NTT-11

LF/RF

ADJUSTMENT

CIRCUIT

ADJUSTMENT

(TUNER

SECTION)

IIGNAL

GENERATDR

400 Hr. 30%. AM modulated

FRE-

DIAL

TEf

SyAyE

QUE-

POINTER

JUST-

REMARKS

NCY SElTlNG

MENT

AM RF

SWt

SWz

Figure 5-l PLAYBACK AMPLIFIER SENSITIVITY

Lowest

2.25

Band

MHZ

frequency

coverage

87.4MHz Highest

frequency TC4 Adjust for

maximal output.

2.6 MHz

Tracking

10 6.0 MHz

6.0 MHz

TC3

Repeat steps

7,B,9

and 10 until no further

improvementcanbemade.

Figure 5-2 AM IF

Figure 5-3 AM RF

Figure 5-4 SW RF

FM IF/RF ADJUSTMENT

FM mono

4OOHz.

30%. FM modulated

DIAL

‘OINTEF

;ElTlNG

High

frequency

‘ur

until no

turn the core of

counter-clockwise

before taking it out

this bobbin.

2.Adjust for best “IF”

Figure 6-l FM IF

10.7

-%7-

curve.

IAdjust

for

best”S’

curve.

ther improvement can be made.

Lowest

frequency

10.7 MHZ

Highest

Adjust for maximal output

Figure 6-2 FM “IF” CURVE Figure 6-3 FM “S” CURVE

88 MHz

108

MHz

IRepeat

steps

and

7untilnofurtherImprovementcanbemade

GND GNO

VCO FREQUENCY ADJUSTMENT

Figure 6-4 FM RF

SIGNAL GENERATOR

400 Hz, 30%. FM unmodulated

(monosignal)

DIAL

FREQUENCY POINTER

ADJUST-

MENT

REMARKS

SETrING

IC3

SlGNAL

GENERATOR

FREO"UENCY

COUNTER

(See

c&e$-6)

Figure 6-5 FM STEREO

FM mono position

98 MHz at 54

98 MHz

FM stereo position

(unmodulated)

VRl

Adjust for 19.00

kHz

200

Hz.

Figure 6-6 FM DUMMY

TPl

Figure 6-7 ADJUSTMENT POINTS

-6-

5I6

MAIN P.W.B. CIRCUIT

&TX

.:“p

iMYl

.oz

CC”1

NOTES ON SCHEMATIC DIAGRAM can be found on page 9.

Figure 7

SCt-

-7-

I I

MAIN PWB

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 electrolytic 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.

(

AM mode

Marking except for

(1:

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 “

A”

(

-,‘)

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.

Figure 9 WIRING SIDE OF

-9-

--+

-o-

the

this

main-

parts

per-

SIDE

P.W.BOARD

-lO-

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