Sharp QTMP-5-W Service manual

QT-MP5W

SERVICE MANUAL

No. S0623QTMP5W//

PORTABLE CD STEREO SYSTEM

CONTENTS

CHAPTER 1. GENERAL DESCRIPTION

[1] Precaution For Using Lead-Free Solder........1-1

[2] Safety Precaution For Service Manual..........1-2

[3] Voltage Selection...........................................1-2

[4] AC Power Supply Cord and AC Plug Adaptor.. 1-2

[5] Specifications ................................................1-3

[6] Names Of Parts.............................................1-4

CHAPTER 2. ADJUSTMENTS

[1] Tuner Section................................................2-1

[2] Tape Deck Adjustments.................................2-2

CHAPTER 3. DIAGRAMS

[1] Block Diagrams .............................................3-1

CHAPTER 4. CIRCUIT DESCRIPTION

[1] Waveforms Of CD Servo Circuit....................4-1

[2] Voltage..........................................................4-2

MODEL

In the Interests of user-safety the set should be restored to its original condition and only parts identical to those specified be used.

CHAPTER 5. CIRCUIT SCHEMATICS AND PARTS LAYOUT

[1] Notes On Schematic Diagram .......................5-1

[2] Types Of Transistor And LED ........................5-1

[3] Schematic Diagram .......................................5-2

[4] Wiring Side Of PWB ....................................5-12

CHAPTER 6. FLOWCHART

[1] Troubleshooting.............................................6-1

CHAPTER 7. OTHERS

[1] Function Table Of IC......................................7-1

[2] LCD Display.................................................7-11

PARTS GUIDE

QT-MP5W

Parts marked with " " are important for maintaining the safety of the set. Be sure to replace these parts with specified ones for maintaining the safety and performance of the set.

This document has been published to be used for after sales service only. The contents are subject to change without notice.

– 1

QT-MP5W

CHAPTER 1.

udio

L-MP150

ervice Manual

LMP150

arket

[1] Precautions For Using Lead-Free Solder

GENERAL DESCRIPTION

.Employing lead-free solder

"AUDIO, CONTROL, RECTIFIER, SPEAKER, LED, CD, TUNER, TAPE, MCU PWB" of this model employs lead-free solder. The LF symbol indicates lead-free solder, and is attached on the PWB and service manuals.The alphabetical character following LF shows the type of lead-free solder.

Example:

Indicates lead-free solder of tin,silver and copper.

2.Using lead-free wire solder

When fixing the PWB soldered with the lead-free solder, apply lead-free wire solder. Repairing with conventional lead wire solder may cause damage or accident due to cracks. As the melting point of lead-free solder (Sn-Ag-Cu) is higher than the lead wire solder by 40 C, were commend you to use a dedicated soldring bit,if you are not familiar with how to obtain lead-free wire solder or soldering bit,contact our service station or service branch in your area.

3.Soldering

As the melting point of lead-free solder (Sn-Ag-Cu) is about 220 C which is higher than the conventional lead solder by 40 C, and as it has poor solder wettability, you may be apt to keep the soldering bit in contact with the PWB for extended period of time. However, since the land may be peeled off or the maximum heat-resistance temperature of parts may be exceeded, remove the bit from the PWB as soon as you confirm the steady soldering condition. Lead-free solder contains more tin, and the end of the soldering bit may be easily corrected. Make sure to turn o and off the power of the bit as required. If a different type of solder stays on the tip of the soldering bit, it is alloyed with lead-free solder.Clean the bit afte every use of it.

When the tip of the soldering bit is blackened during use, file it with steel wool or fine sandpaper. Be careful when replacing parts with polarity indication on the PWB silk.

Lead-free wire solder for servicing

Ref No.

PWB-A1 PWB-A2 PWB-A3 PWB-A4 PWB-A5 PWB-B PWB-C PWB-E 92LMP501380017 PWB-F 92LMP502300000 MCU

Parts No.

92LMP500280046 92LMP500380047 92LMP501280003 92LMP502300000

92LMP500980004

Description

AUDIO CONTROL RECTIFIER SPEAKER

LED CD

TUNER TAPE

1 – 1

[2] Safety Precaution For Service Manual

Precaution to be taken when replacing and servicing the Laser Pickup.

Laser Diode Properties Material: AIGaAs Wavelength: 790 nm Emission Duration: continuous Laser Output: max. 0.6 mW

QT-MP5W

[3] Voltage Selection

[4] AC Power Supply Cord and AC Plug Adaptor

92L15911022019

1 – 2

QT-MP5W

[5] Specifications

FOR A COMPLETE DESCRIPTION OF THE OPERATION OF THIS UNIT, PLEASE REFER TO THE OPERATION MANUAL.

As part of our policy of continuous improvement, SHARP reservesthe right to make design and specification changes for productimprovement without prior notice. The performance specificationfigures indicated are nominal values of production units. There maybe some deviations from these values in individual units.

General

Power source AC 110 - 127/220 - 240 V, 50/60 Hz

Power consumption

Output power MPO: 5.4 W (2.7 W + 2.7 W)

Speaker type 2 way speaker system

Dimensions Width: 410 mm (16-1/4")

Weight 3.4 kg (7.5 lbs.) without battery

DC12V [“D” size (UM/SUM-1, R20 or HP-2) battery x 8]

Power on: 15 W

(AC OPERATION, 10% T.H.D) RMS: 4 W (2 W + 2 W) (DC OPERATION, 10% T.H.D)

10 cm (4") - 8 ohms x 2 - Speaker 4 cm (1 - 3/5") - 8 ohms x 2 - Tweeter

Height: 165 mm (6-1/2") Depth: 240 mm (9-1/2")

Radio

Frequency range FM: 88.0 - 108.0 MHz

AM: 531 - 1602 kHz

Tape recorder

Frequency response 80 - 8000 Hz (Normal tape) Signal/noise ratio 40 dB Wow and flutter 0.3% (WRMS) Motor DC 9 V electric governor Bias system AC bias Erase system Magnet erase

CD player

Type Compact disc player Signal readout Non-contact, 3-beam semiconductor laser

D/A converter 1-bit D/A converter Frequency

response

pickup

60 - 20,000 Hz

1 – 3

[6] Names Of Parts

QT-MP5W

1234 56789

10 11 12 13 14 15 16

Front panel

1.Random Button

2.Memory/Display Button

3.On/Stand-by Button

4.Stand-by Indicator

5.CD Stop Button

6.Tape Button

7.Tuner (Band) Button

8.Equaliser Button

9.Extra Bass Button

10.CD Play/Pause Button

11.CD Repeat Button

12.Fast Reverse/Track Down/Tuner Preset Down Button

13.Tuner Tuning Down/Folder Down Button

14.Fast Forward/Track Up/Tuner Preset Up Button

15.Tuner Tuning Up/Folder Up Button

16.Volume Up and Down Button

Top panel

1.CD Compartment

2.Tape Record Button

3.Tape Play Button

4.Tape Rewind Button

5.Tape Fast Forward Button

6.Tape Stop/Eject Button

7.Tape Pause Button

8.Cassette Compartment

MEMORY

TRACK

243

FOLDER 1P RANDOM

TRACK

WMA MP3

ROCK CLASSIC POPS JAZZ

WMA MP3

324567

314 567

kHz MHz

X BASS ST

Back panel

1.Battery Compartment

2.Beat Cancel Selector

3.AC Input Socket

4.Headphone Socket

5.Reset Switch

6.FM/AM Aerial

7.Voltage selector

Display

1.Memory Indicator

2.Folder Indicator

3.Repeat mode Indicator

4.Random Indicator

5.Track Indicator

6.WMA Indicator

7.MP3 Indicator

8.CD Indicator

9.Disc Play/Pause Indicator

10.Equaliser modes Indicators

11.Tuner Stereo Indicator

56789

1 – 4

QT-MP5W

CHAPTER 2. ADJUSTMENTS

[1] Tuner Adjustments

Use a plastic screw driver for adjustments. Adjust the intermediate frequency of AM to the frequency of ceramic filter. Set of unit

Supply voltage : DC 12V Speaker impedance : 8 ohms Standard output : 50 mW Function select : TUNER

R144

Parts Location:

L101

CT101

C129

L102

R125

a. AM adjustment Band: AM

Step

Adjusting

Circuit

1IF

Close the output

terminal by sweep

generator, it place to

AM ANT

Connections

Input Output

Connect VTVM to

C129(-)

Frequency

450 KHz 520 KHz T103

Position of

Tuning Dial

Adjustment

CT102

T102

T101

T103

VTVM

Oscilloscope

Tuning cover

3 Tracking

range

Connect AM SG to

test loop

Connect AM SG to

test loop

Connect VTVM to

R144

Connect VTVM to speaker terminals

520 KHz 520 KHz T101 VT: 1.0+-/0.05V

1710 KHz 1710 KHz VT: 7.2+-/0.5V

600 KHz 600 KHz T102

1400 KHz 1400 KHz TC102

b. FM adjustment Band: FM FM Dummy antenna: 75 ohms unbalance

Step

Adjusting

Circuit

1IF

Tuning cover

3 Tracking

range

Connect sweep

generator to C139

Connect FM SG to D102(+) & D101(-)

Connections

Input Output

Connect VTVM to

C129(-)

Connect VTVM to

R125

Connect VTVM to speaker terminals

Frequency

10.7 MHz 90.00 MHz

87.90 MHz 87.90 MHz L102 VT: 1.8+-/0.1V

107.90 MHz 107.90 MHz VT: 7.0+-/0.5V

90.00 MHz 90.00 MHz L101

106.00 MHz 106.00 MHz TC101

Position of

Tuning Dial

Adjustment

2 – 1

Max.

VTVM

Oscilloscope

Max.

[2] Tape Deck Adjustments

1. HEAD REPLACEMNET

After replacement, demagnetize the heads by using a degausser. Be sure to clean the heads before attempting to make any adjustments. All wiring should be returned to the original position after work is completed.

2. HEAD AZIMUTH ADJUSTMENT

(1) Load the test tape (STT-113CN, etc., 8 KHz) for azimuth adjustment. (2) Press the PLAY button. (3) Use a cross-tip screwdriver to turn the screw for azimuth adjustment

so that left and right output are maximized. (4) Press the STOP button. (5) After completion of the adjustment, use thread lock (TB-1401B)

to secure azimuth-adjustment screw.

3. MOTOR REPLACEMENT

4. AC BIAS FREQUENCY ADJUSTMENTS

(1) Connect counter to T801 (BS). (2) R/P switch in recording state. (3) Adjusting T801 use a plastic screw, AC bias frequency: 80 KHz.

QT-MP5W

5. MOTOR SPEED ADJUSTMENT

(1) Insert the test tape (MTT-1 11N, etc., 3,000 Hz). (2) Press the PLAY button. (3) Use a flat-tip screwdriver to turn the SVR (located inside

the rear of the motor) to adjust SVR so that the frequency

counter become 3,000 Hz.

6. CHECKING THE MECHANISM TORQUSE AND TENSION

Measurement Take-up Torque Back Tension Tape Tension

Cassette of measurement

PLAY 30 - 70 gf.cm 1.5 - 5 gf.cm 70 gf or more

F.FWD 55 gf or more ------ ------

REW 55 gf or more ------ ------

PLAY: TW-2111A

F.FWD/REW: TW-2231

PLAY: TW-2111A

Drive-power cassette

TW-2412

2 – 2

QT-MP5W

CHAPTER 3. BLOCK DIAGRAM

23456

Figure 1: BLOCK DIAGRAM (1/2)

3 – 1

QT-MP5W

8 9 10 11 12

Figure 2: BLOCK DIAGRAM (2/2)

3 – 2

QT-MP5W

CHAPTER 4.

CIRCUIT DESCRIPTION

[1] Waveform Of Servo Circuit

IC901

Vp-p=1.0 V~1.3 V

0.5 mV/div,0.5 µsec/div

4 – 1

[2] Voltage

QT-MP5W

IC901

LC78690W

PIN PIN PIN PIN PIN PIN

NO NO NO NO NO NO

1 1.63 33 0.00 65 0.00 1 0.70 33 2.40 65 4.65 2 1.60 34 0.00 66 1.81 2 1.30 34 2.40 66 0.00 3 1.66 35 0.00 67 0.00 3 1.10 35 2.40 67 4.80 4 1.72 36 3.30 68 3.30 4 0.00 36 2.40 68 0.00 5 1.70 37 0.00 69 0.00 5 4.80 37 2.40 69 0.00 6 1.70 38 1.80 70 0.00 6 2.20 38 2.40 70 1.70 7 1.70 39 3.30 71 0.00 7 2.30 39 4.80 71 0.00 8 1.70 40 0.00 72 1.39 8 0.00 40 0.00 72 0.00

9 1.70 41 3.30 73 1.39 9 2.26 41 2.40 73 0.00 10 1.70 42 0.00 74 3.20 10 2.30 42 2.40 74 3.10 11 1.70 43 0.00 75 1.56 11 4.80 43 2.40 75 0.00 12 0.00 44 3.00 76 3.10 12 1.50 44 2.40 76 0.00 13 1.70 45 4.47 77 0.00 13 4.80 45 2.40 77 4.80 14 1.70 46 3.27 78 1.56 14 1.76 46 2.40 78 3.26 15 1.67 47 2.95 79 3.20 15 4.80 47 2.40 79 4.74 16 1.60 48 3.30 80 1.62 16 4.80 48 2.40 80 4.82

IC201

BA3308 20 0.00 52 0.00 PIN 20 1.96 52 2.40 21 3.30 53 0.00 NO 21 4.83 53 2.40 22 1.66 54 0.00 1 1.80 22 0.00 54 2.40 23 1.67 55 0.00 2 0.00 23 0.90 55 2.40 24 1.67 56 0.00 3 1.90 24 2.40 56 2.40 25 1.67 57 0.00 4 0.00 25 2.40 57 2.40 26 0.00 58 0.00 5 7.60 26 2.40 58 1.05 27 0.00 59 0.00 6 1.89 27 2.40 59 4.79 28 1.19 60 0.00 7 0.00 28 2.40 60 4.79 29 1.10 61 3.24 8 1.87 29 2.40 61 2.40

.12603.303

EGATLOVEGATLOV VOLTAGE

VOLTAGE

IC701

LC87F7CC8A

VOLTAGE VOLTAGE

04.29408.47103.39406.171

04.20500.08100.00503.381

04.21508.49100.01500.091

04.22604.20365

04.23604.21358.13600.013

04.24604.22398.14691.223

IC902

LA6548

PIN PIN PIN

VOLTAGE VOLTAGE

NO NO NO NO NO

1 7.92 15 3.31 1 12.25 1 0.65 16 0.00 2 0.00 16 3.93 2 6.10 2 0.15 17 3.17 3 1.66 17 1.66 3 11.30 3 0.00 18 3.17 4 1.66 18 1.66 4 1.21 4 0.00 19 3.16 5 3.63 19 3.63 5 0.00 5 3.10 20 3.17 6 3.63 20 3.63 6 12.00 6 3.10 21 3.10 7 0.00 21 0.00 7 0.00 7 3.17 22 3.16 8 0.00 22 0.00 8 0.00 8 3.17 23 3.17

9 3.63 23 3.63 9 1.21 9 3.17 24 3.17 10 3.63 24 3.63 10 11.30 10 3.10 25 3.10 11 1.67 25 1.67 11 6.30 11 3.17 26 3.10 12 1.66 26 1.67 12 13.00 12 3.17 27 0.00

LA4227

VOLTAGE

PIN PIN

VOLTAGE

15 0.00

105CI103CI

LC75342M

VOLTAGE

1.34129.78232.741 30 0.63

01.38271.33106.17203.331

63.6927

4 – 2

QT-MP5W

CHAPTER 5. CIRCUIT SCHEMATICS AND PARTS LAYOUT

[1] Notes On Schematic Diagram

•Resistor: To differentiate the units of resistors, such symbol as K and M are used: the symbol K means 1000 ohm and the symbol M means 1000 kohm and the resistor without any symbol is ohm-type resistor. Besides, the one with “Fusible” is a fuse type.

• Capacitor: To indicate the unit of capacitor, a symbol P is used: this symbol P means pico-farad and the unit of the capacitor without such a symbol is microfarad. As to electrolytic capacitor, the expression “capacitance/ withstand voltage” is used. (CH), (TH), (RH), (UJ): Temperature compensation (ML): Mylar type (P.P.): Polypropylene type

• Schematic diagram and Wiring Side of P.W.Board for this model are subject to change for improvement without prior notice.

• The indicated voltage in each section is the one measured by Digital Multimeter between such a section and the chassis with no signal given.

1. In the tuner section,

indicates AM indicates FM stereo

2. In the audio section, a tape is being played back.

3. In the deck section, a tape is being played back.

( ) indicates the record state.

4. In the rectifier section, a tape is being played

back.

5. In the CD section, the CD is stopped.

• Parts marked with “ “ ( ) are important for maintaining the safety of the set. Be sure to replace these parts with specified ones for maintaining the safety and performance of the set.

REF. NO DESCRIPTION POSITION

SW701 Power On / Stand-by ON—OFF SW702 Fast Reverse / Track Down /

Tuner Preset Down SW703 Equaliser ON—OFF SW704 Extra Bass ON—OFF SW705 USB Play / Pause ON—OFF SW706 CD Play / Pause ON—OFF SW707 Tuner (Band) ON—OFF SW708 Tape ON—OFF SW709 Volume Up ON—OFF

ON—OFF

[2] Types Of Transistor And LED

FRONT

VIEW

E C B

(S)(G)(D)

(1)(2)(3)

(3)

(1)

A928A 9014C S8550 S8050 9015C

REF. NO DESCRIPTION POSITION

SW710 Stop ON—OFF SW711 Repeat / Random ON—OFF SW712 Fast Forward / Track Up /

SW713 Tuner Tuning Down / Folder Down ON—OFF SW714 Tuner Tuning Up / Folder Up ON—OFF SW715 Volume Down ON—OFF SW716 Memory Display ON—OFF

TOP

VIEW

(2)

HY3C HY4C

Tuner Preset Up

TOP VIEW

1N4001 1N4148

ON—OFF

FRONT

VIEW

E C B

CW7809 B1185 B772

FRONT VIEW

92L22708030000 92L22708050012

5 – 1

QT-MP5W

[3] Schematic Diagram

Figure 5-1: AUDIO SCHEMATIC DIAGRAM (1/3)

5 – 2

QT-MP5W

LED PWB-A4

Figure 5-2: AUDIO SCHEMATIC DIAGRAM (2/3)

5 – 3

AUDIO PW

QT-MP5W

IO PWB-A1

SPEAKER

PWB-E

13 14 15 16 17 18

Figure 5-3: AUDIO SCHEMATIC DIAGRAM (3/3)

5 – 4

QT-MP5W

23456

Figure 5-4: CONTROL SCHEMATIC DIAGRAM

5 – 5

QT-MP5W

PT1

AC SOCKET

(VS1)

AC SUPPLY

110-127 / 220-240V

50 / 60Hz

23456

Figure 5-5: RECTIFIER SCHEMATIC DIAGRAM

5 – 6

-MEMO-

QT-MP5W

5 – 7

QT-MP5W

CN902

TO DA11MMV

IC901

LC78690W

SW901

Limit Switch

23456

Figure 5-6: CD SCHEMATIC DIAGRAM (1/2)

5 – 8

QT-MP5W

CN903

TO MAIN PWB CN903A

CN901

TO MAIN PWB CN901A

8 9 10 11 12

Figure 5-7: CD SCHEMATIC DIAGRAM (1/2)

5 – 9

QT-MP5W

23456

Figure 5-8: TUNER SCHEMATIC DIAGRAM (1/2)

5 – 10

TO AUDIO PWB-A1

CN502

QT-MP5W

TO AUDIO PWB-A1

CN703

8 9 10 11 12

Figure 5-9: TUNER SCHEMATIC DIAGRAM (2/2)

5 – 11

+ 50 hidden pages

Sharp QTMP-5-W Service manual

Specifications and Main Features

Frequently Asked Questions

User Manual