Sharp QTMP-3-W Service manual
QT-MP3W
SERVICE MANUAL
No. S9632QTMP3W//
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] Mechanism Section....................................... 2-2
CHAPTER 3. BLOCK DIAGRAM
[1] Block Diagram............................................... 3-1
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.................................................7-10
PARTS GUIDE
QT-MP3W
CHAPTER 4. CIRCUIT DESCRIPTION
[1] Waveforms Of CD Servo Circuit ....................4-1
[2] IC Voltage......................................................4-3
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-MP3W
CHAPTER 1.
AudioXL-MP150Service ManualXLMP150Market
[1] Precautions For Using Lead-Free Solder
GENERAL DESCRIPTION
1.Employing lead-free solder
"AUDIO, CONTROL, RECTIFIER, CD, TUNER, TAPE 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 ser vice 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 on
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
after 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-B
PWB-C
Parts No.
92LMP300280047
92LMP300380092
92LMP301280047
92LMP300180024
92LMP300980056
92LMP301380047
AUDIO
CONTROL
RECTIFIER
TUNER
CD
TAPE
Description
1 – 1
[2] Safety Precaution For Service Manual
Precaution to be taken when replacing and servicing the Laser Pickup.
QT-MP3W
[3] Voltage Selection
[4] AC Power Supply Cord and AC Plug Adaptor
92L15124023002
/
92L15911022019
1 – 2
QT-MP3W
[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 reserves the right to make design and
specifcation changes for product improvement without prior notice. The performance specification
figures indicated are nominal values of production units .There maybe some deviations from these
values in individual units.
Tape recorder
General
■
Power source
Power
consumption
Output power
Speakers
Dimensions
Weight
Radio
■
Frequency range FM: 88 - 108 MHz
AC 110 - 127/ 220 - 240 V, 50/60 Hz
DC12V ["D" size (UM/SUM-1, R20 or HP-
2) battery x 8]
Power on: 13 W
Power stand-by: 1.4 W
RMS : 4 W (2 W + 2 W)
(DC OPERATION, 10% T.H.D)
9 cm (3-1/2") full range speaker x 2
Width: 410 mm (16-1/8")
Height: 150 mm (6")
Depth: 245 mm (9-1/2")
2.7 kg (5.9 lbs.) without battery
AM: 531 - 1602 kHz
■
Frequency response 80 - 8,000 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
D/A converter 1-bit D/A converter
Frequency
response
laser pickup
60 - 20,000 Hz
1 – 3
[6] Names Of Parts
r
21 3 4 5 6 7 8 9 10 11
QT-MP3W
Front panel
1. Cassette Compartment
2. FM Stereo Indicator
3. Folder Down Button
ON
/
4. Power on Indicator
5. Folder Up Button
6. Memory Button
7. Repeat/Random Button
8. Fast Reverse/Track Down Button
9. Fast Forward/ Track Up Button
10. Play/Pause Button
11. Stop Button
3
U
M
L
O
E
V
M
IN
MAX
X-BASS
OFFON
TAPE (STAND-BY)
CD
RADIO
FUNCTION
MIC
PAUSE
STOP/EJECT F.FWD REWIND PLAY RECORD
10 11 12 13 14 15
9
6542178
Top panel
1. Headphone Socket
2. X-Bass On/Off Button
3. Volume Control
N
I
G
N
U
T
KHz
Hz
M
1600
08
1
1400
1200
06
1
4
1000
0
1
2
10
800
00
1
00
7
AM
E
S
O
L
C
/
H
S
U
P
N
E
P
O
96
FM
0
60
2
9
0
9
530
8
8
AM
BAND
M
F
4. Function switch
5. CD Compartment
6. CD Door Open Button
7. Tuner Band Selector
8. Tuning Control
9. Build-in Mic
10. Tape Pause Button
11. Tape Stop/Eject Button
12. Tape Fast Forward Button
13. Tape Rewind Button
14. Tape Play Button
15. Tape Record Button
Back Panel
1. FM Stereo/Mono mode/Beat Cancel Selecto
2. Battery Compartment
3. Voltage Selector
4. AC Input Socket
Display
1. MP3 Indicator
2. WMA Indicator
3. Disc Play Indicator
4. Folder Indicator
5. Repeat mode Indicators
6. Memory Indicator
7. Random Indicator
1 – 4
QT-MP3W
CHAPTER 2. ADJUSTMENTS
[1] Tuner Section
Use a plastic screw driver for adjustments.
Adjust the intermediate frequency of AM and FM to the frequency of ceramic filter.
Set of unit
Supply voltage
speaker impedance
standard output
Function switch
Parts Location:
DC 12.0V
:
4ohms
:
50 mW
:
RADIO
:
T103
L101
C2
C4
T101
a. AM Adjustment
2
3
4
5
Adjusting
Circuit
IF1
Tuning
coverage
Tracking
Step
b. FM Adjustment
Step
Adjusting
Circuit
C1
L102
C3
Band switch: MW
Connections
Input Output
Closed the output Connect sweep
termial by sweep generator to 465 KHz Low T103
generator, it place
to MW ANT
Connect AM SG to Connect VTVM to
test loop speaker terminals.
Connect AM SG to Connect VTVM to
test loop speaker terminals.
IC101(17) PIN(A)
SG Position of VTVM
Frequency Tuning dial Oscilloscope
522 KHz Low end T101
1620 KHz High end C4
600 KHz 600 KHz MW ANT COIL Max.
1400 KHz 1400 KHz C3 Max.
Adjustment
Band switch: FM FM Dummy antenna: 75 ohms unbalance
Connection
Input Output
SG Position of VTVM
Frequency Tuning dial Oscilloscope
Adjustment
2
3
4
5
Tuning
coverage
Tracking
Connect FM SG to Connect VTVM to
FM.ANT & D101(-) speaker terminals.
Connect FM SG to Connect VTVM to
FM.ANT & D101(-) speaker terminals.
87.35 MHz Low end L102
108.25 MHz High end C1
90.0 MHz 90.0 MHz L101 Max.
106.0 MHz 106.0 MHz C2 Max.
2 – 1
[2] Mechanism Section
1 HEAD AZIMUTH ADJUSTMET
( 1 )Load the test tape TCC-182A 8KHz for azimuth
adjustment.
( 2 )Press the PLAY button.
( 3 )Use a cross-tip screwdriver to turn the screw for azimuth
adjustment so that the left and right output are maximized.
( 4 )Press the STOP button.
( 5 )After completion of the adjustment. Use thread lock (TB-1401B)
to secure the azimuth-adjustment screw.
2 AC BIAS FREQUENCY ADJUSTMENTS
( 1 )Connect frequency counter to CN201 (BS).
( 2 )R/P swith in recording state.
( 3 )Adjusting T201 use a plastic screwdriver, AC bias frepuency; 62+-1KHZ.
QT-MP3W
3 TAPE SPEED ADJUSTMENT
( 1 )Insert the test tape (MTT-111N,3,000 HZ).
( 2 )Press the PLAY button.
( 3 )Use a flat-tip screwdriver to turn the MOTOR VR.
Adjust MOTOR VR so that the frequency counter
become 3,000Hz.
CASSETTE MECHANISM SECTION
CASS DECK
2 – 2
QT-MP3W
Ө
HEAD AZIMUTH ADJUSTING SCREW
Tape recorder section
Items
Confirmation
of head angle
Confirmation Adjust VR401 so that the frequency counter
of tape speed
Reference Values for Confirmation Items
Measurement
conditions
:Test tape
TCC-182A (8KHz)
:Measurement output
terminal
Speaker terminal
Sparker R
(Load resistance:
8Ө
)
Headphone terminal
:Test tape
TCC-112 (3KHz)
:Measurement output
terminal
Headphone terminal
1 Playback the test tape TCC-182A (8KHz) Maximum Adjust the head
left and right output levers become
maximum, After adjustment, lock the head
azimuth at least by half turn.
playing back the test tape TCC-112 (3KHz)
with ending forward winding of the tape.
Measurement method
Standard
Values
output azimuth screw
Tape speed MOTOR VR
of deck
:3,010Hz
+/-15Hz
Adjusting
positions
only
Items
Wow & flutter When the test tape TCC-112 (3KHz) has
Measurement
conditions
:Test tape
TCC-112(3KHz)
:Measurement output
terminal
Headphone terminal
Measurement method
been mechanism at the beginning of
forward wow & flutter should be 0.25% or
less (WRMS).
Standard
Values
0.25% or
less
(WRMS)
Adjusting]
positions
2 – 3
Electrical Performance
QT-MP3W
Items
Adjustment of
recording bias
current
(Reference
Value)
Adjustment of
recording and
playback
frequency
characteristics
Measurement
conditions
:Mode
Playback mode
Recording mode
:Test tape
TDK-D60
:Measurement
output terminal
Both recording and
headphone
terminals
:Reference frequency
1KHz and 8KHz
(REF.:- 10dB)
:Test tape
TDK-D60
:Measurement
input terminal
OSC IN
Standard Adjusting
Values
1 With the recording and playback
mechanism, load the test tapes
TDK-D60, and set the mechanism to the
recording and pausing condition in advance.
2 After connecting 100 in series to the
recorder head, measure the bias current
with a valve voltmeter at both of the
terminals.
1 With the recording and playback Output
mechanism, load the test tapes (TDK-D60) deviation
and set the mechanism to the
recording and pausing condition in
advance.
2 While repetitively inputting the reference
frequency signal of 1KHz and 8KHz from
OSC IN, record and playback the tape.
3 While receding and playback the test tape
Lch and Rch so that the output
deviation between 1KHz and 8KHz
becomes -1dB +/-2dB.
TDK-D60
4.5
A
+/-0.5 A
between
1KHz and
8KHz
:-1dB +/-2dB
positions
Reference Values for Electrical Function Confirmation Items
Items
Recording
bias
frequency
Measurement
conditions
Playback
:Test tape
TDK-D60
:Measurement
terminal
BIAS TP on
P.C. board
1 While changing over to and form BIAS 1
and 2, confirm that the frequency is
changed.
2 With the recording and playback
mechanism, load the test tape.
(TDK-D60), and set the mechanism to the
recording and pausing condition in advance.
3 Confirm that the BIAS TP frequency on the
P.C. board is 62KHz +/-6KHz.
Measurement method
Standard Adjusting
Values positions
62KHz T201
+/-6KHz
2 – 4
QT-MP3W3
CHAPTER 3. BLOCK DIAGRAM
A
B
C
D
E
F
G
H
1
23456
Figure 1: BLOCK DIAGRAM (1/2)
3 – 1
QT-MP3W
7
8 9 10 11 12
Figure 2: BLOCK DIAGRAM (2/2)
3 – 2
QT-MP3W4
CHAPTER 4.
CIRCUIT DESCRIPTION
[1] Waveforms Of CD Servo Circuit
< Z1 : 2.5M > < Z1 :1 00K >
IC902 19
1
CH1 10:1
1.00 V/div
DC Full
< Z1 : 2M > < Z1 : 2M >
IC901 24
2
CH1 10:1
2.00 V/div
DC Full
CH 4
Display500ms/div
ONOFF
Position
-0.20div
Coupling
DC1M
Probe
10:1
Offset
0:32 V
Bandwidth
Full
Edge CH4
Auto
0.50 V
100ms/div 1s/div
Freq (C1)
50.00000kHz
Edge CH4
Auto
0.50 V
2
5
1
4
3
IC901 24
IC902 10
IC902 19
IC902 24
IC902 4
CH1 10:1
1.00 V/div
DC Full
CH1 10:1
2.00 V/div
DC Full
Freq(C1) *****
Freq(C1)
FR-A(C4)
CH2 10:1
2.00 V/div
DC Full
40.00000kHz
43.75492kHz
CH3 10:1
2.00 V/div
DC Full
Freq(C2) 50.00000kHz
CH4 10:1
2.00 V/div
DC Full
Edge CH4
Auto
0.50 V
Edge CH4
Auto
0.50 V
20µs/div
MEASURE
Mode
ON
Item Setup
Delay Setup
1Cycle Mode
OFF
Time Range1
1.57000div
Time Range2
1.77000div
CH 4
Display
ONOFF
Position
- 3.00div
Coupling
DC1M
Probe
10:1
Offset
0:82 V
Bandwidth
Full
ON
6
IC901 12
˜
0.2vCH1 A>0.2µs
9
8
7
IC901 21
IC901 22
IC901 23
CH1 10:1
5.00 V/div
DC Full
CH2 10:1
5.00 V/div
DC Full
< Z1 : 25K >
CH3 10:1
5.00 V/div
DC Full
Edge CH4
Auto
0.001 kV
4 – 1
QT-MP3W
13
12
11
10
10
3
IC901 31
IC901 33
IC901 32
IC901 43
IC902 4
IC901 64
CH1 10:1
5.00 V/div
DC Full
CH2 10:1
2.00 V/div
DC Full
< Z1 : 2.5M >
CH3 10:1
2.00 V/div
DC Full
< Z1 : 2M >
CH4 10:1
2.00 V/div
DC Full
500ms/div
Edge CH4
Auto
0.50 V
1s/div
Freq (C1)
31.25000kHz
P1sN (C4)
1133
FR-A (C4)
5.891783kHz
Freq (C1)
22.22222kHz
CH1 10:1
2.00 V/div
DC Full
CH1 10:1
2.00 V/div
DC Full
Edge CH4
Auto
0.50 V
4 – 2
QT-MP3W
[2] IC Voltage
IC904
TC94A34FG TC94A58FAG
PIN PIN PIN
VOLTAGE VOLTAGEVOLTAGE
NO NO NO NO
1 1.35 33 0.00 1 3.20 1 1.64 33 1.65 1 3.54
2 3.20 34 0.00 2 1.65 2 1.64 34 1.65 2 3.56
3 0.00 35 0.00 3 1.65 3 0.00 35 1.65 3 1.65
4 0.00 36 0.00 4 1.65 4 3.14 36 1.65 4 0.00
5 0.00 37 0.00 5 1.65 5 2.70 37 0.00 5 7.10
6 3.65 38 0.00 6 0.00 6 3.20 38 1.65 6 3.20
7 0.00 39 0.00 7 2.61 7 1.10 39 1.65 7 7.70
8 3.65 40 1.35 8 0.00 8 3.20 40 3.20 8 0.00
9 3.65 41 0.00 9 1.65 9 0.00 41 1.55 9 0.00
10 0.00 42 3.67 10 1.65 10 3.65 42 1.51 10 1.65
11 0.00 43 0.00 11 1.65 11 3.65 43 0.00 11 3.56
12 0.00 44 0.00 12 1.00 12 0.00 44 3.00 12 3.56
13 0.00 45 0.00 13 3.00 13 0.00 45 1.40 13 0.00
14 0.00 46 3.67 14 1.65 14 3.24 46 0.00 14 0.00
15 1.64 47 0.00 15 1.65 15 0.00 47 1.40 15 0.00
16 1.65 48 0.00 16 1.65 16 0.75 48 1.40 16 0.00
17 0.00 49 3.66 17 0.75 17 1.64 49 3.20 17 3.56
18 1.64 50 0.00 18 1.65 18 0.00 50 2.52 18 3.56
19 1.65 51 3.66 19 1.22 19 1.50 51 0.00 19 1.65
20 0.00 52 0.00 20 1.65 20 3.23 52 1.64 20 0.00
21 1.34 53 3.66 21 2.37 21 1.00 53 1.63 21 7.70
22 0.00 54 0.00 22 0.77 22 0.00 54 1.62 22 7.70
23 0.00 55 1.35 23 1.65 23 1.55 55 1.62 23 1.65
24 0.00 56 0.00 24 0.00 24 1.65 56 1.64 24 0.00
25 0.00 57 1.36 25 3.20 57 1.64 25 1.65
26 0.00 58 0.67 26 1.65 58 1.64 26 3.57
27 0.00 59 0.80 27 1.65 59 1.64 27 3.56
28 0.00 60 0.00 28 0.75 60 1.64 28 0.00
29 0.00 61 0.00
30 0.00 62 3.66 NO 30 1.00 62 1.65
31 0.00 63 0.00 1 0.00 31 1.65 63 1.64
32 0.00 64 0.95 2 0.00 32 1.65 64 3.20
PIN
IC901 IC902
TA2157FNG
VOLTAGE
IC501
TC4052BP
PIN
VOLTAGE
3 0.00
4 0.65 NO
5 0.00 1 13.20
6 0.00 2 6.50
7 0.00 3 12.20
8 0.00 4 1.17
9 0.00 5 0.00
10 3.64 6 13.10
11 0.40 7 0.00
12 0.00 8 0.00
13 0.00 9 1.17
14 0.00 10 12.20
15 0.00 11 6.50
16 5.36 12 13.80
1.65 61 1.64
PIN
NO
VOLTAGE
IC903
MM1669A
PIN
NO
IC301
LA4227
PIN
VOLTAGE
VOLTAGE
4 – 3
QT-MP3W5
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.
REF. NO DESCRIPTION POSITION
VR301 VOLUME MAX—MIN
SW701 USB ON—OFF
SW702 CD ON—OFF
SW703 Memo / Folder ON—OFF
SW704 Repeat / Random ON—OFF
SW705 Stop ON—OFF
SW706 Play/Pause ON—OFF
SW707 Fast Reverse / Track Down / Folder Down ON—OFF
SW708 Fast Forward / Track Up / Folder Up ON—OFF
• 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.
[2] Types Of Transistor And LED
FRONT
VIEW
ECB
(S)(G)(D)
(1)(2)(3)
B764
9014C
S8050
9015C
B
(3)
TOP
VIEW
E
(1)
HY3C
HY4C
92L22708030000
92L22708050012
92L22708050001
C
(2)
FRONT
VIEW
TOP VIEW
1N4001
1N4148
5 – 1
QT-MP3W
[3] Schematic Diagram
A
B
C
D
E
F
G
H
1
23456
Figure 5-1: TUNER SCHEMATIC DIAGRAM
5 – 2
QT-MP3W
A
B
C
D
E
F
G
H
1
23456
Figure 5-2: DISPLAY SCHEMATIC DIAGRAM
5 – 3
QT-MP3W
A
B
C
D
E
F
G
H
1
23456
Figure 5-3: AUDIO SCHEMATIC DIAGRAM
5 – 4
QT-MP3W
A
B
C
D
E
F
G
H
1
23456
Figure 5-4: TAPE SCHEMATIC DIAGRAM
5 – 5
QT-MP3W
A
B
C
D
E
F
G
H
1
23456
Figure 5-5: POWER SCHEMATIC DIAGRAM
5 – 6
-MEMO-
QT-MP3W
5 – 7
QT-MP3W
A
B
C
D
E
F
G
H
1
23456
Figure 5-6: CD SCHEMATIC DIAGRAM (1/4)
5 – 8
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