QT-CD121
SERVICE MANUAL
No. S5831QTCD121/
QT-CD121
• In the interests of user-safety the set should be restored to its
original condition and only parts identical to those specified should
be used.
CONTENTS
Page
IMPORTANT SERVICE NOTES ........................................................................................................................................ 2
SPECIFICATIONS ............................................................................................................................................................. 2
NAMES OF PARTS ........................................................................................................................................................... 3
REMOTE CONTROL ......................................................................................................................................................... 3
DISASSEMBLY .................................................................................................................................................................. 4
REMOVING AND REINSTALLING THE MAIN PARTS ..................................................................................................... 5
ADJUSTMENT ................................................................................................................................................................... 6
BLOCK DIAGRAM ............................................................................................................................................................. 8
SCHEMATIC DIAGRAM / WIRING SIDE OF P.W.BOARD ............................................................................................. 10
NOTES ON SCHEMATIC DIAGRAM .............................................................................................................................. 16
TYPES OF TRANSISTOR ............................................................................................................................................... 16
WAVEFORMS OF CD CIRCUIT ...................................................................................................................................... 17
TROUBLESHOOTING ..................................................................................................................................................... 18
FUNCTION TABLE OF IC ................................................................................................................................................ 21
PARTS GUIDE/EXPLODED VIEW
PACKING OF THE SET
SHARP CORPORATION
–1–
This document has been published to be used
for after sales service only.
The contents are subject to change without notice.
QT-CD121
FOR A COMPLETE DESCRIPTION OF THE OPERATION OF THIS UNIT, PLEASE REFER
TO THE OPERATION MANUAL.
IMPORTANT SERVICE NOTES
BEFORE RETURNING THE AUDIO PRODUCT
(Fire & Shock Hazard)
Before returning the audio product to the user, perform the
following safety checks.
1. Inspect all lead dress to make certain that leads are not
pinched or that hardware is not lodged between the chassis
and other metal parts in the audio product.
2. Inspect all protective devices such as insulating materials,
cabinet, terminal board, adjustment and compartment
covers or shields, mechanical insulators etc.
3. To be sure that no shock hazard exists, check for leakage
current in the following manner.
* Plug the AC line cord directly into a 120 volt AC outlet.
* Using two clip leads, connect a 1.5k ohm, 10 watt resistor
paralleled by a 0.15µF capacitor in series with all exposed
metal cabinet parts and a known earth ground, such as
conduit or electrical ground connected to earth ground.
* Use a VTVM or VOM with 1000 ohm per volt, or higher,
sensitivity to measure the AC voltage drop across the
resistor (See diagram).
* Connect the resistor connection to all exposed metal parts
having a return path to the chassis (antenna, metal cabinet,
screw heads, knobs and control shafts, escutcheon, etc.)
and measure the AC voltage drop across the resistor.
VTVM
AC SCALE
1.5k ohms
10W
0.15 µ F
TO EXPOSED
METAL PARTS
TEST PROBE
CONNECT TO
KNOWN EARTH
GROUND
All check must be repeated with the AC line cord plug connection
reversed.
Any reading of 0.3 volt RMS (this corresponds to 0.2 milliamp.
AC.) or more is excessive and indicates a potential shock
hazard which must be corrected before returning the audio
product to the owner.
SPECIFICATIONS
General
Power source:
Power consumption:
Output power:
Speakers:
Output terminal:
Dimensions:
Weight:
Tape recorder
AC 120V, 60 Hz
DC 12 V [ "D" size (UM/SUM-1,
R20 or HP-2) battery x 8]
20 W
FTC; 2.0 W min. RMS per channel
into 8 ohms from 150 Hz to 20 kHz,
with no more than 10 % total harmonic distortion.
RMS; 2.3 W/CH
(DC operation, 10 % T.H.D.)
4" (10 cm) wooferr x 2
Tweeter x 2
Headphones; 16-50 ohms
(recommended 32 ohms)
Width; 18-15/16" (480 mm)
Height; 6-1/16" (153 mm)
Depth; 10" (254 mm)
7.1 Ibs. (3.2 kg) without batteries
Frequency response:
Signal/noise ratio:
Wow and flitter:
Motor:
Bias system:
Erase system:
Compact disc player
Disc:
Signal readout:
Audio channels:
Quantization:
Filter:
D/A converter:
Wow and flutter:
Compact disc
Non-contact, 3-beam semiconductor laser pickup
2
16-bit linear quantization
4-tims oversampling digital filter
1-bit D/A converter
Unmeasurable
(less than 0.001% W. peak)
Specifications for this model are subject to change without
prior notice.
Radio
Frequency range:
50 - 14,000 Hz (Normal tape)
50 dB
0.25 % (WRMS)
DC 12 V electric governor
AC bias
Magnet erase
FM; 87.6 - 108 MHz
AM; 530 - 1,702 kHz
–2–
QT-CD121
NAMES OF PARTS
1. Cassette Compartment
2. CD Compartment
3. Tuning Control
4. (TAPE) Record Button:
5. (TAPE) Play Button:
6. (TAPE) Rewind Button:
7. (TAPE) Fast Forward Button:
8. (TAPE) Stop/Eject Button: /
9. (TAPE) Pause Button:
2
1
3
4 5 6 7 8 9
10 11
10. (CD) Play Indicator:
11. (CD) Track Number Indicator
12. (CD) Repeat Indicator:
13. Volume Control
14. Function Selector/Power Switch
15. Extra Bass Button: X-BASS
16. Surround Button
17. (CD) Track Down/Review Button:
18. (CD) Track Up/Cue Button:
19. (CD) Stop Button:
20. (CD) Play/Repeat Button:
12
13 14 15 16 17 18 19 20
21
21. FM Telescopic Rod Aerial
22. Battery Compartment
23. AC Power Input Socket
24. Headphones Socket
22
3
1
1. (CD) Track Down/Review Button:
2. (CD) Pause Button:
3. (CD) Play/Repeat Button:
4. (CD) Track Up/Cue Button:
5. (CD) Stop Button:
24 23
4
2
5
REMOTE CONTROL
Notes concerning use:
Replace the batteries if control distance decreases or operation becomes erratic.
Periodically clean the transmitter LED on the
remote control and the sensor on the main unit
with a soft cloth.
Exposing the sensor on the main unit to strong
light may interfere with operation. Change the
lighting or the direction of the unit.
Keep the remote control away from moisture,
excessive heat, shock, and vibrations.
Remote Sensor
15
15
8" - 20'
(0.2 m - 6 m)
0,2 m - 6 m
–3–
QT-CD121
DISASSEMBLY
(C2)x1
Caution on Disassembly
Follow the below-mentioned notes when disassembling the
unit and reassembling it, to keep it safe and ensure excellent
performance:
1. Take cassette tape and compact disc out of the unit.
2. Be sure to remove the power supply plug from the wall
outlet before starting to disassemble 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 suffcient care on static electricity of integrated
circuits and other circuits when servicing.
STEP
PROCEDURE
FIGURE
1
Rear Cabinet
REMOVAL
1. Screw ................. (A1) x10
2. Socket .................. (A2) x1
4-1
4-2
2
Top Cabinet
1. Knob ..................... (B1) x1
(with CD Mechanism/ 2. Screw ................... (B2) x3
Tape Mechanism/ 3. Socket .................. (B3) x1
Main PWB)
4-2
3
Main PWB/
1. Screw ................... (C1) x8
Switch PWB/
2. Socket .................. (C2) x4
Headphones PWB
4-3
4-3,4-4
4
Tape Mechanism
1. Screw ................... (D1) x4
4-4
5
CD Mechanism
1. Screw ................... (E1) x3
4-4
6
Terminal PWB
1. Screw ................... (F1) x5
2. Hook ..................... (F2) x1
4-5
(C1)x7
ø3x10mm
Switch PWB
Main PWB
Headphones
PWB
Top Cabinet
(C1)x1
ø3x10mm
Figure 4-3
(D1)x4
ø3x10mm
(E1)x3
ø2.5x10mm
Front Cabinet
Tape
Mechanism
(C2)x2
Top Cabinet
CD Mechanism
(C2)x1
Figure 4-4
(A1)x6
ø3x20mm
(F2)x1
(A1)x3
ø3x12mm
Rear Cabinet
(A1)x1
ø3x12mm
Push
Figure 4-1
Top Cabinet
Driver
(B1)x1
(F1)x2
ø3x10mm
Spacer PWB
(F1)x1
ø3x12mm
(B2)x3
ø3x10mm
Main PWB
(A2)x1
Terminal PWB
(B3)x1
Headphones
PWB
Front Cabinet
(F1)x2
ø3x10mm
Figure 4-5
Figure 4-2
–4–
QT-CD121
REMOVING AND REINSTALLING THE MAIN PARTS
CD MECHANISM SECTION
Perform steps 1, 2, 3 and 5 of the disassembly method to
remove the CD mechanism.
(A1) x2
2.6 x6mm
How to remove the pickup (See Fig. 5.)
1. Remove the screws (A1) x 2 pcs., to remove the shaft (A2)
x1 pc.
2. Remove the stop washer (A3) x1 pc., to remove the gear
(A4) x 1 pc.
3. Remove the pickup.
CD
Mechanism
Pickup
Shaft
(A2) x1
Gear
(A4) x1
Figure 5
–5–
Stop
Washer
(A3) x1
QT-CD121
ADJUSTMENT
MECHANISM SECTION
TUNER SECTION
• Driving Force Check
Torque Meter
fL: Low-range frequency
fH: High-range frequency
Specified Value
PLAY: TW-2412
• FM IF/RF
Over 120 g
Specified
Value/Adjusting
Point
Test Stage
• Torque Check
Torque Meter
Specified Value
Play: TW-2111
25 to 65 g.cm
Fast Forward: TW-2231
60 to 130 g.cm
Rewind: TW-2231
60 to 130 g.cm
• Head Azimuth
Torque Meter
IF
T1
Detection
T2
Band Coverage
fL: L2
fH: TC2
Tracking
88.0 MHz: L1
108.0 MHz: TC1
Specified Value
MTT-114
Output: Speaker Terminal
(CNP201 Load resistance: 8 ohms)
Adjusting
Point
MTT-111 In motor
Specified
Value
Instrument
Connection
3,000 ± 90 Hz
Output: Speaker
Teaminal
(CNP201 Load
resistance: 8 ohms)
Input: Pin 1 of IC1
Output: Pin 17 of IC2
Test Stage
Instrument
Connection
Specified
Value/Adjusting
Point
IF
T3
Input: Antenna
Output: Pin 19 of IC2
Band Coverage
fL: L4
fH: TC4
600 kHz: L3
1,400 kHz: TC3
Input: Antenna
Output: Speaker
Terminal (CNP201
Load resistance: 8
ohms)
Tracking
TAPE SECTION
• VCO Frequency
Position of each switch or control
Volume control
Function switch
X-BASS
Iuput: Antenna
Output: Speaker
Terminal (CNP201
Load resistance: 8
ohms)
• AM IF/RF
• Tape Speed
Test
Tape
Instrument
Connection
Max
Tape/Power Off
On
Specified
Value
Adjusting Point
76 kHz ± 200 Hz
VR1
• Bias Oscillation
Adjustment Point
L301
82 kHz ± 6 kHz
Pin 2 of CNP201
• Playback Amplifier Sensitivity Check
Test Tape
Specified Value
MTT-118
1.8 V ± 3 dB
Pin 13, pin 21 and
ground of IC2
Note:
After preparing the test circuit shown in Fig. 6-1, connect the
Pin 13, Pin 21 and ground of the IC2 with the test circuit, and
measure the value. At this time, apply a standard unmodulated
signal input and adjust the VCO.
Instrument
Connection
Specified Value
Instrument
Connection
Pin 13 of IC2
Instrument Connection
Speaker Terminal
(Load resistance: 8 ohms)
G
Pin 21 of IC2
D
FET : 2SK19 or 2SK54
TO FREQUENCY
COUNTER
S
MAIN PWB
10 kohm
AM
TRACKING
fL
FM ROD ATENNA
Figure 6-1 VCO FREQUENCY TEST CIRCUIT
VR1
VCO
L
AR A3
NTE
NNA
13
FM
DETECTION
T2
17
19 IC2
T3
21
1
L4
AM B
AM IF
L2
IC1
TC4
T1
TC2
TC3
AM
TRACKING
fH
fL
fH
AM BAND
COVERAGE
FM IF
TC1
L1
fL
fH
FM
TRACKING
1
fL
fH
FM BAND
COVERAGE
Figure 6-2 ADJUSTMENT POINTS
–6–
QT-CD121
CD SECTION
Since this CD system incorporates the following automatic
adjustment function, when the pickup is replaced, it is necessary
to reajust it.
Since this CD unit does not need adjustment, the combination
of PWB and laser pickup unit is not restricted.
TEST MODE
Start
Note
Operation
While holding down the "STOP" button, move the FUNCTION/POWER switch to "CD".
Then, release the "STOP" button and, within 0.5 second, connect the TEST POINT to GND (within 0.5 second).
(See Fig. 7)
1. When the CD LID switch is in the OFF position, the unit will be able to enter the test mode.
However, playback cannot be performed in this mode.
2. You can only move the pickup.
3. The LCD display should be the same as it is for normal CD operations.
1
The use of the "UP/CUE" button will move the pickup to the outermost position.
The use of the "DOWN/REVIEW" button will move the pickup to the innermost position.
2
When the "PLAY" button is pressed, the laser will be lit, and when the "STOP" button is pressed, it will be
turned off. Playback will also start and stop when these buttons are pressed.
a. If the "PLAY" button is pressed while in the stop mode, the laser will simply be turned on at first.
b. If the laser is lit and the "PLAY" button is pressed again, playback will start from the current pickup position.
c. If the "STOP" button is pressed, playback will stop. When pressed again, the laser will be turned off.
3
Turning the tracking servo on or off.
a. Each time the PAUSE button is pressed during playback, the tracking servo will be turned on or off.
(Note: If the PLAY button is pressed while in the stop mode, the tracking servo will automatically be
turned on.)
LCD MODE
2
1
1 second
3
3
1 second
12
3
* After the number has appeared in the display, each time the "UP/CUE" button is pressed, the display will switch
in the following order: , , and then .
SWITCH PWB-A2
SW774
TRACK DOWN/
REVIEW
R771
3.9K
REMOTE
SENSOR
RX771
SW773
TRACK UP/ CUE
R772
2.7K
TEST
POINT
R773
2.7K
R774
2.7K
2
SW771
PLAY/
REPEAT
1
3
SW772
STOP
R776
10K
+B
C779
10/16
Display
While holding down the "STOP" button, move the FUNCTION/POWER switch to "CD".
Then, release the "STOP" button and, within 0.5 second, press the REVIEW/DOWN button.
R779
47
Start
4
1
TO CD SECTION
Figure 7
–7–
24
27
28
31
34
35
36
SEG4
57
~
60
SEG1
~
9
~
14 17
~
19 21
20
SL+
SL–
+5V
(D)
PU-IN SW
13
14
38
25
VLC3
VDD
SYSTEM
MICROCOMPUTER
37
LID
23
33 22
X701
4MHz
44 30
IC701
IX0105AW
41
COM3
RX771
REMOTE
SENSOR
3 2 1
RC IN
COM0
RES
PICKUP IN
SW702
Figure 8 BLOCK DIAGRAM (1/2)
–8–
M702
SLIDE
MOTOR
M701
SPIN
MOTOR
TRACKING COIL
FOCUS COIL
PICKUP UNIT
M
M
17
18
26
27
11
12
1
2
30
31
1
2
3
4
SL–
SL+
FIN2
FIN1
E
F
Q804
IC804
BA5914FP
10 19 23 25
JP–
44
43
40
32
9 EFMO
IC802
EFMIN
LCHO
CLV+ LC78622E
13 CLV– SERVO/SIGNAL
14 V/P
CONTROL
15 HFL
16 TES
17 TOFF
18 TGL
19 JP+
20 JP– RES. CQCK. COIN
SQOUT. RWC. WRQ
2 4 8 11
1 61 58 57 56 55 54 53
13
28
5
6
7
8
22
2
+7.4V
CONSTANT
VOLTAGE
REGULATOR
CL, DAT, SELIAL CONTROL
49 50 51 52 53 54
FOCUS/TRACKING
/SPIN/SLIDE
DRIVER
3
+5V
15 16 27 28 29
SLI
SLC
CV+
10
12
6
45
44
23 43
+5V
62
XL801
16.93MHz
64
IC801
LA9240M
SERVO AMP.
Q805
LASER +5V
DRIVER
LDO
VCC1
LCD701
CD LCD
K1
XIN
SL–
DRF
XOUT
CD
OPERATION
KEY
SW771~SW774
TO
FD
SPO
SLEO
SLD
XOUT
WRQ
RESET
XIN
~
VVDD
VDD
XVDD
THLD/DEF
CLK
CL
DAT
CE
DRF
CD LID
OPEN/CLOSE
SW761
46
39
38
33
32
37
64
63
62
51
+7.4V
(CD)
R-CH
GND (A)
L-CH
+7.4V (D)
GND (D)
6 POWER GND
1
2
3
4
5
TO
MAIN
SECTION
QT-CD121
Figure 9 BLOCK DIAGRAM (2/2)
–9–
L-CH
ERASE
HEAD
R-CH
REC / PB
HEAD
FROM
CD
SECTION
1
L1
FM RF
2 3
9 6
FM
+B
SW102-H
REC / PB
SW102
REC / PB
B.D
REC / PB
SW102
C,E
P.B
P.B
R-CH
1 (AUDIO GND)
2
CD
L-CH
3
+7.4V
4
+B2
5
(DIGITAL GND)
6
(POWER GND)
5
VCC
MIX
8
4
7
BIAS
OSC.
REC
P. B
SW102-G
REC / PB
8
6
R 12
9 R
IC101
EQULIZER
AMP.
BA331IL
L 1
REC
TAPE
RADIO
M601
TAPE
MOTOR
SURROUND
SW202
A,B
5
2
REG.
23
3
RF
1
22
CF
10.7MHz
IC2
LA1805
FM / AM
IF MPX.
+B1
T1
FM IF
EC / PB
SW102
A,F
POWER/
FUNCTION
SW201-A,B
5 L
C201
L201
REC
REC
P.B
L2
FM OSC
OSC
IC1
LA1186N
FM FRONT END
RF AMP
L3
AM BAR ANT.
F1
B.P.F
FM ROD ANTENNA
5
6
GND
AM - IF
SW203
A,B
+B2
STANBY
VR201
A,B
AM / FM
SELECT
+B
FM +B
14
10
5 11
6 R
2 L
8
TUNER
+B
TRIG.
VCO
ST.
SWIT.
FF
ST.
DRIV.
7
SP502
R-CH
SPEAKERS
SP501
L-CH
AC 120V
60Hz
AC INPUT
SO651
FF
FF
VCC
21
TUNER
+B
BATTERY
DC12V
[' D' SIZE (UM/SUM-1,
R20 or HP-2)BATTERYx8]
10
12
IC501
LA4597
POWER AMP.
9
DECODER
PHASE
DET.
PILOT
DET.
11 13 15
VR1
VCO
T651
POWER
TRANSFORMER
15
AM / FM
SELECT
+B
19 18
VOLUME
8
TU
DRIV.
SW201-C
POWER/
FUNCTION
+B1
12
D651~D654
RECTIFIER
IC203
KIA7808P
VOLTAGE
REGULATOR
SW601
MAIN
SW201-D
POWER /
FUNCTION
7
1
X-BASS
4
AGC
MUTE
POST
AMP.
20 17
T2
FM DET
DET.
DET.
LEVEL - DBT.
FM - IF
2
CP
455kHz
IC201
KIA4558S
6 SURROUND AMP.
L5
AM OSC
24
OSC
MPX
3
T3
AM IF
QT-CD121
QT-CD121
SWITCH PWB-A2
SW774
TRACK DOWN/
REVIEW
Q805
S9012H
+B
REMOTE
SENSOR
RX771
C849
0.022
C848
1/50
3
C779
10/16
+B
C840 0.33/50
R776
10K
+B
SW761
CD LID
OPEN/CLOSE
4
1
4
1
C835 0.1/50
SW772
STOP
C837 10/16
SW771
PLAY/
REPEAT
R842
22
1
C838 0.01
2
C839 1/50
SW773
TRACK UP/ CUE
R779
47
B
IC701
PIN VOLTAGE PIN VOLTAGE
NO.
NO.
0V
1
33 5V
0V
2
34 0V
0V
3
35 0V
0V
4
36 0V
0V
5
37 0.4V
0V
6
38 5V
3.9V
7
39 3.1V
0V
8
40 1.5V
5V
9
41 2.4V
10 4.1V
42 2.4V
11 4.1V
43 2.4V
12 0V
44 2.4V
13 0V
45 2.4V
14 0V
46 2.4V
15 0.4V
47 2.4V
16 0.4V
48 2.4V
17 0V
49 2.4V
18 0V
50 2.4V
19 0V
51 2.4V
20 0V
52 2.4V
21 5V
53 2.4V
22 2.5V
54 2.4V
23 2.5V
55 2.4V
24 0V
56 2.4V
25 5V
57 2.4V
26 5V
58 2.4V
27 0V
59 2.4V
28 0V
60 2.4V
29 5V
61 2.4V
30 4.8V
62 0V
31 0V
63 0V
32 3.8V
64 0V
R774 R773 R772 R771
1.5K 1.8K 2.7K 3.9K
A
10 11 12 13 14 15 16
R741
3.3K
Q740
2SC1815 GR
R744
R740
10K
4.7K
VCC2
FSS
CL
DEF
REFI
CLK
VR
CE
DAT
LF2
DRF
BH1
PH1
IC801
PIN VOLTAGE PIN VOLTAGE
NO.
NO.
23 2.5V
2.5V
1
2.5V
24 2.5V
2
2.5V
25 2.5V
3
2.5V
26 2.5V
4
2.5V
27 2.5V
5
28 2.5V
2.5V
6
29 2.5V
2.5V
7
2.5V
8
30 2.2V
2.5V
9
31 2.2V
10 2.5V
32 0V
11 2.5V
33 0V
34 5V
12 2.5V
35 5V
13 2.5V
36 4.8V
14 2.5V
37 0V
15 2.5V
38 5V
16 2.5V
39 0V
17 2.5V
40 0V
18 2.5V
41 1.5V
19 2.5V
42 2.4V
20 2.5V
43 2.5V
21 2.5V
22 0V
44 2.5V
R743
100K
R745
10K
D741
1N4148
CD SIGNAL
G
PIN
NO.
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
VOLTAGE
0V
2.5V
2.5V
0V
0V
2.4V
4.1V
4.7V
0V
0V
5V
5V
2.5V
2.5V
0.9V
0.9V
2.1V
4.2V
0V
5V
C820
R826 0.0033
220K
R827
220K
C821
1/50
IC802
PIN VOLTAGE PIN VOLTAGE PIN VOLTAGE
NO.
NO.
NO.
23 5V
0V
1
45 2V
0V
24 0V
46 0V
2
1.5V
25 0V
3
47 0.1V
0V
26 0V
48 2.2V
4
2V
27 0V
49 0V
5
28 0V
5V
6
50 2.5V
29 0V
0.3V
7
51 0V
0V
8
30 5V
52 2.5V
2.5V
9
31 2.5V
53 0V
54
2.5V
10
32 0V
0V
55 0V
11 0V
33 0V
34 0V
56 4.1V
12 0V
35 5V
57 4.1V
13 0V
36 4.7V
58 5V
14 5V
37 2V
59 0V
15 0V
38 0V
60 2.7V
16 4.8V
39 0V
61 2.4V
17 5V
40 2V
62 0V
18 5V
41 4.7V
63 0V
19 0V
42 0V
64 0V
20 0V
43 5V
21 2.5V
44 2.3V
22 0V
MAIN PWB(2/2)
H
• The numbers 1 to 12 are waveform numbers shown in page 17.
1
2
3
4
Figure 10 SCHEMATIC DIAGRAM (1/4)
– 10 –
5
C83
27P
(CH
R810
82K
+B
C741
3.3/50
R832
56K
R836
47K
SL+
JP–
SLD
R824
10K
C819
47/16
SL–
SPD
SLEQ
SP–
C816
0.001
R822
6.8K
R833
5.6K
30 31 32
R825
1.2K
R815 C814 R816
47K 0.01 1.5K
29
R821
56K
R817
82K
27 28
5V
DIGITAL GND
PU IN
WRQ
SQOUT
DRF
SL–
SL+
RWC
CO IN
CQCK
RES
R742
1K
C850
0.1
C822
220P
TOFF 35
34
33
+B
+B
C845
4.7/50
R835
470
CV+ 40
CV– 39
SLOF 38
HFL 37
TES 36
R715
15K
R727
1K
D740
1N4148
25 26
C811
0.1
R736
1K
R721 15K
R724 15K
24
R840
22K
X701
4MHz
+B
R716 10K
VREF
21 22 23
C812
330P
C830
2P
(CH)
R831
1K
R713
1K
R839
22K
RFSM 41
34 TGL
33 JP+
C818
1/50
GND
SLC 43
RFS– 42
TD
13
JP
14
R812 C813
R828
15K 0.1
1K
R829
1K
+B
R718 15K
R719 15K
R720 15K
R722 15K
R723 15K
R725 15K
C810
180P
R813
33K
C705
0.022
C740
0.01
15 TO
16 FD
12 TD–
15
16
+B
R726 1K
R728 1K
R729 1K
R731 1K
R732 1K
R733 1K
F
C808
0.068
17 18 19 20
R714
10K
C704
100/10
R730
1K
P33
COM2
COM3
VLC1
VLC2
VLC3
KIDSW AIN7
SIMUKE AIN6
AIN5
P3P40
VSS
XOUT
XIN
18 SQOUT P21
RESET
17 DFR P20
PU-IN P23
WRQ P22
1 2 3 4 5 6 7 8 9
E
XCOUT
VDD
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
R734
1K
P00
P01
P02
P10
POWER IN
SEG2
SEG1
SEG0
IC701
IX0105AW
SYSTEM
MICROCOMPUTER
VREF
AVSS
XCIN
D3 RES
D4 COCK
D5 COIN
D6 RWC
D7 SL+
D8 SL–
SEG7
SEG6
SEG5
SEG4
SEG3
32 P32
31 P31
30 P30
D1 MUTE
SEG10
SEG9
SEG8
SEG16
COM0
COM1
SEG12
SEG11
SCI
10 TH
TA
11
R811
3.3K
48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
9
C833
0.001
IC801
LA9241M
SERVO AMP.
C817
0.47/50
R830
1K
D
TESI
SPG
R711
2.7K
8
48 NC
C834
0.033
R820
10K
R710
10K
C809
0.047
R808
12K
TE
R871
4.7K
TBC 47
FSC 46
GND 45
SLI 44
R823
1.2K
R807
1K
R809
27K
R709
1K R712
1K
TE–
7
50 49
FIN2
FIN1
SP
1
6
1
2
C815
0.0047
2
E
F
TB
A GND
3
2
3
4
5
NC
4
56 55 54 53 52 51
FE–
5
C806
0.033
R806
100
57
R819
39K
6
C807
0.1/50 R805
6.8K
58
R814
10K
7
R708
1K
8
C701
0.022
C702
0.022
+B
C805
0.033
59
FE
LCD701
R802
100K
R804
2.2K
61 60
FA–
C804
0.001
62
FA
C
R803
15K
63
FD–
C803
0.1/50
64
LDS
1
LDD
2
1
VCC1
FW701
6
+B
F
E
B
A
K
C802
47/16
R801
1K
47
44
C868 R874
10/16 100
TEST3
LVDD 36
MUTEL 35
34
DOUT
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
TR–
TR+
FO+
FO–
GND
PD
TR+
FO+
FO–
TR+
FO+
VR
LD
FO–
TR–
TR–
PICKUP UNIT
C870
0.0022
R875 R876
10K 10K
C867
10/16
LVSS 38
LCHO 37
C2F
EMPH
CONT5
CONT4
CONT3
CONT2
CONT1
B
F
+B
+B
RVSS 39
R873
100
C869
0.0022
C890
100/10
33
R880
100
24 25 26 27 28 29 30 31 32
SL+
JP–
17 18 19 20 21 22 23
K
E
A
E
A
B
F
XL801
16.93MHz
XVSS 46
XIN 45
34 NC
33 TEST4
15 HFL
16 TES
BI801
TR+
TR–
FO–
FO+
PW
SFSY
FSX
SBCK
RWC
WRQ
COIN
SQOUT
RES
CQCK
16M
TST11
4.2M
CS
12 CLV+
13 CLV–
14 V/P–
15
16
C822
220P
TOFF 35
34
33
48 EFLG
47 SBSY
MON
K
48
43
IC802
42
41
LC78623D
SERVO/SIGNAL CONTROL RCHO 40
Vss
1
2
3
4
5
6
7
8
53 52 51 50 49
VVDD
FR
EMFO
10 EMFIN
11 TEST2
R834
1K
C831
0.0027
55 54
VDD
R835
470
CV+ 40
CV– 39
SLOF 38
HFL 37
TES 36
SL–
C832
27P
(CH)
57 56
XOUT
XVDD
MUTER
RVDD
FSEQ
R832
56K
R837
47K
DEFI
TAI
VVss
ISET
PCK
C830
2P
(CH)
R857 27K 6
7
R856 1.2K
8
9
1
2
PDO
JP–
RFSM 41
R833
5.6K
R836
47K
4
5
+B
+B
62 61 60 59 58
JP+
SLC 43
RFS– 42
C842
0.047
R838
33K
C834
0.033
C833
0.001
1
C841 2
0.047
3
TEST1
R858
680
TBC 47
FSC 46
GND 45
SLI 44
TGL
C845
4.7/50
64 63
TOFF
CLK
DEF
48 NC
C850
0.1
TEST5
+B
R871
4.7K
5
4
3
2
1
LD
1
VR
C
C801
0.01
R860
1K
C847
0.01
5
4
3
2
1
LD
PD
CNS801
+B
50 49
5
4
3
2
1
CNS802
BI802
QT-CD121
30 31 32
L801
0.82µH
+B
D802
1N4148
C843
100/10
C873
0.01
TR+
TR–
FO–
FO+
+B
R849
100K
R810
82K
R827
220K
R826 0.0033
220K
+B
C851
0.022
CNP803
1K
C821
1/50
NC
NC
MUTE
29
2.5V
2.5V
Q804
R877
220 7.4VS8050D4.8V
+B
R878
5.5V
100
+B
VOLTAGE
2V
0V
0.1V
2.2V
0V
2.5V
0V
2.5V
0V
0V
0V
4.1V
4.1V
5V
0V
2.7V
2.4V
0V
0V
0V
-3.2V
9
VIN2'
VIN2
10 VO2+
11
VO212 GND
0V 13
14 OP OUT
C889
10/16
SL–
PU-IN
VIN4' 24
2.5V
7.4V
BIAS IN 23
VCC 22
30
VCC 21
+B
6
6
6
5
5
5
4
4
4
3
3
3
2
2
2
1
1
1
M
M701
SPINDLE
MOTOR
M
M702
SLED
MOTOR
SW702
PICKUP IN
CD MOTOR PWB-B
+B
7.4V
VIN3' 20
19
VIN3
VO3+ 18
VO3– 17
2.7V
3.8V
3.2V
OP IN + 16
OP IN - 15
ZD801
MTZJ5.6B
C887
0.022
SL+
+B
L802
0.68µH
POWER GND
DIGITAL GND
DIGITAL +7.4V
L-CH
AUDIO GND
R-CH
GE PIN
NO.
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
+3.8V
0V 8
GND
SP–
3.5V
3.5V
2.5V
BI803
VIN1'
SP+
0V
CNS803
VO4– 27
VO4+ 26
VIN4 25
0V
C846
330/10
GND 28
VO1+
VIN1
C844
330/10
4
0V 5
0V 6
0V
7
VO1-
0V
3.5V
1
3.5V 2
2.5V 3
IC804
BA5914FP
FOCUS/TRACKING/SPIN/SLIDE DRIVER
+B
6 5 4 3 2 1
P12 1 - E
TO MAIN SECTION
• NOTES ON SCHEMATIC DIAGRAM can be found on page 16.
7
8
9
10
Figure 11 SCHEMATIC DIAGRAM (2/4)
– 11 –
11
12
QT-CD121
A
R5
330K
CF2
C28
0.0015
(Styrol)
VCO
AM/FM
12
C203
10/16
C35
1/50
C21
0.022
C33
1/50
C34
1/50
R13
3.9K
R14
3.9K
VC4
P11 7 - H
TO CD SERVO/
DISPLAY SECTION
C202
0.0056(ML)
SW201-B
CD
AUTO
FM
AM
TAPE
R16
2.2K
C36
0.022
C204
10/16
fH
fL
AM BAND
COVERAGE
R456
15K
1
2
3
4
5
6
R201
100K
R234
4.7K
R17
68
SW201-A
CD
AUTO
FM
AM
TAPE
R15
2.2K
L4
AM OSC.
R-CH
AUDIO GND
L-CH
CD +7.4V
DIGITAL GND
POWER GND
R203
10K
R202
100K
fH AM
fL TRACKING
TC4
R458 R457
1.2K 1.2K
R233
4.7K
CF1
TC3
D
C201
0.0056(ML)
11
R38
1.8K
C31
0.022
2
R-CH
MO/ST
3
C32
1
VCO
MPX VCO
CK 76kHz
13
10
9
8
0.022
+B
6 7
14
VC3
220P
C11
5
C26 4
22/16
AM IF
3
T3
2
L3
AM BAR ANT.
C17
0.022
GND
AM IN
2
AGC
C20
0.022
T1
C10 FM IF
0.022
R7
390
VR1
6.8K
(B)
R29
15K
C27
3.3/50
18 17 16 15
IC2
LA1805
FM/AF IF MPX.
1 3
R9
22K
C15
0.022
C23
0.01
R8
3.9K
1
19
AM
OUT
R25
120
20
FM
DET
C6
15P
(RH)
C25
3.3/50
T2
24 20 22 21
R3
47
C9
0.0047
C16
0.0047
C5
33P
(CH)
R27
33K
R11
1.2K
C24
470P
AM
IF
VC1
R1
10
C
4
AM RF
8
R2
33
C2
0.001
C4
22P
(CH) TC1
L1
FM ANT.
3 5 9 6
AM
MIX
PIN VOLTAGE
NO.
0.9V
1
1.6V
2
6.8V
3
0V
4
0V
5
6.8V
6
1.4V
7
6.2V
8
6.8V
9
FM DET
AM
FM
IF IN OSC
STB
2
FM
TRACKING
fL
fH
FM OSC.
L2
IC1
7
C38
C22 0.022
0.0039
C37
220/10
C39
0.022
FM BAND
COVERAGE
fH
fL
C29
10/16
D1
1N4148
C14
0.022
VC2
1
R6
820K
OSC
MIX
IC1
LA1186N
FM FRONT END
RF AMP.
1 2 3
B
C8
4P
(CH)
TC2
F1
B.P.F.
DET
OUT
MPX
IN
L-CH
ROD ANTENA
R455
15K
E
C105
0.0018
R103
12K
3
3
4
4
C107
820P
C111
330P
3
NF1
5 IN1
R
R
P
P
SW102-D
SW102-E
C106
0.0018
R
R110
120
R119
3.3K
OUT1 8
IC101
VCC
BA3311L FILTER
10
REC./P.B.
EQUALIZER AMP.
GND
6 7
C114
47/16
R108
1K
1
PRE AMP
9 IN2
NF2
4
C110 11
270P
C112
330P
C108
820P
ERASE HEAD
G
C109
270P
C116
0.018
(ML)
ALC T 2
OUT2
12
C118
10/16
R116
3.9K
R125
680K
R118 R120
3.9K 3.3K
R114
8.2K
P
SW102-H
D103
1N4148
C123
100/10
SW102-G
P
R
SW102-F
P
R
R122
1.5K
R106
15K
R124
3.3K
C351
0.0022
(ML)
R351
330
L301
47K
150
R352 R35
C352
220/10
H
• NOTES ON SCHEMATIC DIAGRAM can be found on page 16.
1
2
3
4
Figure 12 SCHEMATIC DIAGRAM (3/4)
– 12 –
5
6
C353
0.022
(ML)
C354
0 0056
2
R107
1K
D101
1N4148
1
2
SW102-B
P
R123
3.3K
P
C121
0.01
D102
1N4148
R-CH
1
R
P
R
C119
2.2/50
L-CH
R
SW102-A
R117
3.9K
R115
3.9K
C113
47/16
NC
CNS101
F
SW102-C
CNP101
TAPE
RECORD/PLAYBACK
HEAD
R109
120
330
R101
C120
47/16
330
R102
R121
1.5K
C115
R113
0.018(ML) 8.2K
C122
0.01
R105
15K
C117
10/16
R104
12K
QT-CD121
6
R208 12K C210
4.7/50
5
R234
4.7K
C212
100/10
7
R218
22K
R216
2.2K
4
IC201-2
KIA4558S
SURROUND
AMP.
C214
0.039
(ML)
4
C224
100/10
VOLUME
7
C225
220/25
3
R222
1K
C222
0.0015
11
C232
0.1
(ML)
9
–
+
10
6
C220
0.047
(ML)
5
J201
HEADPHONES
1
2
2
3
3
SP502
IC202
PIN VOLTAGE
NO.
0.1V
1
0V
2
11.2V
3
0V
4
11.3V
5
0V
6
0.1V
7
12V
8
10.4V
9
10 5.8V
11 0V
12 5.8V
13 10.4V
C234
1000/10
8
D201
1N4148
1
SPEAKERS
SP501
L-CH
C231
0.1
(ML)
13
R-CH
C223
100/10
CNS201
C233
1000/10
CNP201
+
–
C229
100/10
C217
0.0027
SW202-B
R220
3.3K
12
1
VR201-A
20K (B)
C215
0.039
SW202-A (ML)
R219
3.3K
5
1
2
C221
0.0015
C230
100/10
C204
10/16
R210
22K
R206
4.7K
C219
0.047
(ML)
IC202
LA4597
POWER AMP.
C202
0.0056(ML)
R204
10K
C208
4.7/50
5
1
C226
0.022
C206
0.0018
R202
100K
C207
4.7/50
R217
22K
C216
0.039(ML)
C205
0.0018
R228 120
AM SIGNAL
FM SIGNAL
CD SIGNAL
PLAYBACK SIGNAL
RECORD SIGNAL
R221
1K
C218
0.0027
R209
22K
R213 22K
R201
100K
R214 22K
R205
4.7K
R227 120
1.2V (0V)
1.9V (1.6V)
1V (1.3V)
1.7V
1.5V (1.7V)
1.5V (1.5V)
0.4V (0.4V)
6.1V (6.4V)
6.1V (6.4V)
1.6V
1.6V
1.6V
( ): AM
FW202
R207 12K
R211 C211
10K 47/16
R233
4.7K
2
R203
10K
HEADPHONES PWB-A4
MAIN PWB-A1(1/2)
VOLTAGE
X-BASS
C213
0.039
R215
(ML)
2.2K
1
R212
10K
C201
0.0056(ML)
C203
10/16
IC2
PIN
NO.
1.6V
13
1.6V
14
6V (6.3V)
15
0.2V (0.7V) 16
1.6V
17
0V
18
0V
19
0V
20
2.5V
21
2.5V
22
5.1V (6.6V) 23
0.8V (1V)
24
VOLTAGE
VR201-B
20K(B)
SW202
SURROUND
IC201-1
KIA4558S
SURROUND
AMP.
R231
330
C209
8
4.7/50
3
VCO
kHz
PIN
NO.
1
2
3
4
5
6
7
8
9
10
11
12
C227
3300/25
+B
+B
1N4148
1N4148
TERMINAL PWB-A3
R351
330
C352
220/10
C353
0.022
(ML)
C354
0.0056
(ML)
Q351
<3V> S8050D
47K
150
R352 R353 <0.7V>
7
<0.1V>
R354
10
C651
0.022
D652
1N4004
C652
0.022
CNS602
D651
1N4004
C654
0.022
D653
1N4004
AC INPUT
+B
BATTERYS
DC12V["D"size(UM/SUM-1,
R20 or HP2)battery x 8]
PIN
VOLTAGE
NO.
1 <0V> [3.23V]
2 <0V> [0V]
3 <0.6V> [0.6V]
4 <0V> [0V]
5 <0V> [0V]
6 <0V> [0V]
7 <0V> [0V]
8 <7.43V> [7.43V]
9 <0V> [0V]
10 <7.37V> [7.37V]
11 <0.6V> [0.6V]
12 <3.3V> [3.3V]
< >: Recording
[
]: Play
SW601
(241-7)
MAIN
R230
2.7
+B
+
+B
–
8
SO651
+B
IC101
SW102-G
P
R
1
2
D654
1N4004
1
2
C653
0.022
CD
FM AUTO
AM
TAPE
IC203
KIA7808P
SW201-C VOLTAGE REGULATOR
11.83V
3 OUT
IN 1
8V
C302
C301
2 0V
0.022
0.022
SW201-D
+B
CD
FM AUTO
AM
TAPE
CNP602
D309
D308
T601
POWER TRANSFOMER
9
10
Figure 13 SCHEMATIC DIAGRAM (4/4)
– 13 –
M
11
M601
(241-6)
TAPE
MOTOR
12
QT-CD121
HEADPHONES PWB-A4
R352
R106
R102
C106
R116
R114
R122
CNP602
R124
C844
C889
ZD801
R810
C849
R820
C815
R819
C811
C812
R816
C814
R815
R814
R828
R817
C848
E
C
B
12
10
1
8
C807
C809
R812
R806
C808
R807
R811
R809
R808
C810
5
1
CNS802
BK
WH
WH
WH
WH
5
BI802
R805
C806
C804
R803
R802
R804
C805
1
C801
C802
16
10
C839
BR
BK 1
BK 2
3
BK
4
BK
5
BK
6
BK
7
BK
8
Q805
17
C803
C850
C813
20
15
IC801
55
C840
R842
R830
R840
C816
R839
R821
C822
25
64
CNS801
8
BI801
35 30
45
50
60
C838
IC804
C818
R822
R823
C817
1
R827
R826
C830
R834
R835
R837
C831
R871
R838
1
R813
40
48
7
28
R829
C846
C819
R831
R833
C832
R832
C841
C842
R857
R856
R858
22
7
8
29
33 32
49
R716
R825
R824
C843
C873
R878
R877
C867
L802
1
C845
R742
C741
5
C835
R740
D740
R741
30
C820
C837
R743
C833
R836
C834
E
C740
R849
Q740
C847
R725
R726
R728
R723
R729
R722
R731
R720
R732
R719
R733
R718
1
ECB
R745
R744
D741
64
R860
R734
5
64
60
R730
R721
16
10
60
17
16
10
17
20
15
IC701
55
20
15
IC802
55
C821
49
49
C851
45
50
45
50
R727
25
40
48
R873
C868
XL801
X701
Q804
25
40
48
B C E
14
21
L801
35 30
R715
R736
R724
35 30
33 32
D802
33 32
R880
C890
C704
R711
6
15
COR801
R712
R714
C705
C702
R874
C869
R709
R713
D
LCD701
R456
R875
C887
R455
C870
R876
C301
R457
R458
R230
IC203
C302
C701
C114
D103
R120
C122
C230
C225
D201
TAPE
OFF
POWER
1
2
3
B
R710
C116
R108
C108
C232
IC202
ON
AM
SW201
FUNCTION
FM AUTO
CD
SW202
SURROUND
A
R708
R110
C110
C112
C119
C226
SW203
X-BASS
B
8
7
6
5
4
3
2
1
1
2
C231
C222
C224
1 2 3 4 5 6 7 8 9 10 11 12 13
D
R118
C117
R231
C221
C223
C214
C213
C
Q351
C220
C212
C219
A
IC101
C118
R101
R107
C107
R109
C109
C113
C115
R121
C111
R104
R103
C234
B C E
C354
C229
R215
R216
B
C353
C233
C206 C208
C211
R218
R217
R234
R219
R233
R212
R204
R206
C123
REC
F
C227
R208
C210
C205
R210
D102
R211
C215
A
R209 C207
R205
R222
A
VR201
VOLUME
C217
1
C121
R125
C120
C209
C202
R202
R221
C218
1
2
3
4
5
6
7
8
R115
R113
C201
R201
B
R203
D
1 3 5 7 9 11
2 4 6 8 10 12
D101
C216
R220
B
IC201
R119
R123
C203
R207
R213
R214
C204
5
R117
C105
R105
FW202
B
L301
P.B
A
1
R351
SW102
C352
G
R228
R227
C
C351
H
R353
E
R801
A
1 2 3 4 CNP101
C
R354
1 2 3
CNP201
FW202
5
J201
HEADPHONES
9
D309
R17
D308
T1
C20
BK
TC3
C11
VC4
C38
R14
R38
R16
C28
C39
R29
C27
L4
C35
VC3
C36
VCO
R6
TC2
TC1
SW772
STOP
VR1
C16
R772
C25
R25
C14
L2
VC2
R11
VC1
1
C779
R771
G
4
TRACK UP/CUE
C6
T2
TRACK DOWN/
REVIEW
C5
C4
L1
FW701
R8
C8
C9
SW773
IC2
24 23 22 21 2019 18 17 16 15 14 13
C23
R27
R1
F1
SW774
CF1
R2
R5
C34
C32
C37
2 3 4 5 6 7 8 9
C2
1
C29
1
2
C33
C31
1 2 3 4 5 6 7 8 9 10 11 12
1 2 3
C15
SWITCH PWB-A2
R9
IC1
3
1
2
3
C24
C17
C26
C10
R3
R7
2
1
2
3
4
5
6
T3
6
BI803
3
R13
R15
1
BK
CF2
F
COR1
C21
FW701
C22
5 4
SW761
CD LID
OPEN/CLOSE
CNS803
BR
GY
GY
GY
GY
GY
1
4
11
1
2
3
4
5
TC4
R774
R773
R776
R779
SW771
PLAY
RX771
3
2
1
H
L3
AM BAR ANTENNA
D1
MAIN PWB-A1
• The numbers 1 to 12 are waveform numbers shown in page 17.
1
2
3
4
Figure 14 WIRING OF P.W.BOARD (1/2)
– 14 –
5
6
QT-CD121
SPEKERS
SP502
R-CH
SP501
L-CH
COLOR TABLE
BR
CNS201
SW601
TAPE MAIN
(241-7)
1 WH
2 BK
3 RD
M601
TAPE MOTOR
(241-6)
TAPE
ERASE HEAD
(241-5)
RED
OR
ORANGE
YL
YELLOW
GR
GREEN
BL
BLUE
VL
VIOLET
GY
GRAY
WH(W)
WHITE
BK
BLACK
PK
PINK
RD
BK
BR
WH
YL
RECORD/PLAYBACK
HEAD(241-4)
BROWN
RD(R)
BK
CNS101
4
3
2
1
BK
WH
RD
BK
BK
(211)
T601
POWER
TRANSFORMER
TERMINAL PWB-A3
+
BATTERYS
DC12V["D"SIZE(UM/SUM-1,
R20 or HP2)battery 8]
C653
(236)
RD
D653
D652
RD
C652
C654
2
1
D654
D651
SO651
AC SOCKET
AC 120V
60Hz
CNS602
C651
OR
OR
PICK UP UNIT
CD MOTOR PWB-B
-
5 4 3 2 1
+
8 7 6 5 4 3 2 1
SW702
SPENDLE MOTOR
M701
CNP803
PICKUP IN
F3895AF
SLED MOTOR
M702
6
5
4
3
2
1
-
+
FM ROD ANTENNA(213)
7
8
9
10
Figure 15 WIRING OF P.W.BOARD (2/2)
– 15 –
11
12
QT-CD121
NOTES ON SCHEMATIC DIAGRAM
• Resistor:
To differentiate the units of resistors, the 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 an
ohm resistor. The resistor designated "Fusible" is a fuse type
resistor
• Capacitor:
To indicate the unit of capacitor, a symbol P is used: this
symbol P 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.
(CH), (TH), (RH), (UJ): Temperature compensation
(ML): Mylar type
(P.P.): Polypropylene type
• The indicated voltage in each section is the one measured by
Digital Multimeter between such a section and the chassis
with no signal given.
REF. NO
DESCRIPTION
1. Tuner
( ): AM mode
Marking except for ( ): FM mode
2. CD
( ): Play mode
Marking except for ( ): Stop state
3. Deck section
( ): Record mode
Marking except for ( ): Playback mode
Display / Control section:
( ): Active state
Marking except for ( ): CD Function mode at stop state
• 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
maintaining the safety of the set. Be sure to replace these
parts with specified ones for maintaining the safety and
performance of the set.
POSITION
REF. NO
DESCRIPTION
POSITION
SW102
RECODE/PLAYBACK
OFF—ON
SW702
SW201
FUNCTION/POWER
TAPE—AM—
FM AUTO—CD/
OFF—ON
SW761
CD LID OPEN/CLOSE
OFF—ON
SW771
PLAY/REPEAT
OFF—ON
SW772
STOP
OFF—ON
SW773
TRACK UP/CUE
OFF—ON
SW774
TRACK DOWN/REVIEW
OFF—ON
SW202
SURROUND
OFF—ON
SW203
X-BASS
OFF—ON
SW601
TAPE MAIN
OFF—ON
PICKUP IN
OFF—ON
FRONT
VIEW
E C B
(S) (G) (D)
(1) (2) (3)
2SC1815 GR
Figure 16 TYPES OF TRANSISTOR
– 16 –
QT-CD121
WAVEFORMS OF CD CIRCUIT
1
2
5ms
0.50 V
IC801 20 F.E
5ms
5.0 V
IC801 54 DRF
STOP
FOCUS
PLAY
SERCH
50ms
10.0 V
JP+
7
50ms
10.0 V
JP-
8
50ms
0.50 V
JP
9
50ms
1.00 V
TE
6
0.5ms
10.0 V
JP+
7
0.5ms
10.0 V
JP-
8
0.5ms
0.50 V
JP
9
0.5ms
1.00 V
TE
10
20ms
1.00 V
SPO
11
20ms
2.00 V
CLV+
10
50ms
1.00 V
SPO
11
50ms
2.00 V
CLV+
3
1
3
6
CUE
0.5ms
1.00 V
HF
1
4
0.5ms
5.0 V
HFL
5
0.5ms
5.0 V
TES
3
0.5ms
1.00 V
H.F
4
0.5ms
5.0 V
HFL
5
0.5ms
5.0 V
TES
2
REVIEW
3
REVIEW
PLAY
NORMAL DISC
TN0=01
1
6
50ms
10.0 V
JP+
7
50ms
10.0 V
JP-
8
50ms
0.50 V
JP
9
50ms
1.00 V
TE
6
0.5ms
10.0 V
JP+
7
0.5ms
10.0 V
JP-
8
0.5ms
0.50 V
JP
9
0.5ms
1.00 V
TE
2
3
PLAY
TCD-712 (140mm)
TN0=01
CUE
PLAY
TCD-712
12
5s
100mV
SLD
1
12
0.5s
100mV
SLD
1
– 17 –
QT-CD121
TROUBLESHOOTING
When the CD does not function
When the CD section does not operate When the objective lens of the optical pickup is dirty,this section may not operate.Clean
the objective lens,and check the playback operation.When this section does not operate even after the above step is taken,check
the following items.
Remove the cabinet and follow the troubleshooting instructions.
"Track skipping and/or no TOC(Table Of Contents) may be caused by build up of dust other foreign matter on the laser pickup lens.
Before attempting any adjustment make certain that the lens is clean. If not, clean it as mentioned below."
Turn the power off.
Gently clean the lens with a lens cleaning tissue and a small amount of isopropyl alcohol.
Do not touch the lens with the bare hand.
• The CD function will not work.
The CD operating keys don't work.
Yes
Check the CD, DPS microcomputer (IC701), power supply, 4.19
MHz and 16.93 MHz clock, and reset terminal.
Yes
Check the waveform of SCK, SO (DATA) and SI (COMM).
Yes
See if the pick-up is in the pick-up in SW702 position.
Yes
If the items mentioned above are OK, check the main
microcomputer IC701.
• The CD operating keys work.
Check the Focus - HF system.
Playback can be performed without a disc.
Yes
Does the pick-up move up and down twice?
Focus search OK.
Yes
No
Does the output waveform of IC801(16)(FD) match that shown in
Fig. 18?
Check the area around IC804-BI801/CNS801.
Yes
No
Check the IC801(50)(CLK) line, 4MHz.
Check the microcomputer data on pins (51)(CL), (52)(DAT) and
(53)CE.
Focus search
is performed
two times
when play
operation is
done without
disc.
0.5s
0.50 V
IC801 16 FD
0.5s
0.50 V
IC801 15 TD
1
2
Figure 18
– 18 –
QT-CD121
• Playback can only be performed when a disc
is loaded.
No
Check the laser diode driver.
Check the area around IC801(16) - (21) (focus servo circuit).
No
If the disc is not turning, the DRF
should not change to "H".
Is the Focus servo active? (Can you hear it working?)
Yes
▼
Yes
Does the DRF signal change from "L" to "H"?
Check the spin
system.
Yes
Yes
No
Level is abnormal.
▼
Is HF waveform normal (see the Fig. 19-1, 2)?
Yes
Check the periphery
of IC801 pins 41 and
42.
Yes
Check the tracking system.
HF
0.1V/DIV
0.5µsec/DIV(DC)
(When playing
back the disc)
▼
Waveform is unstable.
Check the spin
system.
Waveform in case
of normal playback
0.5s
1.00 V
IC801 16 FD
0.5s
10.0 V
IC801 12 CLV+
2
1
3
0.5s
10.0 V
IC801 54 DRF
4
0.5s
2.00 V
IC801 7 TE
Figure 19-1
Figure 19-2
• Check the tracking system.
Check waveform of IC801 pin 7 (TE).
The waveform shown in Fig. 19-3
appears, and no-disc state appears
soon.
Play is possible in
TEST mode.
Yes
Tracking servo is inoperative.
Yes
Although IL is possible,
play is impossible.
Yes
Data cannot be read.
Yes
Yes
Normal jump is impeded, and the
program top cannot be reached.
Check the VCO-PLL system.
5ms
1.00 V
IC801 7 TE
4
5 ms
5.0 V
IC801 54 DRF
3
Figure 19-3
– 19 –
Check the periphery of IC801
pin 8 to pin 15, and IC804 to
BI801/CNS801.
Yes
Check the periphery of
IC801 pin 14.
QT-CD121
• Checking the spin system.
Play operation is performed without disc.
Yes
The spin driver circuit is normal.
The turntable rotates a little.
Yes
No
The turntable fails to rotate or rotates at high speed.
Yes
Check the periphery of IC801 pins 23 to 27, pin 39 and pin 40,
IC802 pin 12 and pin 13, IC804 to BI803/CNS803.
• Checking the VCO-PLL system
Play operation is performed when disc exits.
Yes
Although HF waveform is normal, TOC data cannot be read.
Yes
Check PDO waveform (Fig. 20).
Error
Check the IC801 pins 43 and 44, IC802 pins 3, 5, 7, 9 and 10.
0.5s
1.00 V
IC802 3 PDO
2
0.5s
1.00 V
IC801 16 FD
Stop --> Play
As VCO frequency is locked at
4.32 M Hz,
voltage of PDO
rises and stabilizes.
3
Figure 20
•
Although HF waveform is normal and the time
indication is normal, no sound is emitted.
Check IC802 pin 48 (EFLG).
No
Yes
Check IC802 pins 37and 40.
Abnomal
Check the periphery of IC803 (OPAMP).
– 20 –
Usually, the number of pulses of flawless disc is 100 pulses/sec
or less.
QT-CD121
FUNCTION TABLE OF IC
IC701 RH-iX0105AWZZ (IX0105AW): System Control Microcomputer
Pin No.
Terminal
Name
Port Name
Input/
Output
Function
1*
P03
MTCONT2
Input/Output Used to input or output 4 bits at a time. When the output latch is set to "1", the unit will be in the
input mode. The key-on wakeup function, which can be switched on or off by the software, and a
pull-up transistor, which can be turned on or off by the software, are built in.
2*-5*
P10-P13
POWER-IN,
DATA (VOL),
STB (VOL)
Input/Output Used to input or output 4 bits at a time. When the output latch is set to "1", the unit will be in the
input CK (VOL), mode.The key-on wakeup function, which can be switched on or off by the software,
and a pull-up transistor,which can be turned on or off by the software, are built in.
6*
D0
POWER-ON
Input/Output Each terminal can be used to input or output 1 bit at a time. The output section has a latch which
holds 1 bit. One of the D ports is assigned by register Y as a data point, to execute input or output.
To use the port for input, set the output latch for that bit to "1". All of the output latches on port D can
be set to "1" using the CLD command.
7
D1
MUTE
Input/Output Each terminal can be used to input or output 1 bit at a time. The output section has a latch which
holds 1 bit. One of the D ports is assigned by register Y as a data point, to execute input or output.
To use the port for input, set the output latch for that bit to "1". All of the output latches on port D can
be set to "1" using the CLD command.
8*-12
D2-D6
SYNC-OUT,
RES,CQCK,
COIN,REC
Input/Output Each terminal can be used to input or output 1 bit at a time. The output section has a latch which
holds 1 bit. One of the D ports is assigned by register Y as a data point, to execute input or output.
To use the port for input, set the output latch for that bit to "1". All of the output latches on port D can
be set to "1" using the CLD command.
13,14
D7,D8
SL+,SL-
Input/Output Each terminal can be used to input or output 1 bit at a time. The output section has a latch which
holds 1 bit. One of the D ports is assigned by register Y as a data point, to execute input or output.
To use the port for input, set the output latch for that bit to "1". All of the output latches on port D can
be set to "1" using the CLD command.
15*,16*
D9,D10
SRS2,SRS1
Input/Output Each terminal can be used to input or output 1 bit at a time. The output section has a latch which
holds 1 bit. One of the D ports is assigned by register Y as a data point, to execute input or output.
To use the port for input, set the output latch for that bit to "1". All of the output latches on port D can
be set to "1" using the CLD command.
17
P20
DRF
Input/Output Used to receive 4 bits at a time.
18
P21
SQOUT
Input/Output Used to receive 4 bits at a time.
19
P22
WRQ
Input/Output Used to receive 4 bits at a time.
20
P23
PU-IN
Input/Output Used to receive 4 bits at a time.
21
RESET
22
XIN
23
XOUT
24
VSS
—
25
VDD
—
26*
XCOUT
27
XCIN
28
AVSS
Input
GND input terminal for the A-D converter.
29
VREF
Input
Reference voltage input terminal for the A-D converter.
30
P30
REMOCONINT2
Input
Used to receive 4 bits at a time.
31
P31
TORAY1
Input
Used to receive 4 bits at a time.
32
P32
TORAY2
Input
Used to receive 4 bits at a time.
33
P33
Input
Used to receive 4 bits at a time.
34
P40
Input
Used to receive 4 bits at a time.
35-37
AIN5-AIN7
Input
Used to receive 4 bits at a time.
38-40
VLC3-VLC1
Input
LCD power input terminals. To use the internal resistor, connect VLC3 to VDD (if a brightness
control is needed, connect VLC3 to VDD through a resistor). When an external power supply is
used, applyvoltages as follows: 0<VLC1<VLC3<VLCD<VDD.
41-44
COM3-COM0
Output
LCD common output terminals.
45-61*
SEG16-SEG0
(45*-56*)
Output
LCD segment output terminals.
62*-64*
P00-P02
Input/Output Reset pulse input/output terminal. When a reset is caused by the watch dog timer, an "L" level will
be output. The output is an N channel open drain.
Input
Input/output terminals for the main clock generation circuit. Used by connecting a ceramic resonator
between the XIN and XOUT terminals. There is a built-in feedback resistor between the XIN and
XOUT terminals.
Output
Input/output terminals for the main clock generation circuit. Used by connecting a ceramic resonator
between the XIN and XOUT terminals. There is a built-in feedback resistor between the XIN and
XOUT terminals.
GND input terminal.
Positive power supply terminal.
Output
Input/output terminals for the sub clock generation circuit. Used by connecting a crystal oscillator
between the XCIN and XCOUT terminals. There is a built-in feedback resistor between the XCIN
and XCOUT terminals.
Input
Input/output terminals for the sub clock generation circuit. Used by connecting a crystal oscillator
between the XCIN and XCOUT terminals. There is a built-in feedback resistor between the XCIN
and XCOUT terminals.
Input/Output Used to input or output 4 bits at a time. When the output latch is set to "1", the unit will be in the
input mode. The key-on wakeup function, which can be switched on or off by the software, and a
pull-up transistor, which can be turned on or off by the software, are built in.
In this unit, the terminal with asterisk mark (*) is (open) terminal which is not connected to the outside.
– 21 –
QT-CD121
—MEMO—
– 22 –
QT-CD121
PARTS GUIDE
MODEL
QT-CD121
“HOW TO ORDER REPLACEMENT PARTS”
To have your order filled promptly and correctly, please furnish the
following information.
1. MODEL NUMBER
2. REF. No.
3. PART NO.
4. DESCRIPTION
For U.S.A. only
Contact your nearest SHARP Parts Distributor to order.
For location of SHARP Parts Distributor,
Please call Toll-Free;
1-800-BE-SHARP
MARK: SPARE PARTS-DELIVERY SECTION
Explanation of capacitors/resistors parts codes
Capacitors
Resistors
VCC ....................... Ceramic type
VCK ........................ Ceramic type
VCT ........................ Semiconductor type
VC • • MF ............... Cylindrical type (without lead wire)
VC • • MN ............... Cylindrical type (without lead wire)
VC • • TV ................ Square type (without lead wire)
VC • • TQ ............... Square type (without lead wire)
VC • • CY ............... Square type (without lead wire)
VC • • CZ ............... Square type (without lead wire)
VC • • • • • • • • • J .. The 13th character represents capacity difference.
("J" ±5%, "K" ±10%, "M" ±20%, "N" ±30%,
"C" ±0.25 pF, "D" ±0.5 pF, "Z" +80-20%.)
VRD ....................... Carbon-film type
VRS ........................ Carbon-film type
VRN ....................... Metal-film type
VR • • MF ............... Cylindrical type (without lead wire)
VR • • MN ............... Cylindrical type (without lead wire)
VR • • TV ................ Square type (without lead wire)
VR • • TQ ............... Square type (without lead wire)
VR • • CY ............... Square type (without lead wire)
VR • • CZ ............... Square type (without lead wire)
VR • • • • • • • • • J .. The 13th character represents error.
("J" ±5%, "F" ±1%, "D" ±0.5%.)
If there are no indications for the electrolytic capacitors, error is ±20%.
If there are no indications for other parts, the resistors are ±5%
carbon-film type.
NOTE:
Parts marked with “
” are important for maintaining the safety of the set.
Be sure to replace parts with specified ones for maintaining the safety and performance of the set.
– 23 –
QT-CD121
NO.
PRICE
RANK
PART CODE
DESCRIPTION
INTEGRATED CIRCUITS
IC1
IC2
IC101
VHILA1186N/-1
VHILA1805//-1
VHIBA3311L/-1
J
J
J
IC201
IC202
IC203
IC701
VHIKIA4558S-1
VHILA4597//-1
VHIKIA7808P-1
RH-IX0105AWZZ
J
J
J
J
IC801
IC802
IC804
VHILA9241M/-1
VHILC78623D-1
VHIBA5914FP-1
J
J
J
AE FM Front End,LA1186N
AM FM/AF IF MPX.,LA1805
AK REC./P.B.Equalizer Amp.,
BA3311L
AK Surround Amp.,KIA4558S
AH Power Amp.,LA4597
AH Voltage Regulator,KIA7808P
BA System Microcomputer,
IX0105AW
AS Servo Amp.,LA9241M
AY Servo/Signal Control,LC78623D
AN Focus/Tracking/Spin/Slide
Driver,BA5914FP
TRANSISTORS
Q351
Q740
Q804
Q805
VSS8050D///-1
VS2SC1815GR-1
VSS8050D///-1
VSS9012H///-1
J
J
J
J
AC
AB
AC
AC
Silicon,NPN,S8050 D
Silicon,NPN,2SC1815 GR
Silicon,NPN,S8050 D
Silicon,PNP,S9012 H
VHD1N4148//-1
VHD1N4148//-1
VHD1N4148//-1
VHD1N4148//-1
VHD1N4004//-1
VHD1N4148//-1
VHD1N4148//-1
VHEMTZJ5R6B-1
J
J
J
J
J
J
J
J
AA
AA
AA
AA
AB
AA
AA
AD
Silicon,1N4148
Silicon,1N4148
Silicon,1N4148
Silicon,1N4148
Silicon,1N4004
Silicon,1N4148
Silicon,1N4148
Zener,5.6V,MTZJ5.6B
RFILF0001SJZZ
RFILA0001SJZZ
RFILR0001SJZZ
J
J
J
AD FM IF
AD AM IF
AD FM Band Pass Filter
RCILI0001SJZZ
RCILI0002SJZZ
RCILI0003SJZZ
RTRNP0001SJZZ
J
J
J
J
AD
AD
AD
AP
FM IF
FM Detection
AM IF
Power
RCILR0001SJZZ
RCILB0001SJZZ
RCILA0001SJZZ
RCILB0002SJZZ
RCILB0003SJZZ
VP-DHR82K0000
VP-DHR68K0000
J
J
J
J
J
J
J
AB
AE
AD
AC
AD
AE
AC
FM RF
OSC,FM
AM Bar Antenna
OSC,AM
OSC,Bias
0.82 µH,Choke
0.68 µH
J
J
AC 6.8 kohms (B),Semi-VR [VCO]
AE 20 kohms (B),Semi-VR [Volume]
DIODES
!
D1
D101~103
D201
D308,309
D651~654
D740,741
D802
ZD801
FILTERS
CF1
CF2
F1
TRANSFORMERS
!
T1
T2
T3
T601
COILS
L1
L2
L3
L4
L301
L801
L802
VARIABLE RESISTORS
VR1
VR201
RVR-M0001SJZZ
RVR-B0001SJZZ
VARIABLE CAPACITORS
VC1~4
RVC-R0001SJZZ
J
AK Variable Capacitor with Trimmer
(TC1~4)
J
J
AD Ceramic,4 MHz
AE Ceramic,16.93 MHz
J
J
J
J
J
J
J
J
AA
AA
AA
AA
AA
AB
AB
AA
VIBRATORS
X701
XL801
RCRM-0001SJZZ
RCRM-0002SJZZ
CAPACITORS
C2
C4
C5
C6
C8
C9
C10
C11
VCKYPA1HB102K
VCCCPA1HH220J
VCCCPA1HH330J
VCCRPA1HH150J
VCCCPA1HH4R0C
VCKYPA1HB472K
VCKYPA1HF223Z
VCKYPA1HB221K
0.001 µF,50V
22 pF (CH),50V
33 pF (CH),50V
15 pF (RH),50V
4 pF (CH),50V
0.0047 µF,50V
0.022 µF,50V
220 pF,50V
NO.
C14,15
C16
C17
C20,21
C22
C23
C24
C25
C26
C27
C28
C29
C31,32
C33~35
C36
C37
C38,39
C105,106
C107,108
C109,110
C111,112
C113,114
C115,116
C117,118
C119
C120
C121,122
C123
C201,202
C203,204
C205,206
C207~210
C211
C212
C213~216
C217,218
C219,220
C221,222
C223,224
C225
C226
C227
C229,230
C231,232
C233,234
C301,302
C351
C352
C353
C354
C651~654
C701,702
C704
C705
C740
C741
C779
C801
C802
C803
C804
C805,806
C807
C808
C809
C810
C811
C812
C813
C814
C815
C816
C817
C818
C819
C820
C821
C822
C830
C831
C832
C833
–1–
PRICE
RANK
PARTS CODE
VCKYPA1HF223Z
VCKYPA1HB472K
VCKYPA1HF223Z
VCKYPA1HF223Z
VCKYPA1HB392K
VCKYPA1HF103Z
VCKYPA1HB471K
RC-GZA335AF1H
RC-GZA226AF1C
RC-GZA335AF1H
VCQSMV1HS152J
RC-GZA106AF1C
VCTYPA1CU223M
RC-GZA105AF1H
VCKYPA1HF223Z
RC-GZA227AF1A
VCKYPA1HF223Z
VCKYPA1HB182K
VCKYPA1HB821K
VCKYPA1HB271K
VCKYPA1HB331K
RC-GZA476AF1C
VCQYKA1HM183K
RC-GZA106AF1C
RC-GZA225AF1H
RC-GZA476AF1C
VCKYPA1HF103Z
RC-GZA107AF1A
VCQYKA1HM562K
RC-GZA106AF1C
VCKYPA1HB182K
RC-GZA475AF1H
RC-GZA476AF1C
RC-GZA106AF1C
VCQYKA1HM393K
VCKYPA1HB272K
VCQYKA1HM473K
VCKYPA1HB152K
RC-GZA107AF1A
RC-GZA227AF1E
VCKYPA1HF223Z
RC-GZW338AF1E
RC-GZA107AF1A
VCQYKA1HM104K
RC-GZV108AF1A
VCKYPA1HF223Z
VCQYKA1HM222K
RC-GZA227AF1A
VCQYKA1HM223K
VCQYKA1HM562K
VCKYPA1HF223Z
VCKYPA1HF223Z
RC-GZA107AF1A
VCKYPA1HF223Z
VCKYPA1HF103Z
RC-GZA335AF1H
RC-GZA106AF1C
VCKYPA1HF103Z
RC-GZA476AF1C
RC-GZA104AF1H
VCKYPA1HB102K
VCTYPA1CU333M
RC-GZA104AF1H
VCTYPA1CU683M
VCTYPA1CU473M
VCKYPA1HB181K
VCTYPA1CU104M
VCKYPA1HB331K
VCTYPA1CU104M
VCTYPA1CU103M
VCKYPA1HB472K
VCKYPA1HB102K
RC-GZA474AF1H
RC-GZA105AF1H
RC-GZA476AF1C
VCKYPA1HB332K
RC-GZA105AF1H
VCKYPA1HB221K
VCCCPA1HH2R0C
VCKYPA1HB272K
VCCCPA1HH270J
VCKYPA1HB102K
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
AB
AB
AB
AB
AA
AB
AA
AB
AB
AB
AB
AB
AB
AB
AB
AB
AB
AB
AA
AA
AA
AB
AB
AB
AB
AB
AB
AB
AA
AB
AB
AB
AB
AB
AB
AA
AB
AA
AB
AB
AB
AG
AB
AB
AD
AB
AA
AB
AB
AA
AB
AB
AB
AB
AB
AB
AB
AB
AB
AB
AA
AB
AB
AB
AB
AA
AB
AA
AB
AE
AB
AA
AA
AB
AB
AA
AB
AA
AA
AA
AA
AA
DESCRIPTION
0.022 µF,50V
0.0047 µF,50V
0.022 µF,50V
0.022 µF,50V
0.0039 µF,50V
0.01 µF,16V
470 pF,50V
3.3 µF,50V,Electrolytic
22 µF,16V,Electrolytic
3.3 µF,50V,Electrolytic
0.0015 µF,50V,Styrol
10 µF,16V,Electrolytic
0.022 µF,16V
1 µF,50V,Electrolytic
0.022 µF,50V
220 µF,10V,Electrolytic
0.022 µF,50V
0.0018µF,50V
820 pF,50V
270 pF,50V
330 pF,50V
47 µF,16V,Electrolytic
0.018 µF,50V,Mylar
10 µF,16V,Electrolytic
2.2 µF,50V,Electrolytic
47 µF,16V,Electrolytic
0.01 µF,16V
100 µF,10V,Electrolytic
0.0056 µF,50V,Mylar
10 µF,16V,Electrolytic
0.0018 µF,50V
4.7 µF,50V,Electrolytic
47 µF,16V,Electrolytic
10 µF,16V,Electrolytic
0.039 µF,50V,Mylar
0.0027 µF,50V
0.047 µF,50V,Mylar
0.0015 µF,50V
100 µF,10V,Electrolytic
220 µF,25V,Electrolytic
0.022 µF,50V
3300 µF,25V,Electrolytic
100 µF,10V,Electrolytic
0.1 µF,50V,Mylar
1000 µF,10V,Electrolytic
0.022 µF,50V
0.0022 µF,50V,Mylar
220 µF,10V,Electrolytic
0.022 µF,50V,Mylar
0.0056 µF,50V,Mylar
0.022 µF,50V
0.022 µF,50V
100 µF,10V,Electrolytic
0.022 µF,50V
0.01 µF,16V
3.3 µF,50V,Electrolytic
10 µF,16V,Electrolytic
0.01 µF,16V
47 µF,16V,Electrolytic
0.1 µF,50V,Electrolytic
0.001 µF,50V
0.033 µF,16V
0.1 µF,50V,Electrolytic
0.068 µF,16V
0.047 µF,16V
180 pF,50V
0.1 µF,16V
330 pF,50V
0.1 µF,16V
0.01 µF,16V
0.0047 µF,50V
0.001 µF,50V
0.47 µF,50V,Electrolytic
1 µF,50V,Electrolytic
47 µF,16V,Electrolytic
0.0033 µF,50V
1 µF,50V,Electrolytic
220 pF,50V
2 pF (CH),50V
0.0027 µF,50V
27 pF (CH),50V
0.001 µF,50V
QT-CD121
NO.
C834
C835
C837
C838
C839
C840
C841,842
C843
C844
C845
C846
C847
C848
C849
C850
C851
C867,868
C869,870
C873
C887
C889
C890
PRICE
RANK
PART CODE
VCTYPA1CU333M
RC-GZA104AF1H
RC-GZA106AF1C
VCTYPA1CU103M
RC-GZA105AF1H
RC-GZA334AF1H
VCTYPA1CU473M
RC-GZA107AF1A
RC-GZA337AF1A
RC-GZA475AF1H
RC-GZA337AF1A
VCTYPA1CU103M
RC-GZA105AF1H
VCKYPA1HF223Z
VCTYPA1CU104M
VCKYPA1HF223Z
RC-GZA106AF1C
VCKYPA1HB222K
VCKYPA1HF103Z
VCKYPA1HF223Z
RC-GZA106AF1C
RC-GZA107AF1A
DESCRIPTION
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
AB
AB
AB
AE
AB
AA
AB
AB
AB
AB
AB
AE
AB
AB
AB
AB
AB
AA
AB
AB
AB
AB
0.033 µF,16V
0.1 µF,50V,Electrolytic
10 µF,16V,Electrolytic
0.01 µF,16V
1 µF,50V,Electrolytic
0.33 µF,50V,Electrolytic
0.047 µF,16V
100 µF,10V,Electrolytic
330 µF,10V,Electrolytic
4.7 µF,50V,Electrolytic
330 µF,10V,Electrolytic
0.01 µF,16V
1 µF,50V,Electrolytic
0.022 µF,50V
0.1 µF,16V
0.022 µF,50V
10 µF,16V,Electrolytic
0.0022 µF,50V
0.01 µF,16V
0.022 µF,50V
10 µF,16V,Electrolytic
100 µF,10V,Electrolytic
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
10 ohm,1/4W
33 ohms,1/6W
47 ohms,1/4W
330 kohms,1/6W
820 kohms,1/6W
390 ohms,1/4W
3.9 kohms,1/6W
22 kohms,1/6W
1.2 kohms,1/6W
3.9 kohms,1/6W
2.2 kohms,1/6W
68 ohms,1/4W
120 ohms,1/6W
33 kohms,1/6W
15 kohms,1/6W
1.8 kohms,1/4W
330 ohms,1/6W
12 kohms,1/6W
15 kohms,1/6W
1 kohm,1/6W
120 ohms,1/6W
8.2 kohms,1/6W
3.9 kohms,1/6W
3.3 kohms,1/6W
1.5 kohms,1/6W
3.3 kohms,1/6W
680 kohms,1/6W
100 kohm,1/6W
10 kohm,1/6W
4.7 kohms,1/6W
12 kohms,1/6W
22 kohms,1/6W
10 kohm,1/6W
22 kohms,1/6W
2.2 kohms,1/6W
22 kohms,1/6W
3.3 kohms,1/6W
1 kohm,1/6W
120 ohms,1/4W
2.7 ohms,1/4W
330 ohms,1/4W
4.7 kohms,1/6W
330 ohms,1/4W
150 ohms,1/4W
47 kohms,1/4W
10 ohm,1/4W
15 kohms,1/6W
1.2 kohms,1/6W
1 kohm,1/6W
10 kohm,1/6W
2.7 kohms,1/6W
1 kohm,1/6W
1 kohm,1/6W
10 kohm,1/6W
15 kohms,1/6W
10 kohm,1/6W
15 kohms,1/6W
NO.
R724
R725
R726
R727
R728,729
R730
R731~734
R736
R740
R741
R742
R743
R744,745
R771
R772
R773
R774
R776
R779
R801
R802
R803
R804
R805
R806
R807
R808
R809
R810
R811
R812
R813
R814
R815
R816
R817
R819
R820
R821
R822
R823
R824
R825
R826,827
R828,829
R830,831
R832
R833
R834
R835
R836,837
R838
R839,840
R842
R849
R856
R857
R858
R860
R871
R873,874
R875,876
R877
R878
R880
RESISTORS
R1
R2
R3
R5
R6
R7
R8
R9
R11
R13,14
R15,16
R17
R25
R27
R29
R38
R101,102
R103,104
R105,106
R107,108
R109,110
R113,114
R115~118
R119,120
R121,122
R123,124
R125
R201,202
R203,204
R205,206
R207,208
R209,210
R211,212
R213,214
R215,216
R217,218
R219,220
R221,222
R227,228
R230
R231
R233,234
R351
R352
R353
R354
R455,456
R457,458
R708,709
R710
R711
R712
R713
R714
R715
R716
R718~723
VRD-ST2EE100J
VRD-ST2CD330J
VRD-ST2EE470J
VRD-ST2CD334J
VRD-ST2CD824J
VRD-ST2EE391J
VRD-ST2CD392J
VRD-ST2CD223J
VRD-ST2CD122J
VRD-ST2CD392J
VRD-ST2CD222J
VRD-ST2EE680J
VRD-ST2CD121J
VRD-ST2CD333J
VRD-ST2CD153J
VRD-ST2EE182J
VRD-ST2CD331J
VRD-ST2CD123J
VRD-ST2CD153J
VRD-ST2CD102J
VRD-ST2CD121J
VRD-ST2CD822J
VRD-ST2CD392J
VRD-ST2CD332J
VRD-ST2CD152J
VRD-ST2CD332J
VRD-ST2CD684J
VRD-ST2CD104J
VRD-ST2CD103J
VRD-ST2CD472J
VRD-ST2CD123J
VRD-ST2CD223J
VRD-ST2CD103J
VRD-ST2CD223J
VRD-ST2CD222J
VRD-ST2CD223J
VRD-ST2CD332J
VRD-ST2CD102J
VRD-ST2EE121J
VRD-ST2EE2R7J
VRD-ST2EE331J
VRD-ST2CD472J
VRD-ST2EE331J
VRD-ST2EE151J
VRD-ST2EE473J
VRD-ST2EE100J
VRD-ST2CD153J
VRD-ST2CD122J
VRD-ST2CD102J
VRD-ST2CD103J
VRD-ST2CD272J
VRD-ST2CD102J
VRD-ST2CD102J
VRD-ST2CD103J
VRD-ST2CD153J
VRD-ST2CD103J
VRD-ST2CD153J
PRICE
RANK
PARTS CODE
VRD-ST2EE153J
VRD-ST2CD153J
VRD-ST2CD102J
VRD-ST2EE102J
VRD-ST2CD102J
VRD-ST2EE102J
VRD-ST2CD102J
VRD-ST2CD102J
VRD-ST2CD472J
VRD-ST2CD332J
VRD-ST2CD102J
VRD-ST2CD104J
VRD-ST2CD103J
VRD-ST2EE392J
VRD-ST2EE272J
VRD-ST2EE182J
VRD-ST2EE152J
VRD-ST2EE103J
VRD-ST2EE470J
VRD-ST2CD102J
VRD-ST2CD104J
VRD-ST2CD153J
VRD-ST2CD222J
VRD-ST2CD682J
VRD-ST2CD101J
VRD-ST2CD102J
VRD-ST2CD123J
VRD-ST2CD273J
VRD-ST2CD823J
VRD-ST2CD332J
VRD-ST2CD153J
VRD-ST2CD333J
VRD-ST2CD103J
VRD-ST2CD473J
VRD-ST2CD152J
VRD-ST2CD823J
VRD-ST2CD393J
VRD-ST2CD103J
VRD-ST2CD563J
VRD-ST2CD682J
VRD-ST2CD122J
VRD-ST2CD103J
VRD-ST2CD122J
VRD-ST2CD224J
VRD-ST2EE102J
VRD-ST2CD102J
VRD-ST2CD563J
VRD-ST2CD562J
VRD-ST2CD102J
VRD-ST2CD471J
VRD-ST2CD473J
VRD-ST2CD333J
VRD-ST2CD223J
VRD-ST2EE220J
VRD-ST2CD104J
VRD-ST2CD122J
VRD-ST2CD273J
VRD-ST2CD681J
VRD-ST2CD102J
VRD-ST2CD472J
VRD-ST2CD101J
VRD-ST2CD103J
VRD-ST2EE221J
VRD-ST2CD101J
VRD-ST2CD101J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
DESCRIPTION
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
AA
15 kohms,1/4W
15 kohms,1/6W
1 kohm,1/6W
1 kohm,1/4W
1 kohm,1/6W
1 kohm,1/4W
1 kohm,1/6W
1 kohm,1/6W
4.7 kohms,1/6W
3.3 kohms,1/6W
1 kohm,1/6W
100 kohm,1/6W
10 kohm,1/6W
3.9 kohms,1/4W
2.7 kohms,1/4W
1.8 kohms,1/4W
1.5 kohms,1/4W
10 kohm,1/4W
47 ohms,1/4W
1 kohm,1/6W
100 kohm,1/6W
15 kohms,1/6W
2.2 kohms,1/6W
6.8 kohms,1/6W
100 ohm,1/6W
1 kohm,1/6W
12 kohms,1/6W
27 kohms,1/6W
82 kohms,1/6W
3.3 kohms,1/6W
15 kohms,1/6W
33 kohms,1/6W
10 kohm,1/6W
47 kohms,1/6W
1.5 kohms,1/6W
82 kohms,1/6W
39 kohms,1/6W
10 kohm,1/6W
56 kohms,1/6W
6.8 kohms,1/6W
1.2 kohms,1/6W
10 kohm,1/6W
1.2 kohms,1/6W
220 kohms,1/6W
1 kohm,1/4W
1 kohm,1/6W
56 kohms,1/6W
5.6 kohms,1/6W
1 kohm,1/6W
470 ohms,1/6W
47 kohms,1/6W
33 kohms,1/6W
22 kohms,1/6W
22 ohms,1/4W
100 kohm,1/6W
1.2 kohms,1/6W
27 kohms,1/6W
680 ohms,1/6W
1 kohm,1/6W
4.7 kohms,1/6W
100 ohm,1/6W
10 kohm,1/6W
220 ohms,1/4W
100 ohm,1/6W
100 ohm,1/6W
AF
AD
AE
AC
AC
AC
AC
Connector Ass’y,8/8Pin
Connector Ass’y,5/5Pin
Connector Ass’y,6/6Pin
Socket,4Pin
Socket,3Pin
Socket,2Pin
Plug,6Pin
Connector Ass’y,4Pin
Connector Ass’y,3Pin
Connector Ass’y,2Pin
Core
Core
Flat Wire,5Pin
Flat Wire,4Pin
OTHER CIRCUITRY PARTS
BI801/CNS801
BI802/CNS802
BI803/CNS803
CNP101
CNP201
CNP602
CNP803
CNS101
CNS201
CNS602
COR1
COR801
FW202
FW701
–2–
QCNWN0003SJZZ
QCNWN0004SJZZ
QCNWN0005SJZZ
QCNCW001DSJZZ
QCNCW001CSJZZ
QCNCW002BSJZZ
QCNCM932FAFZZ
QCNWN0010SJZZ
QCNWN0001SJZZ
QCNWN0007SJZZ
RCORF0001SJZZ
RCORF0001SJZZ
QCNWN0012SJZZ
QCNWN0011SJZZ
J
J
J
J
J
J
J
J
J
J
J
J
J
J
AD
AC
AC
AC
AF
AE
QT-CD121
NO.
!
PRICE
RANK
PART CODE
J201
LCD701
M601
M701
M702
RX771
SO651
SP501,502
SP503,504
SW102
QJAKM0007AWZZ
RV-LX0001SJZZ
9GD192112343W
RMOTV0408AFM3
RMOTV0409AFM1
VHLSPS4461/-1
QSOCA0001SJZZ
VSP0010PBT98S
RALMB0001SJZZ
QSW-S0001SJZZ
J
J
J
J
J
J
J
J
J
J
AF
AH
AX
AN
AN
AQ
AE
AL
AH
AD
SW201
QSW-S0002SJZZ
J
AD
SW202
SW203
SW601
SW702
SW761
QSW-P0001SJZZ
QSW-P0001SJZZ
9GD6401011499
QSW-F9001AWZZ
QSW-F0001SJZZ
J
J
J
J
J
AD
AD
AE
AE
AD
SW771
SW772
SW773
SW774
QSW-K0001SJZZ
QSW-K0001SJZZ
QSW-K0001SJZZ
QSW-K0001SJZZ
J
J
J
J
AC
AC
AC
AC
DESCRIPTION
Jack,Headphones
LCD
Motor with Pulley [Tape]
Motor with Chassis [Spindle]
Motor with Gear [Sled]
Remote Sensor,SPS4461
AC Socket
Speaker,Woofer
Tweeter
Switch,Slide Type
[Record/Playback]
Switch,Slide Type
[Function/Power]
Switch,Push Type [SURROUND]
Switch,Push Type [X-BASS]
Switch,Leaf Type [Tape Main]
Switch,Push Type [Pickup In]
Switch,Leaf/Skeleton Type
[CD Lid Open/Close]
Switch,Key Type [Play]
Switch,Key Type [Stop]
Switch,Key Type [Track Up/Cue]
Switch,Key Type
[Track Down/Review]
!
NGERH0586AFZZ
NGERH0587AFZZ
MLEVP1054AFZZ
NSFTM0291AFFW
PCUSG0613AFZZ
RCTRH8179AFZZ
XBSSD26P06000
XHBSD20P05000
XBBSD20P03000
LX-WZ1070AFZZ
RMOTV0408AFM3
RMOTV0409AFM1
QSW-F9001AWZZ
237
238
239
241
241- 1
241- 2
241- 3
241- 4
241- 5
241- 6(M601)
241- 7(SW601)
242
243
601
602
603
604
605
606
607
608
J
J
J
J
J
J
J
J
J
J
J
J
J
AC
AC
AC
AD
AC
BG
AA
AA
AA
AA
AN
AN
AE
Gear,Middle
Gear,Drive
Rail,Guide
Shaft,Guide
Cushion
Pickup Unit Ass’y
Screw,ø2.6×6mm
Screw,ø2×5mm
Screw,ø2×3mm
Washer,ø4.5×ø1.5×0.25mm
Motor with Chassis [Spindle]
Motor with Gear [Sled]
Switch,Push Type [Pickup In]
Front Cabinet Ass’y
Top Cabinet
Rear Cabinet
Gear,Damper
Bracket,Dial
Panel,Control
Panel,Dial
Cover,Volume
Knob,Volume
Nylon Band
Spring,Battery,+/Handle
Rod Antenna
Spring,Rod Antenna
Battery Compartment Lid
Knob,Tuning
Knob,X-BASS
Knob,CD
Knob,Function
Spring,CD Lid
Cassette Lid
Spring,Cassette Lid
Button,Pause
Button,Stop
Button,FF
Button,REW
Button,Play
Button,Rec
Bracket,Button
Leg,Cushion
CD Lid
Stabilizer Ass’y
Stabilizer
(Not Replacement Item)
Magnet
Lever,Record
Drum
Holder,LCD
Spring,Battery,-
GCABA1002SJM1
GCABC1001SJSA
GCABB1002SJSA
CGERH0001SJ01
LHLDZ1001SJZZ
HPNLC1002SJSA
HPNLD1001SJSA
HDECQ0001SJSA
JKNBK0007SJSA
LHLDW1001SJZZ
MSPRC0002SJFD
JHNDP1001SJSA
QANTR0001SJZZ
MSPRZ0001SJFD
GFTAB1001SJSA
JKNBZ0002SJSA
JKNBK0005SJSA
JKNBZ0004SJSA
JKNBK0003SJSA
MSPRD0002SJFD
GFTAC1001SJSA
MSPRD0001SJFD
JBTN-0001SJSA
JBTN-0002SJSA
JBTN-0003SJSA
JBTN-0004SJSA
JBTN-0005SJSA
JBTN-0006SJSA
LANGK0001SJFW
PGUMS0001SJZZ
GFTAT1001SJSA
CHLDM1001SJ01
————
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
BC
AL
AU
AF
AD
AF
AD
AD
AF
AD
AC
AE
AG
AC
AD
AD
AF
AF
AC
AC
AE
AC
AC
AC
AC
AC
AC
AC
AC
AB
AE
AG
—
232- 2
233
234
235
236
PMAGF0002AWZZ
MSPRP0001SJFW
NDRM-0001SJZZ
LHLDZ1002SJZZ
MSPRC0001SJFN
J
J
J
J
J
AE
AC
AD
AC
AC
PCUSS0001SJZZ
PRDAR0001SJZZ
LHLDA1001SJZZ
CMECB0001SJ01
9GD192104309
9GD192107039
9GD192109389
9GD62070114
9GD62091010
9GD192112343W
9GD6401011499
TSPC-0001SJZZ
JKNBK0006SJSA
XUBSD30P12000
XUBSD30P20000
XUBSD30P10000
XUBSD25P10000
XWHSD28-08120
XUPSD25P08000
XUBSD30P08000
XBBSD25P06000
QACCD0006AW00
RRMCG0052AWSA
TINSE0003SJZZ
TLABR0965SJZZ
TLABZ0003SJZZ
DESCRIPTION
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
J
AB
AD
AC
AY
AR
AE
AE
AL
AM
AX
AE
AL
AE
AA
AA
AA
AB
AB
AB
AA
AB
Cushion
Heat Sink
Holder
Tape Mechanism Ass’y
Pinch Roller Arm Ass’y
Belt,RF
Belt,Main
Head,Playback/Record
Head,Erase
Motor with Pulley [Tape]
Switch,Leaf Type [Tape Main]
Specification Label
Knob,Surround
Screw,ø3×12mm
Screw,ø3×20mm
Screw,ø3×10mm
Screw,ø2.5×10mm
Screw,ø2.8×ø12×0.8mm
Screw,ø2.5×8mm
Screw,ø3×8mm
Screw,ø2.5×6mm
J
J
J
J
J
AP
BB
AE
AD
AE
AC Power Supply Cord
Remote Control
Operation Manual
Label,Bar Code
Feature Label
P.W.B. ASSEMBLY (Not Replacement Item)
PWB-A1~5
DCEK-0001SJ03
J
PWB-B
QPWBF3895AFZZ
J
CABINET PARTS
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
232- 1
PRICE
RANK
PARTS CODE
ACCESSORIES
!
CD MECHANISM PARTS
301
302
303
304
305
306
701
702
703
704
M701
M702
SW702
NO.
–3–
—
Main/Switch/Terminal/Headphones/Spacer
(Combined Ass’y)
AC CD Motor (PWB Only)
QT-CD121
306
701
A
704
304
701
B
302
702
C
301
303
D
703x2
E
M701
F
305
M702
305x2
G
SW702
H
PWB-B
1
2
3
4
Figure 4 CD MECHANISM EXPLODED VIEW
––27
4 ––
5
6
QT-CD121
203
213
601x3
A
215
212
242
PWB-A3
B
211
236
602x6
214
601x2
221
PWB-A5
231
601
603
603
603x2
C
230x2
603
202
PWB-A4
603
601x2
TAPE
MECHANISM
241 (241-1, 241-2
241-3, 241-4, 241-5,
241-6, 241-7)
D
232-2
222
228
227
226
225
229
220
204
CD
MECHANISM
602
606
223
216
SW761
224
603x4
608
607x2
603
603
234
E
205
Silicon
Grease
605x3
603x4
607
604x3
SP503 SP501
201
F
232-1
232
607
PWB-A1
218
238
219 243
603x2
603
217
235
G
PWB-A2
207
603x5
LCD701
603x4
SP502
208
210
209
SP504
206
H
NOTE: The parts of cassette mechanism which are supplied are only the unit and consumable parts.
1
2
3
4
Figure 5 CABINET EXPLODED VIEW
––28
5 ––
5
6
QT-CD121
PACKING OF THE SET
• Setting position of switches and knobs
Tape Mechanism Control
STOP STATE
TUNING
LOW
POWER/FUNCTION
OFF/TAPE
X-BASS
OFF
SURROUND
OFF
VOLUME
LOW
Remote
Control
AC Power
Supply Cord
Polyethylene Bag, Unit
SSAKH0001SJZZ
Packing Case
SPAKC0003SJZZ
Feature Label
FR
ON
T
Operation Manual
FR
ON
T
Packing Add., Left/Right
SPAKA0001SJZZ
Bar Code Label
: Not Replacement Item
––29
6 ––
QT-CD121
—MEMO—
––30
7 ––
QT-CD121
—MEMO—
––31
8 ––
QT-CD121
COPYRIGHT
©
1998 BY SHARP COPORATION
ALL RIGHTS RESERVED.
No part of this publication may be reproduced,
stored in a retrieval system, or transmitted in
any from or by any means, electronic, mechanical,
photocopying, recording, or otherwise, without
prior written permission of the publisher.
SHARP CORPORATION
Communication Systems Group
Quality & Reliability Control Center
Higashihiroshima, Hiroshima 739-0192, Japan
Printed in Japan
A9805-2002NS•HA•M
SC • LAG
– 32 –