DOWNLOAD Sharp QT-CD250 (serv.man6) Service Manual ↓ Size: 1.92 MB | Pages: 40 in PDF or view online for FREE

Model
QT-CD250 (serv.man6)
Pages
40
Size
1.92 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio / Portable / Including circuit diagrams
File
qt-cd250-sm6.pdf
Date
PREV: Sharp QT-CD250 (serv.man5) Service Manual / Parts Guide

Sharp QT-CD250 (serv.man6) Service Manual ▷ View online

QT-CD250H/W
– 13 –
D. VOLUME TEST MODE
Set the function switch to "POWER ON (TAPE PLAY, TUNER or CD)"  when pressing the "REVIEW(PRESET DOWN )" button
together with "PLAY/PAUSE (TUNING UP)" button.
The LCD display do not indicate the VOLUME level at this time.
But, the VOLUME level is "12" which is defaults level.
The VOLUME LEVEL can be change when press the "VOLUME UP" button either press the "VOLUME DOWN" button.
"VOLUME UP" button is pressed : (12 VoL) -> 30 VoL -> 30 VoL (30 is flashing)
"VOLUME DOWN" button is pressed : (12 VoL) ->  1 VoL->  0 VoL  ->  0 VoL (0 is flashing)
E. TUNER FM/AM INTERVAL (SPAN) SELECTION (for QT-CD250W Only)
To change the tuning span: (default: AM 9 kHz/FM 50 kHz SPAN)
1. Set the function switch to TUNER.
2. Hold down the "MEMORY" button and the "PRESET DOWN button for at least 3-seconds.
    Release the button when "AM SP 9 kHz" and "FM SP 50 kHz" are displayed alternately.
3. Press the "BAND" button to select the "AM SP 10 kHz" and "FM SP 100 kHz" are displayed alternately.
4. Press the "MEMORY" button to set it when desired INTERVAL (SPAN) frequency displayed.
    The unit will return back to the normal frequency displayed.
1 sec
Displayed alternately
When press the "BAND" button
1 sec
QT-CD250H/W
– 14 –
A
B
C
D
E
F
G
H
1
2
3
4
5
6
• The numbers   
1 
 to 
 17 
 are waveform numbers shown in page 19.
Figure 14 SCHEMATIC DIAGRAM (1/2)
COR1
C856
100P
C29 
100P
R865
47K
D804
1N4148
C75
100P 
C34
220P
C33
220P
C5
0.1
COR801
BI801
BI802
C805
0.022
C806
330/10
R853
2.2K
R852
2.2K
C807
0.047
IC803
LA6541D
30 29 28 27 26 25 24  23 22 21 20
19 18 17 16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
R851
2.2K
R76
820 
L51
100
µ
H
C54
0.022 
R13
10K 
R18
100 
C68
220P 
R77
3.3K
R17
47K
R14
2.2K
C58 100P
C57 100P
C18 0.001
R20
470
R879
4.7K
D806
1N4148
R862
47K
1
R861
10K
CF4
R854
100
C12
1/50
R8
1K
R58
1K
R15
39K
R71
4.7K
R74
3.3K
R73
3.3K
C26
0.1
C23
10/16
C7
0.001
R4
10
L2
R845
22K
R866
3.3K
D802
1N4148
C245
1/50
C243
330P
C244
330P
R242
10K
R241
10K
C242
1/50
C241
1/50
R240
2.2K
R239
2.2K
R238
2.7K
C224
0.1/50
C223
0.1/50
R237
2.7K
R236
47K
R235
47K
R233
2.2K
R234
2.2K
SW201-C
SW201-B
C9
0.022
C10
8P
L803
220
µ
H
R850
1.5K
1
R249
220
C74
1/50
R72
4.7K
C825
47/16
C247
220/10
R247
560
R248
560
R246
5.6K
R244
560K
R243
560K
R245
5.6K
R51
150
C61
100/10
C73
1/50
R54
10K
R354
4.7
R353
33K
C353
0.0056
(ML)
R352
150
C354
0.022(ML)
C352
100/10
R351
100
R126
100
L301
C351
0.0022(ML)
R124
3.3K
R123
3.3K
R121
2.7K
R122
2.7K
X51
4.5MHz
R456
15K
R458
1K
R457
1K
R455
15K
R62
1K
R61
1K
R60
1K
R59
1K
C60
0.0022
C59
0.01
C55
2.2/50
R53
4.7K
R52
2.2K
C53
100/10
TC1
R8
220K
C11
360P
VD3
KV1520NT
C25
0.047
F1
C27
0.001
C8
0.001
R6
15K
R2
3.3K
C24
0.1
C19
2.2/50
R12
10
R7
10K
VD2
KV1370NT
R5
22K
C6
22P(CH)
C32
0.1
R1
100K
C3
0.01
L1
C2
0.001
VD1
KV1370NT
R3
100K
C1
15P(CH)
C830
0.01(ML)
C828
0.0027
C829
0.0047
R832
3.3K
C827
0.015(M
R827
15K
C835
470P
R831
3.3K
R830
10K
R829
3.3K
R812
1K
R834
3.3K
C833
0.033(ML)
R833
3.3K
C854
0.0068
IC801
TA2109F
24 
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9 
8 
7 
6 
5 
4 
3 
2 
1 
C819
0.1(ML)
R802
2.2K
C818
56P
C822
0.047
C863
47/16
C841
0.047 
C842
0.047
C843
47/16 
C826
47P
R826
220K
D1
1N4148
R16
3.3K 
C22
1/50 
C14 
0.047 
C71
0.018(ML) 
C72 
0.018
(ML) 
C16
4.7/50 
CF1 
CF3 
T3
C15
220/10 
R10
330 
C13
0.47/50 
IC1 
24
23 22 21
20
19 18 17 16
15
14
13
12
11
10
9
8
7
6 
5
4
3
2
1
C21
10/16 
C20
330P
C51
15P
(CH)
C52
12P
(CH)
IC51 LC72121
22
21
20
19
18
17
16
15
14
13
12
11 10 9 8
7 6 5 4 3 2 1
R55
56K
C56
0.022
C821
100/10
R806
2.7K
R807
1K
C801
0.01
R805
39K
C820
0.1(ML)
R811
22K
C804
2P(CH)
R803
82K
C813
47/16
C814
0.047
R804
68K
D101
1N4148
R110
120
R115
3.9K
C118
10/16
R125
680K
R104
12K
R103
12K
C121
0.01
C113
47/16
C110
270P
R114
8.2K
R113
8.2K
C119
2.2/50
C105
0.0018
R101
330
R120
3.3K
R105
15K
C112
330P
R116
3.9K
C116
0.018
(ML)
R106
15K
C106
0.0018
C122
0.01
R119
3.3K
R118
3.9K
CNP101
R102
330
C117
10/16
D102
1N4148
C115
0.018(ML)
C111
330P
C108
820P
R117
3.9K
C120
47/16
C123
220/10
C114
47/16
C109
270P
C107
820P
R109
120
IC101
BA3311L
12
11
10
9
8
7
6
5
4
3
2
1
C817
100/10
C816
0.022
C815
47/16
BI803
C802
0.022
R820
47K
X801
16.93MHz
C838
0.047(ML)
C839
0.047(ML)
C834
470P
C836
0.047(ML)
C845
0.047
C837
0.047(ML)
R828
10K
R801
22
C832
47/16
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
Speaker  Case
MONO/
ST 
FM/AM 
BO1
PD
VSSD
BO4
BO3
BO2
DO
CL
VSSA
VCO
FM/AM
IND
ST
OUT
AM  IF 
IF
MIX 
FM RF 
R-CH
L-CH
FM  DET
AM  IF 
FM OSC
FM RF 
MPX
IN
DET
OSC 
OUT 
IN
AM
OSC 
FM
AM RF 
OSC 
IN
GND 
AM LOW
CUT 
OUT 
VCC 
IN
FM  IF 
AGC 
GND 
LPF2
LPF1
REQ 
RF
OUT 
VCC 
FM RF 
FM RF 
IN
QUAD
TU
CD
AOUT
IO2 
IFIN
AMIN
FMIN
AIN 
VDD 
IO1 
DI
CE
XIN 
XOUT
CD
R-CH
L-CH
TRO 
FOO 
DMO 
FMO 
VCC 
VREF
CD
RES 
REG IN
REG OUT 
VIN4
VIN3
VIN2
GND 
GND 
7.5V 
GND 
GND 
GND 
VG4 
VG3 
VG2 
VO4-
VO4+
VO3-
VO3+
VO2+
VO2-
VO1-
VO1+
VG1 
VIN1
MT
VCC 
SW810 
OPEN/CLOSE
CD  LID
CNS802
CNS801
CNS803
R-CH(CD)
L-CH(CD)
GND(AUDIO)
+7.5V(CD) 
CNP803
FM
ROD 
ANTENNA 
- 
+ 
SW601
TAPE
MAIN 
M601
TAPE
MOTOR 
ALC T 
FILTER
VCC 
GND 
NF1 
NF2 
IN2 
IN1 
OUT2
OUT1
R 
P 
R 
P
P
R
P
P
P
R 
R
R
R
PRE AMP 
TA
TU
TA
P 
M702
SPINDLE
MOTOR
M701
SLED
MOTOR 
SW702
PICKUP IN 
+ 
+ 
- 
- 
SP+ 
SP- 
SL+ 
SL- 
PU-IN 
LD
K
E
E 
K 
LD
VR
PD
G 
B
B 
A
F 
F 
C 
TR+ 
TR- 
FO+ 
FO- 
R-
R+
2200P
2200P
CD  MOTOR  PWB-B
FC- 
FC+ 
TR- 
TR+ 
GND 
GND 
K
F 
B 
E 
A 
VCC 
FNI 
FPI 
TPI 
TNI 
MDI 
LDO 
SEL 
TEB 
2VRO
TEN 
TEO 
RFN 
GND 
RFO 
AGCI
RFGC
RFGO
RFIS
RFRP
VRO 
FEN 
FEO 
SBAD
MON 
1M
1M
LTOH30P1
SLT-
SLT+
FM- 
FM+ 
DM- 
DM+ 
8 
7 
6 
5 
4 
6 
7 
8 
3 
2 
1 
4 
3 
2 
1 
5 
4 
3 
2 
1 
8 
7 
6 
5 
2 
4 
3 
2 
1 
5 
1 
3 
2 
3 
4 
5 
1 
5 
4 
11
14
13
12
10
7
8
9
M
12
2
1
3
2
1
3
TA2104BN
4
3
1
2
9
13
22
M
M
1
2
3
4
5
6
SW102-D
SW102-H
SW102-E
SW102-A
SW102-F
SW102-G
SW102-B
SW102
RECORD/
PLAYBACK
A
PICK-UP  UNIT
LD
VR
PD
F+
F-
1
2
3
4
5
6
1
2
3
4
5
6
SW102-C
8 7
P 
6 5 4
16 17 18
3 2 1
Q801
KTA1266 GR
L3
AM BAR ANTENNA
FM BAND
PASS
FILTER 
2 3
1
SW102
RECORD/
PLAYBACK
19 20 21
14 15
23 24
Q1
KTC3199 GR
R
Q351
KTC3199 GR
11 10
Q210
KTC3199 GR
Q209
KTC3199 GR
VSSX
1
2
3
Q803
KRC107 M
2
3
Q802
KTA1273 Y
Q806
KTA1273 Y
Q805
KRC107 M
2
3
Q804
KTA12
SWITC
Q2
KRA102 M
TUNER
SWITHCING
Q211
KTC3199 GR
Q212
KTC3199 GR
4.4V 
1.9V 
1.9V 
0.5V 
0.5V 
0V 
3.8V 
0V 
0V 
3.7V 
1.9V 
1.9V 
0.8V 
1.9V 
1.9V 
1.9V 
0.9V 
1.9V 
1.9V 
0.5V 
1.9V 
0.1V 
GND 
1.9V 
VCC 
1.9V 
1.9V 
3.4V 
3.4V 
GND 
GND 
GND 
3.4V 
3.4V 
1.9V 
1.9V 
1.9V 
1.9V 
3.4V 
3.4V 
3.4V 
3.4V 
1.9V 
1.9V 
7.5V 
LASER DRIVER
4.4V(ON:2.8V)
1.4V(ON:1.9V)
3.7V(ON:2.1V)
SWITCHING
7.5V
7.5V(TUN:0V)
6.9V
(TUN:7.5V)
GND
SWITCHING
0V
(TUN:7.5V)
4.5V
(TUN:
0.5V)
50
V
4.4V
GND
0V
(TUN:7.5V)
4.4V
SWITCHING
5.0V
5.0V
(TUN:0V)
4.3V
(TUN:5.0V)
SWITCHING
IC801
SERVO PRE AMP.
TA2109F
8
9
10
IC803
FOCUS/
TRACKING/
SPIN/
SLED DRIVER
LA6541D
2
3
AM BAND
COVERAGE fL
FM BAND
COVERAGE fL L2
9
8
7
6
5
4
3
2
1
12
11
10
PIN
NO.
VOLTAGE
IC1
GND
0.8V(0V)
0.V
3.5V(4.1V)
3.7V(4.1V)
3.2V(4.1V)
3.7V(4.1V)
GND
0.4V(0.1V)
3.0V(3.6V)
1.2V
1.2V
21
20
19
18
17
16
15
14
13
24
23
22
PIN
NO.
VOLTAGE
2.9V(0V)
3.1V
0.7V
1.0V
0.9V
5.0V
3.6V(4.0V)
3.7V(4.1V)
3.7V(4.1V)
3.7V(4.1V)
3.7V(4.1V)
3.7V(4.1V)
(    ): AM
CNS101
L-CH
R-CH
ERASE  HEAD
4
3
2
1
RECORD/
PLAYBACK HEAD 
TAPE
IC51
LC72121
ELECTRONIC
TUNING
IC1
FM/AM IF MPX.,
TA2104BN
IC101
REC./P.B.EQUALIZER AMP.
BA3311L
L4
AM OSC.
AM TRACKING fL
AM TRACKING fH
AM  IF
FM  IF
0.6V 
0V 
0V 
0.6V 
3.2V 
3.1V 
7.3V 
7.3V 
0V 
VOLTAGE:
PLAY and REC. 
SW102
RECORD/
PLAYBACK
SW102
RECORD/
PLAYBACK
SW102
RECORD/
PLAYBACK
SW201
FUNCTION
SELECTOR
BIAS OSC.
SW102
RECORD/
PLAYBACK
+B
+B
+B
+B
+B
+B
+B
+B
+B
+B
+B
+B
+B
+B
+B
9
8
7
6
5
4
3
2
1
12
11
10
PIN
NO.
IC51
1.6V
GND
0.V
0V
0V
4.9V
-
3.1V
2.9V
0V
5.0V
0V
0.9V
GND
0V
1.5V
3.2V
0.9V
0.9V
1.7V
GND
1.6V
21
20
19
18
17
16
15
14
13
22
VOLTAGE
FM ST
FM MONO AM
1.6V
GND
0.V
0V
0V
4.9V
-
0V
2.9V
0V
5.0V
0V
0.9V
GND
0V
1.5V
3.2V
0.9V
0.9V
1.7V
GND
1.6V
2V
GND
0.V
0V
0V
4.9V
-
0.7V
0V
0V
5.0V
0V
0.9V
GND
2.0V
0V
4.2V
0.9V
0.9V
1.0V
GND
2.0V
0V
GND
0V
5.0V
5.0V
(CD: 0.4V)
GND
(CD: OPEN)
TUNER
MUTE
0V
0V
(REC: 4.0V)
0V
(REC: 0.4V)
BIAS OSC.
0V
GND
0V(OFF:0.6V)
0V(OFF:0.6V)
0V
GND
0.2V
0.2V
2.0V
2.0V
0.8V
0.8V
Q209,Q210 
X-BASS ON/OFF
Q211,Q212 
LINE AMP
L107
CHOKE
COIL
L108
CHOKE
COIL
D807
1N4148
L807
0.82
µ
H
CF2  2
1
3
FM  IF
QT-CD250H/W
– 15 –
Figure 15 SCHEMATIC DIAGRAM (2/2)
7
8
9
10
11
12
• NOTES ON SCHEMATIC DIAGRAM can be found on page 18.
+B
C302
0.022
C872
0.0047 
C249
100P C204
0.022
D202
1N4148
C870
100P
R871
4.7K
R253
3.9K
R856
15K
FW801
FW802
R214
1K
R215
1K
R216
1K
R210
1K
R209
1K
R218
8.2K
R217
8.2K
D806
1N4148
R862
47K
1
C201
100/16
C230
1/50
R222
4.7K
C214
0.1/50
R221
4.7K
C213
0.1/50
R870
4.7K
R869
4.7K
LCD801
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
CNP602
CNS602
SW809
X-BASS
R857
47K
R854
100
C226
0.022
CNS801
CNP801
D803
1N4148
R855
18K
R841
5.6K
R848
10K
R849
18K
R847
5.6K
R843
4.7K
R846
4.7K
R821
1K
R876
10K
C862
0.1
X802
4.19MHz
C846
1/50
D805
1N4148
C211
0.047
C212
0.047
R202
10K
R205
4.7K
C203
0.01
C202
47/16
R201
1.2K
R203
270
ZD201
DZ5.1BSB
D203
1N4148
R901
47K
R900
47K
R899
47K
R898
47K
R897
47K
R896
47K
R895
47K
R894
47K
R893
47K
R892
47K
R891
47K
R890
47K
R889
47K
R888
47K
R887
47K
R886
47K
R885
47K
R884
47K
R883
47K
R882
47K
C865
100/10
C864
0.1
R873
4.7K
R878
10K
R877
10K
R875
10K
R868
4.7K
C231
1/50
R251
22K
R252
22K
C229
1/50
D801
1N4148
C245
1/50
C243
330P
C244
330P
R242
10K
R241
10K
C242
1/50
C241
1/50
R240
2.2K
R239
2.2K
R238
2.7K
R237
2.7K
C232
1/50
R872
4.7K
R867
4.7K
R825
10K
R839
47K
R860
4.7K
R863
1.8K
C847
22/16
C848
22/16
C853
0.022
C844
100/10
R836
270
R835
270
C220
0.1/50
C219
0.1/50
C210
0.022
D204
1N4148
D205
1N4148
R206
560
R204
2.2K
C206
47/16
C209
0.01
ZD202
DZ7.5BSB
R213
100
R212
47K
R211
47K
R225
100K
C653
0.022
D653
1N4004
D652
1N4004
C652
0.022
D654
1N4004
D651
1N4004
C654
0.022
C651
0.022
R249
220
R224
4.7K
C246
10/16
R223
4.7K
C825
47/16
D201
1N4148
R864
1M
L801
220
µ
H
R250
470K
C247
220/10
R247
560
R248
560
R246
5.6K
R244
560K
R243
560K
R245
5.6K
SW201-D
SW201-A
R354
4.7
51
5MHz
R456
15K
R458
1K
R457
1K
R455
15K
ZD203
ZD2.4BSB 
C810
10/16
R808
100
C830
0.01(ML)
C828
0.0027
C829
0.0047
R832
3.3K
C827
0.015(ML)
R827
15K
R831
3.3K
R830
10K
R829
3.3K
R812
1K
R834
3.3K
C833
0.033(ML)
R833
3.3K
C823
0.022
C840
0.1
C854
0.0068
IC802
SERVO/
SIGNAL
CONTROL
TC9457F2
100
99
98
97
96
95
94
93
92
91
90
89
88
87
86
85
84
83
82
81
80
79
78
77
76
75
74
73
72
71
70
69
68
67
66
65
64
63
62
61
60
59
58
57
56
55
54
53
52
51
50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7 
6
5
4
3
2
1
C852
3.3/50
C851
3.3/50
C849
0.0022 
C850
0.0022
R844
22K
C826
47P
R824
10K 
R826
220K
R842
22K
R838
10K
R837
10K 
R207
560
C207
470/10
C208
0.022
C205
47/16 
C218
0.0039(ML)
C217
0.0039(ML)
R220
220K
IC202 
16
15
14
13
12
11
10
9
8 7 6 5
4
3 2 1
C216
0.039(ML)
R219
220K
C215
0.039(ML)
C236
100/10
R232
120
C221
0.001
C222
0.001
C235
100/10
R231
120
C225
100/10
14
13
12
2
3
9
5
6
7
8
4
10
11
1
C239
0.1(ML)
C238
100/10
C237
100/10
C234
1000/10
C233
1000/10
CNP201
R228
120
R227
120
HPJ201
HEADPHONES
R820
47K
X801
16.93MHz
ML)
C824
47/16
ML)
C845
0.047
ML)
R828
10K
R840
10
C227
4700/16
NC
NC
NC
NC
NC
X-BASS
SWITCH PWB-A4
P_MUTE
STB_(VOL) 
CE_(PLL)
CD
POWER
HOLD
7.5V
5V
X-BASS
TUNER-
FUNC
SEG17 
CL
DI
DO
CD-FUNC 
KEY2
KEY1
ADIN3 
SEG16 
SEG15 
VSS
STB
DATA
CK
CS
+5V(u  COM)
+4.5V(BACK  UP)
DC 9V ["D" size (UM/SUM-1,R20 or
HP-2) battery x 6]
TAPE
TUN 
TUN 
ST
MEMORY
KHz 
MHz 
CNS201
BATTERY
NC
NC
NC
NC
SP202 
SP201 
POWER PWB-A3
R-CH(CD)
L-CH(CD)
GND(AUDIO)
GND(POWER)
GND(CD) 
SPEAKERS
L-CH
R-CH
4  OHM 
4  OHM 
+5V(CD) 
SELECTOR
- 
+ 
SW601
TAPE
MAIN 
M601
TAPE
MOTOR 
TAPE
CD
CD
AC/DC 
AC  INPUT
- 
- 
+ 
+ 
IC201
TA8227P
POWER  AMP. 
MVSS1 
MVDD1 
SEG1
COM1
MVDD
MVSS
MXI 
MXO 
REMO-IN 
RESET 
DVSL
LO
DVRL
DVDD
DVRR
RO
DVSR
TEST0 
DOUT
SBSY
SBOK
VDD1
VSS1
P2VREF
PDO 
TMAX
LPFN
LPFO
PVREF 
VCOF
AVSS
SLCO
RFI 
AVDD
RFCT
RFZI
RFRP
FEI 
SBAD
TEI 
TEZI
FOO 
TRO 
VREF
RFGC
TEBC
FMO 
DMO 
2VREF 
SEL 
VDD2
VSS2
XI
XO
XVDD
SEG2
SEG3
SEG4
SEG5
SEG6
SEG7
SEG8
SEG9
SEG10 
SEG11 
SEG12 
SEG13 
SEG14 
DOOR IN 
PU  IN 
TEST1 
TEST2 
TEST3 
TEST4 
TEST5 
XVSS
COM2
COM3
COM4
NC
CD CONTROL PWB-A2
SO651
AC INPUT
SOCKET 
T651
POWER 
TRANSFORMER
12
12
1
2
3
2
4
1
3
2
4
1
3
Q204
KTA1273Y
16
17
18
19
1 
4
3
2
M
1
2
3
1
2
3
199 GR
Q210
KTC3199 GR
Q209
KTC3199 GR
1
2
3
Q805
KRC107 M
2
3
Q804
KTA1266 GR
SWITCHING
Q2
A102 M
UNER
THCING
Q211
KTC3199 GR
Q212
KTC3199 GR
Q205
KTC3199 GR
Q206
KTA1046 Y
Q207
KTC3199 GR
Q203
KTA1266 GR 
C240
0.1(ML)
Q201
KTC3199 GR 
Q202
KTC3199 GR 
VDD
11
11
10
10
9
9
7
7
6
6
5
5
4
4
1
1
2
2
3
3
8
8
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
10
10
11
11
SW808
VOLUME DOWN
SW807
VOLUME UP
UN801
REMOTE SENSOR
N64H380A
3
1
2
3
DC 4.5V ["AA" size (UM/SUM-3,R6 or
HP-7) battery x 3 for backup memory]
BATTERY
LCD DISPLAY
TERMINAL A PWB-A5/
TERMINAL B PWB-A6
MAIN PWB-A1
5.0V
0.6V(TUN: 5.0V)
4.9V(TUN: 0V)
0V
5.0V(TUN:0V)
0V(TUN: 5.0V)
 
5.0V
2.5V
2.5V
2.5V
2.5V
2.5V
2.5V
2.5V
2.5V
2.5V
2.5V
2.5V
2.5V
2.5V
2.5V
2.5V
2.5V
5.0V
0V(TUN: 4.9V)
5.0V
(TUN:0V)
0V
GND
GND
GND
GND
GND
GND
GND
0V
0V
0V(TUN:5.0V)
0V(X-BASS OFF:4.9V)
4.4V(TUN:0V)
GND
3.7V
(TUN:0V)
1.9V
(TUN:0V)
0V
1.5V
(TUN:0V)
3.7V
(TUN:0V)
1.9V
(TUN:0V)
1.7V
(TUN:0V)
GND
1.9V(TUN:0V)
1.9V(TUN:0V)
4.4V(TUN:0V)
1.9V(TUN:0V)
1.9V(TUN:0V)
0.9V(TUN:0V)
1.9V(TUN:0V)
0.7V(TUN:0V)
1.9V(TUN:0V)
1.9V(TUN:0V)
1.9V(TUN:0V)
1.9V(TUN:0V)
1.9V(TUN:0V)
0.5V(TUN:0V)
0V
1.9V(TUN:0V)
1.9V(TUN:0V)
3.7V(TUN:0V)
0V
4.4V(TUN:0V)
GND
GND
2.0V(TUN:0V)
(TUN:0V)
4.4V
(TUN:0V)
GND
2.2V
(TUN:0V)
2.1V
(TUN:0V)
4.2V(TUN:0V)
2.1V(TUN:0V)
2.2V(TUN:0V)
GND
GND
GND
5V
5V
5V
2.5V
2.4V
GND
5.0V
2.3V
2.3V
2.3V
2.3V
5.0V
5.0V
4.4V
GND
0V
(TUN:7.5V)
4.4V
SWITCHING
RECORD SIGNAL
PLAYBACK SIGNAL
CD SIGNAL
FM SIGNAL
AM SIGNAL
13
12
5
7
1
6
11
14
15
4
17
16
R AMP.
IC202
ELECTRONIC
VOLUME
TC9260P
+
-
+
-
SW201
FUNCTION
SELECTOR
SW201
FUNCTION
SELECTOR
1
2
SW801
PLAY/PAUSE/
TUNING UP
SW802
STOP/
TUNING 
DOWN
SW803
REPEAT/
BAND
SW804
TUNER/
MEMORY
SW805
CUE/
PRESET
UP
SW806
REVIEW/
PRESET
DOWN
+B
+B
+B
+B
+B
+B
+B
+B
+B
+B
+B
+B
+B
+B
+B
+B
+B
+B
+B
+B
+B
+B
+B
+B
+B
5.0V
0.4V)
GND
(CD: OPEN)
8.2V-
8.4V
4.5V-
4.2V
8.6V-
8.0V
GND
0.6V
0V
0V
0.6V
5.0V-
4.6V
8.6V-
8.0V
4.5V-
4.2V
9.0V
GND
GND
GND
2.5V
2.5V
0V
2.5V
GND
0V
0V
0V
2.5V
2.5V
2.5V
2.5V
2.5V
4.6V
0V
0V
(REC: 4.0V)
0.4V)
 OSC.
0V
GND
0V(OFF:0.6V)
0V(OFF:0.6V)
0V
GND
0.2V
0.2V
2.0V
2.0V
0.8V
0.8V
0.V
0V
GND
GND
0V(ON:0.6V)
0V(ON:0.6V)
4.8V(ON:4.4V)
0V
(ON:4.4V)
4.4V(ON:3.8V)
SWITCHING MUTE
MUTE
MUTE
9V
7.5V
8.4V
7.0V
8.4V
0V
7.5V REGULATOR
7.5V 
REGULATOR
7.5V
5.0V
7.0V
4.4V
7.0V
4.9V
Q204,Q205:5V 
REGULATOR
Q211,Q212 
LINE AMP
R859
47K
R880
22K
QT-CD250H
ONLY
F651
T1.25A L
250V
SW651
VOLTAGE
SELECTOR
AC220-240V
AC110-127V
AC110V-127V/
220V-240V,50/60Hz
T651
POWER
TRANSFORMER
SELECTOR
AC/DC 
AC  INPUT
FOR QT-CD250W
SO651
AC INPUT
SOCKET 
For U.K./Europe/Australia/New Zealand; 
AC230-240V,50Hz
For Philippines; AC220V,60Hz
FOR QT-CD250H
QT-CD250W
ONLY
UN801
QT-CD250H/W
– 16 –
Figure 16 WIRING OF P.W.BOARD (1/2)
A
B
C
D
E
F
G
H
1
2
3
4
5
6
• The numbers   
1 
 to 
17 
 are waveform numbers shown in page 19.
2
3
4
5
1
7
8
9
6
12
13
14
15
11
10
16
2
3
1
CNS801
SW809
X-BASS
R808
C810
R809
UN801
R857
SW808
VOLUME
DOWN
R855
SW805
CUE/
PRESET UP
SW801
PLAY/PAUSE/
TUNIG UP
FW802
R847
R841
LCD801
R849
R848
SW802 
STOP/TUNING
SW803 
REPEAT/
BAND
R246
C247
R245
R248
Q212
C231
R244
R247
C244
Q211
R240
R243
C242
CNP801
C243
R236
R239
R238
C241
R234
R235
SW804 
TUNER/
MEMORY
C224
R237
R233
C223
Q210
Q209
R241
C245
R74 
R242
R73 
R458
SW201 
R856
SW806
DOWN/
REVIEW/
PRESE
FW801
SW807
VOLUME
UP
C51 
X51 
R62 
R61 
IC51
R60 
R59 
R58 
R55 
R13 
R76 
R51 
Q2
C75 
R873
R877
COR801
R878
R875
R879
R872
R871
R843
R846
R876
R882
C865
R883
R884
R885
R888
R886
R889
R887
R890
R891
R893
R892
R894
R895
R898
R899
R900
R901
X802
X801
R839
C845
C846
R842
R844
Q805
R825
C832
L801
C853
R835
D806
R862
C847
C848
Q804
C844
R836
R860
R854
C849
C850
R837
R838
C851
C852
R455
R456
D805
D803
R214
R457
R250
Q203
C207
R253
ZD203 
C220
R216
R215
C214
Q202
R212
R225
R224
C235
C246
R223
Q201
R231
R207
IC202 
C215
R211
C219
R219
C217
R217
R209
C213
R251
C208
R210
C229
R221
C205
R213
C232
C230
R252
R249
CNP201
R125
C120
C123
R124
R119
C121
D102
R123
R117
C117
IC101 
C105
R105
D101
R115
C115
R113
C113
R109
C109
C111
R121
R104
R101
L107
C107
R103
CNP101
C351
L301
R351
C354
C108
R102
L108
R352
R116
C106
R106
R354
Q351
R353
C353
C352
C112
C110
R110
C114
R114
C116
R126
R118
C118
R122
C119
R120
C122
C233
C234
CNP602
C239
C226
C240
C201
D201
C237
C238
IC201 
C225
R232
C236
C221
C222
C210
C302
C227
C212
D801
C837
R812
C854
C825
C821 C822
C813
R803
C836
R834
C814
R833
C818
R832
R831
R807
R830
C819
R829
C829
C863
C816
C833
R828
C841
R805
C804
R806
C820
C801
C828
R804
C815
C802
C830
R801
Q801
C817
R826
R824
C827
R827
C826
R820
C824
C838
C839
C835
C834
C842
C843
L803
R852
R868
R867
Q806
R870
R845
R866
D802
R869
IC803 
Q803
R851
D804
BI803 
R850
L807
TC1
R1
C27 
C10 
R8
R7
C9
C29 
VD3 
C12
C11 
R2
L1
R6
R54
C8
C61
C6
C54
VD2
L2
R5
C7
R4
L51
C56
C53
R12
IC1
R53
C60
C23
C21
C59
R52
C55
C20
C52
C22
C26
C24
R15
R18
Q1
R16
R17
C19
R71
C73
C74
R72
C72
C71
C16
C25
CF4
CF1
C14
CF3
R10
T3
C13
D1
F1
C3
VD1
C2
R3
C1
C856
R865
Q802
C806
COR1
C807
R853
BI801
R802
BI802
R811
R204
D204
D205
C211
R202
Q204
R201
D203
D202
C204
R203
R205
Q206
ZD202
ZD201
C209
Q207
C206
R206
Q205
C203
C202
C249
R228
R227
R254
C216
R222
R218
C218
R220
R861
C15
R840
2
3
4
5
1
6
7
8
9
12
13
14
11
10
1   2   3
2
3
4
5
1
7
8
9
6
12
11
10
1   2   3   4
A
B
C
D
E
F
G
H
E
C
B
E
C
B
E
C
B
B
C
E
E
C
B
B
C
E
B
C
E
B
C
E
B   C   E
B   C   E
B   C   E
B   C   E
E   C   B
E   C   B
E   C   B
4
3
2
1
B
C
A
D
3
2
1
80
81
1
5
10
15
20
25 35
40
45
55
60
65
70
75
85
90
95
51
50
3031
8
1
15
10
5
25
30
1
20
16
E
C
B
1
2
3
3
2
1
B
C
E
11 12
10
5
20
22
1
15
3   2   1
2
3
1
3   2   1
L4
1
10
5
12
24
20
15
13
1
6
BR
BR
3
2
1
HPJ201
HEADPHONES
PLAY
REC
SW102
RECORD/
PLAYBACK
1     2     3
1
5
10
15
20
1
1
11
12
1
1
11
12
GY
GY
100
D807
R880
R859
QT-
CD250H 
ONLY
CF2
1
2
3
C870
C864
IC802 
R896
R897
C862
R863
R864
R821
C840
C872
IC801
C823
C805
C5
C32
C68
C18
R14
C58
R20
C34
R77
C33
13
12
15
10
5
20
24
1
5
1
1
2
3
4
C57
SPEAKERS
SP201
SP202
R-CH
L-CH
CNS201
GY
BK
RD
MAIN PWB-A1
CD CONTROL
PWB-A2
SWITCH
PWB-A4
L3 
AM BAR ANTENNA
BK
GY
GY
GY
GY
GY
1
2
3
4
5
8
7
6
5
4
3
2
1
BR
WH
WH
WH
WH
WH
WH
WH
WH
WH
WH
WH
BR
CNS802
CNS801
SW810
CD LID
OPEN/CLOSE
SW201
FUNCTION
SELECTOR
TUNER
TAPE
OFF
POWER ON
CD
5
1
7
8
6
14
15
11
17
16
10
2
3
9
12
13
4
BK
BL
(255)
TO 
SP202
(R-CH)
Page of 40
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