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6-3.
BLOCK DIAGRAM – MAIN Section –
VOLUME BOARD
MAIN BOARD (3/3)
CD/TUNER SELECT SWITCH
CN301
CN302
IC320
(1/2)
(1/2)
CD
L-CH/R-CH
1
7
CD L-CH
A
11
10
D321
(Page 16)
12
MUTING
–1
TUNER
TUNER
Q120
L-CH/R-CH
L-CH
C
8
9
RV301
(Page 18)
6
VOLUME
2
6
CD R-CH
1
2
B+
13
MUTING
–2
(CD 5V)
Q220
TUNER R-CH
4
3
TUNER ON
RV302
D
5
MEGA BASS
(Page 18)
D320
MUTING CONTROL
A MUTE
53
SWITCH
Q320
D417
MEGA BASS ON
BASS ON
20
DRIVE
Q406
POWER ON
35
BUZZER
49
(US)
CSV (COMPUTER SOUND VOICE)
PROCESSOR
LED BOARD
IC601
DATA
46
15
SO
AOUT
23
CLK
47
14
SI
LAT
48
8
ST
HIGH
D422 – 424
(LCD BACK LIGHT)
V-RESET
50
17
RST
NAR
51
22
NAR
MID
LOW
BUSY/COLOR
61
20
BUSY
B+
Q601
Q602
(µ 5V)
XT
XT
Q403 – 405
2
3
Q601, 602
S422
LED DRIVE
X601
ATTENUATE
SOUND LEVEL
4.19MHz
SWITCH
Q405
HIGH
LOW
(EXCEPT US)
B+
(µ 5V)
S423
BRIGHTNESS
SEG1 – SEG21
COM0 – COM2
70 – 80, 1 – 10
21 – 23
59
58
60
56
55
X401
X402
32.768kHz
4.194MHz
CT401
CT401
LIQUID CRYSTAL DISPLAY
MAIN
Q402
LCD401
CLOCK
Q401
Q401, 402
SHIFT CLOCK
05
– 19 –
POWER BOARD
POWER AMP
(FOR FRONT SPEAKER/HEADPHONE)
CN301
CN302
CN304
IC350
(2/2)
(2/2)
(1/2)
5
3
6
L-CH
IN1
OUT1
+
10
1
+
2
6
8
R-CH
IN2
OUT2
+
8
3
3
5
10
VOL IN
POWER AMP
1
7
(FOR MEGA BASS SPEAKER)
IC351
9
VOL OUT
IN+
OUT
12
3
IN–
OUT
10
MEGA BASS
SW
MUTE
8
Q321
2
BASS ON
1
POWER ON
POWER ON
MUTE DRIVE
Q904
D351
CN303
HEADPHONE
(1/2)
MUTE DRIVE
4
BUZZER
VOICE
D350
MUTE
Q350, 351
2
D419 – 421
V MUTE
(LCD BACK LIGHT)
B+
Q353
(µ 5V)
SPEAKER SWITCH
MUTE
(US)
MUTING CONTROL
Q403
SWITCH
KS0 – KS3
KEYRET0 – KEYRET4
Q407
13 – 16
63 – 67
Q404
D416
D404
D401
(EXCEPT US)
52
CN401
3
5
7
9
10
8
6
4
2
SYSTEM CONTROLLER
IC401 (2/2)
8
6
4
2
1
3
5
7
9
CN402
NOTE 1
KEY MATRIX
S401 – 420
KEY BOARD
– 20 –
CN306
4
SP101
3
L-CH FRONT
SPEAKER
Q151, 251
Q151
SPEAKER ON
SWITCH
1
SP201
R-CH FRONT
2
SPEAKER
Q251
KH301
1
SP301
2
MEGA BASS
SPEAKER
5
CN305
1
2
3
J301
4
2
6
(HEADPHONE)
HEADPHONE
MUTE
Q150, 250
Q352
HEADPHONE
BOARD
SPEAKER
SWITCH DRIVE
Q354, 355
CN303
(2/2)
CD 6V
MOTOR/COIL
9
DRIVER (IC503) B+
µ 5V
D415
SYSTEM CONTROLLER (IC401),
6
CSV (IC601) B+
17
19
38
36
68
CSV (IC601): US model only
RESET SIGNAL
D408 – 411, 418
GENERATOR
(Refer to NOTE 1.)
IC402
BUZZER
7
CD B+
CD 5V
SWITCH
(CD SECTION B+)
Q903
BIRD
3
(US)
RIVER
D405
KR0
BP
(CD TEST AUTO)
KR1
D406
KR2
D407
5
S421
SOUND MODE
CN304
(2/2)
5
D408
KR3
Australian model
5V
D409
KR4
Italian model
TUNER SECTION B+
4
VT B+
D410
KR0
US model
KR1
D411
Canadian model
D418
KR2
All models
• SIGNAL PATH
: CD PLAY
: TUNER (FM/AM)
POWER AMP
(IC350, 351) B+
+6V
T901
REGULATOR
POWER
Q902
TRANSFORMER
+5V
LINE
RECT
REGULATOR
FILTER
D905 – 908
Q901
LF901
AC IN
D911
RECT
D903, 904
RECT
D901, 902
– 21 –
ICF-CD873
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