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6-3.
BLOCK DIAGRAM – MAIN Section –
MAIN BOARD (3/3)
VOLUME BOARD
CD/TUNER SELECT SWITCH
CN301
CN302
IC320
(1/2)
(1/2)
CD
1
7
L-CH/R-CH
CD L-CH
A
11
10
D321
(Page 14)
12
MUTING
–1
TUNER
TUNER
Q120
L-CH/R-CH
L-CH
C
8
9
RV301
(Page 16)
6
VOLUME
CD R-CH
2
6
1
2
B+
MUTING
13
–2
(CD 5V)
Q220
TUNER R-CH
4
3
TUNER ON
RV302
D
5
MEGA BASS
(Page 16)
D320
MUTING CONTROL
A MUTE
53
SWITCH
Q320
D417
MEGA BASS ON
BASS ON
20
DRIVE
Q406
POWER ON
35
BUZZER
49
D416
MUTING CONTROL
V MUTE 52
SWITCH
Q407
LIQUID CRYSTAL DISPLAY
LCD401
70 – 80, 1 – 10
21 – 23
SEG1 – SEG21
COM0 – COM2
SYSTEM CONTROLLER
61
58
59
60
55
56
X402
4.194MHz
CT401
X401
32.768kHz
LED BOARD
MAIN
CLOCK
B+ (µ 5V)
D422 – 424
D419 – 421
Q401
Q402
(LCD BACK LIGHT)
(LCD BACK LIGHT)
Q401, 402
Q403 – 405
SHIFT CLOCK
LED DRIVE
Q405
Q403
HIGH
LOW
Q404
B+ (µ 5V)
S423
BRIGHTNESS
05
– 17 –
POWER BOARD
POWER AMP
(FOR FRONT SPEAKER/HEADPHONE)
CN302
CN301
CN304
IC350
(2/2)
(2/2)
(1/2)
5
3
6
L-CH
IN1
OUT1
+
10
1
+
2
6
8
IN2
OUT2
R-CH
+
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
(1/2)
HEADPHONE
MUTE DRIVE
4
BUZZER
Q352
VOICE
D350
MUTE
Q350, 351
2
V MUTE
Q353
SPEAKER SWITCH
MUTE
CD 6V
MOTOR/COIL
DRIVER (IC503) B+
IC401 (2/2)
µ 5V
KS0 – KS3
KEYRET0 – KEYRET4
(SYSTEM CONTROLLER (IC401) B+)
13 – 16
63 – 67
17, 18
38
36
68
D412, 413
RESET SIGNAL
GENERATOR
IC402
D404
D401
CD 5V
(CD SECTION B+)
CN401
3
5
7
9
10
8
6
4
2
BP
(CD TEST AUTO)
8
6
4
2
1
3
5
7
9
CN402
KEY MATRIX
TUNER SECTION B+
S401 – 420
KEY BOARD
– 18 –
• SIGNAL PATH
: CD PLAY
: TUNER (FM/MW/LW)
CN306
4
SP101
L-CH FRONT
3
SPEAKER
Q151, 251
Q151
SPEAKER ON
SWITCH
1
SP201
R-CH FRONT
2
SPEAKER
Q251
CN307
1
SP301
2
MEGA BASS
SPEAKER
5
CN305
1
2
3
J301
2
4
(HEADPHONE)
6
HEADPHONE
MUTE
Q150, 250
HEADPHONE
BOARD
SPEAKER
SWITCH DRIVE
Q354, 355
POWER AMP
(IC350, 351) B+
CN303
(2/2)
+6V
9
T901
REGULATOR
POWER
Q902
TRANSFORMER
D415
+5V
LINE
6
RECT
REGULATOR
FILTER
D905 – 908
Q901
LF901
AC IN
7
CD B+
SWITCH
Q903
3
D911
5
RECT
D903, 904
CN304
(2/2)
5
5V
4
RECT
VT B+
D901, 902
– 19 –
ICF-CD873L
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