MZ-B50
– 31 –
– 32 –
A/D, D/A CONVERTER
IC301
EEPROM
IC802
02
• SIGNAL PATH
: REC (ANALOG IN)
: PLAY
: REC (DIGITAL IN)
RESET
ANALOG REC
VR B+
VC B+
VC B+
B+ SWITCH
Q305, 306
B+ SWITCH
Q302
MIC AMP
IC302
LINE/HP AMP
IC303
LINE/HP OUT
ON/OFF SWITCH
Q101, 201
MUTING
Q102, 202
MUTING
CONTROL SWITCH
Q308
LINE/HP OUT ON/OFF
CONTROL SWITCH
Q307, 309
+2.5V
REGULATOR
IC304
+2.5V
REGULATOR
IC305
BEEP TONE
BUFFER
Q301, 303
DADT
DADT, XBCK,
LRCK, FS256
6
XBCK
3
LRCK
2
FS256
1
SRDT, SWDT,
SCLK
SWDT
SCLK
SRDT
SWDT
SCLK
SRDT
RMC KEY
HIGH-PASS
FILTER
DPGA
DBB
D/A
CONVERTER
A/D
CONVERTER
AUDIO
INTERFACE
CONTROLLER
CONTROL
REGISTER
INTERFACE
CLOCK
DIVIDER
DIGITAL REC
SUB
TRACTION
LOW-PASS
FILTER
BATT B+
BACK-UP BATT B+
D804
D801
VDD
X802
32.768kHz
RMC DTCK
RVCC
DTCK
KEY-R
RGND
VC B+
LIN1
ADCL
ADCR
LOUT1
ROUT1
PGAL
PGAR
OPGAL
OPGAR
STDI
4
STDO
BCLK
LRCK
MCLK
18
CDTI
16
CCLK
17
CDTO
15
62
61
DO
DI
SK
XCS
XCS NV
VRAD
BEEP
XHP STBY
XCS
ADA
2
9
8
10
4
3
2
1
38
VRDA
35
19
XHP DET
23
18
MUTE
56
LIN2
53
RIN1
55
RIN2
52
LOUT2
37
ROUT2
36
33
32
47
43
34
31
48
42
110
XPD
ADA
111
119
REAL TIME CLOCK
IC804
SWDT
SCLK
SRDT
SDO
SDI
OSCIN
OSCOUT
X801
16.9344MHz
46
45
EXT
AL
XT
AL
SCK2
CS-RTC
CS RTC
3
4
7
118
OPT DET 113
XOPT CONT 117
XJACK DET 114
XMIC DET 115
XRST
PD
(LINE IN JACK)
+
+
OPTICAL
RECEIVER
J304
i
/REMOTE
J301
LINE IN
(OPTICAL)
XCS
DC/DC
CONVERTER
IC803
Q809
SYSTEM CONTROLLER
IC801
(2/3)
116
VOLUME
RV301
VOICE UP
IC307,
Q313, 318
SWITCH
Q319
SWITCH
Q320
MUTING
Q326, 327
MUTING
CONTROL SWITCH
Q325
Q321
SWITCH
Q310
VC
B+
2
SP AMP
IC313
PWR
OUT1
PWR
OUT2
BASE
OUT
11
8
15
16
13
6
14
1
IN1
IN2
MUTE
OUT1
STNBY
SWITCH
Q316
SWITCH
Q304, 305
SP
VCC
SP AMP
42
SWITCH
Q312
SWITCH
Q106,
Q206
SWITCH
Q338
SWITCH
Q322
EQ
SWITCH
Q103, 203
MIC AMP
IC308
+2.5V
REGULATOR
IC309
SWITCH
Q104,
Q204
SWITCH
Q337
EQ
SWITCH
Q107, 207
SWITCH
Q105, 205
SWITCH
Q328
S301
MIC SENS
H
L
SWITCH
Q335, 336
BUFFER
IC310
VOR
SWITCH
Q330-332
Q334
+30dB AMP
IC311
VOR
IC306
Q311
SWITCH
Q314, 333
S805
REC MODE
STEREO
MONO
42
VOR
34
MONO
72
VOR OUT
71
VOICE UP
MIC AMP
37
41
SWITCH & LCD
MODULE UNIT
(1/2)
L MIC
R MIC
SP A
SP B
MAIN BOARD (2/3)
MIC1
MIC
MIC2
MIC
SP1
SPEAKER
J303
MIC
(PLUG IN POWER)
B
A
C
F
D
H
6-3. BLOCK DIAGRAM – MAIN Section (2/3) –