Block Diagram - Audio Section - Sony BM-21 Service Manual

4-1. BLOCK DIAGRAM – AUDIO SECTION –
MIC901
MIC
J101
MIC
PLUG IN POWER
HRP901-1
AUDIO HEAD
HE901
ERASE HEAD
HRP901-2
4
LETTER HEAD
IC501
6 7
LETTER PB AMP
Q519
SWITCH
S503 Q504, Q505, Q523
E-INDEX E-INDEX
LCD701
22 OSC
X701
1MHz
23 OSC
SEG-1 SEG 0
I I
SEG-8 SEG7
Q701 - Q703
COM-1 21 COM3
LCD DRIVER
SYSTEM CONTROLLER
Q704 - Q706
COM-2 6 COM2
LCD DRIVER
Q707 - Q709
COM-3 5 COM1
LCD DRIVER
3VIN
BM-21/23
S103
MIC SENS
CONF DICT
1
23 17
12
22
IC101
13
PRE AMP
S101 (1/4)
LISTEN DICT STOP
Q101, T101
15
BIAS OSC
10
REC +B
S602 (2/2)
TAPE SPEED
2.4cm 4.8cm
Q501, Q502
AMP CONTROL
S101 (2/4)
LISTEN DICT STOP
PLAY +B REC +B
+B
REC +B
Q161 - Q163
LED CONTROL
D703
Q506 DICT/BATT
PLAY +B
INVERTER
Q512
SWITCH
BS 10
S401
(BACK SPACE)
3V IN
S701
Q711
IN.CTL 4 COUNTER
SWITCH
RESET
D702
D701
IC701
Q712
INVERTER
BATT1 7
Q713
INVERTER
Q715
INVERTER
BATT2 8
Q714
INVERTER
PHOTO 9
D507
POWER 3
S502
LOCK
3VOUT
Q710
ON
SWITCH
3VOUT
DC-DC CONVERTOR
OFF
S501
VR101
CUE / REVIEW
OFF ON
Q103 VOLUME
ATT
Q104, Q106 Q102, Q107
MUTE MUTE CONTROL
Q105
REC 3V
COMP
S504
VOR
PLAY +B
Q508, Q510, Q520
PLAY +B
VOR
5
RECOVERY Q507
OUT2 7
1 INPUT SWITCH
TIME CAP
IC503 OUT1 6
Q509
VOR
INVERTER
Q1, Q4
MUTE SW
+B
Q516 Q606, Q608
LED CONTROL VOR CONTROL
Q517, Q518
3V IN
BATT DET
IC502
BATT VOLTAGE DET
1 OUT1
2 OUT2
Q511
VCC 8 BATT
SWITCH
D503
IC504
BATT
11 11
IC102
POWER AMP
4 IN(-) 5
OUT(+)
OUT(-) 8
1 SHUTDOWN
IC103
POWER AMP
4 IN(-) OUT(-) 8
5
OUT(+)
VCC3V 1 SHUTDOWN
Q112
REC+B
SWITCH
Q111
(FF/BACK SPACE)
INVERTER
MOTOR SERVO
S101(3/4)
14 VREF
LISTEN
DICT STOP
TH601
S601 (1/2)
RV601
TAPE
Q2, Q3, Q5
SPEED ADJ
ALARM
4.8cm
15 IN+
RV602
TAPE
SPEED ADJ
2.4cm
S602(1/2)
TAPE SPEED
2.4cm 4.8cm
Q610
SWITCH
PLAY +B
Q611
SWITCH
Q601 - Q603,
Q607
Q605, Q612, Q613
SWITCH
SERVO CONTROL S101 (4/4)
LISTEN DICT STOP
VCC3V
REC3V
TAP ADJ.
Q503, Q513 - Q515
PHOTO REFLECTOR
PH501
DET
PHOTO
3 1
COUPLER
4 2 Q522
SWITCH
Q521
SWITCH
BM-21/23
EAR
J102
SP501
SPEAKER
S402
+B
IC601
+B
UOUT 4
M M901
VOUT 5
MOTOR
WOUT 6
S/S 13
S601 (2/2)
+B
S102
Q109, Q110
(POWER)
VCC 3V
SWITCH
BATT
DRY BATTERY
SIZE "AA"
(ICE DESIGNATION)
2PCS, 3.0V
CN102
DC IN 3.0V
Signal Path
: PB (LISTEN)
: REC (DICT)