Block Diagram - Main Section - Sony WM-GX221 Service Manual

WM-GX221
6-2. BLOCK DIAGRAM – MAIN SECTION –
TU L, TU R
B
IC501 (1/2)
MIC AMP, ALC
J501
MIC
(PLUG IN POWER)
IN (L) MIC
ALC
21
MIC
AMP
MIC
IN (R)
MIC
ALC
19
AMP
MIC501
FLAT MIC
S301 (1/4)
(REC/PB)
PRE AMP, POWER AMP, MEGA-BASS
REC PB
HRP901
(REC/PB)
FWDIN (L)
9
L-CH
10
REVIN (L)
S301 (2/4)
(REC/PB)
REC PB
FWDIN (R)
11
R-CH
12
REVIN (R)
VREF 13 VREF
HE901
(ERASE)
S301 (3/4)
(REC/PB)
REC PB
T551
BIAS OSC
Q553
REC
BIAS OSC
Q551
ISS
SWITCH
3
S551
2
ISS
MAIN VCC
1
BATT B+
COM
M601
(CAPSTAN/REEL)
U
W V
Q708, 716 Q601, 602
MOTOR MOTOR
BRAKE SWITCH CONTROL SWITCH
S702 OFF
PAUSE
MAIN VCC
ON
TU L TU R
IC501 (2/2)
REC/PB AMP
MIC BUF PB
OUT (L) IN (L) OUT (L)
+
16 14 PB AMP
REC
OUT (L)
REC AMP
PB
MIC BUF
IN (R) OUT (R)
OUT (R)
+
17 13 PB AMP
REC
OUT (R)
REC AMP
LINE SW
MODE
REC SW
CONTROL
CIRCUIT PW SW
MAIN VCC
S1 (2/2)
NORM
IC301 (1/2)
CrO /METAL
2
PRE-OUT (L)
EQ
+
5
AMP
PRE-NF (L)
6
Q301
TAPE EQ
PRE-NF (R)
SWITCH
8
PRE-OUT (R)
EQ +
7
AMP
S301 (4/4) LOW
(REC/PB) BOOST
REC PB
MAIN VCC
32
PB/REC
S303
SOUND BOOST
Q552
OFF
SWITCH
ON
TH601
COMPARATOR
IN+
OUT 35
+
37
VSP
–
36
SPEED
CONTROL
M-VREF
UOUT
39
MOTOR SWITCH &
OSC
VOUT
40 DRIVE REFERENCE
LOGIC
CIRCUIT
WOUT
CIRCUIT CIRCUIT VOLTAGE
41
CAPSTAN/REEL
47
Q453
SWITCH
8
Q452
PB MUTE
2 SWITCH
PB/REC
+
9
3
15 TU B+
MAIN VCC
11 PB/REC
12 REC VCC
Q705
H/P MUTE
SWITCH
MIX-IN (L) MIX 1
30 + MIX-OUT (L)
24
–
Q302
AVLS
SWITCH
MIX 2
– MIX-OUT (R)
MIX-IN (R)
25
+
29
NF
–
+
L
DET
R
CONTROL
VREF
21 15
MAIN VCC
Q704
PRE MUTE D701
SWITCH
Q707
POWER MUTE
H/P MUTE
SWITCH
MAIN VCC
RV602
TAPE SPEED
(DOUBLE)
S601
NORM
2X REC TIME
DOUBLE
RV601
TAPE SPEED
(NORM)
34
BIAS Q703, 711
S/S
PB/REC
3 START/STOP
CONTROL SWITCH
IC301 (2/2)
MOTOR DRIVE
PB/REC PAUSE
Q702
12 12
D401
REC/BATT
MAIN VCC
IC151
POWER AMP
Q152
15
–
PRE AMP
+
13
–
+
Q252
6
–
PRE AMP
+
8
S304
–
AVLS
+
NORM
SHUT DOWN
1
LIMIT
S701 (1/2) S701 (2/2)
MAIN VCC
i
BATT B+
SPEAKER
H/P MUTE
RV301
VOL
POWER
POWER
IN (L) OUT (L)
POWER
22 16
AMP
POWER POWER
IN (R) OUT (R)
POWER
23 20
AMP
POWER
VREF 18
AMP
PB/REC
Q712, 713
TU B+ TU VCC
B+ SWITCH
Q701,715
REC VCC
B+ SWITCH
PB/REC
MAIN VCC
Q401, 403
Q501, 502
MIC B+ RIPPLE
B+ SWITCH
FILTER
REC VCC
Q402
SWITCH
TU B+
S704
(TAPE POWER)
(ON at FF/REW/PLAY modes.)
SP151
16
(SPEAKER L-CH)
18
5 SP251
(SPEAKER R-CH)
3
TU B+
Q710
SWITCH
PB/REC
J301
i
(HEADPHONE)
ANT
A
• SIGNAL PATH
: TUNER (FM/AM)
: TAPE PLAY
: TAPE REC
: MIC INPUT
BATT B+
DRY BATTERY
SIZE ''AA''
S703
(IEC DESIGNATION R6)
FUNCTION
2PCS. 3V
RADIO
TAPE
J401
(RADIO OFF)
DC IN 3V
– +