Read Sony HS-JM450 Service Manual online
12
12
HS-JM450
6-2. BLOCK DIAGRAM – MAIN SECTION –
• SIGNAL PATH
: TUNER (FM/AM)
: TAPE PLAY
: TAPE REC
: MIC INPUT
+
–
MIC AMP, ALC
IC501 (1/2)
REC/PB AMP
IC501 (2/2)
PRE AMP, POWER AMP, MEGA-BASS
IC301 (1/2)
POWER AMP
IC151
TU L, TU R
TU L
TU R
A
S704
(TAPE POWER)
(ON at FF/REW/PLAY modes.)
S703
FUNCTION
SP151
(SPEAKER L-CH)
(SPEAKER R-CH)
SP251
POWER MUTE
SWITCH
Q707
MIX-OUT (L)
MIX-OUT (R)
POWER
IN (L)
IN (L)
POWER
IN (R)
IN (R)
POWER
OUT (L)
POWER
OUT (R)
POWER
OUT (COM)
VREF
L
R
MIX-IN (L)
MIX-IN (R)
PRE-OUT (L)
L-CH
HE901
(ERASE)
FWDIN (L)
REVIN (L)
HRP901
(REC/PB)
REC VCC
TU B+
BUF
IN (L)
IN (L)
PB
OUT (L)
REC
OUT (L)
BUF
IN (R)
IN (R)
MIC
IN (L)
IN (L)
MIC
OUT (L)
MIC
IN (R)
IN (R)
PRE-NF (R)
PRE-NF (L)
15
13
16
+
–
18
+
–
3
+
–
6
8
5
1
POWER
MUTE
21
SYSTEM
15
8
6
18
20
16
25
24
23
22
30
29
5
9
10
15
8
2
14
13
16
21
19
+
+
+
+
ALC
MIC
AMP
PB AMP
REC AMP
MIC
OUT (R)
17
ALC
MIC
AMP
B+
SWITCH
Q401, 403
B+ SWITCH
Q501, 502
B+ SWITCH
Q701,715
B+ SWITCH
Q712, 713
PRE AMP
Q152
PRE AMP
Q252
START/STOP
CONTROL SWITCH
REC
BIAS OSC
Q553
PRE MUTE
SWITCH
Q704
B+ ON/OFF
Q402
SWITCH
Q710
SWITCH
Q453
TAPE EQ
SWITCH
SWITCH
Q301
AVLS
SWITCH
Q302
NF
DET
CONTROL
L.B-SW
32
LOW
BOOST
J501
(PLUG IN POWER)
MIC
FLAT MIC
RV301
VOL
SWITCH
Q552
PB
OUT (R)
REC
OUT (R)
9
3
EQ
AMP
POWER
AMP
POWER
AMP
POWER
AMP
MODE
CONTROL
CIRCUIT
PB AMP
REC AMP
11
12
PW SW
REC SW
R-CH
S301 (1/4)
S301 (2/4)
REC
PB
(REC/PB)
REC
PB
(REC/PB)
REC
PB
S301 (4/4)
(REC/PB)
S701 (2/2)
S701 (1/2)
REC
PB
S301 (3/4)
(REC/PB)
NORM
LIMIT
CrO
2
/METAL
NORM
S1 (2/2)
OFF
ON
OFF
ON
SUPER BASS
S303
NORM
DOUBLE
2X REC TIME
S601
AVLS
S304
PAUSE
S702
PRE-OUT (R)
FWDIN (R)
REVIN (R)
VREF
VREF
7
11
12
13
EQ
AMP
+
–
–
+
–
+
–
VREF
MIX 2
MIX 1
T551
BIAS OSC
S551
ISS
3
2
1
J301
(HEADPHONE)
i
i
+
–
–
SPEED
CONTROL
MOTOR
CONTROL SWITCH
Q601, 602
MOTOR
BRAKE SWITCH
Q708, 716
NOISE CUT
NOISE CUT
TU VCC
Q717
Q718
CAPSTAN/REEL
MOTOR DRIVE
IC301 (2/2)
M601
(CAPSTAN/REEL)
MOTOR
DRIVE
CIRCUIT
SWITCH &
LOGIC
CIRCUIT
BIAS
REFERENCE
VOLTAGE
OSC
CIRCUIT
TH601
TAPE SPEED
(NORM)
RV601
TAPE SPEED
(DOUBLE)
RV602
S/S
M-VREF
IN+
COMPARATOR
VSP
OUT
OSC
3
34
47
35
36
37
WOUT
41
VOUT
40
UOUT
W
V
U
39
SPEAKER
DRY BATTERY
SIZE ‘‘AA’’
(IEC DESIGNATION R6)
2PCS. 3V
RADIO
TAPE
(RADIO OFF)
D401
J401
DC IN 3V
–
+
MIC501
Q551
ISS
SWITCH
MAIN VCC
LINE SW
PB/REC
TU B+
TU B+
PB/REC
PB/REC
PB/REC
PB/REC
PB/REC
PB/REC
PB/REC PAUSE
D701
MAIN VCC
MAIN VCC
MAIN VCC
MAIN VCC
MAIN VCC
MAIN VCC
MAIN VCC
MAIN VCC
BATT B+
COM
Q702
Q703, 711
MIC B+
REC VCC
REC VCC
TU VCC
MAIN VCC
BATT B+
BATT B+
TU B+
H/P MUTE
SHUT DOWN
H/P MUTE
SWITCH
Q705
PB MUTE
SWITCH
Q452
H/P MUTE
+
REC/BATT
TUNER Section
(Page 11)
B
TUNER Section
(Page 11)
Ver. 1.2
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