Read Sony HS-JM400 Service Manual online
12
12
HS-JM400
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
C
D
TU L, TU R
TU L
TU R
A
B
S704
(TAPE POWER)
(ON at FF/REW/PLAY modes.)
S703
(FUNCTION)
(SPEAKER)
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
TUNER MUTING
MUTING
MUTING
MUTING
MUTING
(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)
+
–
8
+
–
4
3
2
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
Q252
START/STOP
CONTROL SWITCH
REC
BIAS OSC
Q553
PRE MUTE
SWITCH
Q704
B+ ON/OFF
Q402
SWITCH
Q710
BYPASS
AVLS
SWITCH
Q302
NF
DET
CONTROL
L.B-SW
32
LOW
BOOST
J501
(PLUG IN POWER)
MIC
FLAT MIC
RV301
VOL
EQ
EQ
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
OFF
ON
OFF
ON
SUPER BASS
S303
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
CAPSTAN/REEL
MOTOR DRIVE
IC301 (2/2)
M601
(CAPSTAN/REEL)
MOTOR
DRIVE
CIRCUIT
SWITCH &
LOGIC
CIRCUIT
BIAS
REFERENCE
VOLTAGE
OSC
CIRCUIT
TH601
TAPE SPEED
RV601
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
AM
AM
FM
FM
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
D35
D302
D301
D32
D234
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
MAIN VCC
SHUT DOWN
H/P MUTE
SWITCH
Q705
H/P MUTE
+
+
BATT
MUTING
CONTROL
Q717,718
MUTING
CONTROL
Q31, 709
MUTING
CONTROL
Q719
MUTING
CONTROL
Q720
MUTING
CONTROL
Q722
MUTING
Q714
MUTING
Q706
TUNER Section
(Page 11)
TUNER Section
(Page 11)
TUNER Section
(Page 11)
TUNER Section
(Page 11)
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