Sony HS-JM400 Service Manual ▷ View online
9
HS-JM400
[AM]
BAND : AM
BAND : AM
[FM]
BAND : FM
BAND : FM
AM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L4
505 kHz
CT1-4
1,690 kHz
TUNER SECTION
0.01
µ
F
FM RF signal
generator
generator
to ANT (FM IN)
75kHz frequency deviation by 1kHz signal.
Output level : as low as possible
Output level : as low as possible
Put the lead-wire
antenna close to
the set.
antenna close to
the set.
30% amplitude modulation by 400 Hz
signal.
Output level : as low as possible
signal.
Output level : as low as possible
AM RF signal
generator
generator
set
+
–
level meter
2
jack (J301)
16
Ω
0dB=1µV
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
T1
455 kHz
FM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L3
86.0 MHz
CT1-3
109.5 MHz
• Repeat the procedures in each adjustment several times.
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L1
620 kHz
CT1-1
1,400 kHz
[MAIN BOARD] - SIDE B -
Adjustment Parts Location :
[MAIN BOARD] - SIDE A -
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L2
86.0 MHz
CT1-2
109.5 MHz
CT1-3
CT1-4
CT1-2
CT1-1
RV601
L4
L3
L2
T1
L1
CT1-3 : FM frequency
coverage adjustment
CT1-4 : AM frequency
coverage adjustment
CT1-2 : FM tracking
adjustment
CT1-1 : AM tracking
adjustment
RV601 : Tape speed adjustment
L4 : AM frequency
coverage adjustment
L3 : FM frequency
coverage adjustment
L1 : AM tracking
adjustment
L2 : FM tracking
adjustment
T1 : AM IF
adjustment
10
HS-JM400
SECTION 6
DIAGRAMS
• WAVEFORMS
Note on Schematic Diagram:
• All capacitors are in
• All capacitors are in
µ
F unless otherwise noted. p: pF.
50 WV or less are not indicated except for electrolytics and
tantalums.
tantalums.
• All resistors are in
Ω
and
1
/
4
W or less unless otherwise specified.
•
f
: internal component.
•
C
: panel designation.
•
A
: B+ Line.
•
H
: adjustment for repair.
• Total current is measured with no cassette installed.
• Power voltage is dc 3 V and fed with regulated dc power supply
• Power voltage is dc 3 V and fed with regulated dc power supply
from external power voltage jack (J401).
• Voltages and waveforms are dc with respect to ground under no-
signal (detuned) conditions.
no mark : FM
(
no mark : FM
(
) : PB
• Voltages are taken with a VOM (Input impedance 10 M
Ω
).
Voltage variations may be noted due to normal production toler-
ances.
ances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal production toler-
ances.
ances.
• Circled numbers refer to waveforms.
• Signal path.
F
: FM
f
: AM
E
: PB
d
: REC
N
: MIC INPUT
• Abbreviation
CH
: Chinese model
9E
: No indication of country of origin
Note on Printed Wiring Board:
•
f
: internal component.
• Y
: parts extracted from the conductor side.
•
a
: Through hole.
Caution:
Pattern face side:
Pattern face side:
Parts on the pattern face side seen from
(Side B)
the pattern face are indicated.
Parts face side:
Parts on the parts face side seen from
(Side A)
the parts face are indicated.
10 V/DIV, 10
µ
s
/DIV
1 V/DIV,
2 ms
/DIV
1
T551 (REC mode)
37 Vp-p
22
µ
s
2.5 Vp-p
4.5 ms
2
IC301
r;
(VOUT)
(
PB mode
)
Ver 1.1
11
11
HS-JM400
6-1. BLOCK DIAGRAM – TUNER SECTION –
1
4
8
24
21
23
FM
RF AMP
FM/AM
MIX AMP
FM/AM
OSC
FM
IF AMP
DECODER
AMP
SWITCH
DIVIDER/
VCO
FM
DET
LEVEL
DET
AM
DET
FM
MUTE
AF
BUFFER
AM
IF AMP
PD1
PD2
AM
RF AMP
7
FM-RF
IN
IN
MIX
CF2
10.7MHz
X2
10.7MHz
CF1
455kHz
12
FM
IF IN
IF IN
14
13
L OUT
R OUT
15
16
10
AM
IF IN
IF IN
LP2
BAND
LP1
MO-ST
TUN LED
FM OSC
20
AM OSC
L1
AM
FERRITE BAR
ANTENNA
FM-RF OUT
AM-RF
IN
IN
L2
FM RF
FM/AM RF AMP, FM/AM MIX AMP,
FM/AM OSC, FM/AM IF AMP, DET, MPX
IC1
CT1-2
CV1-2
CV1
TUNING
CT1-1
CV1-1
L3
FM OSC
CT1-3
CV1-3
L4
AM OSC
CT1-4
CV1-4
CT1-3, L3
FM FREQUENCY
COVERAGE
CT1-4, L4
AM FREQUENCY
COVERAGE
CT1-1, L1
AM TRACKING
CT1-2, L2
FM TRACKING
T1
AM IF
B.P.F.
CP1
ANT
ANT1
FM
TELESCOPIC
ANTENNA
C
D
B
TU L, TU R
A
11
ST LED
AGC
TUN
LED
ST
LED
DET-OUT
AF
AMP
MPX-IN
QUAD
18
17
D33
AM
FM
TUNER MUTING
C2
TU VCC
S1
FM ST
MONO
R5
JR3
Q33, 34
BAND SELECT
SWITCH
Q30, 32
MUTING
CONTROL
MAIN Section
(Page 12)
MAIN Section
(Page 12)
MAIN Section
(Page 12)
MAIN Section
(Page 12)
• SIGNAL PATH
: FM
: AM
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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