Sony CFS-B21L Service Manual ▷ View online
CFS-B21L
— 9 —
SECTION 5
DIAGRAMS
5-1.
CIRCUIT BOARDS LOCATION
MAIN board
BATTERY board
VOLUME board
RETAINER board
TUNER board
POWER board
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30
29
4
5
6
7
8
9
10
11
12
13 14 15
3
2
1
28 27
26 25 24 23 22 21
20
19
18
17
16
REG
FM FRONT-END
AM FRONT-END
VCO
MPX REG.
1/2
COUNTER
1/2
COUNTER
PD1
PD2
MUTING
DECODER AMP
MONO/ST
SELECT
RIPPLE
FILTER
AUTOBLEND
BAND PASS
MUTE
TUNING
INDICATOR
FM IF/
DISCRI
AM
IF/DET
GND
PLL LPF2
MPX REG
VCO
FM
DISCRI
MUTE
AM OSC
AFC
FM OSC
REG
FM RF
AM RF IN
FM RF IN
BAND SELECT
AM IF IN
FM IF IN
TUNE IND
GND
VCC
L CH OUT
R CH OUT
ST IND/
VCO CHECK
PILOT DET LPF2
PILOT DET LPF2
PLL LPF1
AGC AFC2
AGC AFC1
RIPPLE
FIL
TER
FM GND
FM/AM
FE OUT
30
1
2
3
4
5
7
8 9
10
11
12
13
14
15
6
29
28 27 26 25 24 23
22
21
20 19
18 17
16
B+
B+
B+
B+
B+
B+
B+
B+
B+
B+
B+
B+
B+
B+
MIC-IN
AUX-IN
SW
SW
SW
NC
NC
SW
LPF-2
ALC
POP-NOISE-DEL
POWER GND
POWER-OUT
-A
VCC
S VCC
POWER-OUT
-B
POWER GND
RIP-FIL
POWER IN
LIN-OUT
R-VCC
NC
SIG-GND
VBIAS2
VBIAS1
PRE
PRE-IN
HEAD-IN (–)
HEAD-IN (+)
MIC IN (–)
5-2.
IC BLOCK DIAGRAMS
• IC101,201 MM1315BD
• IC1 CXA1238S
CFS-B21L
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— 10 —
Note:
• X
: parts extracted from the component side.
•
W
: indicates side identified with part number.
5-3.
PRINTED WIRING BOARD — MAIN SECTION —
SECTION 5
DIAGRAMS
5-1.
CIRCUIT BOARDS LOCATION
30
29
4
5
6
7
8
9
10
11
12
13 14 15
3
2
1
28 27
26 25 24 23 22 21
20
19
18
17
16
REG
FM FRONT-END
AM FRONT-END
VCO
MPX REG.
1/2
COUNTER
1/2
COUNTER
PD1
PD2
MUTING
DECODER AMP
MONO/ST
SELECT
RIPPLE
FILTER
AUTOBLEND
BAND PASS
MUTE
TUNING
INDICATOR
FM IF/
DISCRI
AM
IF/DET
GND
PLL LPF2
MPX REG
VCO
FM
DISCRI
MUTE
AM OSC
AFC
FM OSC
REG
FM RF
AM RF IN
FM RF IN
BAND SELECT
AM IF IN
FM IF IN
TUNE IND
GND
VCC
L CH OUT
R CH OUT
ST IND/
VCO CHECK
PILOT DET LPF2
PILOT DET LPF2
PLL LPF1
AGC AFC2
AGC AFC1
RIPPLE
FIL
TER
FM GND
FM/AM
FE OUT
30
1
2
3
4
5
7
8 9
10
11
12
13
14
15
6
29
28 27 26 25 24 23
22
21
20 19
18 17
16
B+
B+
B+
B+
B+
B+
B+
B+
B+
B+
B+
B+
B+
B+
MIC-IN
AUX-IN
SW
SW
SW
NC
NC
SW
LPF-2
ALC
POP-NOISE-DEL
POWER GND
POWER-OUT
-A
VCC
S VCC
POWER-OUT
-B
POWER GND
RIP-FIL
POWER IN
LIN-OUT
R-VCC
NC
SIG-GND
VBIAS2
VBIAS1
PRE
PRE-IN
HEAD-IN (–)
HEAD-IN (+)
MIC IN (–)
MAIN board
BATTERY board
VOLUME board
RETAINER board
TUNER board
POWER board
5-2.
IC BLOCK DIAGRAMS
• IC101,201 MM1315BD
• IC1 CXA1238S
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— 12 —
Ref. No.
Location
• Semiconductor Location
Ref. No.
Location
D301
E-13
D304
C-7
D305
C-7
D306
A-13
D307
C-7
D308
C-7
D309
D-11
D901
D-2
D902
D-1
D903
D-3
D904
D-1
IC101
C-11
IC201
C-12
Q101
C-7
Q102
C-8
Q201
C-7
Q202
C-8
Q301
E-12
Q303
D-13
Q304
C-13
Q305
C-13
Q306
B-13
Q307
E-12
Q308
C-7
CFS-B21L
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5-4.
SCHEMATIC DIAGRAM — MAIN SECTION —
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