Sony CFS-B5L MK2 Service Manual ▷ View online
– 9 –
4-2. TUNER SECTION 0 dB = 1 µV
• FM Section
Setting:
BAND switch: FM
BAND switch: FM
22.5 kHz frequency
deviation by 400 Hz signal
output level : as low as possible
deviation by 400 Hz signal
output level : as low as possible
• MW/LW Section
Setting:
BAND switch: MW or LW
BAND switch: MW or LW
30% amplitude
modulation by 400 Hz signal
output level : as low as possible
modulation by 400 Hz signal
output level : as low as possible
• SW Section
Setting:
BAND switch: SW
FINE TUNE control: mechanical mid
BAND switch: SW
FINE TUNE control: mechanical mid
FM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L2
CT2
64 MHz
109.5 MHz
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L1
CT1
64 MHz
109.5 MHz
FM IF ADJUSTMENT
T1
10.7 MHz
MW TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L3-1
CT3
620 kHz
1,400 kHz
MW FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L8
CT4
520 kHz
1,680 kHz
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
T2
455 kHz
LW FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L4
CT8
145 kHz
300 kHz
LW TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L3-2
CT7
160 kHz
260 kHz
SW FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L6
CT6
5.8 MHz
18.4 MHz
SW TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L5
CT5
5.9 MHz
18.2 MHz
Adjustment Location: See page 10.
FM RF signal
generator
generator
telescopic antenna
input
input
set
0.01
µ
F
Put the lead-wire
antenna close to
the set.
antenna close to
the set.
AM RF signal
generator
generator
30% amplitude
modulation by 400 Hz signal
output level : as low as possible
modulation by 400 Hz signal
output level : as low as possible
AM RF signal
generator
generator
telescopic antenna
input
input
set
11 PF
• Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.
done by the trimmer capacitors.
• Remove telescopic antenna in FM section adjustments.
2
jack (J301)
set
32
Ω
level meter
(range: 0.5 – 5 V ac)
(range: 0.5 – 5 V ac)
– 10 –
FM VCO Adjustment
Setting:
Procedure:
1. Adjust RV1 so that the reading on the frequency counter becomes
1. Adjust RV1 so that the reading on the frequency counter becomes
in 76.0 kHz ± 50 Hz.
Adjustment Location: tuner board
Modulation: no modulation
Output level: 0.1 V (100 dB)
Output level: 0.1 V (100 dB)
FM RF SSG
telescopic antenna
input
input
0.001
µ
F
Adjustment Location:
–tuner board (component side)–
FM VCO
Adjustment
RV1
FM
FREQUENCY
COVERAGE
Adjustment
MW
FREQUENCY
COVERAGE
Adjustment
LW
FREQUENCY
COVERAGE
Adjustment
SW
FREQUENCY
COVERAGE
Adjustment
SW
TRACKING
Adjustment
LW
TRACKING
Adjustment
MW
TRACKING
Adjustment
FM
TRACKING
Adjustment
T2
AM IF
Adjustment
FM IF
Adjustment
T1
L2 CT2
CT4 L8
CT6
L6
CT8
L4
CT5
L5
L3-2
CT7
L3-1
CT1
L1
CT3
TELESCOPIC
ANTENNA INPUT
ANTENNA INPUT
IC1
7
FM VCO Adjustment
frequency counter
frequency counter
0.01
µ
F
33 k
Ω
1
15
–tuner board (conductor side)–
– 11 –
– 12 –
SECTION 5
DIAGRAMS
5-1. BLOCK DIAGRAM
7
2
11
15
17
+
+
1
8
16
13 5
18
LINE
LINE
SW
V REG
TU
TU
BIAS OSC
Q340
FINE TUNE
CONTROL
Q2
BIAS OSC
Q341
BPF
FL1
MUTE
Q151
MUTE
DRIVE
Q351
T301
BIAS OSC
T2
CT1
CT2
CV2
CV1
L2
FM OSC
L-CH
HRP101
REC/PB
HEAD
HE101
ERASE
HEAD
R-CH
R-CH
FM OSC
FM MIX
AM MIX
AM OSC
FM
IN
IN
AM IN
FM RF
FM OSC
FM
DESCRI
REG
OUT
OUT
VCO
AM OSC
ANT1
FM/SW
TELESCOPIC
ANTENNA
22
26
21
27
MPX
REG
FE
OUT
FM
IF IN
IF IN
AM
IF IN
IF IN
28
20
18
19
24
M
CF1
16
13
14
15
5
7
6
FM
DET
AM
DET
BUFFER
REG
FM
MPX
MUTE
BAND
SELECT
SELECT
VCC
FM/SW/MW/LW
FRONT-END, IF DET,
FM STEREO
DEMODULATOR
IC1
R-CH
R-CH
R-CH
RV1
FM VCO
PRE AMP
IC301
REG
Q951
+9V
CF2
AM IF
Q1
10
1
POWER AMP
IC305
J901
AC IN
T901
POWER
TRANSFORMER
SP901
SPEAKER
L-CH
SP902
SPEAKER
R-CH
04
• Signal path
• R-ch : same as L-ch.
:
FM/SW
:
MW/LW
:
PB
:
REC
CV1, 2
TUNE
CV4
TUNE
CV3
TUNE
RV2
FINE TUNE
T1
FM IF
CT2,L2
FM
FREQUENCY
COVERAGE
CT1,L1
FM
TRACKING
CT5, L5
SW
TRACKING
CT3, L3-1
MW
TRACKING
T2
AM IF
R-CH
+9V
D901
D901-904
RECT
D902
D903
D904
DRY BATTERY
SIZE "D"
(IEC DESIGNATION R20)
6PCS, 9V
MIC301
MIC
S303
ISS
1
2
S301-3
(REC/PB)
PB REC
S301-1
(REC/PB)
PB REC
S301-4
(REC/PB)
PB REC
R-CH
R-CH
PB IN
PB IN
REC
REC
MIC
MEGA BASS
RV353-1
(L-CH)
HYPER
TREBLE
RV352-1
(L-CH)
VOLUME
RV351-1
(L-CH)
S302-2
FUNCTION
TAPE
(RADIO OFF)
RADIO
S302-1
FUNCTION
TAPE
(RADIO OFF)
RADIO
D911
OPR/BATT
+9V
+9V
S902
(POWER)
M901
MOTOR
S1-6
BAND
LW
MW
SW
FM
S1-3
BAND
LW
MW
SW
FM
S1-8
BAND
LW
MW
SW
FM
S1-7
BAND
FM
SW
MW
LW
S1-5
BAND
FM
SW
MW
LW
S1-1
BAND
LW
MW
SW
FM
S1
BAND
S1-2
LW
MW
SW
FM
S1-4
LW
MW
SW
FM
+4V
D3
CT8
L4
LW OSC
CT7
CT5
L3-2
LW
L5
SW ANT
CT3
L3-1
MW
CT6
L6
SW OSC
CT4
L8
MW OSC
CT6, L6
SW
FREQUENCY
COVERAGE
L3
MW/LW
FERRITE-ROD
ANTENNA
L1
FM RF
J301
2
CT4, L8
MW
FREQUENCY
COVERAGE
CT8, L4
LW
FREQUENCY
COVERAGE
CT7, L3-2
LW
TRACKING
CFS-B5LMK2
CFS-B5LMK2
– 13 –
– 14 –
5-2. CIRCUIT BOARDS LOCATION
SECOND board
ISS board
MICROPHONE board
SUPPORT board
TUNER board
AC board
BATTERY board
AUDIO board
• IC Block Diagram
IC1 CXA1538S
30 29
4
3
2
1
28 27
26 25 24 23 22 21
20
19 18
17
16
VCO
MPX REG.
REG
FM FRONT-END
AM FRONT-END
1/2
COUNTER
1/2
COUNTER
5
6
7
8
9
10 11
12
13 14 15
MONO/ST
SELECT
DECORD AMP
RIPPLE
FILTER
MUTING
PD 1
PD 2
AUTOBLEND
BAND PASS
MUTE
TUNING
INDICATOR
AM
IF/DET
FM IF/
DISCRI
GND
PLL LPF2
MPX REG
VCO
MUTE
AM OSC
AFC
FM OSC
REG OUT
FM RF
AM RF IN
FM RF IN
FE GND
FM/AM
FE OUT
FM
DISCRI
BAND SELECT
AM IF IN
FM IF IN
TUNED IND
GND
AFC/AGC 2
AFC/AGC 1
VCC
LCH OUT
RCH OUT
PLL LPF 1
PILOT DET
LPF 1
PILOT DET
LPF 2
ST IND/
VCC CHECK
RIPPLE
FILTER
5-3. PRINTED WIRING BOARD — TUNER SECTION —
Note:
• X
: parts extracted from the component side.
• b
: Pattern from the side which enables seeing.
D1
B-5
D2
B-5
D3
B-2
IC1
C-3
Q1
B-2
Q2
D-4
• Semiconductor
Location
Ref. No.
Location
(Page 17)
Click on the first or last page to see other CFS-B5L MK2 service manuals if exist.