Sony CFS-1085S Service Manual ▷ View online
10
CFS-1085S
TUNER SECTION
MW Section
Procedure :
BAND Switch
: MIN
FINE TUNE control
: mechanical center
SW Section
Procedure :
BAND Switch
: SW1, SW2
FINE TUNE control
: mechanical center
FM Section
Procedure :
BAND Switch
: FM
FINE TUNE control
: mechanical center
(
) : Saudi Arabia model
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
T1
455kHz
MW FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L4
520kHz
CT4
1,680kHz
MW TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L3
620kHz
CT3
1,400kHz
SW1 FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L6
2.2MHz
CT6
7.3MHz
SW1 TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L5
2.2MHz
Confirmation
7.3MHz
SW2 FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L8
6.8MHz
CT8
22.5MHz
SW2 TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L7
6.8MHz
Confirmation
22.5MHz
FM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L2
86.5MHz (87.35MHz)
CT2
109.5MHz (107.8MHz)
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L1
86.5MHz (87.35MHz)
CT1
109.5MHz (107.8MHz)
AM RF signal
generator
generator
30% amplitude modulation by
400Hz signal.
Output level : as low as possible
400Hz signal.
Output level : as low as possible
telescopic
antenna
terminal
antenna
terminal
12PF
Adjustment Location : Mechanism deck
z
Switch location
FUNCTION switch................ TAPE (RADIO OFF)
SOUND SELECT.................. FLAT
VOLUME.............................. mechanical center
MEGA BASS......................... OFF
SOUND SELECT.................. FLAT
VOLUME.............................. mechanical center
MEGA BASS......................... OFF
TUNER SECTION
AM RF signal
generator
generator
30% amplitude modulation by 400Hz
signal.
Output level : as low as possible
signal.
Output level : as low as possible
Put the lead-wire
antenna close to
the set.
antenna close to
the set.
set
32
Ω
J301 (phones)
level meter
FM RF signal
generator
generator
22.5kHz frequency deviation by
1kHz signal.
Output level : as low as possible
1kHz signal.
Output level : as low as possible
telescopic
antenna
terminal
antenna
terminal
0.01
µ
F
• 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.
11
CFS-1085S
FM VCO Adjustment
Procedure :
1. Connect the frequency counter to 4 and 7 pins of IC1 as
shown the figure.
2. Turn the set to 98MHz.
3. Adjustment RV1 for 76kHz
3. Adjustment RV1 for 76kHz
±
500Hz reading on frequency
counter.
Adjustment Location :
telescopic
antenna
terminal
terminal
FM RF signal
generator
Carrier frequency : 98MHz
Modulation : no modulation
Output level : 0.032V (90dB)
0.01
µ
F
set
C14
C15
C000
C000
C18
C20
C19
C5
R7
R8
R24
R11
R9
R16
R6
R4
R5
C4
C16
C17
C31
CF1
C9
C13
VR1
FINE
L2
B
C
E
Q2
IC1
TUNER BOARD
(Conductor side)
(Conductor side)
A
CN304
1
6
1
4
7
15
16
30
CF3
frequency
counter
1
µ
F
+
33k
33k
Ω
CT2 : FM Frequency Coverage Adjustment
L2 : FM Frequency Coverage Adjustment
CT4 : MW Frequency Coverage Adjustment
T1 : AM IF Adjustment
L3 : MW Tracking Adjustment
CT3 : MW Tracking Adjustment
CT1 : FM Tracking Adjustment
L1 : FM Tracking Adjustment
L4 : MW Frequency Coverage Adjustment
L8 : SW2 Frequency Coverage Adjustment
CT8 : SW2 Frequency Coverage Adjustment
CT6 : SW1 Frequency Coverage Adjustment
L6 : SW1 Frequency Coverage Adjustment
RV1: FM VCO Adjustment
L7 : SW2 Tracking Adjustment
L5 : SW1 Tracking Adjustment
(Component side)
TUNER BOARD
12
CFS-1085S
SECTION 4
DIAGRAMS
4-1. CIRCUIT BOARDS LOCATION
POWER BOARD
LED BOARD
TUNER BOARD
GE SW BOARD
VOL BOARD
MEGA BASS SW BOARD
MIC BOARD
MAIN BOARD
Note:
• All capacitors are in
• All capacitors are in
µ
F unless otherwise noted. pF:
µµ
F
50 WV or less are not indicated except for electrolytics
and tantalums.
and tantalums.
• All resistors are in
Ω
and
1
/
4
W or less unless otherwise
specified.
Note:
The components identified by mark
The components identified by mark
!
or dotted
line with mark
!
are critical for safety.
Replace only with part number specified.
•
A
: B+ Line.
•
H
: adjustment for repair.
• Power voltage is dc 9V and fed with regulated dc power
supply frombattery terminal .
• Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
no mark
: FM (RADIO SECTION), PLAY (TAPE SEC-
TION)
( ) : MW (RADIO SECTION), REC (TAPE SEC-
TION)
< > : SW1,2
( ) : MW (RADIO SECTION), REC (TAPE SEC-
TION)
< > : SW1,2
• Voltages are taken with a VOM (Input impedance 10 M
Ω
).
Voltage variations may be noted due to normal produc-
tion tolerances.
tion tolerances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal produc-
tion tolerances.
tion tolerances.
• Circled numbers refer to waveforms.
WAVEFORMS
1
2
T301
Q301
B
250Vp-p
18.3
µ
sec
5.5Vp-p
18.3
µ
sec
VOLT/DIV : 50V AC
TIME/DSIV : 5
TIME/DSIV : 5
µ
sec
VOLT/DIV : 2V AC
TIME/DSIV : 5
TIME/DSIV : 5
µ
sec
• Signal path.
F
: FM
f
: AM
E
: PB
a
: REC
J
: CD/TV LINE IN
• Abbreviation
EA:Saudi Arabia
CFS-1085S
13
13
4-2. BLOCK DIAGRAMS
B+
B+
CF3
B+
ANT1
FM/SW
TELESCOPIC
ANTENNA
S1-8
S1-5
S1-7
S1-6
S1-6
S1-3
S1-2
SW1
TRACKING
SW2
TRACKING
MW
TRACKING
L3,CT3
CT3
CT2
CV1(3/4)
CV1(2/4)
CT1 CV1(1/4)
L2, CT2
FM
FREQUENCY
COVERAGE
L4, CT4
MW
FREQUENCY
COVERAGE
L8, CT8
SW2
FREQUENCY
COVERAGE
L6, CT6
SW1
FREQUENCY
COVERAGE
L1, CT1
FM
FREQUENCY
COVERAGE
IN
IN
FE
OUT
CF4
CV1(4/4)
CT6
CT8
CT4
D5
S1-4
16
22
22
14
24
13
18
20
1
7
8
9
10
6
8
22
17
8
9
J304
CD/TV
LINE IN
L
R
HE301
ALC
ALC
DET
5
4
23
DET
S302-2
PB
r
REC
S302-1
PB
r
REC
S401
MEGA BASS
OFF
r
ON
BIAS
OSC
Q301
MIC
REC
REC
Q340
B+
RADIO B+
RADIO B+
MIC
I/EX
I/EX
17
RADIO
L.RAD
R.RAD
MIC
R.CD
L.CD
L.IN
L.RO
L.LO
R.LO
R.IN
R.RO
TAPE EQ, REC AMP,
FUNCTION SWITCH
IC301
MEGA BASS
Q102
MEGA BASS
Q202
MEGA BASS
CONTROL
Q310
B+
ANALOG SWITCH
D311
FLAT
D312
GROOVE
D313
LIVE
D314
POPS
D315
CINEMA
RV301
VOLUME
11
10
3
5
12
13
STBY
8
STBY
J302
SPEAKER
J301
PHONES
SP101
SPEAKER
+
–
SP102
SPEAKER
SP201
SPEAKER
+
–
SP202
SPEAKER
LEFT
RIGHT
11
10
3
5
12
13
POWER AMP
IC102
POWER AMP
IC202
GEQ AMP
IC302
Q101
MUTE
Q201
MUTE
S901
VOLTAGE
SELECTOR
220-240V
110-10V
J901
-
AC IN
R
F901
F902
T901
POWER TRANSFORMER
MUTE DRIVE
Q309
MUTE DRIVE
Q307
GEQ CONTROL
Q103, 203, 303
GEQ CONTROL
Q204, 205, 304
B+ ON/OFF
Q305, 306
6V REG
Q302
MOTOR
SWITCH
Q308
M
M601
MOTOR
S601
MD POWER
S301-1
FUNCTION
CD/TV
LINE IN
R
RADIO
r
TAPE/RADIO OFF
S301-1
FUNCTION
CD/TV
LINE IN
R
RADIO
r
TAPE/RADIO OFF
DRY BATTERY
SIZE "D"
(IEC DESIGNATION R20)
6PCS, 9V
RECT
D901-904
S303
SOUND SELECT
D101
D201
CV1(1-4)
TUNING
3
1
5
VOLTAGE DET
IC303
D3
FM STEREO
D302
OPR/BATT
26
• Signal path.
k
: FM
,
: AM
E
: PB
a
: REC
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