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Model
CFS-1085S
Pages
30
Size
1.51 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
cfs-1085s.pdf
Date

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
30% amplitude modulation by
 400Hz signal.
Output level : as low as possible
telescopic
antenna
terminal
12PF
Adjustment Location : Mechanism deck
Switch location
   FUNCTION switch................ TAPE (RADIO OFF)
   SOUND SELECT.................. FLAT
   VOLUME.............................. mechanical center
   MEGA BASS......................... OFF
TUNER SECTION
AM  RF signal
generator
30% amplitude modulation by 400Hz
signal.
Output level : as low as possible
Put the lead-wire
antenna close to 
the set.
set
32
J301 (phones)
level meter
FM RF signal
generator
22.5kHz frequency deviation by 
1kHz signal.
Output level : as low as possible
telescopic
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.
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 
±
 500Hz reading on frequency
counter.
Adjustment Location :
telescopic
antenna
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)
A
CN304
1
6
1
4
7
15
16
30
CF3
frequency
counter
1
µ
F
+
33k
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 
µ
F unless otherwise noted.  pF: 
µµ
F
50 WV or less are not indicated except for electrolytics
and tantalums.
• All resistors are in 
 and 
1
/
4
 
W or less unless otherwise
specified.
Note:
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
• Voltages are taken with a VOM (Input impedance 10 M
).
Voltage variations may be noted due to normal produc-
tion tolerances.
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal produc-
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
µ
sec
VOLT/DIV : 2V AC
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
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
Q340
B+
RADIO B+
RADIO B+
MIC
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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