Sony CFS-1085SMK2 Service Manual ▷ View online
9
CFS-1085SMK2
Tape Speed Adjustment
Procedure :
Mode : playback
Mode : playback
Adjustment Values :
Digital frequencycounter
2,910 to 3,090Hz
Frequency difference between the begining and the end of the
tape should be within 1% (30Hz)
tape should be within 1% (30Hz)
Adjustment Values :
tape speed adjustment
control inside motor
control inside motor
set
test tape
WS-48B
(3kHz, 0dB)
WS-48B
(3kHz, 0dB)
32
Ω
digital frequency
counter
phones jack
10
CFS-1085SMK2
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)
Adjustment Location : Tuner board (See page 11)
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
• 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
0dB = 1
µ
V
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.
finally done by the trimmer capacitors.
11
CFS-1085SMK2
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-1085SMK2
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
DC IN 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.
• All resistors are in
Ω
and
1
/
4
W or less unless otherwise specified.
•
A
: B+ Line.
•
H
: adjustment for repair.
• Power voltage is dc 9 V and fed with regulated dc power supply
from battery terminal.
• Voltages and waveforms are dc with respect to ground under no-
signal (detuned) conditions.
no mark : FM (RADIO SECTION), PLAY (TAPE SECTION)
(
no mark : FM (RADIO SECTION), PLAY (TAPE SECTION)
(
) : MW (RADIO SECTION), REC (TAPE SECTION)
<
> : SW1,2
• 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.
Note: The components identified by mark
!
or dotted line
with mark
!
are critical for safety.
Replace only with part number specified.
• Signal path.
F
: FM
f
: AM
E
: PB
a
: REC
J
: CD/TV LINE IN
• WAVEFORMS
T301
VOL/DIV : 5 V AC
TIME/DIV : 5
TIME/DIV : 5
µ
sec
2
Q301
B
VOL/DIV : 2 V AC
TIME/DIV : 5
TIME/DIV : 5
µ
sec
1
25Vp-p
18.3
µ
sec
5.5Vp-p
18.3
µ
sec
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