Sony CFD-S300L Service Manual ▷ View online
13
CFD-S300L
3-13. MOTOR ASSY (M801), MAIN BELT (B), SUB BELT (B)
6
main belt (B)
7
sub belt (B)
9
motor assy (M801)
0
motor bracket
8
two screws
(
pan M2.6 x 4.5
)
1
screw
(+BVTT 2
x 4)
3
screw
(
bind DT M2 x 6
)
4
screw
(
bind DT M2 x 6
)
2
protect chassis
5
14
CFD-S300L
i
jack (J321)
set
32
Ω
test tape
WS-48A
(3 kHz, 0 dB)
WS-48A
(3 kHz, 0 dB)
digital frequency
counter
counter
TAPE SECTION 0 dB = 0.775 V
• Standard Output Level
Output terminal
HP OUT
load impedance
32
Ω
output signal level
0.25 V (–10 dB)
• Test Tape
Type
Signal
Used for
WS-48A
3 kHz, 0 dB
tape speed adjustment
Tape Speed Adjustment
Procedure:
Mode: playback
Procedure:
Mode: playback
PRECAUTION
1. Clean the following parts with a denatured-alcohol-moistened
swab :
record/playback head
pinch roller
erase head
rubber belts
capstan
idlers
2. Demagnetize the record/playback head with a head demagne-
tizer. (Do not bring the head magnetizer close to the erase head.)
3. Do not use a magnetized screwdriver for the adjustments.
4. The adjustments should be performed with the rated power
4. The adjustments should be performed with the rated power
supply voltage (9V) unless otherwise noted.
Torque Measurement
Mode
Torque meter
Meter reading
2.95 – 6.86 mN • m
FWD
CQ-102C
(30 – 70 g • cm)
(0.42 – 0.97 oz • inch)
FWD
0.15 – 0.53 mN • m
Back Tension
CQ-102C
(1.5 – 5.5 g • cm)
(0.021 – 0.076 oz • inch)
more than 5.88 mN • m
FF
CQ-201B
(more than 60 g • cm)
(more than 0.83 oz • inch)
more than 5.88 mN • m
REW
CQ-201B
(more than 60 g • cm)
(more than 0.83 oz • inch)
Tape Tension Measurement
Mode
Tension meter
Meter Reading
FWD
CQ-403A
more than 100 g
(more than 3.53 oz)
SECTION 5
ELECTRICAL ADJUSTMENTS
SECTION 4
MECHANICAL ADJUSTMENTS
Adjust so that the value on the digital frequency counter is
3,000 Hz.
3,000 Hz.
Specification Value:
Digital frequency counter
2,910 to 3,090 Hz
Adjust so that the frequency at the beginning and that at the end of
tape winding are between 2,910 to 3,090 Hz.
tape winding are between 2,910 to 3,090 Hz.
Adjustment Location:
Tape speed adjustment
control inside motor
control inside motor
15
CFD-S300L
digital
voltmeter
voltmeter
100 k
Ω
TP (VT)
i
jack (J321)
set
32
Ω
level meter
(range: 0.5–5 V ac)
(range: 0.5–5 V ac)
Put the lead-wire
antenna close to
the set.
antenna close to
the set.
AM RF signal
generator
generator
TP (FM IN)
FM RF signal
generator
generator
0.01
µ
F
set
TUNER SECTION 0 dB = 1 µV
• AM Section
Setting:
RADIO BAND•AUTO PRESET button: MW or LW
RADIO BAND•AUTO PRESET button: MW or LW
30% amplitude
modulation by
400 Hz signal
modulation by
400 Hz signal
• FM Section
Setting:
RADIO BAND•AUTO PRESET button: FM
RADIO BAND•AUTO PRESET button: FM
75 kHz frequency
deviation by 1 kHz signal
output level : as low as possible
deviation by 1 kHz signal
output level : as low as possible
• Connecting Level Meter (FM, MW and LW)
• Connecting Digital Voltmeter (FM, MW and LW)
• 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.
MW IF ADJUSTMENT
Adjust for a maximum reading on level meter.
T1
450 kHz
MW FREQUENCY COVERAGE
CHECK
Frequency Display
531 kHz
1,611 kHz
Reading on Digital voltmeter
1.0 ± 0.5 V
5.2 ± 0.6 V
Adjustment Part
<confirmation> <confirmation>
MW TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L3-1
CT3
621 kHz
1,404 kHz
LW FREQUENCY COVERAGE
ADJUSTMENT
Frequency Display
153 kHz
279 kHz
Reading on Digital voltmeter
0.6 ± 0.3 V
5.0 ± 0.1 V
Adjustment Part
<confirmation>
L4
LW TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L3-2
CT5
162 kHz
261 kHz
FM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
T2
10.7 MHz
FM FREQUENCY COVERAGE
ADJUSTMENT
Frequency Display
87.5 MHz
108 MHz
Reading on Digital voltmeter
1.3 ± 0.3 V
3.0 ± 0.2 V
Adjustment Part
<confirmation>
L2
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L1
CT1
87.5 MHz
108 MHz
Adjustment Location: See page 16.
16
CFD-S300L
IC701
Q701
C729
C730
R730
R728
R729
C704
R708
C728
R724
R725
R726
R707
C701
C720
C711
C709
FB701
C736
C734
R709
C705
R710
R701
C703
C731
R706
R727
R712
R723
C708
C751
JC703
C743
C744
C742
C707
C739
C738
R732
R735
R704
R733
R702
R734
R703
R705
R736
R738
R711
R713
R737
C719
C722
C717
C745
C732
CNP701
JW706
JW707
JW709
JW713
JW714
JW722
JW723
JW724
JW725
JW726
C750
C746
C747
C733
C706
JW712
JW710
JW708
C702
TP
(RF)
TP
(VREF)
TP
(TE)
– CD board (conductor side) –
Adjustment Location:
CD SECTION
CD section adjustments are done automatically in this set.
In case of operation check, confirm that focus bias.
In case of operation check, confirm that focus bias.
FOCUS BIAS CHECK
1. Connect the oscilloscope between IC701 pin 4 and pin qa (or
TP (RF) and TP (VREF)).
2. Insert the disc (YEDS-18). (Part No. : 3-702-101-01)
3. Press the N X (CD) button.
4. Confirm that the oscilloscope waveform is as shown in the
3. Press the N X (CD) button.
4. Confirm that the oscilloscope waveform is as shown in the
figure below. (eye pattern)
A good eye pattern means that the diamond shape ( ) in the
center of the waveform can be clearly distinguished.
A good eye pattern means that the diamond shape ( ) in the
center of the waveform can be clearly distinguished.
• RF signal reference waveform (eye pattern)
Test Point:
RF level :
0.85 ± 0.2 Vp-p
0.85 ± 0.2 Vp-p
VOLT/DIV : 50 mV (10 : 1 probe in use)
TIME/DIV : 500 nS
TIME/DIV : 500 nS
When observing the eye pattern, set the oscilloscope for AC range
and raise vertical sensitivity.
and raise vertical sensitivity.
L4
TP (FM IN)
(CONDUCTOR SIDE)
CT1
IC1
IC2
CT3
CT5
L1
L2
T2
T1
L3-2
L3-1
– MAIN board (component side) –
L4
LW
FREQUENCY
COVERAGE
ADJUSTMENT
L2
FM
FREQUENCY
COVERAGE
ADJUSTMENT
CT5, L3-2
LW
TRACKING
ADJUSTMENT
CT3, L3-1
MW
TRACKING
ADJUSTMENT
CT1, L1
FM
TRACKING
ADJUSTMENT
T1
MW
IF
ADJUSTMENT
T2
FM
IF
ADJUSTMENT
TP (VT)
(CONDUCTOR SIDE)
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