Sony CFD-151 Service Manual ▷ View online
– 13 –
4-1. TAPE RECORDER SECTION
• 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
P-4-A063
6.3 kHz, –10 dB
head azimuth adjustment
SECTION 3
MECHANICAL ADJUSTMENTS
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 demagnetizer.
(Do not bring the head magnetizer close to the erase head.)
3. Do not use a magnetized screwdriver for the adjustments.
4. After the adjustments, apply suitable locking compound to the parts
adjusted.
5. The adjustments should be performed with the rated power supply
voltage unless otherwise noted.
(Do not bring the head magnetizer close to the erase head.)
3. Do not use a magnetized screwdriver for the adjustments.
4. After the adjustments, apply suitable locking compound to the parts
adjusted.
5. The adjustments should be performed with the rated power supply
voltage unless otherwise noted.
Torque Measurement
Mode
Torque Meter
Meter Reading
30–70 g • cm
FWD
CQ-102C
(0.42–0.97 oz • inch)
FWD
CQ-102C
1.5–5.5 g • cm
Back Tension
(0.021–0.076 oz • inch)
more than 60 g • cm
FF
CQ-201B
(more than 0.83 oz • inch)
more than 60 g • cm
REW
CQ-201B
(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 4
ELECTRICAL ADJUSTMENTS
Tape Speed Adjustment
Procedure :
Mode: playback
Mode: playback
Adjustment Value :
Speed checker
Digital frequency counter
– 0.5 to + 0.5 %
2,985 to 3,015 Hz
speed checker
LFM-30
or
digital frequency
counter
LFM-30
or
digital frequency
counter
set
phones jack
32
Ω
test tape
WS-48A
(3 kHz, 0 dB)
WS-48A
(3 kHz, 0 dB)
Frequency difference between the beginning and the end of the tape
should be within ± 1.5 % (45 Hz).
should be within ± 1.5 % (45 Hz).
Adjustment Location:
TAPE
SPEED
ADJ
0 dB = 0.775 V
– 14 –
REC/PB Head Azimuth Adjustment
Procedure :
1. Mode : playback
1. Mode : playback
test tape
P-4-A063
(6.3 kHz, –10 dB)
P-4-A063
(6.3 kHz, –10 dB)
phones jack
2. Turn the adjustment screw for the maximum output levels. If these
levels do not match. Turn the adjustment screw until both of output
levels match together within 3 dB.
levels match together within 3 dB.
angle
within
3 dB
3 dB
L-CH
peak
peak
R-CH
peak
peak
within
3 dB
3 dB
Output
level
level
R-CH
peak
peak
screw
position
position
L-CH
peak
peak
3. Phase Check
Mode : playback
test tape
P-4-A063
(6.3 kHz, –10 dB)
P-4-A063
(6.3 kHz, –10 dB)
L-CH
set
R-CH
L-CH
32
32
Ω
oscilloscope
V
H
Screen pattern
in phase
45°
90°
180°
135°
good
wrong
Note :
Finish the screw adjustment with a turn in the clockwise
direction.
After the adjustment, lock the adjustment screw.
direction.
After the adjustment, lock the adjustment screw.
Adjustment Location : record/playback head
adjustment
screw
screw
set
32
Ω
phones jack
32
Ω
R-CH
level meter
– 15 –
FM FREQUENCY COVERAGE
ADJUSTMENT
Adjust for a maximum reading on level meter.
L2
CT2
86.5 MHz (87.0 MHz)
109.5 MHz (108.3 MHz)
<87.35 MHz> ((64.0 MHz))
<108.25 MHz> ((109.5 MHz))
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L1
CT1
86.5 MHz (87.0 MHz)
109.5 MHz (108.3 MHz)
<87.35 MHz> ((68.0 MHz))
<108.25 MHz> ((102.0 MHz))
AM FREQUENCY COVERAGE
ADJUSTMENT
Adjust for a maximum reading on level meter.
L4
CT4
520 kHz <516 kHz>
1,780 kHz <1,630 kHz>
<<1,680 kHz>>
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L3
CT3
620 kHz
1,400 kHz
( ) : AEP, UK, German model
< > : Italian model
(( )) : East European model
<< >> : AEP, UK, E, German, East European model
Adjustment Location : See page 16.
telescopic antenna
input terminal
input terminal
set
0.01
µ
F
FM RF signal
generator
generator
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
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
Put the lead-wire
antenna close to
the set.
antenna close to
the set.
set
phones jack
32
Ω
4-2. TUNER SECTION
• FM Section
Setting :
FUNCTION switch : FM
FUNCTION switch : FM
• AM Section
Setting :
FUNCTION switch : AM
FUNCTION switch : AM
• Connecting Level Meter (FM and AM)
• Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally done
by the trimmer capacitors.
by the trimmer capacitors.
0 dB = 1 µV
level meter
(range: 0.5-5 V ac)
(range: 0.5-5 V ac)
– 16 –
Adjustment Location : tuner board (component side)
telescopic antenna
input terminal
input terminal
set
0.01
µ
F
FM VCO Adjustment
Setting :
FUNCTION switch : FM
FUNCTION switch : FM
Carrier frequency : 98.0 MHz (Except East European model)
86.0 MHz (East European model)
Output level
: 100 dB (0.1 V)
Mode
: mono
Modulation
: 400 Hz
FM
TRACKING
ADJ
L1 CT1
FM
FREQUENCY
COVERAGE
ADJ
L2 CT2
RV1
FM VCO
ADJ
IC1
1
15
30
16
CT4 L4
AM
FREQUENCY
COVERAGE
ADJ
L3 CT3
AM
TRACKING
ADJ
FM RF signal
generator
generator
frequency
counter
tuner
board
1 µF/50 V
Procedure :
1. Connect frequency counter between IC1 pin 7 and pin 4.
2. Tune the set to 98.0 MHz (except East European model) or 86.0 MHz
1. Connect frequency counter between IC1 pin 7 and pin 4.
2. Tune the set to 98.0 MHz (except East European model) or 86.0 MHz
(East European model).
3. Adjust RV1 for 76.0 kHz ±500 Hz reading on the frequency counter.
IC1 pin
7
IC1 pin
4
33 k
Ω
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