Sony CFD-E77L Service Manual ▷ View online
13
CFD-E77L
3-13. CONNECTOR SETTING
MAIN board
TUNER board
CNP1
CNP321
CN322
CNP802
CNP801
CN303
TC board
CN321
CNP322
Note: When connecting leads, set it as shown in the figure.
3-12. HEAD (HRP301), MOTOR ASSY (M301), BELT
6
two screws
(B2.6
(B2.6
×
5)
7
motor assy (M301)
8
belt
5
head (HRP301)
1
screw
(BVTT2
(BVTT2
×
6)
3
Remove
four solders.
four solders.
4
TC board
2
14
CFD-E77L
SECTION 4
MECHANICAL ADJUSTMENTS
SECTION 5
ELECTRICAL ADJUSTMENTS
TAPE SPEED ADJUSTMENT
Setting:
Function: TAPE
Function: TAPE
Procedure:
1. Playback WS-48A (tape center) in the FWD state.
2. Adjsut the volume in CAPSTAN/REEL motor (M301) so that
1. Playback WS-48A (tape center) in the FWD state.
2. Adjsut the volume in CAPSTAN/REEL motor (M301) so that
the frequency counter reading becomes 3,000 Hz.
Specified Value: 2,930 to 3,030 Hz
3. Confirm that the frequency at the beginning and that at the
end of tape winding are between 2,940 to 3,060 Hz.
Adjustment Location:
PRECAUTION
1. Setting
MEGA BASS control : OFF
TAPE DECK SECTION
0 dB=0.775 V
Test tape
Type
Signal
Used for
WS-48A
3 kHz, 0 dB
Tape Speed Adjustment
+
–
–
set
Test tape
WS-48A
(3 kHz, 0 dB)
WS-48A
(3 kHz, 0 dB)
frequency counter
3.2
Ω
POWER board
CNP392 pin
CNP392 pin
2
POWER board
CNP392 pin
CNP392 pin
1
Tape speed
Adjustment
Adjustment
CAPSTAN/REEL motor
(M301)
(M301)
– TAPE deck block –
Mode
Tension Meter
Meter Reading
FWD
CQ-403A
more than 100 g
(more than 3.53 oz)
• Tape Tension Measurement
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 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)
0.15 – 5.39 mN•m
FWD
CQ-102C
(1.5 – 5.5 g•cm)
Back Tension
(0.021 – 0.076 oz•inch)
more than 5.89 mN•m
FF
CQ-201B
(more than 60 g•cm)
(more than 0.83 oz•inch)
more than 5.89 mN•m
REW
CQ-201B
(more than 60 g•cm)
(more than 0.83 oz•inch)
15
CFD-E77L
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter
T1
450 kHz
MW VCO VOLTAGE ADJUSTMENT
Frequency Display
Reading on Digital Voltmeter
531 kHz
0.9
±
0.5 V
1,611 kHz
5.2
±
0.6 V
MW TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L3-1
621 kHz
CT3
1,404 kHz
LW VCO VOLTAGE ADJUSTMENT
Adjustment Part
Frequency Display
Reading on Digital Voltmeter
L4
153 kHz
0.6
±
0.3 V
Confirmation
279 kHz
5.0
±
0.15 V
LW TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L3-2
162 kHz
CT5
261 kHz
FM IF ADJUSTMENT
Adjust for a minimum reading on level meter
T2
10.7 MHz
FM VCO VOLTAGE ADJUSTMENT
Adjustment Part
Frequency Display
Reading on Digital Voltmeter
L2
108 MHz
3.0
±
0.3 V
Confirmation
87.5 MHz
1.3
±
0.4 V
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L1
87.5 MHz
CT1
108 MHz
Adjustment Location: TUNER and POWER board (See page 16)
TUNER SECTION
0 dB=1
µ
V
[MW/LW]
Setting:
Function : RADIO
RADIO BAND button : MW or LW
Function : RADIO
RADIO BAND button : MW or LW
[FM]
Setting:
Function : RADIO
RADIO BAND button: FM
Function : RADIO
RADIO BAND button: FM
• Repeat the procedures in each adjustment several times, and the
tracking adjustments should be finally done by the trimmer ca-
pacitors.
pacitors.
• Remove FM antenna in FM adjustment.
AM RF signal
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.
+
–
–
level meter
set
3.2
Ω
POWER board
CNP392 pin 2
CNP392 pin 2
POWER board
CNP392 pin 1
CNP392 pin 1
FM RF signal
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
+
–
–
level meter
POWER board
CNP392 pin 2
CNP392 pin 2
POWER board
CNP392 pin 1
CNP392 pin 1
set
3.2
Ω
0.01
µ
F
TUNER board
TP (GND)
TP (GND)
TUNER board
TP (ANT)
TP (ANT)
digital voltmeter
TP (VT)
TP (GND)
100 k
Ω
TUNER board
16
CFD-E77L
Adjustment Location:
TP
(VT)
TP
(GND)
TP
(ANT)
– TUNER BOARD (Component Side) –
– TUNER BOARD (Conductor Side) –
L4
LW VCO Voltage Adjustment
L2
FM VCO Voltage Adjustment
MW Tracking Adjustment
L3-1
CT3
LW Tracking Adjustment
CT5
L3-2
FM Tracking Adjustment
T1 AM IF Adjustment
T2 FM IF Adjustment
L1
CT1
CT1
– POWER BOARD (Conductor Side) –
1
4
CNP392
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