Sony CFD-S26 Service Manual ▷ View online
16
CFD-S26
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
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
T1
450 kHz
AM FREQUENCY COVERAGE
ADJUSTMENT
Frequency Display
530 kHz
1,710 kHz
Reading on Digital voltmeter
1.0 ± 0.1 V
5.3 ± 0.7 V
Adjustment Part
L4
<confirmation>
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L3
CT3
620 kHz
1,400 kHz
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 (JW2)
FM RF signal
generator
generator
0.01
µF
set
TUNER SECTION 0 dB = 1 µV
• FM Section
Setting:
RADIO (BAND) button: FM
RADIO (BAND) 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
• AM Section
Setting:
RADIO (BAND) button: AM
RADIO (BAND) button: AM
30% amplitude
modulation by
400 Hz signal
modulation by
400 Hz signal
• Connecting Level Meter (FM and AM)
• Connecting Digital Voltmeter (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.
done by the trimmer capacitors.
Adjustment Location: See page 17.
17
CFD-S26
TP
(FE)
TP
(TE)
TP
(FE)
TP
(RF)
TP
(VREF)
– CD board (conductor side) –
TP
(RF)
TP
(VREF)
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 CD N X button.
4. Confirm that the oscilloscope waveform is as shown in the
3. Press the CD N X 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
0.85
± 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 (VT)
(CONDUCTOR SIDE)
CT1
CT3
L1
L2
T2
T1
L3
– MAIN board (component side) –
TP (JW1)
L4
AM
FREQUENCY
COVERAGE
ADJUSTMENT
L2
FM
FREQUENCY
COVERAGE
ADJUSTMENT
CT3, L3
AM
TRACKING
ADJUSTMENT
CT1, L1
FM
TRACKING
ADJUSTMENT
T1
AM
IF
ADJUSTMENT
T2
FM
IF
ADJUSTMENT
18
CFD-S26
6-1. IC PIN DESCRIPTION
• IC802 uPD789477-907 (SYSTEM CONTROLLER)
Pin No.
Pin Name
I/O
Pin Description
1, 2
NC
—
Not used. (Open)
3 – 5
VLC2 – 0
O
LCD drive voltage output
6 – 9
COM0 – 3
O
LCD drive common output
10 – 26
S0 – 16
O
LCD drive segment output
27 – 29
S17 – 19
O
LCD drive segment output Not used. (Open)
30
BL-CONT
—
Not used. (Open)
31
A-MUTE
O
Audio mute output H: Mute
32
WB/FM.AM.TV
O
Tuner output level attenuator switch Not used. (Open)
33
DBB
O
MEGA BASS control output H: MEGA BASS off, L: MEGA BASS on
34
P-CON
O
System power control output H: PCON
35
AC-CHK
I
AC power supply detection signal input “L”: AC in
36
CD
O
CD function output H: CD
37
TAPE
O
Tape function output H: Tape
38
AVDD
—
Analog power supply pin for A/D converter (+3.3 V)
39
BTT-CHK-H
I
Battery check input for Hi-voltage
40
BTT-CHK-M
I
Battery check input for Mid-voltage
41
REC
I
Tape record signal input H: REC
42 – 45
KEY1 – 4
I
Key input
46
MODE CHK
I
Mode set input
47
AGND
—
Analog GND for A/D converter
48
REMOTE
I
Sircs receiver data input
49
TC-PLAY
I
Tape play switch input L: Tape
50
WP/INI
O
Initial set signal output
51
CD-DOOR
I
CD door open/close switch input L: Close
52
C-WRQ
I
CD command data input
53
C-DOUT
I
CD sireal data input
54
C-DIN
O
CD sireal data output
55
C-CLK
I
Serial data transfer clock signal input
56
R-COUNT
I
Tuner PLL data input
57
R-DATA
O
Tuner PLL data output
58
R-CLK
O
Tuner PLL clock output
59
R-LAT
O
Tuner PLL latch output
60
B-MUTE
O
Tuner mute signal output H: Mute
61
C-DRF
I
CD DRF signal input
62
C-CE
O
CD SENSE read clock output
63
C-FSEQ
I
CD frame SYNC input
64
C-XRT
O
CD system reset output
65
V-LAT
O
Volume latch output Not used. (Open)
66
V-DATA
O
Volume data output
67
V-CLK
O
Volume clock output
68
SUR
O
Surround switch signal output Not used. (Open)
69
ICO
—
Connected to GND
70
XT1
I
Sub system oscillation input (32.768 kHz)
71
XT2
O
Sub system oscillation output (32.768 kHz)
72
VDD
—
Main power supply pin for A/D converter (+3.3 V)
73
VSS
—
Main GND
74
X1
I
Main system oscillation input (4.19 MHz)
SECTION 6
DIAGRAMS
CFD-S26
19
19
Pin No.
Pin Name
I/O
Pin Description
75
X2
O
Main system oscillation output (4.19 MHz)
76
RST
I
System reset input
77
ISS1
O
ISS1 output Not used. (Open)
78
ISS2
O
ISS2 output Not used. (Open)
79
SCL
O
EEPROM clock output
80
SDA
I/O
EEPROM input/output
6-2. CIRCUIT BOARDS LOCATION
CONTROL (1) board
CONTROL (2) board
CONTROL (3) board
CD board
BATTERY TERMINAL (2) board
BATTERY TERMINAL (1) board
MAIN board
PRE board
POWER (1) board
POWER (2) board
VOLTAGE SELECT board
(E4 model only)
(E4 model only)
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