Sony D-F21 / D-F22ST / ICD-BP220 Service Manual ▷ View online
7
D-F21/F22ST
digital
voltmeter
voltmeter
100 k
Ω
TP81 (VT)
i
jack (J302)
set
16
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
TP3 (RF-IN)
FM RF signal
generator
generator
0.01
µ
F
set
TUNER SECTION 0 dB = 1 µV
• FM Section
Setting:
RADIO ON•BAND/MEMORY button : FM
STEP switch
RADIO ON•BAND/MEMORY button : FM
STEP switch
: 10k
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 ON•BAND/MEMORY button : AM
STEP switch
RADIO ON•BAND/MEMORY button : AM
STEP switch
: 10k
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.
• For FM adjustment, fix the FM RF coil (L1) as shown next page
and then perform tracking adjustment at L2 and CT1.
Lastly check the voltage value.
Lastly check the voltage value.
• For AM adjustment, fix the ferrite-rod antenna (L3) as shown
next page and then perform tracking adjustment at L4 and CT3.
Lastly check the voltage value.
Lastly check the voltage value.
Adjustment Location: See page 8.
SECTION 4
ELECTRICAL ADJUSTMENTS
FM FREQUENCY COVERAGE
CHECK
Frequency Display
87.5 MHz
108 MHz
Reading on Digital voltmeter
2.5 ± 1.5 V
7.0 ± 4.0 V
Adjustment Part
<confirmation> <confirmation>
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L2
CT1
87.5 MHz
108 MHz
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
T1
450 kHz
AM FREQUENCY COVERAGE
CHECK
Frequency Display
530 kHz
1,710 kHz
Reading on Digital voltmeter
1.0 ± 0.5 V
5.2 ± 0.7 V
Adjustment Part
<confirmation> <confirmation>
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L4
CT3
620 kHz
1,400 kHz
8
D-F21/F22ST
TP629
RF
– MAIN BOARD (SIDE B) –
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 TP629 (RF) and GND on
main board.
2. Insert the disc (YEDS-18). (Part No. : 3-702-101-01)
3. Press the N X button.
4. Confirm that the oscilloscope waveform is as shown in the
3. Press the 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:
When observing the eye pattern, set the oscilloscope for AC range
and raise vertical sensitivity.
and raise vertical sensitivity.
CN501
IC61
TP81
VT
TP3
RF-IN
– MAIN BOARD (SIDE A) –
CT3 L4
L3
L1
CT1
L2
L2
FM TRACKING ADJ
AM IF ADJ
T1
AM TRACKING
ADJ
RF level :
0.45
0.45
±
0.1 Vp-p
VOLT/DIV : 20 mV (10 : 1 probe in use)
TIME/DIV : 500 nS
TIME/DIV : 500 nS
9
D-F21/F22ST
SECTION 5
DIAGRAMS
5-1. IC PIN DESCRIPTIONS
• IC61 TC9327AF-631 (TUNER PLL, LCD DRIVER)
Pin No.
Pin Name
I/O
Pin Description
1 – 4
COM1 – 4
O
LCD driver signal output
5 – 20
S1 – 16
O
LCD driver signal output
21
AM STEP-I
I
AM 9K/10K tuning step select signal input (initialization)
22
DEST2-I
I
Bit2 tuner destination setting signal input (Fixed at “L” in this set)
23
DEST1-I
I
Bit1 tuner destination setting signal input (Fixed at “L” in this set)
24
DEST0-I
I
Bit0 tuner destination setting signal input (Fixed at “L” in this set)
25
XLOCAL/XMONO-DET-I
I
LOCAL/DX or MONO/STEREO ON-OFF switch detect signal input
26, 27
NC
—
Not used. (Open)
28
LCDREQ-I
I
LCD display request signal input
29
LID OPEN
I
CD door open detect signal input
30
EEP D0/D1-IO
I/O
Data signal input/output for EEPROM IC.
31
EEP SK-O
O
Clock signal output for EEPROM IC.
32
EEP CS-O
O
Chip select signal output for EEPROM IC.
33
XL/O-I
I
Line out signal input
34, 35
NC
—
Not used. (Open)
36
MEM-KEY (3-BIT)
I
Memory key signal input (Fixed at “H” in this set)
37
PRESET KEY
I
Not used in this set. (Open)
38
CD ACK-I
O
CD acknowledge signal output
39
CDON-IWP-CDU
I
CD ON request signal input (Wake-up tuner in sleep mode)
40
I/O (RESERVED)
—
Not used. (Open)
41
NC
—
Not used. (Open)
42
AD1 KEY
I
Set keys signal input
43
AD2 RMKEY
I
Remote key signal input (Fixed at “L” in this set)
44
AD3 BATT HIDC
I
Battery/HiDC level detect signal input
45
AD DC REF
I
Reference DC signal input of A/D.
46
SDI-I-CDU
I
Serial data signal input from system control IC.
47
SDO-O-CDU (RESERVED)
O
Serial data signal output to system control IC.
48
SCK-I-CDU
I
Serial clock signal input from system control IC.
49
TUBEEP-O
O
Beep sound control signal output
50
NC (I/O)
—
Not used. (Open)
51
XHOLD-I-SW
I
HOLD detect signal input
52
XAVLS-I-SW
I
AVLS detect signal input
53
XDC IN DET-I
I
DC-in detect signal input
54
TU ON-O
O
Tuner ON request signal output
55
ST OR DX-O-CTR
O
LOCAL/DX or MONO/STEREO ON-OFF control signal output
56
TUBASS2-O
O
MEGA BASS 2 sound mode signal output (Not used in this set)
57
TU TEST MODE
I
Tuner test mode detect signal input
58
TUBASS1-O
O
MEGA BASS 1 sound mode signal output (Not used in this set)
59
AM/XFM-O
O
Band control FM/AM signal output to tuner IC.
60
+B ON/OFF
O
Radio power ON/OFF signal output
61
IFREQ-O
O
IF request signal output
62
TUMUTE-O
O
Mute HP control signal output
63
TEST
—
Not used. (Open)
64
IFIN
I
FM/AM IF signal input
65
EO (DO1)
O
PLL error signal output
66
NC (DO2)
—
Not used. (Open)
67
HOLD
I
Not used. (Connect to ground in this set)
68
NC
—
Not used. (Open)
69
GND
—
Ground
70
FM IN
I
FM oscillation signal input
10
D-F21/F22ST
Pin No.
Pin Name
I/O
Pin Description
71
AM IN
I
AM oscillation signal input
72
VDD (1.8-2.2V)
—
Power supply pin
73
RESET
I
Power reset signal input
74
XOUT
O
Crystal oscillation signal output (75 kHz)
75
XIN
I
Crystal oscillation signal input (75 kHz)
76
VXT
—
Crystal oscillation signal pin
77
VLCD
—
LCD voltage doubler
78, 79
C1, 2
—
LCD voltage doubler
80
VEE
—
Constant voltage output to LCD.
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