Sony HCD-LX20I Service Manual ▷ View online
HCD-LX20i
13
SECTION 5
ELECTRICAL ADJUSTMENTS
TUNER SECTION 0 dB = 1 μV
[AM]
Setting:
Function: TUNER
Band: AM
Setting:
Function: TUNER
Band: AM
AM RF signal
generator
30% amplitude
modulation by
400 Hz signal
60 cm
set
loop antenna A
loop antenna B
[FM]
Setting:
Function: TUNER
Band: FM
Setting:
Function: TUNER
Band: FM
FM RF signal
generator
1 kHz frequency
deviation by FM 75 kHz
signal
Output level:
as low as possible
+
–
level meter
MAIN board
JW828
(GND)
MAIN board
TP (TUNER OUT L-ch)
set
MAIN board
J802 pin
MAIN board
J802 pin
digital voltmeter
JW821 (VT)
JW828 (GND)
10 k
Ω
MAIN board
• Repeat the procedures in each adjustment several times, and
the tracking adjustments should be fi nally done by the trimmer
capacitors.
capacitors.
• Remove FM antenna in FM adjustment.
AM VT VOLTAGE CONFIRMATION
Frequency Display Reading on Digital Voltmeter
530 kHz
1.6 ± 0.3 V
1,710 kHz
8 ± 0.5 V
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L851
620 kHz
FM VT VOLTAGE ADJUSTMENT
Adjustment Part Frequency Display Reading on Digital Voltmeter
L805
87.5 MHz
1.7 ± 0.1 V
Confi rmation
108 MHz
6.2 ± 0.5 V
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L804
98 MHz
FM DETECTOR ADJUSTMENT
Setting:
Function: TUNER
BAND button: FM
Setting:
Function: TUNER
BAND button: FM
set
MAIN board
TP (TUNER OUT L-ch)
TP (TUNER OUT L-ch)
MAIN board
JW828 (GND)
JW828 (GND)
Carrier frequency : 98 MHz
Modulation
Modulation
: deviation by
FM 75 kHZ
Output level
: 60 dB
FM RF Signal
generator
generator
1. Tune the set to 98 MHz.
2. Adjust L806 so that modulation distortion may become the
2. Adjust L806 so that modulation distortion may become the
best in the vicinity of the maximum value where the tuner out
level becomes –15 dBs or more.
level becomes –15 dBs or more.
Adjustment Location:
L851
AM Tracking
Adjustment
JW821
(VT)
JW828
(GND)
TP
(TUNER
OUT L-ch)
J802
1
3
L804
FM Tracking
Adjustment
L805
FM VT Voltage
Adjustment
TP
(TUNER
OUT R-ch)
L806
FM Detector
Adjustment
– MAIN Board
(Component Side) –
(Component Side) –
– MAIN Board
(Conductor Side) –
(Conductor Side) –
HCD-LX20i
14
FM TUNE LEVEL CHECK
signal
generator
set
Procedure:
1. Turn on the set.
2. Input the following signal from signal generator to FM antenna
1. Turn on the set.
2. Input the following signal from signal generator to FM antenna
input directly.
Carrier frequency : A = 87.5 MHz, B = 98 MHz, C = 108 MHz
Deviation
Deviation
: 75 kHz
Modulation
: 1 kHz
ANT input
: 35 dBu (EMF)
Note: Use 75 ohm coaxial cable to connect signal generator and the set.
You cannot use video cable for checking.
Use signal generator whose output impedance is 75 ohm.
3. Set to FM tuner function and tune A, B and C signals.
4. Confi rm “TUNED” is lit on the display for A, B and C sig-
4. Confi rm “TUNED” is lit on the display for A, B and C sig-
nals.
When the selected station signal is received in good condition,
“TUNED” is displayed.
“TUNED” is displayed.
CD SECTION
Note:
1. CD Block is basically constructed to operate without adjustment.
2. Use YEDS-18 disc (Part No. 3-702-101-01) unless otherwise indicat-
1. CD Block is basically constructed to operate without adjustment.
2. Use YEDS-18 disc (Part No. 3-702-101-01) unless otherwise indicat-
ed.
3. Use an oscilloscope with more than 10 M
Ω impedance.
4. Clean the object lens by an applicator with neutral detergent when the
signal level is low than specifi ed value with the following checks.
5. Check the focus bias check when optical pick-up block is replaced.
FOCUS BIAS CHECK
+
–
–
CD board
TP122 (RFEQO)
TP124 (VC)
oscilloscope
(DC range)
Procedure:
1. Connect oscilloscope to TP122 (RFEQO) and TP124 (VC) on
1. Connect oscilloscope to TP122 (RFEQO) and TP124 (VC) on
the CD board.
2. Press the [
?/1
] button to turn the power on.
3. Press the [FUNCTION +] button to select CD function.
4. Set the disc (YEDS-18) and press the [
4. Set the disc (YEDS-18) and press the [
7
] button to play-
back.
5. Confi rm that oscilloscope waveform is as shown in the fi gure
below. (eye pattern)
A good eye pattern means that the diamond shape (
◊) in the
center of the waveform can be clearly distinguished.
VOLT/DIV: 200 mV
TIME/DIV: 500 ns
level:
1.2 ± 0.3 Vp-p
Checking Location:
IC101
TP124 (VC)
TP122
(RFEQ)
– CD Board (Conductor Side) –
HCD-LX20i
HCD-LX20i
15
15
SECTION 6
DIAGRAMS
6-1. BLOCK DIAGRAM - CD, TUNER Section -
OPTICAL PICK-UP BLOCK
(KSM-215CFP)
B
C
D
D
E
A
F
SP+
SP-
LD
PD
VC
AUTOMATIC
POWER
CONTROL
Q301
COIL/MOTOR DRIVER
IC401
CD-MP3 PROCESSOR
IC101
SP+
2
SP-
1
SPIN 3
SL+
SL-
SL+
12
SL-
11
SLIN 9
T+
T-
T+
18
T-
17
TIN 20
F+
F-
F+
26
F-
27
FIN 24
M-MUTE 7
97 B
94 C
96 D
94 C
96 D
100 E
95 A
98 F
91 LDO
MDI
84 VRO
13 DMO
92
12 FMO
10 TRO
9 FOO
XO
XI
X102
16.934MHz
S201
(LIMIT)
24
23
IN_SW
CD D +3.3V
20
LOUT
CD-L
30
ROUT
R-CH
27
BUS0 38
BUS1 39
BUS1 39
BUS0
17
BUS1
18
BUS2 40
BUS3 41
BUS3 41
BUS2
19
BUS3
20
O-CD BUCK
25
O-CD CCE
26
XRST 37
O-CD RESET
27
O-CD-DR MUTE
23
I-CD REQ
24
SBSY 54
I-CD SBSY
43
B
A
C
AM/FM-DET, OSC, MIX, PLL, IF AMP
IC801
36 FMRF-O
8 FM-IF
22 MPX-IN
1 AM-IN
31 AM-OSC
7
I-TU-DO
56
O-TU-CLK
55
O-TU-CE
57
O-TU-DI
46
I-TU ANSD
X801
75kHz
20
19
XIN
XOUT
16
DI
17
CL
15
CE
18
DO
25
AGC
3
J802
ANTENNA
FM/AM
1
BAND-PASS
FILTER
CF805
FM MIX
AMP
Q803
AM TRACKING
L851
AM RF
D851
7 AM-IF
L803
AM IF
34 FMRF-O
FM TRACKING
L804
32 FM-OSC
FM VT VOLTAGE
L805
FM OSC
L804
FM RF
+9V
11 FM-DET
FM DETECTOR
L806
FM DET
3
FM-MIX
23
FM-OUT
12
L-OUT
13
R-OUT
R-CH
30
BO2
BO2
TUNER-L
5
AM-MIX
24
AM-OUT
CF803
CF801
• SIGNAL PATH
: CD PLAY
• R-ch is omitted due to same as L-ch.
: TUNER (FM/AM)
O-CD-LOAD OUT 8
O-CD-LOAD IN 10
LOAD-OUT
LOAD-IN
LOAD-IN
SW OUT SIDE
SW CHEC
SW CHEC
I-SW CD CHECK/OUT 40
DRIVER BOARD
SYSTEM CONTROLLER
IC501 (1/2)
42
BUCK
43
XCCE
48
REQ
HCD-LX20i
HCD-LX20i
16
16
6-2. BLOCK DIAGRAM - MAIN Section -
SYSTEM CONTROLLER
IC501 (2/2)
RSTX 54
+5V
REGULATOR
IC401
VBUS +5V
+4V
REGULATOR
IC451
VOLTAGE
DETECTOR
IC452
BU +3.3V
+9V
REGULATOR
IC202
AUDIO +9V
VSTBY
REGULATOR
Q191
TUNER +5V
REGULATOR
Q802
TUNER +3V
REGULATOR
Q801
D121
D192
D451
T001
POWER TRANSFORMER
MOTOR DRIVER B+
V +6.5V
(AC IN)
F001
RECT
D101 -104
AC DETECT
Q162, 164, 165
RECT
Q119 - 126,
Q128, 129
RESET
SWITCH
Q654
X593
6MHz
X1
X0
92
93
X513
32.768kHz
X1A
X0A
14
13
I-RMC
9
REMOTE CONTROL
RECEIVER
IC453
D453
O-LED-STBY
22
LCD451
LIQUID
CRYSTAL
DISPLAY
S938, SW471 - 476, 481,
SW491 - 497, 941, 942
(FRONT PANEL KEYS)
I-KEY_1, I-KEY_2,
I-KEY WAKE UP
I-KEY WAKE UP
37, 38, 41
COM0 - COM3
59 - 62
SEG0 - SEG31
63, 64, 67 - 89, 94 - 100
STANDBY
LED DRIVE
Q431
D454
O-LED
5
(LCD BACK LIGHT)
21
O-IPOD POWER
+3.3V
REGULATOR
IC421
CD A +3.3V
4
O-CD/USM 3.3V ON
+3.3V
REGULATOR
IC422
CD D +3.3V
+1.5V
REGULATOR
IC201
CD +1.5V
I-HOLD 42
B+ SWITCH
Q171
C
BO2
MAIN POWER
ON/OFF CONTROL
Q175
OVER CURRENT
DETECT
Q172 - 174
2
O-POWER
I-P-MONI 36
R-CH
AUDIO IN
J921
26
SDA
25
SCL
8
12
AU-L
VOL-L
6 CD-L
IP-L
O-FUNC SD 12
O-FUNC SC 11
O-FUNC SC 11
O-AMP-ON 3
9
SEL-L
19
OUT-L
21
SR
20
SB-L
INPUT SELECTOR,
ELECTRICAL VOLUME
IC201
: TUNER (FM/AM)
: CD PLAY
: iPod
SIGNAL PATH
R-ch is omitted due to same as L-ch.
: AUDIO IN
B
CD-L
4 TU-L
A
TUNER-L
CN951
(iPod Dock)
27
28
28
LINE AMP
IC203
POWER
AMP
IC301
R-CH
18
19
30
19
30
LINE-OUT-L
LINE-OUT-R
RXD
TXD
DGND
I-IPOD TXD
O-IPOD RXD
I-IPOD DETECT
2
48 33 47
J931
R-CH
PHONES
SPEAKER
IMPEDANCE
USE 4
Ω
+
–
–
+
R
L
J351
DC DETECT
Q161
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