Sony HCD-DX10 / HCD-RG20 / HCD-RG30T / HCD-RG4SR / MHC-DX10 / MHC-RG20 / MHC-RG30T / MHC-RG4SR Service Manual ▷ View online
13
HCD-DX10/RG4SR/RG20/RG30T
SECTION 4
ELECTRICAL ADJUSTMENTS
FM Tuned Level Adjustment
Procedure:
1.
1.
Supply a 98 MHz signal at 28 dB from the ANTENNA terminal.
2.
Tune the set to 98 MHz.
3.
Adjust RV101 to the point (moment) when the TUNED
indicator will change from going off to going on.
indicator will change from going off to going on.
Adjustment Location: MAIN board
Null Adjustment
Procedure:
1.
1.
Supply a 98 MHz signal at 60 dB from the ANTENNA terminal.
2.
Tune the set to 98 MHz.
3.
Measure voltage between pin 21 and pin 23 of IC 101. Adjust
T101 until the voltage becomes 0 V.
T101 until the voltage becomes 0 V.
Adjustment Location: MAIN board
[MAIN BOARD] Component side
FM RF Signal generator
75
Ω
coaxial
Carrier frequency : 98 MHz
Modulation : AUDIO 1 kHz, 75 kHz
deviation (100%)
Output level : 30 dB (at 75
Modulation : AUDIO 1 kHz, 75 kHz
deviation (100%)
Output level : 30 dB (at 75
Ω
open)
FM ANTENNA terminal
(JK101)
(JK101)
set
FM RF Signal generator
75
Ω
coaxial
Carrier frequency : 98 MHz
Modulation : AUDIO 1 kHz, 75 kHz
deviation (100%)
Output level : 60 dB (at 75
Modulation : AUDIO 1 kHz, 75 kHz
deviation (100%)
Output level : 60 dB (at 75
Ω
open)
FM ANTENNA terminal
(JK101)
(JK101)
set
T101
RV101
IFT101 : AM IF
T101:NULL
RV101:FM TUNED LEVEL
AM RF Signal generator
30% amplitude
modulation by
400Hz signal
output level : as low as possible
modulation by
400Hz signal
output level : as low as possible
AM ANTENNA terminal
(JK101)
(JK101)
set
AM IF Adjustment
TUNER SECTION
Procedure:
1.
1.
Set the frequency of the AM RF signal generator to 1000 kHz
(at 10 kHz step) or 999 kHz (at 9 kHz step).
(at 10 kHz step) or 999 kHz (at 9 kHz step).
2.
Tune the set to AM 1000 kHz (at 10 kHz step) or 999 kHz (at 9
kHz step).
kHz step).
3.
Adjust IFT101 so that the reading on level meter becomes in
maximum.
maximum.
headphones jack (JK601)
level meter
set
16
Ω
14
HCD-DX10/RG4SR/RG20/RG30T
CN732
CN733
CN731
TP connected to pin
q;
(IC751)
C746A
Adjustment Location: CD board
[CD BOARD] (Component Side)
CD SECTION
RF Level Check
Procedure :
1. Connect oscilloscope to pin q; (IC751).
2. Turned Power switch on.
3. Load a disc (YEDS-18) and playback.
4. Confirm that oscilloscope waveform is clear and check RF signal
1. Connect oscilloscope to pin q; (IC751).
2. Turned Power switch on.
3. Load a disc (YEDS-18) and playback.
4. Confirm that oscilloscope waveform is clear and check RF signal
level is correct or not.
IC751 pin
q;
GND
CD board
oscilloscope
Note :
Clear RF signal waveform means that the shape “
◊
” can be clearly
distinguished at the center of the waveform.
RF signal waveform
VOLT/DIV : 200mV
TIME/DIV : 500ns
TIME/DIV : 500ns
level : 1.4 to 2.1 Vp-p
Note :
1. CD Block is basically designed to operate without adjustment.
Therefore, check each item in order given.
2. Use YEDS-18 disc (3-702-101-01) unless otherwise indicated.
3. Use an oscilloscope with more than 10M
3. Use an oscilloscope with more than 10M
Ω
impedance.
4. Clean the object lens by an applicator with neutral detergent
when the signal level is low than specified value with the
following checks.
following checks.
15
15
HCD-DX10/RG4SR/RG20/RG30T
SECTION 5
DIAGRAMS
Note on Schematic Diagram:
• All capacitors are in µF unless otherwise noted. pF: µµF
• All capacitors are in µF unless otherwise noted. pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.
and tantalums.
• All resistors are in
Ω
and
1
/
4
W or less unless otherwise
specified.
•
f
: internal component.
•
C
: panel designation.
Note on Printed Wiring Boards:
• X
: parts extracted from the component side.
• b
: Pattern from the side which enables seeing.
• Indication of transistor.
Note:
The components identi-
fied by mark
The components identi-
fied by mark
0
or dotted
line with mark
0
are criti-
cal for safety.
Replace only with part
number specified.
Replace only with part
number specified.
Note:
Les composants identifiés par
une marque
Les composants identifiés par
une marque
0
sont critiques
pour la sécurité.
Ne les remplacer que par une
piéce portant le numéro
spécifié.
Ne les remplacer que par une
piéce portant le numéro
spécifié.
•
A
: B+ Line.
•
B
: B– Line.
•
H
: adjustment for repair.
• Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
• Voltages are taken with a VOM (Input impedance 10 M
Ω
).
Voltage variations may be noted due to normal produc-
tion tolerances.
no mark : FM
<
tion tolerances.
no mark : FM
<
> : CD
[
] : TAPE
• Waveforms are taken with a oscilloscope.
Voltage variations may be noted due to normal produc-
tion tolerances.
tion tolerances.
• Circled numbers refer to waveforms.
• Signal path.
F
: FM
E
: PB (DECK A)
d
: PB (DECK B)
G
: REC (DECK B)
J
: CD
THIS NOTE IS COMMON FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS.
(In addition to this, the necessary note is printed in each block.)
(In addition to this, the necessary note is printed in each block.)
C
B
These are omitted.
E
Q
B
These are omitted.
C
E
Q
• Abbreviation
CND : Canadian model
AUS
AUS
: Australian model
AR
: Argentina model
SP
: Singapore model
TW
: Taiwan model
MX
: Mexican model
MY
: Malaysia model
E2
: 120V AC Area in E model
E3
: 240V AC Area in E model
E51
: Chilean and Peruvian model
5-1. CIRCUIT BOARD LOCATION
• WAVEFORMS
– MAIN BOARD –
– PANEL BOARD –
– CD BOARD –
MOTOR board
ADDRESS SENSOR board
SENSOR board
DRIVER board
TRANS board
VIDEO OUT board
SPDL board
SUB TRANS board
MAIN board
POWER board
PANEL board
CD board
1
IC751
rf
(XOUT)
4.9Vp-p
59 ns
2
IC102
wf
(XOUT)
3.2Vp-p
222
µ
s
4
IC601
qj
(XTAL 6.0MHz)
4.8Vp-p
167 ns
3
L251
14.1Vp-p
16.6
µ
s
(60.1 kHz)
16
16
HCD-DX10/RG4SR/RG20/RG30T
5-2. BLOCK DIAGRAMS
TUNER/CD SECTION
: FM
: CD
• Signal Path
• R-CH is omitted due to same as L-CH
FM 75
Ω
G
AM
JK101
ANT IN
1
7
IF OUT
8
OSC OUT
5
VT
FND1
FND1
EXCEPT RG20:AEP,UK
ANT IN
1
7
IF OUT
8
OSC OUT
5
VT
RG20:AEP,UK
+B
TU+12V
Q102
FM
10
FM OSC
15
VT1 IN
18
VT1
17
PD1
19
PLL
IC102
12
FM/AM IF
7
FM
14
AM OSC
2
VCO STOP
8
IF REQ
6
DO
4
DI
5
CL
3
CE
XIN
1
XOUT
24
CX101
4.5MHz
RF IF
AMP
AMP
Q101
CF101
CF102
DI
DO
CLK
CE
1
13
3
4
5
5
12
2
14
15
11
6
7
9
RB101
19
AM MIX OUT
IF OUT
9
AM/IF
12
AM OSC
24
VCO STOP
13
IF REQ MUTE
8
AM RF IN
20
AM OSC
22
V REG
23
FM IF
1
AM/FM IF MPX
IC101
11
L OUT
10
R OUT
MUTE
Q106
18
AM IF IN
IFT101
T101
R-CH
A
MAIN
SECTION
6
TUNED
7
STEREO
3
FM SD ADJ
5
FMDET
RV101
TUNER MUTE OUT
77
LC72131 CE
93
CLK
97
LC72131 DI
96
LC72131 BU2114 DO
95
TU STEREO
9
TUNED
10
MASTER CONTROL
IC601(1/2)
DO
CLK
CE
DI
L-CH
COIN
98
SQCK
100
CD RWC
2
CD DRF
8
CD SL+
5
CD SL-
4
TBL ADDRESS
SENSOR
68
IC711
69
CD PIC UP/DOWN SW
70
CD TRAY OPEN SW
71
CD TRAY CLOSE SW
73
CD MOTOR +
OPEN/CLOSE
S701
BU UP/
DOWN
S711
74
MOTOR
DRIVE
9
7
4
2
M
IC701
TURN
MOTOR
M721
OPTICAL PICK-UP
BLOCK
(KSM-213D)
LD
DRIVER
Q731
+5V
LD
GND
FOCUS
COIL
F+
F
T+
T
TRACKING
COIL
IC781
FCS/TRK COIL
SL/SP MOTOR
SL/SP MOTOR
DRIVER
ASP
IC731
1
2
27
26
VR
PD
11
12
18
17
3
CH1 INA
7
MUTE
CH1 OUTA
M
M
MOTOR
SLED
MOTOR
SPINDLE
S01
LIMIT
41
RF SM
VR
58
VCC
VC
A
B
C
D
E
F
DETECTOR
FIN 1
FIN 2
E
3
F
4
LDD
62
LDS
63
FD
16
TO
15
SLD
29
SPD
27
52
DATA
50
CLK
51
CL
53
CE
34
TGL
54
DRF
39
CV-
40
CV+
30
SL-
Q775
31
SL+
35
TOFF
44
SLI
49
DEF
36
TES
37
HFL
33
JP+
32
JP-
DSP
IC751
EFMI
10
EFMO
9
DEF
1
TES
16
HFL
15
JP+
19
JP-
20
COIN
56
4.2M
61
CQCK
57
RWC
54
TGL
18
TOFF
17
CLV+
12
CLV-
13
45
XI
44
XO
X701
16.9344M
37
L CH
40
R CH
R CH
B
MAIN
SECTION
CD-L
2
1
38
SLOF
VP
14
MUTE
Q771,773
CH1 OUTB
CH4 OUTA
CH4 OUTB
CH21 OUTB
CH2 OUTA
CH3 OUTB
CH3 OUTA
4
CH1 INB
25
CH4 INA
9
CH2 INB
20
CH3 INB
SHUTER IN/OUT
28
D MUTE
26
LIMIT SW
27
3
PDO
58
RESET
D732
35
L MUTE
D733
D735
C
MAIN
SECTION
DO,CLK
53
WRQE
55
SQ0UT
CD A MUTE
6
CD WRQ
7
SQOUT
99
CD RESET OUT
3
CD MOTOR-
CD NUMBER SENSOR
NULL
AM IF
FM TUNED
LEVEL
+6.8V
Ver 1.2 2003.11
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