Sony CMT-BX10 / CMT-BX20 / CMT-BX50BT / HCD-BX10 / HCD-BX20 / HCD-BX50BT Service Manual ▷ View online
HCD-BX10/BX20/BX50BT
17
SECTION 5
ELECTRICAL CHECKS
FM TUNE LEVEL CHECK
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.
Note:
1. CD Block is basically constructed to operate without adjust-
ment.
2. Use YEDS-18 disc (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 fol-
lowing checks.
lowing checks.
5. Check the focus bias check when optical pick-up block is re-
placed.
FOCUS BIAS CHECK
Procedure:
1. Connect oscilloscope to TP121 (RFI) and TP124 (VC) on the
1. Connect oscilloscope to TP121 (RFI) and TP124 (VC) on the
CD board.
2. Press the [
?/1
] button to turn the power on.
3. Set disc (YEDS-18) on the disc tray and press the [CD
u
]
button to playback.
4. 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.
Checking Location:
TUNER SECTION
CD SECTION
signal
generator
set
+
–
–
CD board
TP121 (RFI)
TP124 (VC)
oscilloscope
(DC range)
VOLT/DIV: 200 mV
TIME/DIV: 500 ns
level:
1.2 ±0.3 Vp-p
TP124
(VC)
– CD Board (Conductor Side) –
TP121
(RFI)
IC101
HCD-BX10/BX20/BX50BT
18
MEMO
HCD-BX10/BX20/BX50BT
HCD-BX10/BX20/BX50BT
19
19
SECTION 6
DIAGRAMS
6-1. BLOCK DIAGRAM - CD SERVO Section -
SYSTEM CONTROLLER
IC301 (1/4)
CD-MP3 PROCESSOR
IC101
MUTE
2-AXIS
DEVICE
(TRACKING)
(FOCUS)
95
89
A
AVDD
+3.3V
+3.3V
DETECTOR
FNi1 (A)
RFo
97 FPi1 (B)
88
2
AGCi
3
RFRP
RFZI
7
6
TEi
TEZi
83
RFEQo
81 RFi
82 RFRPi
82 RFRPi
30
LO
27
RO
38
BUS0
R-CH
94 FNi2 (C)
96 FPi2 (D)
100 TNi (E)
98 TPi (F)
91 LDo
92
MDi
2 VO1+
1 VO1–
13 DMo
AUTOMATIC
POWER CONTROL
Q301
LD
PD
LASER DIODE
OPTICAL PICK-UP
BLOCK
(KSM-213DCP)
B
C
D
E
F
12 FMo
10 TRO
9 FMO
20 IO0 (/HSO)
I-V AMP
M401
(SPINDLE)
M402
(SLED)
12 VO2–
11 VO2+
18 VO3+
17 VO3–
26 VO4+
27
7
IN4’ 24
IN3’ 20
IN2’ 9
IN1 3
BIAS 23
84 VRo
VO4–
M
M
FOCUS/TRACKING COIL DRIVE,
SLED/SPINDLE MOTOR DRIVE
IC401
S201
(LIMIT)
DVDD
+3.3V
24
XO
23
XI
X102
16.9344MHz
60 CD DRIVER MUTE
LOADING
MOTOR DRIVE
IC311
CDM LOAD IN 85
CDM LOAD OUT
CDM SW (OPEN)
CDM SW (CLOSE)
84
88
87
M
A
CD-L
: CD PLAY
SIGNAL PATH
R-ch is omitted due to same as L-ch.
VCC
A
B
C
D
E
F
LD
PD
SP+
VC
SP–
SL+
SL–
T+
T–
F+
F–
3 CD BUS0
39
BUS1
2 CD BUS1
40
BUS2 (SO)
1 CD BUS2
70 CD CLK
41
BUS3 (SI)
100 CD BUS3
42
BUCK (CLK)
69 CD CCE
43
XCCE
54
SBSY
48
PIO0
68 MP3 IREQ
19 SBSY
37
XRST
59 CD RESET
S001
DISC TRAY
OPEN/CLOSE DETECT
OPEN
CLOSE
M001
(LOADING)
(Page 21)
HCD-BX10/BX20/BX50BT
HCD-BX10/BX20/BX50BT
20
20
6-2. BLOCK DIAGRAM - TUNER/BLUETOOTH Section -
ANT901
33 BT CTS
34 BT_RTS
31 BT DOUT
32 BT DIN
32 BT DIN
IC904
BLUETOOTH MODULE
10
A-OUT_P_L
9
A-OUT_N_L
5
A-IN_P_L
4
A-IN_N_L
8
A-OUT_P_R
7
A-OUT_N_R
41
UART_TXD
40
UART_RXD
38
UART_CTS
39
UART_RTS
45 BT_RESET
44 BT_AV_ROLE
12
PIO_00
46
RESET
MIX AMP
IC902
3
A-IN_P_R
2
A-IN_N_R
SYSTEM CONTROLLER
IC301 (2/4)
E
TUNER-L
PATTERN
ANTENNA
(FOR BLUETOOTH)
R-CH
R-CH
LINE AMP
IC901
(BX50BT)
F
BT-L
G
BT OUT-L
TUNER (FM/AM)
AM
FM ANT
AM ANT
L OUT
R OUT
DO/STEREO
R-CH
ST DIN
ST CLK
ST CE
FM 75
Ω
COAXIAL
ANTENNA
26 DATA IN/STEREO
TUNED
6 TUNER TUNED
28 ST DATA OUT
27 ST CLK
25 ST CE
27 ST CLK
25 ST CE
: TUNER (FM/AM)
SIGNAL PATH
R-ch is omitted due to same as L-ch.
: BLUETOOTH IN
: BLUETOOTH OUT
: AUDIO
(Page 21)
(Page 21)
(Page 21)
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