Sony HTC-NX300 / MHC-NX300AV Service Manual ▷ View online
17
REC Bias Adjustment
DECK B
Procedure:
1. Mode: Record
1. Mode: Record
2. Mode: Playback
3. Confirm playback the signal recorded in step 1 become speci-
fied value as follows.
If these values are out of specified value, adjust the RV341
(L-CH) and RV441 (R-CH) on the AUDIO board to repeat
steps 1 and 2.
If these values are out of specified value, adjust the RV341
(L-CH) and RV441 (R-CH) on the AUDIO board to repeat
steps 1 and 2.
Specified value: Playback output of 315 Hz to playback
output of 10 kHz: ± 0.5 dB
Adjustment Location: AUDIO board
REC Level Adjustment
DECK B
Procedure:
1. Mode: Record
1. Mode: Record
2. Mode: Playback
3. Confirm playback the signal recorded in step 1 become speci-
fied value as follows.
If these values are out of specified value, adjust the RV301
(L-CH) and RV351 (R-CH) on the MAIN board to repeat steps
1 and 2.
If these values are out of specified value, adjust the RV301
(L-CH) and RV351 (R-CH) on the MAIN board to repeat steps
1 and 2.
Specified value:
AUDIO OUT jack PB level: 47.2 to 53.0 mV (–24.3 to –23.3 dB)
AUDIO OUT jack PB level: 47.2 to 53.0 mV (–24.3 to –23.3 dB)
Adjustment Location: MAIN board
– MAIN BOARD (Conductor Side) –
– AUDIO BOARD (Component Side) –
– LEAF SW BOARD (Component Side) –
RV401
RV301
RV341
RV311
RV411
IC602
CN601
L
R
R L
RV441
PB LEVEL
– DECK B –
REC BIAS
L
R
PB LEVEL
– DECK A –
TAPE SPEED
RV1002
RV1001
(NORMAL) (HIGH)
CN1001
attenuator
1) 315 Hz
2) 10 kHz
2) 10 kHz
50 mV (–23.8 dB)
PFJ-1
or
STR-
NX300
AUDIO IN jack
600
Ω
blank tape
CN-123
CN-123
AF OSC
set
+
–
–
recorded
portion
portion
level meter
AUDIO OUT jack
PFJ-1
or
STR-
NX300
set
attenuator
315 Hz, 50 mV (–23.8 dB)
AUDIO IN jack
600
Ω
blank tape
CN-123
CN-123
AF OSC
PFJ-1
or
STR-
NX300
set
+
–
–
recorded
portion
portion
level meter
AUDIO OUT jack
PFJ-1
or
STR-
NX300
set
RV351
(R-CH)
RV301
(L-CH)
(L-CH)
IC301
REC
LEVEL
CN301
1
3
18
Note:
1. CD Block is basically designed to operate without adjustment. There-
fore, 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 10 M
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 specified value with the following checks.
5. Use the following extension cables and relay connector.
• Extension cable (19P) (Part No. J-2501-011-B)
Relay connector (Part No. J-2501-167-A)
(BD board CN101 to VIDEO board CN501)
(BD board CN101 to VIDEO board CN501)
• Extension cable (17P) (with connector) (Part No. J-2501-167-A)
(CONNECTOR board CN701 to MAIN board CN112)
6. Perform measurement by connecting to the STR-NX300.
1. S-CURVE CHECK
Procedure:
1. Connect oscilloscope to TP (FEO).
2. Connect between TP (FEO) and TP (VC) by lead wire.
3. Connect between TP (AGCCON) and TP (GND) by lead wire.
4. Turn the power ON.
5. Load a disc (YEDS-18) and turn the power ON again and ac-
1. Connect oscilloscope to TP (FEO).
2. Connect between TP (FEO) and TP (VC) by lead wire.
3. Connect between TP (AGCCON) and TP (GND) by lead wire.
4. Turn the power ON.
5. Load a disc (YEDS-18) and turn the power ON again and ac-
tuate the focus search. (Actuate the focus search when disc
tray is moving in and out)
tray is moving in and out)
6. Check the oscilloscope waveform (S-curve) is symmetrical
between A and B. And confirm peak to peak level within 2.4
± 0.7 Vp-p.
± 0.7 Vp-p.
S-curve waveform
7. After check, remove the lead wire connected in step 2.
Note:
• Try to measure several times to make sure than the ratio of A : B
or B : A is more than 10 : 7.
• Take sweep time as long as possible and light up the brightness
to obtain best waveform.
CD SECTION
A
B
symmetry
within 2.4
±
0.7 Vp-p
+
–
–
BD board
TP (RF)
TP (VC)
TP (VC)
oscilloscope
VOLT/DIV: 200 mV
TIME/DIV: 500 ns
TIME/DIV: 500 ns
level:
1.2
1.2
±
0.2 Vp-p
+
–
–
BD board
TP (FEO)
TP (VC)
TP (VC)
oscilloscope
2. RF LEVEL CHECK
Procedure:
1. Connect oscilloscope to TP (RF).
1. Connect oscilloscope to TP (RF).
As TP (RF) and TP (VC) are located at the edge of board, clip
them together with the board using alligator clips.
them together with the board using alligator clips.
2. Turn the power ON.
3. Load a disc (YEDS-18) and playback.
4. Confirm that oscilloscope waveform is clear and check RF
3. Load a disc (YEDS-18) and playback.
4. Confirm that oscilloscope waveform is clear and check RF
signal level is correct or not.
Note:
Clear RF signal waveform means that the shape “ ” can be clearly
distinguished at the center of the waveform.
distinguished at the center of the waveform.
RF signal waveform
19
Connecting points:
– BD BOARD (Side B) –
IC102
TP
(VC)
TP
(RF)
TP
(FEO)
IC101
TP (FEI)
TP
(TEO)
TP
(GND)
TP
(AGCCON)
IC103
– MAIN BOARD (Conductor Side) –
IC101
SL101
(ADJ)
(ADJ)
VIDEO SECTION
Note:
1. Perform measurement by connecting to the STR-NX300.
Frequency Adjustment
Connection:
Procedure:
1. Connect the frequency counter to TP (27 MHz) on VIDEO
1. Connect the frequency counter to TP (27 MHz) on VIDEO
board.
2. Turned power switch on.
3. Press the
3. Press the
[FUNCTION]
button to select the CD.
4. Adjust CT503 on the VIDEO board so that the frequency
counter reading 27.0 MHz ± 80 Hz at stop status.
Adjustment Location:
– VIDEO Board (Side B) –
+
–
–
TP (27 MHz)
VIDEO board
frequency counter
TP
(GND)
CT503
VIDEO
Frequency
Adjustment
TP
(27 MHz)
CN501
SL501
SL502
SL503
CN502
IC505
D502
21
21
HTC-NX300
CD MECHANISM CONTROLLER
IC505 (1/2)
A/D
CONVERTER
VO1 (+)
VO1 (–)
5
4
7
2
1
5
10
6
6
7
8
16
15
14
13
10
11
22
4
3
27
23
26
5
6
2
3
17
18
15
16
A
E
B
C
D
A
CD A+5V
CD A+5V
F
DETECTOR
A
B
C
D
RF
SUMMING
AMP
LEVEL SHIFT
Q701
MOTOR
DRIVE
M702
(LOADING)
DISC IN DETECT
SENSOR
D704,Q703
RF EQ
SWITCH
Q102
FOCUS
ERROR AMP
RF EQ
AMP
TRACKING
ERROR AMP
RFO
RFE
CTL1
FE
RF AMP,
FOCUS/TRACKING ERROR AMP
IC103
TE
E
F
F I-V AMP
E I-V AMP
AUTOMATIC
POWER CONTROL
Q101
OPTICAL
TRANSCEIVER
IC207
CD DIGITAL OUT
OPTICAL
APC LD
AMP
APC PD
AMP
LD
LD
PD
LASER DIODE
RFAC
ASYO
ASYI
CTL2
FILTER
FILO
PCO
CLTV
FILI
DIGITAL PLL
ASYMMETRY
CORRECTOR
EFM
DEMODULATOR
DIGITAL SIGNAL PROCESSOR
IC101 (1/2)
MDP
DIGITAL
CLV
PROCESSOR
32K
RAM
ERROR
CORRECTOR
INTERNAL BUS
SQCK
SQSO
MUTE
EXCK
PCMD
DATA
BCK
LRCK
C2PO
C4M
XTSL
XTAO
XTAI
BCK
LRCK
WDCK
C2PO
CTL1
MD2
DOUT
DIGITAL
OUT
D/A
DIGITAL
INTERFACE
CLOCK
GENERATOR
SUBCODE
PROCESSOR
SCOR
WFCK
XUGF
GFS
EMPH
SENSE
DATA
CLOK
XLAT
SBSO
SENSE CLK
SENSE
DSP CLK
DSP DATA
DSP LATCH
SE
TE
FE
RFDC
FOCUS/
TRACKING/SLED
SERVO DSP
FOCUS/TRACKING/SLED
PWM GENERATOR
SFDR
IN1
IN2
OUT1
OUT2
ENCODE2
ENCODE1
ENCODE0
DISC SENS
OPIN4 (+)
OPIN3 (–)
OPIN4 (–)
VO4 (+)
VO4 (–)
OPIN2 (+)
OPIN2 (–)
OPIN1 (+)
OPIN1 (–)
STBY2
STBY1
SRDR
TFDR
TRDR
FFDR
FRDR
SSTP
COUT
S101
(LIMIT)
CD A+5V
MIRR,
DFCT, FOK
DETECTOR
DISC TRAY
ADDRESS DETECT
SERVO AUTO
SEQUENCER
SERVO
INTERFACE
CPU INTERFACE
SCLK
TO CPU INTERFACE
FOK
MIRR
DFCT
VO3 (+)
VO3 (–)
M101
(SPINDLE)
MOTOR
DRIVE
XRST
LDON
DSP MUTE
MOTOR
DRIVE
COIL
DRIVE
VO2 (+)
VO2 (–)
COIL
DRIVE
M
M
M102
(SLED)
05
FOCUS/TRACKING COIL DRIVE,
SPINDLE/SLED MOTOR DRIVE
IC102
2-AXIS
DEVICE
(TRACKING)
(FOCUS)
DIGITAL SERVO
PROCESSOR
IC101 (2/2)
OPTICAL PICK-UP BLOCK
(KSS-213B/Z-N)
LDON
21
HOLD SW
PD
(Page 22)
• SIGNAL PATH
: CD PLAY
: DIGITAL OUT
I-V AMP
12
11
13
14
CTRL1
CTRL2
CTL1
CTL2
SUBQ DATA
SUBQ CLK
SCOR
MCLK
33.8MHz
B
(Page 22)
DATA, BCK,
LRCK, C2PO
C
(Page 22)
IC104
RESET
DEVICE RESET
XRST
PRTC SW
S702
S702 (LID)
(ON: When CD lid is close.)
(ON: When CD lid is close.)
S701 (MID OUT)
(ON: When tray is going to open/close.)
(ON: When tray is going to open/close.)
S708 (OUT)
(ON: When tray is open.)
(ON: When tray is open.)
S704 (IN)
(ON: When sub tray set to play position.)
(ON: When sub tray set to play position.)
S701
S708
S704
S703
S705
S706
MIDOUT SW
OUT SW
IN SW
MIDIN SW
INIT SW
CNT SW
XRESET
33
31
32
29
30
34
19
8
40 41 39 43
22
20
21
26
TO SERVO AUTO
SEQUENCER
50
53 55
XPCK
12
52 54
49
48
25
76 77
66
71
16
69
72
67
65
17
64
63
14
79 80
15
7
4 6 5
10 11 13 68
3
3 5 4
1
18
36 37
10
6
2
12
77
19
11
SYSTEM CONTROLLER
IC101 (1/3)
LOADING MOTOR DRIVE
IC702
4
56
63
65
68
69
70
92
3
6
7
2
M
MOTOR
DRIVE
M701
(ELEVATOR UP/DOWN)
IN1
IN2
OUT1
OUT2
ELEVATOR
UP/DOWN MOTOR DRIVE
IC701
3
6
7
2
M
67
66
20
9
60
58
59
61
57
93
2
ROTARY
ENCODER
S707
LOD NEG
LOD POS
CLP POS
CLP NEG
S703 (MID IN)
(ON: When sub tray move between tray and stocker.)
(ON: When sub tray move between tray and stocker.)
S705 (INIT)
(ON: When elevator down to bottom.)
(ON: When elevator down to bottom.)
S706 (COUNT)
(ON: When elevator up/down each sub tray stock position.)
(ON: When elevator up/down each sub tray stock position.)
SECTION 7
DIAGRAMS
7-1.
BLOCK DIAGRAM – SERVO Section –
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