Sony MHC-V818 Service Manual ▷ View online
– 21 –
VIDEO SECTION
Frequency adjustment
1. Connect the frequency counter to check point of the VIDEO
board.
2. Adjust CT503 of the VIDEO board so that the frequency counter
read 27MHz ± 80Hz at STOP condition.
[ VIDEO BOARD ] – SIDE B –
Adjustment Location :
[ VIDEO BOARD ] – SIDE A –
frequency counter
VIDEO board
(DCLK)
(DCLK)
+
–
–
SL501
IC502
IC506
(27MHz)
(GND)
SL502
SL503
TEST
MODE
SL501
D502
SL502
CT503
SL503
TEST MODE
VIDEO
FREQUENCY
FREQUENCY
(27MHz)
(GND)
IC507
IC505
– 22 –
SECTION 8
DIAGRAMS
8-1. CIRCUIT BOARDS LOCATION
SENSOR board
CONNECTOR board
BD board
MOTOR (SLIDE) board
MOTOR (TURN) board
POWER board
CONT (COM) board
AUDIO board
LEAF SW board
TRANSFORMER board
MAIN board
VIDEO board
CD-SW board
MIC board
PANEL board
HP board
TUNER(FM/AM)
DECO board
8-2. BLOCK DIAGRAMS
– CD SECTION –
– 23 –
– 24 –
HCD-V818
E
F
A
B
C
D
DRIVE
Q101
LD
RF EQ
AMP
3
5
6
4
SUMMING
AMP
RF
ERROR
AMP
FOCUS
ERROR
AMP
TRACKING
9
8
APC LD
AMP
1
2
19
13
11
10
VC
BUFFER
VC
12
17
REF
SWITCH
Q102,103
CTRL 1
CTRL 2
3
15
RF AMP
IC103
DIGITAL SERVO
DIGITAL SIGNAL PRCESSOR
IC101
IC391
LASER
DIODE
DETECTOR
OPTICAL PICK-UP BLOCK
(KSS-213D/Q-NP)
A
C
D
B
E
F
LD
POWER
PD
LD
PD
LD
A
C
D
B
E
F
TE
FE
RF
ASYMMETRY
CORRECTION
AUTO
SEQUENCER
SERVO
36
INTEG-
RATOR
MUX
38
39
DIGITAL
PLL
EFM
DEMODULATOR
REGISTER
ERROR
CORRECTOR
DATA BUS
32K
RAM
ADDRESS
GENERATOR
D/A DATA
PROCESSOR
DIGITAL
CD DIGITAL
OUT
OPTICAL
OUT
DOUT
PEAK
DETECTOR
PARALLEL
PROCESSOR
SERIAL/
SUBCODE Q
PROCESSOR
SYNC
PROTECTOR
SERVO
INTERFACE
CLV SERVO
PROCESSOR
TIMING
GENERATOR 2
OVERSAMPLING
FILTER
18-TIMES
NOISE
SHAPER
INTEG-
RATOR
28
29
26
27
4
LD ON
A/D
CONVERTER
30
PWM
GENERATOR
TRACKING
PWM
GENERATOR
FOCUS
PWM
GENERATOR
SLED
PWM
GENERATOR
6
8
10
2
100
4
5
19
20
10
9
96
VC
TRACKING
SERVO
FOCUS
SERVO
SLED
SERVO
SERVO DSP
TFDR
TRDR
FFDR
FRDR
SRDR
SFDR
MDP
DETECTOR
77
46
71
D OUT
74
80
78
DATA
SUBQ
SQCK
SCOR
79
MUTE
47
45
S STOP
RFDC
FE
TE
SE
MIRR
FOK
CPU
INTERFACE
86
87
88
DFCT
SENS
DATA
XLT
CLK
CLOCK
GENERATOR
TIMING
GENERATOR 1
62
XTAI
64
XTSL
1
2
16
17
13
12
24
23
27
26
M
M
TRACKING
COIL
FOCUS
COIL
SLED
MOTOR
M102
SPINDLE
MOTOR
M101
T+
T
F+
F
SD+
SD
SP+
SP
FOCUS/TRACKING COIL DRIVE
SPINDLE/SLED MOTOR DRIVE
IC102
VC
TFDR
TRDR
FFDR
FRDR
SRDR
SFDR
15
MUTE
09
56
99
S101
LIMIT SW
C2PO
+5V
83
SCLK
IC104
81
XRST
ADATA
BCLK
LCLK
SUBQ
SQCK
AMUTE
SCOR
SCLK
MCK
SENS
DATA
XLT
CLK
C2PO
CTRL 1
CTRL 2
XRST
LD ON
LCLK
BCLK
70
+5V
MD2
RF AC
ASYI
ASYO
CONTROL SIGNAL
BLOCK
SERVO
BLOCK
VCC
VC
1
VIDEO
SECTION
• SIGNAL PATH
: CD
: Digital out
: VIDEO
(Page 25)
MAIN
SECTION
(Page 29)
M
TABLE
SENSOR
IC702
T. SENS
OPEN
S801
OPEN/CLOSE
DET
OUT1
IN1
IN2
OUT2
M
M701
TURN
TURN
MOTOR
TBL.L
TBL.R
TURN
MOTOR DRIVER
IC701
7
DISC
SENSOR
IC703
ROTARY
ENCODER
S811
Q701
DISC SENS
ENC 1
ENC 2
ENC 3
ENC 2
ENC 3
2
4
7
7
2
10
M801
SLIDE
MOTOR
OUT2
OUT1
RIN
FIN
SLIDE
MOTOR DRIVER
IC801
LOAD IN
LOAD OUT
3
6
A
C
– 25 –
– 26 –
HCD-V818
– VIDEO SECTION –
SYSTEM
SELECT
S501
65
15
13
09
29
I2C.CLK
30
I2C.DATA
I2C.CLK
I2C.DATA
I to U
U to I
TXD
RXD
72
U to I
DSENS
XRESET
NEW
TYPE
(*NOTE)
FORMER TYPE
(*NOTE)
(*NOTE)
TEST LED
NT/PAL
XOUT
+5V
D502
A7
DF LATCH
SHARPNESS
XIN
24
45
BUS
DSP DATA
DSP LATCH
SENSE CLK
DSP CLK
SENSE
DSP MUTE
CTRL1(L:DOUBLE)
CTRL2
LDON
LDON
SCOR
SUBQ DATA
22
34
X501
NTSC
AUTO
PAL
10MHz
X503
27MHz
19
20
X401
8MHz
MECHA CONTROL
IC502
INTERFACE
IC402
INVERTER
IC504
INVERTER
IC501
D-RAM
IC507
ROM
IC506
AMP
IC101
OUTPUT AMP
IC401
VIDEO/CD DECODER
IC505
DIGITAL FILTER & D/A CONVERTER
IC509
DATA1O
DATA1I
CLK1
CL680 INT
CL680 INT
CL680 HSEL
CL680 HRDY
680 RESET
DATA0
DATAI
CLK1
INT
INT
HSEL
HRDY
RESET
ADATA
BCLK
LRCK
C2P0
DATA
XLT
CLK
SENS
SCLK
AMUTE
CTRL1
CTRL2
LDON
SCOR
SUBQ
SQCK
XRST
MCK
A
CD
SECTION
(Page 24)
11
12
10
13
9
G
MAIN
SECTION
• R CH: Same as L ch
• SIGNAL PATH
: CD
: CHROMA
:Y
: VIDEO
• SIGNAL PATH
: CD
: CHROMA
:Y
: VIDEO
SUBQ CLK
DEVICE RESET
(Page 30)
23
19
14
RESET
XIN
XOUT
18
93
73
12
3
4
5
5
1
2
10
11
27
27
28
18
37
36
77
20
21
21
33
32
31
69
HD-OUT
6
CD-C2P0
CD-LRCK
CD-BCK
HRDY
HD-IN
HCK
HINT
HSEL
RESET
PGIO2/VSYNC/CSYNC
INVERTER
Q502
CD-DATA
MWE
WE
RAS
UCAS
LCAS
A0
A8
DQ1
DQ16
RASO
CAS
MCE
MD0
I
MD15
MA0
I
MA10
C-OUT
Y-OUT
75
DA-DATA
DA-BCK 111
VCK-IN 106
DA-XCLK 86
110
DA-LRCK 108
112
119
117
117
113
114
121
93
60
3
5
5
4
13 14 28 29
38 42
40
10
8
4
13
5
1
1
3
8
12
6
11
1
3
7
5
1
3
19
17
DATA0
CLK1
8
7
10
21 20
4
11
18
MODE
PLM
D/A
CONV
CLOCK
DIVIDER
9
24
1
16 - 19 22 - 26
2 - 10 31 - 39
O0
O7
A11
A17
A0
A10
CE
13 - 15 17 - 21
25 4 28 29 3 2 14 10 12 - 5 27 26 23
58 - 44
10 - 29
22
37
MUTE
Q454
BUFFER
Q301
MUTE
Q453
MIX AMP
Q308,310
BUFFER
Q303,304
TRAP
Q302,306,307
1
3
2
4
14
VIDEO OUT
J302
J301
VIDEO
FREQUENCY
CT503
IIC DATA
L - CH
R-CH
IIC CLK
XRST
XRST
27MHz
384FS
768FS
S VIDEO
OUT
OUT
DATAI
DATAO
CLK1
CLK1
HRDY
INT
HSEL
HSEL
RST
* Note
When replacing IC502, refer to “IC502 of
video Board” in “Service Note” (page 13).
When replacing IC502, refer to “IC502 of
video Board” in “Service Note” (page 13).
Click on the first or last page to see other MHC-V818 service manuals if exist.