DOWNLOAD Sony MHC-VX888 (serv.man2) Service Manual ↓ Size: 12.49 MB | Pages: 83 in PDF or view online for FREE

Model
MHC-VX888 (serv.man2)
Pages
83
Size
12.49 MB
Type
PDF
Document
Service Manual
Brand
Device
Audio
File
mhc-vx888-sm2.pdf
Date

Sony MHC-VX888 (serv.man2) Service Manual ▷ View online

21
HCD-VX888
Note:
Clear RF signal waveform means that the shape “
” can be
clearly distinguished at the center of the waveform.
RF signal waveform
E-F Balance (1 Track jump) Check
Procedure:
1.
Connect an oscilloscope to TP (TEO) and TP (DVC).
2.
Turned Power switch on.
3.
Load a disc (YEDS-18) and playback the number five track.
4.
Press the  u  button. (Becomes the 1track jump mode.)
5.
Confirm that the level B and A (DC voltage) on the oscilloscope
waveform.
1 track jump waveform
Specification level:      
x
 100=less than 
±
22%
6.
After check, remove the lead wire connected in step 1.
RF PLL Free-run Frequency
Procedure :
1.
Connect frequency counter to test point (XPCK) with lead wire.
2.
Turned Power switch on.
3.
Put the disc (YEDS-18) in to play the number five track.
Confirm that reading on frequency counter is 4.3218MHz.
oscilloscope
BD board
TP (TEO)
TP (DVC)
+
A
B
+
frequency counter
BD board
TP (XPCK)
Adjustment Location :
[ BD BOARD ] — SIDE B —
IC103
IC101
TP
(RFDC)
TP 
(FEO)
TP (TEO)
TP 
(DVC)
TP
(RFAC)
17
TP
(VC)
TP
(XPCK)
TP
(FEI)
VOLT/DIV : 200mV
TIME/DIV : 500ns
level : 1.1 
±
 0.3Vp-p 
0V
Center of
waveform
B
Symmetry
A (DC voltage)
level=1.3 
±
0.6Vp-p
22
HCD-VX888
VIDEO SECTION
Frequency Adjustment
Connection:
Procedure:
1. Connect the frequency counter to check point of the VIDEO
board.
2. Turned power switch on.
3. Press the  CD  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 A)
J301
CN501
CN503
CN502
IC507
(GND)
(27MHz)
CT503
VIDEO
Frequency
Adjustment
VIDEO board
(27 MHz)
frequency counter
HCD-VX888
23
23
SECTION  6
DIAGRAMS
6-1.
BLOCK  DIAGRAM  – TUNER/CD Section –
A
MAIN
SECTION
(Page 24)
B
VIDEO CD
SECTION
(Page 25)
VIDEO CD
SECTION
(Page 25)
C
D
DISPLAY/POWER
SECTION
(Page 26)
IC501
IC106
: FM
: CD
• Signal Path
• R-CH is omitted due to same as L-CH. 
: DIGITAL OUT
FM 75
G
AM
TM1
ANT IN
1
7
IF OUT
8
OSC OUT
5
VT
FE1
+B
(+11.7V)
A+12V
Q2
FM
10
FM OSC
16
A IN
19
A OUT
20
PD
18
PLL
IC51
7
FM
15
AM OSC
9
VCO STOP
8
IF REQ
6
DO
4
DI
5
CL
3
CE
XIN
1
XOUT
22
X51
4.5MHz
RF IF
AMP
Q1
CF1
CF2
DO
DI
CL
CE
2
1
11
9
3
10
7
8
RB41
2
AM MIX OUT
AM/IF
11
AM OSC
24
VCO STOP
12
IF REQ MUTING
10
AM RF IN
21
AM OSC
23
VCC
23
FM IF
1
AM/FM IF MPX
IC11
13
L OUT
14
R OUT
BUFFER
Q11
LPF11
LPF
4
AM IF IN
IFT11
R-CH
6
TUNED
7
STEREO
ST MUTING
21
ST CE
22
ST CLK
27
ST DOUT
23
ST DIN
25
STEREO
2
TUNED
3
SYSTEM CONTROLLER
IC501 (1/3)
DO
CL
CE
DI
DI
OUT
CD
DIGITAL OUT
IC201
L-CH
TBL ADDRESS
SENSOR
49
T SENS
IC711
48
BU UP/DOWN SW
46
OPEN SW
47
CLOSE SW
44
LOAD IN
OPEN/CLOSE
S701
BU UP/
DOWN
S711
45
LOAD OUT
MOTOR
DRIVE
9
7
4
2
M
IC701
TURN
MOTOR
M721
30
I2C.DATA
IIC DATA
29
I2C.CLK
IIC CLK
6
12
IF IN
RV11
+B (+7.4V)
AFC
22
DIGITAL
OPTICAL
OPTICAL PICK-UP
BLOCK
(A-MAX.3)
PD1
PD2
I5-10
I1-6
LD
VC
SW
VCC
+5V
GND
 LD GND
PD
LD
DRIVE
Q101
RF AMP
IC103
VC
27
VFC
25
A
6
B
7
C
8
D
9
E
10
F
11
LD
1
PD
2
MOTOR/COIL DRIVE
IC102
VO1(-)
52
VO1(+)
47
56
55
1
2
M
M102
SLED
MOTOR
5
10
M
M101
SPINDLE
MOTOR
F+
F-
T+
T-
35
IN1+
34
IN1-
32
31
27
26
24
MDP
25
SRDR
30
SFDR
29
TRDR
32
TFDR
31
FRDR
34
FFDR
33
DIGITAL SIGNAL PROC.
DIGITAL SERVO
IC101
64
D OUT
RFAC
50
VC
38
CE
42                
28
RFDC
15
14
RFAC
16
FE
18
TE
12
SW
17
FEI
29
RFDCI
RFDC
43
FE
39
TE
41
SE
40
4
DATA
DATA
CD DATA
CD BCK
CD LRCK
C2PO
MCLK
6
CLOK
CLK
5
XLAT
XLT
76
SQSO
SQSO
7
SENS
SENS
26 SSTP
2
XRST
8
STBY
69
XTSL
VIDEO CD CONTROL
IC502 (1/2)
DSP DATA
95
8
SCLK
SCLK
15
SCOR
SCOR
DSP CLK
5
DSP LATCH
97
SUBQ DATA
84
SENSE
1
SENSE CLK
2
SCOR
18
CTRL1
CTRL1(1-2)
11
3
MUTING
MUTING
DSP MUTING
10
66
PCMD
67
BCLK
65
LRCK
14
C2PO
71
XTAI
77
SQCK
SQCK
SUBQ CLK
83
LD ON
LDON
82
DEVICE RESET
XRST
77
PWM1 (BD)
PWM1
28
PWM2 (BD)
PWM2
26
PWM3 (BD)
PWM3
24
VO2(-)
VO2(+)
VO3(+)
VO3(-)
VO4(+)
VO4(-)
IN2+
IN2-
IN3+
IN3-
IN4R
DVC
+3.3V
REG.
Q103,D101
+5V
+3.3V
1
2
3
4
13
12
11
10
5
6
9
8
4
2
HCD-VX888
24
24
6-2.
BLOCK  DIAGRAM  – MAIN Section –
+
+
+
POWER
AMP
IC501
Q503
10
12
18
DBFB
CONT
Q101, 102
MUTING
CONT
Q504, 505
IC102
6
7
5
MUTING
Q103
MUTING
CONT
Q861
Q821, 822
R-CH
MUTING
Q862
R-CH
DBFB
SWITCH
MUTING
CONT
Q503, 504
MUTING
Q581
PROTECT
DETECTOR
Q551
OVER LOAD
DETECTOR
Q823
D502
PROTECT
CONT
Q828, 829
PROTECT
SWITCH
Q891, 892
M961
(FAN)
DISPLAY/POWER
SECTION
(Page 26)
HEADPHONE
SW
MOTOR B+
MIC SIG
SPEANA
R-CH
PROTECT
FAN
DRIVE
Q824, 825
RY801
R-CH
RELAY
DRIVE
R-CH
TH701
+B
(+30V)
R-CH
R-CH
+
Q505, 506
OVER HEAT
DETECTOR
D841
Q831
FAN ON
SWITCH
79
21
24
40
22
82 83
87
88
95
94
97
75
5
6
7
78
74
8
4
1
2
3
7
5
12
CN101
TO
SATELLITE
AMPLIFER
(TA-DX80)
L-IN
LINE-MUTE
STK-MUTE
PROTECT
RELAY-ON/OFF
CONT-A
CONT-B
BOOSTER SW
STAND-BY LED
H
DISPLAY/POWER
SECTION
(Page 26)
J
DISPLAY/POWER
SECTION
(Page 26)
K
DISPLAY/POWER
SECTION
(Page 26)
I
85
RELAY
DRIVE
Q831, 832
80
81
DBFB
ON/OFF
LINE MUTE
STK MUTE
FRONT MUTE
PROTECT
REAR
RELAY
GEQ
DATA
GEQ
CLK
CONT-A
CONT-B
BOOSTER SW
STAND-BY LED
D794
LED
DRIVE
Q794
I/1
S796
I/1
S752
S1001
(A  PLAY)
S1002
(B  PLAY)
S1003
(A  HALF)
DISPLAY
73
56
89
57
70
S1006
(B  HALF)
91
S1005
(REC  A)
S1009
(REC  B)
(DECK-A)
REEL DET
IC1001
RV1002
Q395
NORM SPEED
RV1001
M901
CAPSTAN
MOTOR
A
B
+
HIGH SPEED
90
51
(DECK-B)
REEL DET
IC1002
51
A TRG M+
A TRIG. DRIVE
Q393, 394
52
B TRG M+
B TRIG. DRIVE
Q391, 392
DOLBY
B
DOL
PB
PAS
REC
PB
70
120
A
5
7
B
IC701
3
1
CAP MOTOR
SPEED CONT
Q1001
MOTOR
CONT
M
M
52
69
SYSTEM CONTROLLER
IC501 (2/3)
PB
LEVEL (A)
RV302
DECK-A
HP901
PB
HEAD
PB EQ
AMP
IC303
5
7
PB EQ
AMP
IC304
PB
LEVEL (B)
RV303
DECK-B
HRPE901
REC/PB
HEAD
ERASE
HEAD
R-CH
R-CH
R-CH
R-CH
1
2
3
4
REC/PB SWITCH
IC302
SWITCH
Q304, 305
C332, L301
BIAS
TRAP
REC
EQ
BIAS
SW
RV304
T301
Q301
REC
BIAS
BIAS
OSC
Q302, 303
GRAPHIC EQUALIZER CONTROL,
ELECTRICAL VOLUME
IC101
SUR1
SUR2
SUR3
GAME/VIDEO
1 AUDIO OUT ON/OFF
AMS IN
TC MUTE
REC/PB/PASS
NR ON/OFF
REC MUTE
BIAS
ALC
EQ H/N
PB A/B
A TRIG
B TRIG
TC RELAY
40
48
46
36
38
17 19
39
26
25
24
23
22
20
15
18
16
53
58
59
60
61
65
68
66
67
43
Q141
B+
(TCA+6V)
B+
(TC+12V)
A+12V
DC
BIAS
32
33
BP/SR
IC104
1
3
2
CONT2
CONT3
CROM
NORM
PB AMP, REC EQ AMP,
DOLBY B NR
IC301
REC
LEVEL (L)
RV301
A120/70
B NORM/CROM/METAL
S1004
(A. 120/70) 
S1008
(A. 120/70) 
39
35
A
38
E
G
L
37
13
12
11
9 10
INPUT SELECT
IC105
R-CH
L-CH
L-CH
LOUT
TUNER/CD SECTION
(Page 23)
VIDEO CD SECTION
(Page 25)
VIDEO/CD SECTION
(Page 25)
J101
L
R
J402
L
R
J601
J401
L
R
VIDEO
VIDEO OUT
AUDIO OUT
CONTROL
GAME INPUT
AUDIO
MD/VIDEO
(AUDIO)
R-CH
R-CH
3
1
2
7
3
9
10
1
VIDEO SWITCH
IC781
AUDIO SWITCH
IC401
SWITCH
CONTROL
Q401
SURROUND
SWITCH
SURROUND SWITCH
IC103
VIDEO
SWITCH
DISPLAY/POWER
SECTION
(Page 26)
34
10
7
3
2
1
CONT3
CONT2
BP/SR
REC
A
B
Q104
VIN2
VIN1
SW1
V OUT
MS OUT
LM ON/OFF
REC/PB/PASS
NR ON/OFF
RM ON/OFF
BIAS ON/OFF
ALC ON/OFF
NORM/HIGH
PB A/B
FREQ A
FREQ B
BOOSTER SW
STBY LED
POWER KEY
DISPLAY KEY
A PLAY
A SHUT
B PLAY
A HALF
B HALF
B SHUT
A TRIG
B TRIG
IN 2A
IN 2C
IN 2D
VSELA
IN2
DATA
VOL OUT2
CLOCK
IN 2B
INVOL OUT2
+
Q396, 397
CAP MOTOR
DRIVE
PHONES
SPEAKER
TM801
J631
L
R
IMPEDANCE
USE 6-16
• SIGNAL PATH
: PB (DECK A)
: PB (DECK B)
: REC (DECK B)
: FM
: CD
: VIDEO
• R-ch is omitted due to same as L-ch.
6
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