Sony CMT-VC1 / HCD-VC1 Service Manual ▷ View online
HCD-VC1
13
13
2.
Turn the adjustment screw and check output peaks. If the peaks
do not match for L-CH and R-CH, turn the adjustment screw
so that outputs match within 1dB of peak.
do not match for L-CH and R-CH, turn the adjustment screw
so that outputs match within 1dB of peak.
3.
Mode: Playback
4.
Repeat step 1 to 3 in playback (REV) mode.
5.
After the adjustments, apply suitable locking compound to the
pats adjusted.
pats adjusted.
Adjustment Location:
SECTION 4
ELECTRICAL ADJUSTMENTS
0 dB=0.775 V
DECK SECTION
Tape
Signal
Used for
P-4-A100
10 kHz, –10 dB
Azimuth Adjustment
Note:
Confirm each contents of this section first of all. If the results are
not satisfied, do the adjustment.
not satisfied, do the adjustment.
1.
Demagnetize the record/playback head with a head
demagnetizer.
demagnetizer.
2.
Do not use a magnetized screwdriver for the adjustments.
3.
After the adjustments, apply suitable locking compound to the
parts adjust.
parts adjust.
4.
The adjustments should be performed with the rated power
supply voltage unless otherwise noted.
supply voltage unless otherwise noted.
5.
The adjustments should be performed in the order given in this
service manual. (As a general rule, playback circuit adjustment
should be completed before performing recording circuit
adjustment.)
service manual. (As a general rule, playback circuit adjustment
should be completed before performing recording circuit
adjustment.)
6.
The adjustments should be performed for both L-CH and R-
CH.
CH.
7.
Switches and controls should be set as follows unless otherwise
specified.
specified.
• Test Tape
Record/Playback Head Azimuth Adjustment
Procedure:
1.
1.
Mode: Playback
set
MAIN board
SPEAKER terminals (SJ301)
L-CH, R-CH
SPEAKER terminals (SJ301)
L-CH, R-CH
+
–
–
level meter
test tape
P-4-A100
(10 kHz, –10 dB)
P-4-A100
(10 kHz, –10 dB)
Screw
position
position
L-CH
peak
peak
within
1 dB
1 dB
Output
level
level
L-CH
peak
peak
R-CH
peak
peak
within
1 dB
1 dB
Screw
position
position
R-CH
peak
peak
set
test tape
P-4-A100
(10 kHz, –10 dB)
P-4-A100
(10 kHz, –10 dB)
R-CH
oscilloscope
V
H
waveform of oscilloscope
in phase 45
°
90
°
135
°
180
°
good
wrong
MAIN board
SPEAKER terminals (SJ301)
L-CH
SPEAKER terminals (SJ301)
L-CH
forward
reverse
CD SECTION
Notes:
1. CD block basically constructed to operate without adjustment. There-
fore, check each item in order given.
2. Use YEDS-18 disc (Part No.: 3-702-101-01) unless otherwise indicated.
3. Use the oscilloscope with more than 10 M
3. Use the oscilloscope with more than 10 M
Ω
impedance.
4. Clean an object lens by an applicator with neutral detergent when the
signal level is low than specified value with the following checks.
S-Curve Confirmation
Connection:
Procedure:
1. Connect an oscilloscope to IC703 pin qg and TP (VC) on the
1. Connect an oscilloscope to IC703 pin qg and TP (VC) on the
CD board.
2. Connect between TP (FOK) and TP (GND) on the CD board
by lead wire.
3. Turn the power ON.
4. Press the
4. Press the
[EJECT ]
(CD) button to open the disc tray, and
put the disc (YEDS-18).
5. Press the
[EJECT ]
(CD) button to close the disc tray (Actu-
ate the focus search).
6. Confirm that the waveform on the oscilloscope is symmetrical
between A and B and that peak to peak level is within 3.0
±
1.0 Vp-p.
S-curve waveform
7. After confirmation, disconnect the lead wire in step 2.
Note:
• Try to measure several times to make sure that 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.
RF Level Confirmation
Connection:
Procedure:
1. Connect an oscilloscope to IC703 pin qh and TP (VC) on the
1. Connect an oscilloscope to IC703 pin qh and TP (VC) on the
CD board.
2. Turn the power ON.
3. Load the disc (YEDS-18), and press the
3. Load the disc (YEDS-18), and press the
[ ]
button to play-
back the disc.
4. Confirm that the waveform on the oscilloscope is clear and
that the RF signal level is correct.
Note:
Clear RF signal waveform means that the shape “
◊
” can be clearly
distinguished at the center of the waveform.
+
–
–
CD board
IC703 pin qg
TP (VC)
oscilloscope
+
–
–
CD board
IC703 pin qh
TP (VC)
oscilloscope
(AC range)
RF signal waveform
When observing the eye pattern, set the oscilloscope for AC range
and raise vertical sensitivity.
and raise vertical sensitivity.
Connecting Location:
– CD Board (Conductor Side) –
VOLT/DIV: 200 mV
TIME/DIV: 500 ns
(with the 10: 1 probe
in use)
TIME/DIV: 500 ns
(with the 10: 1 probe
in use)
level: 1.3 Vp-p
+0.25
–0.20
Z
within 3.0
±
1.0 Vp-p
A
B
symmetry
TP (GND)
TP (VC)
TP (FOK)
20
11
1
10
CN701
IC701
IC703
u
Z
HCD-VC1
14
14
VCD BLOCK
A/D
CONVERTER
OUT+
OUT–
3
4
7
2
1
5
10
6
4
5
6
16
15
14
13
8
9
19
2
1
77
78
71
55
54
45
47
46
63
20
31
33
34
32
36
38
39
26
93
27
28
29
80
88
89
100
2
4
6
8
10
20
19
10
9
4
5
16
17
27
26
23, 24
E
B
C
D
A
A+5V
F
DETECTOR
A
B
C
D
RF
SUMMING
AMP
FOCUS
ERROR AMP
RF EQ
SWITCH
Q702
RF EQ
AMP
TRACKING
ERROR AMP
RFO
17
RFE
FE
FE BIAS
RF AMP,
FOCUS/TRACKING ERROR AMP
IC703
TE
E
F
F I-V AMP
E I-V AMP
AUTOMATIC
POWER
CONTROL
Q701
OPTICAL
TRANSCEIVER
IC321
OPTICAL
DIGITAL OUT (CD)
APC LD
AMP
APC PD
AMP
LD
LD
PD
LASER DIODE
RFAC
MIX
ASYO
ASYI
FILTER
FILO
PCO
CLTV
FILI
DIGITAL PLL
ASYMMETRY
CORRECTOR
EFM
DEMODULATOR
REGISTER
DIGITAL SIGNAL PROCESSOR
IC701 (1/2)
MON
MDP
MDS
94 95 96 97
FSW
CLV
PROCESSOR
18-TIMES
OVERSAMPLING
FILTER
NOISE
SHAPER
INTERNAL BUS
32K
RAM
ERROR
CORRECTOR
SUBQ
SQCK
83
SCLK
79
MUTE
76
EXCK
SUBCODE Q
PROCESSOR
SUBCODE P – W
PROCESSOR
SYNC
PROTECTOR
TIMING
GENERATOR 1
TIMING
GENERATOR 2
DATA
VCKI
XTAO
62
XTAI
BCLK
LRCK
LRCK
RFCK
GFS
56
C2PO
DOUT
DIGITAL
OUT
SERIAL/PARALLEL
PROCESSOR
D/A DIGITAL
PROCESSOR
CLOCK
GENERATOR
ADDRESS
GENERATOR
PRIORITY
ENCODER
ENCODER
PEAK
DETECTOR
74
SCOR
81
73
WFCK
75
SBSO
SE
TE
FE
RFDC
FOCUS/TRACKING/SLED
SERVO DSP
FOCUS/TRACKING/SLED
PWM GENERATOR
SFDR
IN+
IN–
OUT+
OUT–
IN–
IN+
IN–
IN+
15
MUTE
SRDR
TFDR
TRDR
FFDR
FRDR
COUT
MIRR/DFCT/
FOK
DETECTOR
SERVO AUTO
SEQUENCER
SERVO
INTERFACE
CPU
INTERFACE
CLOK
86
DATA
87
XLAT
SENS
FOK
91
92
MIRR
DFCT
IN+, IN–
OUT+
OUT–
M101
(SPINDLE)
MOTOR
DRIVE
LDON
MUTE
MOTOR
DRIVE
COIL
DRIVE
OUT–
OUT+
COIL
DRIVE
M
M
M102
(SLED)
FOCUS/TRACKING COIL DRIVE,
SPINDLE/SLED MOTOR DRIVE
IC702
2-AXIS
DEVICE
(TRACKING)
(FOCUS)
DIGITAL SERVO
PROCESSOR
IC701 (2/2)
OPTICAL PICK-UP
(KSS-213DCP)
LDON
PD
I-V AMP
12
13
2
1
SUBQ
SQCK/SCLK
SCOR
VARI-PITCH
DOUBLE SPEED
IC704
D+5V
S901
DISC TRAY
OPEN/CLOSE DETECT
INPUT1
TR-CLOSE
OUT1
LOADING
MOTOR DRIVE
IC320
SW-CLOSE
SW-OPEN
5
2
INPUT2
TR-OPEN
OUT2
6
10
M
M901
(LOADING)
FOK
SENS
DATA
CLK
XTL
XRST
XRST
PAL
AUTO
NTSC
SW401
SYSTEM SELECT
CTRL2
XTAL 16.9344MHz
AD
BCK
LRCK
C2PO
DO
DO
VIDEO OUT
J401
VIDEO OUT
A +5V
S101
(LIMIT)
LIMIT
GFS
VIDEO SYSTEM
A
(Page 15)
CD L-CH
L-OUT
R-OUT
R-CH
S-REQ
S-CLK
S-ACK
RST
S-SD
S-SI
E
(Page 15)
• SIGNAL PATH
: CD PLAY (ANALOG OUT)
• R-CH : R-ch is omitted due to same as L-ch.
: CD PLAY (DIGITAL OUT)
: CD PLAY (VIDEO)
SECTION 5
DIAGRAMS
5-1.
BLOCK DIAGRAM – CD SERVO Section –
HCD-VC1
15
15
5-2.
BLOCK DIAGRAM – MAIN Section –
TU1
TUNER PACK
L
R
1
2
4
9
8
10
7
31
30
17
3
LINE
OUT2
VOL2
OUT2
TREBLE
LOGIC
MIDDLE
BASS
INPUT SELECT SWITCH,
MIX, TONE CONTROL,
ELECTRICAL VOLUME
ELECTRICAL VOLUME
IC323
12
13
2
14
15
88
23
5
8
19
18
25
AUDIO IN
MD (VIDEO)
SJ302
HRPE901
(RECORD/PLAYBACK/ERASE)
R-CH
(ERASE)
R-CH
L-CH
1
3
2
REC/PB SWITCHING
IC402
REC/PB AMP, EQ AMP
IC401
(REC)
(PB)
(SW)
R-CH
R-CH
4
23
24
20
R-CH
R-CH
ALC
16
14
REC OUT L
PB L
REC
IN L
IN L
B+
(+8V)
BIAS
OSC
T401
REC BIAS SWITCH
Q402, 403
BIAS OSC
Q401
BIAS
TRAP
TRAP
T403
CD L-CH
S-ACK
S-REQ
S-DO
S-DI
S-CLK
S-RST
S-CLK
S-RST
DATA
CLK
SDA
(SCK)
95
11 17 14 100
E
(Page 14)
MUTING
Q200
R-CH
B+ (+8V)
MUTING DRIVE
Q330
4
10
9
14
+
+
–
–
SJ301
L
R
SPEAKER
IMPEADANCE
USE 6 – 16
Ω
R-CH
R-CH
J301
HEADPHONE AMP
IC324
MUTING
Q815, 817
MUTING DRIVE
Q312, 313
MOS GAIN &
LEVEL SHIFT
LEVEL SHIFT
ING STAGE
MOS
OUTPUT
STAGE
SHORT
CIRCUIT
PROTECTION
TUNER
D856, 857
IN+
IN–
STANDBY/MUTE
MUTE
STBY
B
(Page 16)
REG CON
D
(Page 16)
REC/PB
POWER AMP
IC201
R-CH
97
22
24
93
92
X802
32.768KHz
32.768KHz
39
4
40
X801
4.19MHz
CAPSTAN/REEL
MOTOR DRIVE
Q601, 602
10
1
6
32
TRIGGER
PLUNGER DRIVE
Q603, 604
M
M
TAPE END DETECT
SENSOR
(TAPE DECK BLOCK)
• SIGNAL PATH
: TUNER
: CD PLAY (ANALOG OUT)
: CD PLAY (OPTICAL OUT)
: TAPE (PLAY)
: TAPE (RECORD)
: MD
OUT
FM ANT
ANT GND
ANT GND
AM ANT
L-CH
R-CH
R-CH
TUNED
DI
CK
CE
DO
R-CH
B IN L
A IN L
6
3
8
10
SYSTEM CONTROLLER
IC801 (1/2)
C2
B1
D2
E2
(S-SI)
(S SO)
TUNED
(TU-DATA)
(TU-CLK)
(TU-CE)
(TU-COUNT)
TU ON
REC/PB
(S-CLK)
(MPEG-RST)
(S-REQ)
(S-ACK)
AU-MUTE
AMP-MUTE
(MIC CHECK)
TEX
TX
EXTAL1
MOT-CON
XTAL1
SOL-CON
TAPE-END
T-MODE
TC SW
PHONES
• R-CH : R-ch is omitted due to same as L-ch.
A
(Page 14)
96
87
L-MUTE
REC-MUTE
MUTING
Q407
MUTING
Q414
R-CH
R-CH
LINE
AMP
AMP
MIC AMP
11
R-CH
D401
R-CH
R-CH
LED DRIVE
Q854
FM
75
Ω
AM
ANTENNA
HCD-VC1
16
16
5-3.
BLOCK DIAGRAM – DISPLAY/POWER SUPPLY Section –
ROTARY
ENCODER
RV801
VOLUME
RV801
JOG-A
JOG-B
21
20
36 – 34
KEY1 – 3
S801 – 820
50 – 53
COM0 – 3
LIQUID CRYSTAL
DISPLAY
LCD801
54 – 85
SEG0 – 31
REMOCON
3
REMOTE CONTROL
RECEIVER
IC802
LED DRIVE
Q855
DSG
D854
CD SYNC
D856
LED DRIVE
Q856
CD-SYNC
26
27
89
38
99
VDD
RESET
WP
RESET SIGNAL
GENERATOR
IC803
+5V
(ROTARY ENCODER)
D812
D811
B+ SWITCH
Q606, 607
Q605
B+ SWITCH
Q608, 609
CASSETTE HOLDER
BACK LIGHT
D802
D
REC/PB
(Page 15)
SYSTEM CONTROLLER
IC801 (2/2)
LED DRIVE
Q853
TAPE
D855
TC-ON 98
94
CD-ON
LED DRIVE
Q852
CD
D852
CD +5V
REGULATOR
Q306
B+
(CD +5V)
+10V
REGULATOR
Q305
CD +8V
REGULATOR
IC306
B+
(CD +8V)
B+
(FM +7.5V)
+9V
REGULATOR
Q301
FM +7.5V
REGULATOR
Q302
B+
(+9.5V)
B+
(COM +12V)
7
REG-CON
RECT
D906 – 909
RECT
D902 – 905
COM +8V
REGULATOR
IC304
COM +12V
REGULATOR
Q355
B+
(COM +8V)
LED B+
SWITCH
Q661, 662
LED B+
(+8V)
T902
MAIN
TRANSFORMER
RELAY
DRIVE
Q902
B+
(+14V)
B –
( – 14V)
B+
(+22.5V)
B –
( – 22.5V)
POWER AMP
(IC101, 201)
COM – 8V
REGULATOR
IC302
B –
( COM – 8V)
REG CON
C
(Page 15)
B
RY901
A
D917
D310
B+ SWITCH
Q608, 609
B+ SWITCH
Q901
RECT
D910 – 913
RELAY +5V
REGULATOR
IC301
T901
SUB
TRANSFORMER
WAKE UP
SWITCH
Q890, 891
D801
D S G
D866 – 869
(LCD BACK LIGHT)
37
SIMUKE/TEST
REGULATOR
CONTROL
SWITCH
Q303, 304
REGULATOR
CONTROL
SWITCH
Q307, 308
B+
(+5V, RELAY +5V)
230V
115V
COM
230V
115V
COM
F905
-2
-1
VOLTAGE
SELECTOR
S901
220 – 240V
110 – 120V
15
(PCB-LED)
LED DRIVE
Q856
LED DRIVE
Q859
PBC
D860
31
(FM-ON)
F902
F901
(EXCEPT TH)
(EXCEPT TH)
(TH)
(EXCEPT TH)
(EXCEPT TH)
(TH)
(TH)
LF901
• Abbreviation
TH : Thailand model
TH : Thailand model
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