Sony CMT-VC1 / HCD-VC1 Service Manual ▷ View online
HCD-VC1
11
2-8.
LOADING BOARD
2-9.
CAM (CDM55)
2
belt (CDM55)
B
3
Pull the tray
with pushing
with pushing
B
.
4
two screws
(BTP2.6
(BTP2.6
×
6)
5
LOADING board
1
Rotate the gear(B) in
the direction of arrow
the direction of arrow
A
.
A
2
lever (SW)
1
torsion spring
6
gear (B)
3
spacer (55)
4
pulley (LDG)
5
gear (A)
7
roller
8
cam (CDM55)
HCD-VC1
12
SECTION 3
TEST MODE
Start
REC pause for 3 seconds
FWD REC
Fast forward
REV Play
REC pause for 3 seconds
REV REC
Rewind
FWD Play
Shut off
Shut off
Shut off
Shut off
1 minute
3 minutes
1 minute
3 minutes
Start
Open the disc tray
Close the disc tray
Play the last track
[Cold Reset]
• The cold reset clears all data including preset data stored in the
RAM to initial conditions. Execute this mode when returning
the set to the customer.
the set to the customer.
Procedure:
1. Turn ON the power.
2. Press three buttons
1. Turn ON the power.
2. Press three buttons
x
(TAPE),
x
(CD), and
[TUNER/BAND]
simultaneously.
3. The set is reset.
[Liquid Crystal Display All Lit Check Mode]
Procedure:
1.
1.
Set to standby state.
2.
Press three buttons of
x
(TAPE),
x
(CD), and
[FUNCTION]
simultaneously.
3.
Liquid crystal display are all turned on.
4.
To exit from this mode, press the
I/1
button to turn the power
OFF.
[Tape Deck Aging Mode]
This mode can be used for operation check of tape deck section.
Procedure:
1.
1.
Set a tape in the tape deck.
2.
Set to standby state.
3.
Press three buttons of
x
(TAPE),
x
(CD), and
[+]
(TUNING)
simultaneously.
4.
The aging is executed in bellow sequence.
5.
To exit from the aging mode, press the
I/1
button to turn the
power OFF.
Aging mode sequence:
[CD Aging Mode]
This mode can be used for operation check of CD section.
Procedure:
1.
1.
Load a CD disc.
2.
Set to standby state.
3.
Press three buttons of
x
(TAPE),
x
(CD), and
[--]
(TUNING)
simultaneously.
4.
The aging is executed in bellow sequence.
5.
To exit from the aging mode, press the
I/1
button to turn the
power OFF.
Aging mode sequence:
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 –
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