Sony HCD-M70 Service Manual ▷ View online
HCD-M70
13
13
IC103
TP (RF)
TP (VC)
CD SECTION
Note:
1. CD Block is basically constructed to operate without adjust-
ment.
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 fol-
lowing checks.
lowing checks.
5. Check the focus bias check when optical block is replaced.
Focus Bias Check
Procedure :
1. Connect oscilloscope to TP (RF) and TP (VC) on the CD board.
2. Press the
1. Connect oscilloscope to TP (RF) and TP (VC) on the CD board.
2. Press the
I/1
button to turn the power on, and press
the
Z
CD
button to open the CD disc tray.
3. Put disc (YEDS-18) in and press the
CD
N
button to play-
back.
4. Confirm that oscilloscope waveform is as shown in the figure
below. (eye pattern)
A good eye pattern means that the diamond shape (
A good eye pattern means that the diamond shape (
) in the
center of the waveform can be clearly distinguished.
Checking Location:
– CD BOARD (Conductor Side) –
+
–
–
BD board
TP (RF)
TP (VC)
TP (VC)
oscilloscope
(DC range)
VOLT/DIV: 200 mV
TIME/DIV: 500 ns
TIME/DIV: 500 ns
level:
1.1
1.1
±
0.2 Vp-p
s
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. The adjustments should be performed with the rated power sup-
ply voltage unless otherwise noted.
2. The adjustments should be performed in the order given in this
service manual.
3. The adjustments should be performed for both L-CH and R-
CH.
REC Bias Adjustment
Procedure:
1. Mode: REC
1. Mode: REC
FUNCTION: VIDEO
2. Mode: Playback
3. Confirm playback the signal recorded in step 1 become speci-
fied values as follows.
If these values are out of specification values, adjust the RV101
(L-CH) and RV201 (R-CH) on the TC board to repeat steps
1and 2.
If these values are out of specification values, adjust the RV101
(L-CH) and RV201 (R-CH) on the TC board to repeat steps
1and 2.
Specified values: Playback output of 315 Hz to playback
output of 10 kHz:
± 0.5 dB
Adjustment Location: TC board
attenuator
set
MAIN board
AUDIO IN (MD/VIDEO) jack (SJ302)
L-CH, R-CH
AUDIO IN (MD/VIDEO) jack (SJ302)
L-CH, R-CH
1) 315 Hz
2) 10 kHz
2) 10 kHz
50 mV (– 23.8 dB)
600
Ω
blank tape
CN-123
CN-123
AF OSC
+
–
–
set
recorded
portion
portion
MAIN board
SPEAKER terminals (SJ301)
L-CH, R-CH
SPEAKER terminals (SJ301)
L-CH, R-CH
level meter
SECTION 5
ELECTRICAL ADJUSTMENTS
0 dB=0.775 V
DECK SECTION
RV101 (L)
RV201 (R)
REC Bias
Adjustment
Adjustment
– TC BOARD (Component Side) –
SECTION 4
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 of
1. Turn ON the power.
2. Press three buttons of
x
,
[DSG]
, and
CD
X
simultaneously.
3. The set is reset.
[LIQUID CRYSTAL DISPLAY ALL LIT CHECK
MODE]
MODE]
Procedure:
1. Set to standby state.
2. Press three buttons of
1. Set to standby state.
2. Press three buttons of
x
,
[DSG]
, and
[PLAY MODE/TUNING MODE]
simultaneously.
3. Liquid crystal display are all turned on.
4. To exit from this mode, press the
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. Set a tape in the tape deck.
2. Set to standby state.
3. Press three buttons of
1. Set a tape in the tape deck.
2. Set to standby state.
3. Press three buttons of
x
,
[DSG]
, and
[CD SYNCHRO]
si-
multaneously.
4. The aging is executed in bellow sequence.
5. To exit from the aging mode, press the
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. Load a CD disc.
2. Set to standby state.
3. Press three buttons of
1. Load a CD disc.
2. Set to standby state.
3. Press three buttons of
x
,
[DSG]
, and
[REPEAT/FM MODE]
simul-
taneously.
4. The aging is executed in bellow sequence.
5. To exit from the aging mode, press the
5. To exit from the aging mode, press the
I/1
button to turn the
power OFF.
Aging mode sequence:
[CHANGE-OVER MD/VIDEO]
Procedure:
1. Set to standby state.
2. Press the
1. Set to standby state.
2. Press the
[DSG]
and the
[FUNCTION]
buttons simultaneously.
3. The function change over to MD or VIDEO by turns.
[CHANGE-OVER THE AM TUNING INTERVAL]
(Except AEP and UK models)
(Except AEP and UK models)
• The AM tuning interval can be changed over 9 kHz or 10 kHz.
Procedure:
1. Press the
1. Press the
I/1
button to turn the power ON.
2. Select the function “TUNER”, and press the
[TUNER AM]
button to select the “AM”.
3. Press the
I/1
button to turn the power OFF.
4. Change over to 9 kHz:
Press the
[TUNING --]
and the
[TUNER AM]
buttons simulta-
neously.
Change over to 10 kHz:
Press the
Change over to 10 kHz:
Press the
[TUNING +]
and the
[TUNER AM]
buttons simulta-
neously.
HCD-M70
13
IC103
TP (RF)
TP (VC)
CD SECTION
Note:
1. CD Block is basically constructed to operate without adjust-
ment.
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
1 impedance.
4. Clean the object lens by an applicator with neutral detergent
when the signal level is low than specified value with the fol-
lowing checks.
lowing checks.
5. Check the focus bias check when optical block is replaced.
Focus Bias Check
Procedure :
1. Connect oscilloscope to TP (RF) and TP (VC) on the CD board.
2. Press the
1. Connect oscilloscope to TP (RF) and TP (VC) on the CD board.
2. Press the
I/
1
button to turn the power on, and press
the
Z
CD
button to open the CD disc tray.
3. Put disc (YEDS-18) in and press the
CD
N
button to play-
back.
4. Confirm that oscilloscope waveform is as shown in the figure
below. (eye pattern)
A good eye pattern means that the diamond shape ( ) in the
center of the waveform can be clearly distinguished.
A good eye pattern means that the diamond shape ( ) in the
center of the waveform can be clearly distinguished.
Checking Location:
– CD BOARD (Conductor Side) –
+
–
–
BD board
TP (RF)
TP (VC)
TP (VC)
oscilloscope
(DC range)
VOLT/DIV: 200 mV
TIME/DIV: 500 ns
TIME/DIV: 500 ns
level:
1.1
1.1
±
0.2 Vp-p
s
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. The adjustments should be performed with the rated power sup-
ply voltage unless otherwise noted.
2. The adjustments should be performed in the order given in this
service manual.
3. The adjustments should be performed for both L-CH and R-
CH.
REC Bias Adjustment
Procedure:
1. Mode: REC
1. Mode: REC
FUNCTION: VIDEO
2. Mode: Playback
3. Confirm playback the signal recorded in step 1 become speci-
fied values as follows.
If these values are out of specification values, adjust the RV101
(L-CH) and RV201 (R-CH) on the TC board to repeat steps
1and 2.
If these values are out of specification values, adjust the RV101
(L-CH) and RV201 (R-CH) on the TC board to repeat steps
1and 2.
Specified values: Playback output of 315 Hz to playback
output of 10 kHz:
± 0.5 dB
Adjustment Location: TC board
attenuator
set
MAIN board
AUDIO IN (MD/VIDEO) jack (SJ302)
L-CH, R-CH
AUDIO IN (MD/VIDEO) jack (SJ302)
L-CH, R-CH
1) 315 Hz
2) 10 kHz
2) 10 kHz
50 mV (– 23.8 dB)
¬
®
600
1
blank tape
CN-123
CN-123
AF OSC
+
–
–
set
recorded
portion
portion
MAIN board
SPEAKER terminals (SJ301)
L-CH, R-CH
SPEAKER terminals (SJ301)
L-CH, R-CH
level meter
SECTION 5
ELECTRICAL ADJUSTMENTS
0 dB=0.775 V
DECK SECTION
RV101 (L)
RV201 (R)
¬
«
«
«
«
®
REC Bias
Adjustment
Adjustment
– TC BOARD (Component Side) –
HCD-M70
14
14
I-V AMP
DETECTOR
(TRACKING)
(FOCUS)
2-AXIS DEVICE
LASER DIODE
A
B
C
D
F
E
6
7
8
10
11
4
2
1
5
10
6
7
D+5V
LD
PD
VCC
LD
PD
AUTOMATIC
POWER
CONTROL
Q101
5
RF
SUMMING
AMP
RF EQ
AMP
FOCUS
ERROR AMP
TRACKING
ERROR AMP
FI-V AMP
EI-V AMP
APC LD
AMP
APC PD
AMP
4
PD
16
14
13
22
21
RFO
FE
TE
LD ON
HOLD SW
LD
3
ASYMMETRY
CORRECTION
CORRECTION
EFM
DEMODULATOR
DIGITAL
PLL
51
49
48
RFAC
ASYI
ASYO
54 56 53 55
FILO
PCO
CLTV
FILI
ERROR
CORRECTOR
16k
RAM
INTERNAL BUS
D/A
INTERFACE
SERIAL
IN
INTERFACE
DIGITAL
FILTER
NOISE SHAPER
PWM
&
INTEGRATOR
DIGITAL
OUT
SIGNAL PATH
: CD PLAY (ANALOG)
: CD PLAY (DIGITAL OUT)
60
70
77
D OUT
AOUT1
AOUT2
AIN1
AIN2
51
51
71
76
72
75
LOUT1
LOUT2
BUFFER
CD-L
R-CH
SUBCODE
PROCESSOR
SERVO AUTO
SEQUENCER
CPU INTERFACE
2
5
7
6
20
8
1
14
SQCK
DATA
CLOK
XLAT
SCOR
SENS
SQSO
XLON
TO
MIRR/DFCT/FOK DETECTOR
IC101 (2/2)
9
27
SCLK
SSTP
26
MDP
S101
(LIMIT)
TE
FE
RFDC
SE
41 39 43
40
A/D
CONVERTER
FOCUS/TRACKING/SLED
PWM GENERATOR
FOCUS/TRACKING/SLED
SERVO DSP
MIRR/DFCT/FOK
DETECTOR
23 22
24
DFCT
MIRR
FOK
TO
SERVO
INTERFACE
IC101 (1/2)
IC101 (1/2)
DIGITAL SERVO
PROCESSOR
IC101 (2/2)
14
13
12
11
17
18
15
16
CH1OUTF
CH1OUTR
CH2OUTF
CH2OUTR
CH3OUTF
CH3OUTR
CH4OUTF
CH4OUTR
CH1FIN
CH1RIN
CH2 FIN
CH2RIN
CH3FIN
CH3RIN
2
3
5
6
24
23
MOTOR
DRIVE
MOTOR
DRIVE
COIL
DRIVE
MOTOR
DRIVE
COIL
DRIVE
SPINDLE/SLED MOTOR DRIVE,
FOCUS/TRACKING COIL DRIVE
IC102
M
M
M102
(SLED)
M101
(SPINDLE)
CH4SIN
25
33
32
31
30
28
29
FRDR
FFDR
SFDR
SRDR
TRDR
TFDR
MUTE
20
MUTE
Q801
Q800
SERVO
INTERFACE
DIGITAL
CLV
3
XRST
67
66
XTAL
XTAO
X101
16.9344MHz
TIMING
LOGIC
CLOCK
GENERATOR
OPTICAL
TRANSCEIVER
IC321
OPTICAL
DIGITAL OUT (CD)
CLK, SQSO
CLK
SQSO
A
(Page 16)
B
(Page 15)
CD-ON
C
(Page 16)
RF AMP
FOCUS/TRACKING ERROR AMP
IC103
FILTER
DIGITAL SIGNAL PROCESSOR,
DIGITAL FILTER, D/A CONVERTER
IC101 (1/2)
OPTICAL
PICK-UP BLOCK
(KSS-213DCP)
M
M
Q800, 801
CD ON SWITCH
R-CH : R-ch is omitted due to same as L-ch.
19
11
10
C-LATCH
18 C-SENSE
100 C-SCOR
86 C-RST
C-SQCK
CD-DATA
13 HOLD
SYSTEM CONTROLLER
IC801 (1/3)
SECTION 6
DIAGRAMS
6-1.
BLOCK DIAGRAM – CD SERVO Section –
HCD-M70
15
15
MUTING
CONTROL SWITCH
Q404, 405
11
ALC
CLK
(AEP, UK)
TU1
TUNER UNIT
(EXCEPT AEP, UK)
FM75Ω
ANENNA
AM
4
3
5
9
8
10
7
1
TUNER ON SWITCH
Q804
4
13
14
2
DET AMP
Q302
16
12
2
X301
4.332MHz
RDS DECODER
IC326
D321
D401
(AEP, UK)
17
5
8
31
23
14
30
CAPSTAN/REEL
MOTOR DRIVE
Q341, 343
29
1
6
32
95
94
TRIGGER
PLUNGER DRIVE
Q342, 344
M
M
(TAPE DECK BLOCK)
6
5
10
2
33
M901
(LOADING)
(CAPSTAN/REEL)
OPEN
CLOSE
M
M
LOADING
MOTOR DRIVE
IC320
SIGNAL PATH
: TUNER (FM/AM)
: TAPE PLAY
: REC
FM ANT
ANT GND
ANT GND
AM ANT
L-CH
R-CH
R-CH
TUNED
DI
CK
CE
DO
FM DET
MUX
X1
X0
RDATA
RCLK
INPUT2
INPUT1
OUT2
OUT1
SYSTEM CONTROLLER
IC801 (2/3)
C-SQSO/RDS-DATA
RDS-IN
TUNED
TU-DATA
C-CLK/TU-CLK
TU-CE
TU-COUNT
ALC
21
REC/PB
MOT-CON
SOL-CON
SENSOR
T-MODE
TC-SW
TRAY-OPEN
TRAY-CLOSE
TRAY-SW
S1
DISC TRAY
OPEN/CLOSE DETECT
R-CH : R-ch is omitted due to same as L-ch.
16
REC-MUTE
20
L-MUTE
34
BIN (L)
15
13
14
28
27
EQ-OUT (L)
26
PB-OUT
(L)
TAI (L)
MUTE
REC/PB EQ AMP, ALC
IC401
A/B
MUTE
REC MUTE
24
23
REC-OUT
(L)
(L)
REC-IN
(L)
ALC
(L)
16
R-CH
R-CH
EQ
ALC
BIAS OSC
T401
REC BIAS
SWITCH
Q402, 403
COM +8V
BIAS OSC
Q401
REC BIAS
(L)
MUTING
Q100, 101
RV101
REC BIAS
(R)
RV201
L-CH
R-CH
ERASE
R-CH
HRPE901
(RECORD/PLAYBACK/ERASE)
R-CH
R-CH
T101
BIAS
TRAP
SQSO
D
TU-ON
(Page 16)
B
CLK, SQSO
(Page 14)
E
TU-L
(Page 16)
F
TC-L
(Page 16)
G
REC-L
(Page 16)
FM75Ω
6-2.
BLOCK DIAGRAM – TUNER/TAPE DECK Section –
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