HCD-GX8000, HCD-RG77 - Sony Audio Service Manual (repair manual). Page 21

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21
HCD-GX8000/RG77
CD SECTION
Note:
1.
CD Block is basically designed to operate without adjustment. Therefore,
check each item in order given.
2.
Use LUV-P01 (4-999-032-01) unless otherwise indicated.
3.
Use an oscilloscope with more than 10M
 impedance.
4.
Clean the object lens by an applicator with neutral detergent when the
signal level is low than specified value with the following checks.
S-CURVE  CHECK
Procedure :
1. Connect an oscilloscope to TP (FEO).
2. Connect between TP (FEI) and TP (DVC) ( 1.65 V) by lead
wire.
3. Turn the power ON.
4. Load a disc (LUV-P01) and actuate the focus search. (In
consequence of open and close the disc tray, actuate the focus
search)
5. Confirm that the oscilloscope waveform (S-curve) is
symmetrical between A and B. And confirm peak to peak level
within 2 
±
 0.5 Vp-p.
6. After check, remove the lead wire connected in step 2.
Note:
• Try to measure several times to make sure than 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  CHECK
Procedure :
1. Connect an oscilloscope CH1 to TP (RFDC) and CH2 to TP
(RFAC).
2. Turn the power ON.
3. Load a disc (LUV-P01) and playback.
4. Confirm that oscilloscope waveform is clear and check if RF
signal level is correct or not.
BD board
Oscilloscope
TP(FEO)
TP(DVC)
symmetry
S-curve waveform
within 2 
±
0.5Vp-p
A
B
TP(RFDC)
TP(RFAC)
BD board
oscilloscope
TP(DVC)
Note:
Clear RF signal waveform means that the shape “ 
 ” can be clearly
distinguished at the center of the waveform.
E-F BALANCE (1  TRACK  JUMP)  ADJUSTMENT
Procedure :
1. Connect an oscilloscope to TP (TEO) and TP (DVC).
2. Turn the power ON.
3. Load a disc (LUV-P01) and playback the number nine track.
4. Press the hH button. (Becomes the 1 track jump mode.)
5. Confirm that the level B and A (DC voltage) on the oscilloscope
waveform.
6. Adjust RV101 on the BD board so that the center of waveform
becomes the same voltage of DVC. (i.e.  A=0V)
Connecting and Adjustment Location: BD board
RF signal waveform
VOLT/DIV : 200mV
TIME/DIV : 500ns
level : 0.65 
±
0.15Vp-p (RFDC)
1.1 
±
0.4Vp-p (RFAC)
TP(TEO)
TP(DVC)
BD board
oscilloscope
level=1.0 
±
0.5Vp-p
symmetry
A (DC voltage)
center of
waveform
B
DVC
1 track jump waveform
22
HCD-GX8000/RG77
Connecting and Adjustment Location:
– BD BOARD (Component Side) –
TP
(DVC)
TP
(FEO)
TP
(FEI)
TP
(RFDC)
TP
(RFAC)
TP
(TEO)
– BD BOARD (Conductor Side) –
RV101
E-F BALANCE
(1 TRACK JUMP)
ADJUSTMENT
HCD-GX8000/RG77
23
23
SQSO
SQCK
A/D
CONVERTER
CH1OUTR
CH1OUTF
6
7
8
9
16
18
11
10
12
2
1
51
49
48
43
24
41
40
39
64 15
28
29
30
31
32
33
24
25
23
6
5
3
2
17
18
15
16
CD A+5V
DETECTOR
A
B
C
D
RF
SUMMING
AMP
FOCUS
ERROR AMP
TRACKING
ERROR AMP
RFAC
FE
RF AMP,
FOCUS/TRACKING ERROR AMP
IC103
TE
E
F
F I-V AMP
E I-V AMP
AUTOMATIC
POWER
CONTROL
Q101
APC LD
AMP
LD
LD
PD
LASER DIODE
RFAC
ASYO
ASYI
ASYMMETRY
CORRECTION
DIGITAL
PLL
DIGITAL SIGNAL PROCESSOR,
DIGITAL FILTER, D/A CONVERTER
IC101 (1/2)
DATA
XLAT
CLOK
14
5
6
MDP
26
7
8
XLON
3
XRST
DIGITAL
CLV
D/A
INTERFACE
SE
TE
FE
RFDC
FOCUS/TRACKING/SLED
SERVO DSP
FOCUS/TRACKING/SLED
PWM GENERATOR
SFDR
CH3FIN
CH4SIN
CH3RIN
CH3OUTF
CH3OUTR
CH2RIN
CH2FIN
CH1RIN
CH1FIN
20
MUTE
SRDR
TFDR
TRDR
FFDR
FRDR
EMPH
WFCK
GFS
MIRR/DFCT/
FOK
DETECTOR
SERVO AUTO
SEQUENCER
SERVO
INTERFACE
CPU INTERFACE
18
63
62
61
19
SENS
20
36
37
35
34 19
SCOR
SQ-DATA-IN
SQ-CLK
XLT
CD-CLK
CD-DATA
SENS
SCOR
1 2
32 33
SCLK
COUT
9 21
SSTP
27
FOK
22
23
MIRR
DFCT
TO SERVO INTERFACE
CH4OUTF
CH4OUTR
M101
(SPINDLE)
MOTOR
DRIVE
MOTOR
DRIVE
CH2OUTR
CH2OUTF
M
M
M102
(SLED)
FOCUS/TRACKING COIL DRIVE,
SPINDLE/SLED MOTOR DRIVE
IC102
2-AXIS
DEVICE
(TRACKING)
(FOCUS)
DIGITAL SERVO
PROCESSOR
IC101 (2/2)
OPTICAL PICK-UP
BLOCK
(A-MAX. 3)
SW
PD
11
12
14
13
54
56 53
55
FILTER
FILO
PCO
CLTV
FILI
EFM
DEMODULATOR
SERIAL
IN
INTERFACE
DIGITAL
FILTER,
NOISE SHAPER
PWM
&
INTEGRATOR
BUFFER
CLOCK
GENERATOR
TIMING
LOGIC
DIGITAL
OUT
INTERNAL BUS
16K
RAM
ERROR
CORRECTOR
SUBCODE
PROCESSOR
60
43
XRST
AIN1
AIN2
AOUT1
AOUT2
TO MIRR/DFCT/
FOK DETECTOR
PCMD
BCK
LRCK
C2PO
DOUT
70
77
LOUT1
LOUT2
R-CH
72
75
71
76
A
(Page 25)
EQ
IN
15
3
4
EQ
AC
SUM
17
FEI
RF DC
AMP
28
RFDCO
29
RFDCI
19
TE BAL
COIL
DRIVE
COIL
DRIVE
24
26
28
BU-PWM3
BU-PWM2
BU-PWM1
PWM1
PWM3
PWM2
PWM3
PWM2
PWM1
40 LD-ON
48
49
BU UP/DOWN-SW
TBL-SENS
50
CD-MUTE
DISC TRAY
STATUS SENSOR
IC711
LASER DIODE
ON SWITCH
Q202 – 205
OPEN-SW 46
CLOSE-SW 47
OPEN
CLOSE
S701
DISC TRAY OPEN/CLOSE
DETECT
S711
OPTICAL PICK-UP
UP/DOWN DETECT
LOAD-OUT 45
LOAD-IN 44
9
7
RIN
FIN
MOTOR
DRIVE
4
2
OUT1
OUT2
TURN MOTOR
DRIVER
IC701
M721
(TURN)
M
SYSTEM CONTROLLER
(CD MECHANISM CONTROL)
IC501 (1/4)
• SIGNAL PATH
: CD PLAY (ANALOG)
: CD PLAY (DIGITAL OUT)
• R-ch is omitted due to same as L-ch.
OPTICAL
TRANSCEIVER
IC201
CD DIGITAL OUT
OPTICAL
CD
L-CH
RFAC
VCA
(LIMIT)
When the optical
pick-up is inner 
position
ON :
E-F BALANCE
(1 TRACK JUMP)
RV101
MUTING
Q201
MUTING CONTROL
SWITCH
Q206, 207
R-CH
67
66
XTAO
XTAI
X101
16.9344MHz
SECTION  7
DIAGRAMS
7-1.
BLOCK  DIAGRAM  – CD SERVO Section –
HCD-GX8000/RG77
24
24
FM ANT
ANT GND
AM ANT
ANT GND
ST-DIN
ST-CLK
ST-CE
ST-MUTE
TUNED
STEREO
L-CH
R-CH
ST-DOUT
TUNER UNIT
FM 75
AM
R-CH
25
ST-DIN
23
ST-DOUT
27
ST-CLK
22
ST-CE
21
ST-MUTE
DI
DO
CLK
CE
MUTING
3
TUNED
2
STEREO
TUNED
STEREO
R-CH
L-CH
R-CH
L-CH
R-CH
R-CH
HP901
(PB)
HRPE901
(REC/PB/ERASE)
1
3
2
4
R-CH
R-CH
REC/PB SWITCHING
IC302
R-CH
BIAS OSC
T301
BIAS
TRAP
REC BIAS
SWITCH
Q301, 307, 310
TC +10V
BIAS OSC
Q302, 303
TRIGGER
PLUNGER DRIVE
(DECK B)
Q391, 392
PM902
TRIGGER PLUNGER
(DECK B)
51
A-TRIG
TRIGGER
PLUNGER DRIVE
(DECK A)
Q393, 394
PM901
TRIGGER PLUNGER
(DECK A)
52
B-TRIG
90
B-SHUT
89
A-SHUT
34
32
BIN1
AIN1
15 13 12
14
28
27
EQOUT1
26
PB-OUT1
TAI1
MUTE
DECK A/B SELECT SWITCH,
PB EQ AMP
IC301 (1/2)
R-CH
23
REC-
OUT1
REC-IN1
ALC1
REC EQ AMP, ALC
IC301 (2/2)
21
R-CH
R-CH
68
ALC
C
(Page 25)
TAPE
L-CH
B
(Page 25)
TUNER
L-CH
D
(Page 25)
REC
L-CH
55 CAPM-CNT1
54 CAPM-H/L
65 BIAS
CAPSTAN
MOTOR DRIVE
Q396, 397
M
M
M901
(CAPSTAN)
57
B-PLAY
56
A-PLAY
11
ALC ON/OFF
S1002
(DECK B PLAY)
S1001
(DECK A PLAY)
70
A-HALF
S1003
(DECK A HALF)
91
B-HALF
S1006
(DECK B HALF)
S1009
(DECK B REC)
S1005
(DECK A REC)
D +3.3V
SYSTEM CONTROLLER
(CD MECHANISM CONTROL)
IC501 (2/4)
• SIGNAL PATH
• R-ch is omitted due to same as L-ch.
: TUNER (FM/AM)
: TAPE PLAY (DECK A)
: REC
: TAPE PLAY (DECK B)
ROTATION
DETECT SENSOR
(DECK A)
IC1001
ROTATION
DETECT SENSOR
(DECK B)
IC1002
DO
CE
MUTING
TUNED
STEREO
DI
CLK
REC BIAS (L)
(DECK B)
RV304
REC BIAS (R)
(DECK B)
RV354
CAPSTAN MOTOR
CONTROL SWITCH
Q1001
Q395
TAPE SPEED
(HIGH)
RV1001
TAPE SPEED
(NORMAL)
RV1002
A/B
NORMAL/HIGH SPEED
MUTE ON/OFF
REC MUTE ON/OFF
A/B
NOR/HIGH
REC MUTE
58
53
61 67 66
A/B
NOR/HIGH
REC-MUTE
PB-A/B
EQ-H/N
TC-MUTE
AMS-IN
REC MUTE
EQ
ALC
REC LEVEL (L)
(DECK B)
RV301
69
TC-RELAY
+
MUTING
Q306
MUTING CONTROL
SWITCH
Q389
BUFFER
Q390, 398, 399
LOW-PASS
FILTER
IC303
24
ANTENNA
REC/PB
SWITCHING
Q304, 305
D +3.3V
D +3.3V
7-2.
BLOCK  DIAGRAM  – TUNER/TAPE DECK Section –

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