Sony HCD-GTX66 / HCD-GTX77 / HCD-GTX77BP / MHC-GTX66 / MHC-GTX77 / MHC-GTX77BP Service Manual ▷ View online
29
HCD-GTX66/GTX77/GTX77BP
CD SECTION
[TEST DISC LIST]
Use the following test disc on test mode.
• CD:
• CD:
YEDS-18 (PART No. 3-702-101-01)
or
PATD-012 (PART No. 4-225-203-01)
Note:
1. CD Block is basically designed to operate without adjustment.
Therefore, check each item in order given.
2. Use YEDS-18 (3-702-101-01) unless otherwise indicated.
3. Use an oscilloscope with more than 10MW impedance.
4. Clean the object lens by an applicator with neutral detergent
3. Use an oscilloscope with more than 10MW 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.
following checks.
[S-CURVE CHECK]
Procedure :
1. Connect an oscilloscope to TP106 (FE) and TP124 (VC).
2. Turn the power on.
3. Load a disc (YEDS-18) and actuate the focus search. (In
1. Connect an oscilloscope to TP106 (FE) and TP124 (VC).
2. Turn the power on.
3. Load a disc (YEDS-18) and actuate the focus search. (In
consequence of open and close the disc tray, actuate the focus
search)
search)
4. Confirm that the oscilloscope waveform (S-curve) is
symmetrical between A and B. And confirm peak to peak level
within 3 ± 0.5 Vp-p.
within 3 ± 0.5 Vp-p.
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.
3. Mode: Playback
4. After the adjustments, apply suitable locking compound to
the pats adjusted.
Adjustment Location: Playback Head (Deck A).
Record/Playback/Erase Head (Deck B).
MAIN
board
CN510
board
CN510
test tape
P-4-A100
(10 kHz, –10 dB)
P-4-A100
(10 kHz, –10 dB)
pin 3
oscilloscope
L-CH
R-CH
V
H
waveform of oscilloscope
in phase 45
°
90
°
135
°
180
°
good
wrong
pin 2
pin 1
L
R
forward
reverse
+
–
–
TP106(FE)
TP124(VC)
oscilloscope
BD91 board
symmetry
S-curve waveform
within 3
±
0.5Vp-p
A
B
30
HCD-GTX66/GTX77/GTX77BP
[RF LEVEL CHECK]
Procedure :
1. Connect an oscilloscope to TP123 (RFO) and TP124 (VC).
2. Turn the power on.
3. Load a disc (YEDS-18) and playback.
4. Confirm that oscilloscope waveform is clear and check if RF
1. Connect an oscilloscope to TP123 (RFO) and TP124 (VC).
2. Turn the power on.
3. Load a disc (YEDS-18) and playback.
4. Confirm that oscilloscope waveform is clear and check if RF
signal level is correct or not.
Note:
Clear RF signal waveform means that the shape “
◊ ” can be
clearly distinguished at the center of the waveform.
Connecting Location: CD board
+
–
–
TP123(RFO)
TP124(VC)
oscilloscope
BD91 board
VOLT/DIV: 200 mV
TIME/DIV: 500 ns
RF signal waveform
level: 1.3
±
0.3 Vp-p
IC401
– BD91 Board (SIDE B) –
TP124
(VC)
TP123
(RFO)
TP106
(FE)
IC101
1
1
14
15
28
25
26
50
51
75
76
100
31
31
HCD-GTX66/GTX77/GTX77BP
HCD-GTX66/GTX77/GTX77BP
6-1. BLOCK DIAGRAM — RF/SERVO SECTION —
(Page 34)
SECTION 6
DIAGRAMS
DETECTOR
97
95
94
96
98
100
FNI1
FPI1
FNI2
FPI2
TPI
TNI
LD0
MDI
CD RF AMP,
FOCUS/TRACKING ERROR AMP,
DIGITAL SIGNAL PROCESSOR,
DIGITAL SERVO PROCESSOR,
DIGITAL FILTER,D/A CONVERTER
IC101
OPTICAL PICK-UP
BLOCK
(KSM-213DCP)
2AXIS
DEVICE
FOCUS/
FOCUS/
TRACKING
COIL
91
92
26
27
24
AUTOMATIC
POWER
CONTROL
Q301
LASER
DIODE
FOCUS COIL
DRIVE
18
17
20
TRACKING COIL
DRIVE
12
9
13
10
FOCUS/TRACKING COIL DRIVER,
SPINDLE, SLED MOTOR DRIVER
IC401
2
1
SPINDLE MOTOR
DRIVE
M
M
M401
(SPINDLE)
M
M
M402
(SLED)
FMO
FOO
DND
TRO
23 XI
24 XO
VREF
FOO
B
C
D
F
E
LD
PD
FCS+
FCS–
SL–
SL+
SP+
SP–
TRK+
TRK–
VC
VREF
VREF
11
PREF
77
VRO
84
SLED MOTOR
DRIVE
23
7
XRST
1
24
SBSY
19
BIAS
MUTE
MMUTE
2
4I/O
11
TRO
FMO
FOO
DMO
TRO
FMO
DMO
30
27
CD+1.5V REG
IC201
DVDD+3.3V
CD+1.5V
LO
RO
CD LCH
CD RCH
47
AOUT2(PO5)
DATA
63
BCK(PO8)
CLK
51
PIO3
GATE
49
PIO1
ST REQ
65
AIN(PI4)
AIN
66
BCKI(PI5)
BCKIN
67
LRCKI(PI6)
SELECT
1
12
1B
3
1Y
4C
3C
2C
1C
4
2Y 7
1A
2
2A
5
2B
6
3A
11
6
5
13
4O/I
3I/O
3O/I
2I/O
2O/I
1I/O
1O/I
10
23
22
21
6
39
3
5
38
BUS0
9
8
39
BUS1
3
4
40
BUS2 (SO)
1
2
11
10
9
8
3
4
1
2
41
BUS3 (SI)
48
PIO1
LRCKIN
BUS3
BUS3
BUS2
BUS1
BUS0
3Y 9
4Y 12
REQ
CCE
3B
10
4A
14
4B
13
BUCK
VM+7V
20 IO0(/HSO)
USB
SECTION
B
MAIN
SECTION
A
• Signal Path
11
12
9
3
93
CCE
BUS0
BUS1
BUS1
BUS2
BUS3
BUS3
SEL SW
CDCLK
CDCCE
CDCCE
MP3IREQ
42
BUCK
37
RST
54
SBSY
4I/O
12
4C
3C
2C
1C
6
5
13
4O/I
3I/O
3O/I
2I/O
2O/I
1I/O
1O/I
21
•
22
X102
16.934MHz
S201
(LIMIT)
DVDD+3.3V
SYSTEM CONTROL
IC401 (1/6)
SELECT SWITCH
IC567
SELECT SWITCH
IC566
SELECT SWITCH
IC568
SELECT
SWITCH
Q602
A
: CD PLAY
: DIGITAL
: USB
(Page 33)
32
32
HCD-GTX66/GTX77/GTX77BP
HCD-GTX66/GTX77/GTX77BP
6-2. BLOCK DIAGRAM — TAPE/TUNER SECTION —
(Page 33)
(Page 33)
(Page 33)
ST-L
E
MAIN
SECTION
REC-OUT-L
REC-OUT-L
D
MAIN
SECTION
TAPE
MECHANISM
BLOCK
32
A TRIGGER DRIVE
Q340,343
R-CH
TU901
FM/AM TUNER UNIT
ANTENNA
ST-L
FM ANT
AM ANT
AM ANT
ST-R
ST-DIN/MC-DOUT
ST-DOUT
ST-CLK
ST-CE
FM 75
COAXIAL
CAP M+
BTRGM+
ATRGM+
AHALF
BHALF
B SHUT
A SHUT
A SHUT
REC(FWD)
CAPM-CONT
B-TRIG
A-TRIG
TC-RELAY
A-HALF
B-HALF
B-SHUT
A-SHUT
A-SHUT
REC BIAS
PB-A/B
ALC
REC-MUTE
TC-MUTE
AM
EQ OUT1
A
B
ST-DIN/MC-OUT
SY-DOUT/MC-DIN
ST-CLK
ST-CE
ST-CE
34
28
27
26
24
21
55
57
58
59
60
42
3
90
89
91
52
56
51
54
53
E-1 45
E-2 44
E-3 43
86
84
85
87
13
11
15
14
PB OUT1
TAI1
REC IN1
AIN1
BIN1
A/B
ALC ON/OFF
REC MUTE ON/OFF
MUTE ON/OFF
DECK A/B SELECT,
PB/REC EQUALIZER AMP
IC301
SYSTEM CONTROL
(TAPE MECHANISM CONTROL)
IC401 (2/6)
REC-OUT1
EQ
TC-PB-L
TEST
CONNECTOR
CN510
R-CH
R
L
C
MAIN
SECTION
PB
HEAD
DECK-A
DECK-B
BIAS OSC
Q370
BIAS
TRAP
MUTE CONTROL
SWITCH
Q377, 379
TC PB MUTE
CONTROL SWITCH
Q382.383
R-CH
R-CH
Q376
Q373,374
Q381
L – CH
R – CH
R-CH
BIAS+9V
REC/PB
HEAD
ERASE
HEAD
Q378,380
T301
L – CH
R – CH
• R-CH is omitted due to same as L-CH.
A TRIGGER DRIVE
Q342,345
CAPSTAN MOTOR DRIVE
Q341,344
4
1
2
TABLE ADDRESS SENSOR
IC731
LD MOTOR DRIVER
IC701
TBL MOTOR DRIVER
IC712
M+9V
Q731
MOTOR
DRIVE
M751
(TABLE LOADING)
M
RE701
ROTARY ENCODER
DISC TRAY
ADDRESS DETECT
S751
OPEN/CLOSE
DETECT
LM-F
TBL SENS
FIN
RIN
RIN
48
OPENSW 41
LM-R 49
7
9
OUT2
OUT1
OUT1
2
4
MOTOR
DRIVE
M741
(TABLE)
M
TM-F
FIN
RIN
RIN
46
TM-R 47
7
9
OUT2
OUT1
OUT1
2
4
: TAPE PLAY (DECK B)
: TAPE PLAY (DECK A)
: TUNER
: RECORD (DECK B)
• Signal Path
: AUDIO
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