Sony HCD-GNZ77D / HCD-GNZ88D / MHC-GNZ77D / MHC-GNZ88D Service Manual ▷ View online
25
HCD-GNZ77D/GNZ88D
0 dB=0.775 V
DECK SECTION
1. Demagnetize the record/playback head with a head
demagnetizer.
2. Do not use a magnetized screwdriver for the adjustments.
3. After the adjustments, apply suitable locking compound to the
3. After the adjustments, apply suitable locking compound to the
parts adjust.
4. The adjustments should be performed with the rated power
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.)
should be completed before performing recording circuit
adjustment.)
6. The adjustments should be performed for both L-CH and R-
CH.
7. Switches and controls should be set as follows unless otherwise
specified.
• Test Tape
Record/Playback Head Azimuth Adjustment
Note:
Perform this adjustments for both decks
Procedure:
1. Mode: Playback
1. Mode: Playback
Tape
Signal
Used for
P-4-A063
6.3 kHz, –10 dB
Azimuth Adjustment
DECK A DECK B
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).
set
MAIN board
IC101
Pin 28 (L-CH)
Pin 37 (R-CH)
IC101
Pin 28 (L-CH)
Pin 37 (R-CH)
MAIN board
IC101
Pin 36 (GND)
IC101
Pin 36 (GND)
+
–
level meter
test tape
P-4-A063
(6.3 kHz, –10 dB)
P-4-A063
(6.3 kHz, –10 dB)
MAIN
board
IC101
board
IC101
test tape
P-4-A063
(6.3 kHz, –10 dB)
P-4-A063
(6.3 kHz, –10 dB)
pin 37
oscilloscope
L-CH
R-CH
V
H
waveform of oscilloscope
in phase 45
°
90
°
135
°
180
°
good
wrong
pin 36
pin 28
L
R
forward
forward
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.
so that outputs match within 1dB of peak.
screw
position
position
L-CH
peak
peak
within
1dB
1dB
output
level
level
L-CH
peak
peak
R-CH
peak
peak
within
1dB
1dB
screw
position
position
R-CH
peak
peak
26
HCD-GNZ77D/GNZ88D
MEMO
27
27
HCD-GNZ77D/GNZ88D
HCD-GNZ77D/GNZ88D
6-1. BLOCK DIAGRAM — RF/SERVO SECTION —
: CD PLAY
: DVD PLAY
: SACD PLAY
• Signal Path
DETECTOR
6
2
3
4
5
11
10
19
18
252
253
DVDRFIP
DVDA
DVDB
DVDB
DVDC
DVDD
TPI
TNI
MC
MD
MD
C
D
LD01
MD12
LD02
MSW
MD11
OSP
OSN
CD/DVD RF AMP,
FOCUS/TRACKING ERROR AMP
DVD SYSTEM PROCESSOR
DIGITAL SERVO PROCESSOR
IC102(1/2)
OPTICAL PICK-UP
BLOCK
2AXIS
DEVICE
FOCUS/
FOCUS/
TRACKING
COIL
23
20
LI M SW
176
22
21
36
48
43
37
1
AUTOMATIC POWER
CONTROL (FOR DVD)
Q102 (2/2)
VOLUME CONTROL
Q101, Q103
L
AUTOMATIC POWER
CONTROL (FOR CD)
Q102 (1/2)
LASER
DIODE
(FOR CD)
LASER
DIODE
(FOR DVD)
FOCUS COIL
DRIVE
42
41
BUFFER
35
3
34
4
TRACKING COIL
DRIVE
32
38
42
37
41
30
47
FOCUS/TRACKING COIL DRIVER,
SPINDLE, SLED MOTOR DRIVER
IC201
27
28
SPINDLE MOTOR
DRIVE
M
M
SPINDLE
46
47
FMO
FOO
DMO
TRO
V REFO
SPFG
40 IOPMON
FOO
RF
A
B
C
D
F
E
CD LD
PD
LIMIT
VR650
VR780
MSW
DVD LD
FCS+
FCS–
TRK+
VCC
TRK–
SP+
SP–
SL+
SL–
D
C
B
A
V1P4
V1P4
9 NB
B
8 NA
A
30
29
SLED MOTOR
DRIVE
M
M
50
BUFFER
19
20
22
21
40
45
SYSTEM
CONTROL
IC401(1/4)
99
IFCK
MTK_CLK
33
100
XIFCS
MTK_XIFCK
27
110
PRST
MTK_RESET
26
98
IFSDO
MTK_SOD
32
101
IFSDI
105
IFBSY
KRMOD/HSYNC
MTK BUSY
28
KRMOD
24
MTK_SIO
31
TRO
FMO
FOO
DMO
TRO
10
13
FMO
DMO
211 MUTE123
210 MUTE
170 TSDM
210 MUTE
170 TSDM
207
MIC STATUS
25
MIC/VSYNC 205
SLED
SECTION 6
DIAGRAMS
28
28
HCD-GNZ77D/GNZ88D
HCD-GNZ77D/GNZ88D
6-2. BLOCK DIAGRAM — VIDEO SECTION —
DVD SYSTEM PROCESSOR
IC102(2/2)
217
ASDAT0
ASDAT1
ASDAT2
ASDAT4
ASDAT2
ASDAT4
225
SDPIF
EEPROM
IC103
6 5
SCL
SDA
CE
WE
OE
FLASH ROM
IC101
125-123, 121, 120, 118,
117, 115, 135, 133-128, 126
146, 147, 149-151,
158-160, 162, 164-166
22-26,
29-35
HIGHA0-7
IOA0-7, IOA18-IOA21
A16, A17
IOA0-7, IOA18-IOA21
A16, A17
AD0 – AD7
A1-A21
DATA & ADDRESS BUS
DATA & ADDRESS BUS
81-84,86-88,91
53-61, 67-72, 74-76,
78, 89, 92, 93
HD0 – HD7
A0 – A21
HD0 – HD7
A0
26
45
CE
WE
28
OE
11
A0 – A19
DQ15/A-1
77
IOCS
IOWA
79
IOUE
66
DQ0 – DQ7
RCLK
CE
WE
OE
SDRAM
IC104
38
DRCLK
RD0 – RD15
RA0 – RA11
RA0 – RA11
RD0 – RD15
142
RCS
19
RCS
138
RWE
16
RWE
140
RAS
18
RAS
139
CAS
17
CAS
DQM0
15
DQM0
DQM1
39
DQM1
CKE
37
DRCKE
102
SCL
103
SDA
143
BA0
20
BS0
BA1
21
BS1
29,31,33,35,38,40,42,44
25-16, 10 -1, 48
145
156
113 137 157
2,4,5,7,8,10,11,13,42,44,45,47,48,50,51,53
218
46
LOUT2+
SURROUND L
IC3731
GNZ77D
D/A CONVERTER
IC301
IC3751 (1/2)
IC3751 (2/2)
IC3771
IC3711
45
LOUT2–
219
222
203
YUV6
49
WIDE
48
DSEL
196
YUV2
194
YUV1
200
YUV4
202
YUV5
198
YUV3
220
XRST
215
ACLK
214
ABCK
213
ALRCK
14 SDTI1
V
C
Y
YG
YG
CR/B
CB/R
CB/R
WIDE
DSEL
(SL)
15 SDTI2
16 SDTI3
16 SDTI3
13 SDTI4
8
PDN
10 MCLK
9
BICK
17 LRCK
19 SCL
20 SDA
42
CENTER
41
40
SUBWOOFER
39
38
DOWNMIX L
37
2
FRONT L
1
DIGITAL
OPTICAL
TRANSMITTER
IC508
DVD
DIGITAL
OUT
LOUT3+
LOUT3–
(FC)
ROUT3+
ROUT3–
(SW)
LOUT4+
LOUT4–
(DMIXL)
LOUT1+
LOUT1–
(FL)
GNZ77D
B
MAIN
SECTION
208
SMSCK
206
VOICE
VOICE
SCORE
SCORE
A
MAIN
SECTION
C
MAIN
SECTION
XTALI
XTALO
229
228
X101
27MHz
• Signal Path
: VIDEO
: COMPONENT VIDEO
: AUDIO
: DIGITAL
(Page 29)
(Page 29)
(Page 29)
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