Sony DVP-S7000 (serv.man2) Service Manual ▷ View online
– 114 –
Figure 5-25.
DVD/CD disc judgment block
Figure 5-24.
Disc judging sensor (DVD/CD) operational principle
IC136
HD6413002F
MB-75 BOARD
Drive
Control
91
DET
IC003
NJM3404AM
TT-701 BOARD
5
7
2
1
CN002
From SPINDLE
BOARD
1
CDDET
CN980
20
CN005
20
3
CD disc,
track pitch 1.6
µ
m
Disc judging sensor
Primary beam
(diffraction)
Zero beam
(reflection)
18˚
DVD disc,
track pitch 0.74
µ
m
Disc judging sensor
Primary beam
(diffraction)
Zero beam
(reflection)
18˚
– 115 –
5-6-2.
Disc Size Judgment
The disc size, 12cm or 8cm, is judged to change over the spindle servo gain.
(1) DVD disc
(a) DVD disc is loaded and chucked, then immediately after the spindle motor started,
whether the time from spindle speed 0rpm up to about 1400rpm is longer than
about 0.28 second.
(b) Whether disc judging information of the read disc data is 12cm or 8cm.
From the above two factors, a disc is judged as follows:
Disc speed-up time
Disc information
DVD disc judgment
Below 0.28sec
8cm
8cm
Below 0.28sec
12cm
12cm
Over 0.28sec
*8cm
12cm
Over 0.28sec
12cm
12cm
*Disc information is judged erroneous.
(2) CD disc
(a) CD disc is loaded and chucked, then immediately after the spindle motor started,
whether the time from spindle speed 0rpm up to about 1400rpm is longer than
about 0.28 second.
(b) Whether total time of programs in TOC data is longer than 22 minutes.
From the above two factors, a disc is judged as follows:
Disc speed-up time
Total time > 22min
CD disc judgment
Below 0.28sec
Shorter
8cm
Below 0.28sec
Longer
12cm
Over 0.28sec
*Shorter
12cm
Over 0.28sec
Longer
12cm
*TOC data is judged erroneous.
In either case of DVD or CD, if the disc (spindle motor) speed-up time is below about
80ms, the controller judges that no disc is present.
– 116 –
5-6-3.
SL (Single Layer) or DL (Dual Layer) Disc Judgment
For the DVD disc, SL or DL disc is judged as follows:
(1) Reflected light quantity of DVD optical pickup laser beam, and DC (peak) value of PI
(pull in) signal level.
To judge the PI signal level, a focus search is executed after disc chucking, and the peak
value of the obtained PI signal (DPD-PI) is held in the IC771 (NJM3403), then it is
entered to the drive microcomputer IC136, *¡P, and internal A/D converter measures
the PI signal level for judgment.
(2) Of the data read from DVD disc, the reflectivity written to the ID (Identification Data).
From the above two factors, a disc is judged as follows:
*PI signal level
ID reflectivity
DVD judgment
(Initial) (Last)
Small (
≤
about 2.94V)
Low (
≤
40%)
DL
→
DL
Small (
≤
about 2.94V)
High (40%<)
DL
→
SL
Large (about 2.94V<)
Low (
≤
40%)
SL
→
DL
Large (about 2.94V<)
High (40%<)
SL
→
SL
The initial result of DVD disc judgment is effective in a period from focus servo ON to
reading of ID reflectivity from disc, and after that, the last result (disc ID reflectivity) becomes
effective.
The laser output of DVD optical pickup is larger during DL disc playing than that during SL
disc playing.
– 121 –
6.
IC PIN DESCRIPTION
6-1. RF Front Processor
SSI33P3720 (IC001 on TT-701 board)
6-1-1.
Block Diagram
Figure 6-1.
Block diagram
+
+
+
GCA
LPF
+
+
+
GCA
LPF
+
+
+
GCA
LPF
+
+
+
GCA
LPF
+
+
+
GCA
LPF
+
+
+
GCA
LPF
+
+
+
GCA
LPF
+
+
+
GCA
LPF
+
–
–
+
+
+
+
–
–
+
–
+
+
+
+
–
–
+
–
–
GCA
EQ
EQ
EQ
EQ
GCA
GCA
GCA
DAC x 2
VC
VC
GCA
GCA
MUX
MUX
MUX
OFFSET
OFFSET
OFFSET
OFFSET
GCA
DAC
DAC
INV
PHASE
DETECTOR
PHASE
DETECTOR
DAC
AGC
CHARGE
PUMP
GCA
LPF
TEST
FROM
S-PORT
FROM
S-PORT
FROM
S-PORT
FROM
S-PORT
FROM
S-PORT
FROM
S-PORT
FROM
S-PORT
FROM
S-PORT
4
IDSEL
3
FROM
S-PORT
5
AGC
FROM
S-PORT
FROM
S-PORT
FROM
S-PORT
FROM
S-PORT
DIFF
Amp.
AGC
AGC
ATT
PROGRAMMABLE
EQUALIZER
FILTER
DIFFERENTIATOR
FULL WAVE
RECTIFIER
AGC
CHARGE
PUMP
59
60
61
62
63
64
46
49
48
7
8
9
10
15
14
13
12
1
2
3
4
5
6
51
52
54
53
57
47
56
55
39
37
41
42
38
40
LOW Z
LOW Z
LOW Z
AGC
4
A+D
B+C
3
3
4
4
PP
B+C
A+D
CD
4
4
DVD-ROM
Comp.
2
3
8
TE1
SUM
Amp.
Amp.
IDSEL
ATOP
ATON
AIN
AIP
FNP
FNP
DIN
DIP
SIGO
HOLD1
BYP
RX
FE
PI
HOLD2
BYP2
PP
TE
CN
CP
RFP
RFN
IDSEL
PWRON
LOW Z
A
B
C
D
E
F
G
H
A2
B2
C2
D2
FROM
DVD OPTICAL
PICKUP
DVD OPTICAL
PICKUP
FROM
DVD OPTICAL
PICKUP
DVD OPTICAL
PICKUP
NOT USED
TO
MB BOARD
MB BOARD
TO
MB BOARD
MB BOARD
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