LG GDR-8161B Service Manual page 21

F1
49
F2
50
E2
51
E1
52
RFP
47
RFP
48
x1
46 x1
DVD-RAM 2.6G, 4.7G have CAPA(Complementary Allocated Pit Address) differnt from DVD-ROM.
CAPA is consist of same pit like DVD-ROM disk,that's why even blank disk has it.
CAPA has PID(Physical ID) which shows address on disk.
DVD-RAM 2.6G,4.7G use (REDiF, IDGATE, DTRD, VFOSHORT) signal to read PID.
This signal is not used in DVD-ROM and CD-ROM.
- RFDiF signal :
- IDGATE signal:
- DTRD signal :
- VFOSHORT signal : This signal is made by RFDiF signal and PLL clock in IC201.
IC101
x2
VGA
MUX
x2
35 5 10 9
DVD-RAM 2.6G, 4.7G system
This signal is made from main 4D(main beam) in IC101 and sent to IC201.
This signal is used of generation of IDGATE,DTRD, VFOSHORT signal in IC201.
This signal is used to control PLL frequency for seek.
This signal is made by RFDiF signal and PLL clock in IC201.
IDGATE signal detect CAPA and input "H" to IC101.
IDGATE signal is changed to RF signal of slicer of IC201 in IC101.
When IDGATE signal is "H", it feed into IC101 47, 48 pin and CD offset is removed (For
up to readability) and RF signal of CAPA is sent to IC201 slicer. When IDGATE is "L", it
feed into IC101 47, 48 pin and user data RF signal is sent to IC201 slicer.
This signal is made by RFDiF signal and PLL clock in IC201.
This signal is used for read of PID read and user data read timing in IC201.
DTRD signal is sent to IC101 and used for hold of RFAGC. When DTRD signal is "L"
and IDGATE is "L", RFAGC is held.
VFOSHORT signal is "H" in front of CAPA and user data, RF signal is shorted and
remove DC offset to read PID of CAPA and user data.
34
RFDIF
ARF
31
EQ
30
NARF
DTRD
IDGATE
VFOSHORT
IC201
IDGATE
93
Generator
91 Comparator
Only
Seek
PLL
98
SLICER
99
Decoder
DTRD
Generator
VFOSHORT
Generator
80 124 123
29