Samsung DVD-905, Service Manual, Page: 30 / 136

Reference Information
Samsung Electronics 2-11
Fig. 2-21
The control parameters of DVD EQ and CD EQ are as follows.
1) DVD EQ control parameter
- DVDEQ(pin 43) : Changes the gain of peak frequency with EQ frequency characteristic. Convert PWM
signal, output from TC90A19F, into DC via low-pass filter.
- DVDTIME(pin 41) : Changes the peak frequency with EQ frequency characteristic. Convert PWM signal,
output from TC90A19F, into DC via low-pass filter.
- S/Dse1(pin 64) : Changes the peak frequency (like DVD TIME) as 2d control. ( Switched according to
regeneration speed ratio of single/double layer).
- MCK(pin 15) : Input the base clock and link the peak frequency with it. The amplitude of MCK might be
small (500mVp-p).
- DVDGD(pin 25) : Changes the group delay characteristics with EQ frequency characteristic.
2) CD EQ control parameter
- CD EQ(pin 40) : Changes the gain of peak frequency with EQ frequency characteristic. The constant DC is
supplied to a resistive voltage divider.
- CD TIME(pin 42) : Changes the peak frequency with EQ frequency characteristic. The constant DC is
supplied to a resistive voltage divider.
- S/Qse1(pin 44) : Changes the peak frequency (such as CD TIME) as 2d control. (Switched according to play
linear velocity ratio of quadruple/single rate. Set to Ô0Õ because only one rate is vaild in
this system).
Note : CD and DVD signals are equalized according to the above control parameters ,and then output to CD
EQ OUT (pin39) and DVD EQ OUT (pin34). Then, CD signal is transferred to TC9420F, DVD signal is
sent to TC90A19F and detected.
DVDsel RFgain EQout EQin
CD
EQ CD
TIME SQsel
RFN
RFP
47 48 46 45 40 42 44
55
54
64 41 43 15
34
25
39
VCA
ATT CD EQ
DVD EQ
RIC1
TA1236F
GEN.
T/CON
SDsel DVD
TIME
DVD
EQ
MCK
DVD G/D
DVD EQ OUT
CD EQ OUT
2-2-2 Description of data processor for DVD
(Including DIC1 and DIC5 protection IC)
1. Outline
The data processor IC for DVD does the following :
1) Converts RF signal to digital, demodulates original signal and corrects errors,
2) PLL circuit to generate the clock for data detection in accordance with play velocity,
3) CLV control circuit to control the rotation rate of disc,
4) DIC5 Protection IC, connected with input/output of data processor, which releases the protection for the
protected data (which is then transmitted to video decoder and Micom).