9. Checking the first step of servo (1)
LetOs look over the initial step of DSPDSP. DSP perform the procedure of PLL-loop
by using this signal.
1) First. DSP IC receive the DSP - Reset from
CPLD5) after checking the PLL-loop, the second step is
followed. the second step will be explained on
2) This reset signal get DSP initialized and DSP is
next page�..
ready to do first step for servo
if TSTSG doesnOt appear, check DSP and
3) TSTSG from DSP is the test signal for checking
replace. if the unit doesnOt work normally, even
the PLL- loop
though the both signals are OK.Check the RF
4) RF IC regard this test signal as RF signal whichIC and replace.
is coming from P/up and send this signal to
IC201
Vcc(3.3V)
DSP IC
720 Khz4.3 Mhz
Reset period
47110 82
DSP-RST
DSP-RSTTSTSG
IC502IC202TSTSG
CPLDRF IC
10. Checking the second step of servo (2)
LetOs look over the initial step of servo4) the following step will be done continuously CD -
Laser on -> move lense -> DVD - laser on ->
1) when the tray is closed, first of all, it should bemove lense. in according to disc type, there will
checked whether there is disc or not on traybe RF signal�
2) CD laser is turn on and the lense is moved. if5) after confirming disc, CD or DVD laser turn on
there is a disc on tray, RF signal will appearand focus servo is executed�
3) next, it should be confirmed which disc is that.the below picture is related signals when DVD
CD or DVD.disc is inserted
M/D
ASSYF+
move lense
CD/DVD
DVD laser on
CD laser on
CN201
LD-DVD
LD-CD
LD-DVD
IC202
RF IC
1) ~ 2)4)5)6)
3-6 |
ACEC
