Tray Open And Close; Focus Drive Signal(Fdo) - LG GoldStar DVD5185 Service Manual

19. Tray Open and Close

CPLD send tray - open or tray - close signal to IC203(motor drive IC)
IC203 generates LM+ and LM - and transmits them to operate a loading motor.
if there is no LM+ or LM-, check the Tray-open and Tray-close. And replace the Motor Drive IC .
IC502
CPLD
Tray-open
Pin 4
Tray-close
Pin 3
A signal flow for tray open and close

20. Focus Drive signal(FDO)

FDO is made from focus error signal at DSP(IC201) and is input to IC203.
And then FDO is converted into F - and F+ in IC203.
Finally, they are sent to pick - up to control a focus actuator.
IC201
FDO
Pin115
A signal flow for FDO
IC203
Driver IC
LM-
Pin 1 Pin 9
MD
LM+
Pin 2
Pin 10
IC203
Driver IC
F-
Pin25 Pin15
Pick-up
F+
Pin16
Pin26
IC203
pin1
IC203
pin2
The waveform input to IC203 for tray open and close
IC201
pin115
IC203
pin15
IC203
pin16
The waveform of FDO, F- and F+
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