Checking The Focus & Tracking Servo; Checking The Track Jump - LG GoldStar DVD5185 Service Manual

13. Checking the focus & tracking servo
Waveforms as below are regarding focusing and tracking servo normally.
FE, RFENV and AS signal are generated in IC202 and output at pin22, pin41 and pin20 of IC202,
respectively.
And then those are transmitted to pin117, pin120 and pin119 of IC201.
TE and OFTR signal, needed to control tracking servo, are also generated in IC202 and output
at pin18 and pin39 of IC202. After that those are transmitted to pin118 and pin51 of IC201,
respectively. TDO is made by being processed with TE in IC201
FE
IC201 Pin117
RFENV
IC201 Pin120
AS
IC201 Pin119

14. Checking the track jump

TE and TDO signals are output respectively from pin 118 and pin 114 of IC 201 during a normal play.
FMO signal is output pin 67 of IC 201 and flow into pin 25 and pin 26 of IC 203 to operate a sled motor
when to skip chapters or to scan.
IC201
pin114
IC201
pin118
IC201
pin67
The waveform during a normal play
TDO
IC201 Pin 114
TE
IC201Pin 118
OFTR
IC201 Pin 51
IC201
pin114
IC201
pin118
IC201
pin67
The waveform when to skip or scan
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