Zenith DVB318, Service Manual

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3-9
The waveform is to display F+ signal from pin 9 IC201 and SPM+ from pin 10 IC201.
F+ is used to control a focus actuator of pick - up and SPM+ is used to operate a spindle motor.
So, we can know the position of the acuator and the speed and rotating direction of the spindle
motor through those signals.
IC201
pin 9
IC202
pin 28
The waveform F+ and SPM+ in the PLAY Mode
16. The status Focus and spindle motor
This waveforms are showing “The Downloading serve program”.
The must important thein of the download process is the timing.
The servo program must be downloaded before the second DSP reset.
DSP_Reset(IC501 pin186 to IC202 pin81)
/MRESET
IIC_DATA(IC501 pin194 to IC202 pin69)
DSP_Reset active Low
IIC_CK(IC501 pin195 to IC202 pin68)
17. DATA STREAM