Zenith XBV 443, Service Manual

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3-65
IC202
(DSP) IC201
(Driver IC)
Pin23
Pin24
Pin33 Pick-up
F-
F+
Pin8
Pin9
FACT
FACT is made from focus error signal at DSP(IC202) and is input to IC201.
And then FACT is converted into F - and F+ in IC201.
Finally, they are sent to pick - up to control a focus actuator.
IC202
pin33(FACT)
IC201
pin8(F-)
IC201
pin9(F+)
A signal flow for FACT The waveform of FACT, F- and F+
19. Focus Drive signal(FACT)
MRESET signal is output from VCR µ-COM when power is on, so IC501 is initialized.
And those(VCR µ-COM and IC501) communicate each other through DVD-DATA, DVD-CLK signals
Waveforms display each signal when power on and after power on
IC501 pin214
(FLD_CLK)
IC501 pin2
(FLD_D_
OUT)
IC501 pin215
(FLD_D_IN)
IC501 pin130
(MRESET)
IC501
pin214
IC501
pin2
IC501
pin215
IC501
pin130
The waveform when power is on The waveform after power on
20. Signals for Front micom