Focus Ok Circuit; Mirror Circuit - Pioneer PD-7050 Service Manual

FOCUS OK CIRCUIT
The Focus OK circuit functions to create the window
for the timing of switching ON the Focus Servo from
the Focus Search status.
With respect to the RF signal of Pin ©
?
both its HPF
signal and the reciprocal of the LPF output (inverted
phase) from the Focus OK Amp output are obtained
at Pin © .
The Focus OK output is inverted in the case below:
VRF. - VRFO = -0.39 V
MIRROR CIRCUIT
Fig. 4-15
Fig. 4-16
After amplifying the RFI signal, the Mirror circuit
performs Peak Hold and Bottom Hold.
Peak Hold will hold the peak value at a time
constant that is capable of tracking even a 30 kHz
Traverse signal, whereas Bottom Hold will hold the
bottom value at a time constant that is capable of
tracking even the envelope fluctuations of revolving
cycles.
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