Pioneer PD-6050 Panduan Servis - Halaman 26

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Note

that

since

this

EFM

Comparator

power-current SW type, its H and L levels will not

equal the supply voltage, there is feedback via the

decoder's C-MOS Buffer.

R2Q, R21, CI6, and C17 serve as a LPF for

obtaining the DC of (Vcc + DGND)/2 [V].

DEFECT CIRCUIT

After inverting the RFI signal, the Defect circuit

performs Bottom Hold using two time constants, one

long and one short. The Bottom Hold performed by

the short time constant sends a response at a

mirror-surface defect on the disc that is 0.1 ms or

longer.

The Bottom Hold performed using the long

time constant continues holding the mirror surface

at the level preceding the defect.

The Mirror

Defect Detection signal is generated by performing

a fine plus level shift of that mirror level by use of

C coupling, then making a comparison of both

signals.

When this signal is used and the DEFECT output is

"H," TRKG error is muted and the payability is

improved.

Fig. 4-19