Pioneer DEH-3770MP User Manual download pdf (Page 5)

CX-3158

1.1.3 Focus error amplifier

The photo-detector outputs (A + C) and (B + D) are applied to the differential amplifier and the error amplifier to obtain

the (A + C - B - D) signal, which is then provided from the pin 91 as the FE signal.

The low frequency component of the FE voltage is:

FE = (A + C - B - D) x 8.8/10k x 111k/61k x 160k/72k

= (A + C - B - D) x 3.5

The FE output shows 1.5Vp-p S-shaped curve based on the REFO. For the next-stage amplifiers, the cutoff frequency

is 14.6kHz.

1.1.4 RFOK

The RFOK circuit generates the RFOK signal, which indicates focus-close timing and focus-close status during the play

mode, and outputs from the pin 55. This signal is shifted to "H" when the focus is closed and during the play mode.

The DC level of the RFI signal is peak-held in the digital block and compared with a certain threshold level to generate

the RFOK signal. Therefore, even on a non-pit area or a mirror-surface area of a disc, the RFOK becomes "H" and the

focus is closed.

This RFOK signal is also applied to the microcomputer via the low-pass filer as the FOK signal, which is used for pro-

tection and RF amplifier gain switching.

1.1.5 Tracking error amplifier

The photo-detector outputs E and F are applied to the differential amplifier and the error amplifier to obtain the (E - F)

signal, and then provided from the pin 136 as the TE signal.

The low frequency component of the TE voltage is:

TEO = (E - F) x 63k/112k x 160k/160k x 181k/45.4k x 160k/80k

= (E - F) x 4.48

The TE output provides the TE waveform of about 1.3Vp-p based on the REFO. For the next-stage amplifiers, the cut-

off frequency is 21.1kHz.

Fig. 1.1.3 TE

VERF

P10

130

112K

160K

129

112K

160K160K

63K

80K

161K

45R36K

63K

VREF

TEOFF setup

TE A/D

60K

20K

Inside TEC

139

TEO

138

TE-

140

TE2

141

TEC

47P

6800P

CD CORE UNIT

PICKUP UNIT

UPD63763GJ

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Pioneer DEH-3770MP User Manual Page 5

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