Pioneer DVL-909 Service Guide - Page 6

DV-505, DVL-909, DV-S9 1.2 EXPLANATION OF EACH MOVEMENT 1.2.1 Sequence Up to Playback DVD SETUP RF AGC ON LD ON Sweep UP → Down Focus Lock Yes SPDL ACCEL MIRR Modulation Measurement T Servo ON SLDR Servo ON F Gain Adj. T Gain Adj. AFB Adj. (Auto Focus Bias) Layer Det. ATB ON Lead-in Search PLAY 1.2.2 Focus Servo FE generated in the RF IC is sent to the Digital servo IC. For a DVD, the servo is turned on during the transition from "Up" to "Down" of the first-order sine wave. For a CD, it turns on during the transition from "Down" to "Up" of the first-order sine wave. When the servo is turned on, the level of PH (the envelope of the bright side of RF) increases, and DRF becomes H. The kick-brake pulses, such as those for FOCUS jump, are also output from pin 49 of IC201. • FOCUS SERVO PICKUP RF B1 OEIC B2 B3 B4 LD MD FOCUS COIL OEIC GAIN 3 PH 58 32 5 6 IC101 RFIC FE 31 IC201 35 DIGITAL 7 SERVO IC LASER 8 13 54 11 12 22 SGC 44 49 26 1 IC151 2 DRIVER 4 FDO 54 IC501 ADDRESS MECH. & BUS CONTROL 27 DRF • FOCUS LOCK TIMING CD LDON UP FDO DVD UP FE DRF (FOK) 6