Philips DVDR985 Technical Training Manual page 54

MACE3 Servo Microcomputer
The MACE3 IC is the Mini All Cd Engine third
generation. Its vendor number is SAA7830. It is
a combined servo processor and microcomputer.
The servo processor handles the signals for
focusing and tracking for disc access. It also
Figure 26 - PCS Motor
Figure 27 - PCS Phase compaision
Figure 28 - PCS input Block
generates the control signals for tray control. In a
CD/DVD system, there are several active control
loops. Some of them are needed to adjust the
servo error signals. It monitors and adjusts the
offsets, signal amplitudes, and loop gains
(AGCs). The control loops determine the laser
spot position on the disc in the radial (Sled),