Technics SL-P202A - Techanical Information

mw TECHNICAL INFORMATION
Explanation on the CDM4 mini system and
servo circuit for service engineers
1.System Configuration |
1-1.Block Diagram Rough
TDA8808
Photo Diode
Signal
Processor
Optical
Pick-up
Focus
Z r
Driver Focus Moto
CDM4 mini «———— Servo Circuit
® Refer to the page 18 and 19.
2.Rough Explanation of the Functions
of the CDM4 mini System Part.
2-1.Servo electronics CDM4 mini systen.
TDA8808:| bipolar photo diode signal
processor
@ Photodiode signal preamplifiers
with separate h.f. and d.c.
a.g.c. for optimum generation of
the h.f. data signal and the
focusing/tracking error signals.
e Tracking error signal amplifier.
e Focus error signal processor with
focus normalizing and _ start-up
circuit.
@ Data equalizer.
h.f. level and track-loss
detectors.
e Regulated supply for the reading
laser diode.
® Low current consumption: 15mA (8V
-14V).
Bry. Wy eee
TDA8809
Radial Error
Processor
Radial Radial
Driver Motor
TDA8809:| bipolar radial error
processor
Tracking error’ processor with
automatic asymmetry control.
a.g.c. circuitry with automatic
start-up wobble generator.
Tracking control for fast
forward/reverse scan, search,
repeat and pause functions.
Low current consumption: 10mA
(8v - 14V).