Hitachi CL43WP910TAN, Service Manual

Page: 10 / 77

Auto Digital Convergence (MAGIC FOCUS) System
The auto digital convergence system can readjust convergence with one touch operation.
The system is composed of 8 photo detectors, an A/D converter, and an optical pattern
generator internal GATE ARRAY compared with conventional systems.(As shown in follow Fig.)
The System can measure the dislocation of the image in each overscanned area,
where 8 photo detectors are located, with respect to another. Therefore ,it can recover
the “good” convergence state to which the TV was adjusted , before the misconvergence occurred.
This set has three mode Digital convergence data. (PAL , NTSC Progressive, PAL 100Hz Interlace)
So need to operate three times Adjustment and setting.
1M BITS
64K BITS
8 BIT BUS
REMOTE
CONTROLLER
EEPROM
RAM
CORRECTION
PATTERN
CPU
SCREEN
A/D
10 BIT DATA
PHOTO
DETECTOR
PUSH SWITCH
8000 GATES
PLL
ADDRESS
COUNTER
AVERAGECALCULATOR
DATA CONVERTER
GATE
ARRAY
NORMAL PATTERN
GENERATOR
OPTIONAL PATTERN
GENERATOR
D/A
S/H
BH
S/H
BV
S/H
GH
S/H
RH
S/H
RV
S/H
GV
fc=16MHz
H
SYNC
V
CONVERGENCE
OUTPUT
RGB
VIDEO
OUTPUT
ADJUSTMENT POINT 13(H x9(H) POINTS
Fig. 8 Auto Digital Convergence System.