CXA2061 Sony Corporation, CXA2061 Datasheet - Page 28

• Manufacturer Part Number: CXA2061
• Description: Y/C/RGB/D for NTSC Color TVs
• Manufacturer: Sony Corporation

Description of Operation
1. Power-on sequence
The CXA2061S does not have an Internal power-on sequence. Therefore, all power-on sequence are controlled
by set microcomputer (I
1) Power-on
The IC is reset and the RGB outputs are all blanked. H drive starts to oscillate, but oscillation is at the
maximum frequency (16kHz or more) and is not synchronized with the input signal in order to prevent FBT
(flyback transformer for generating high voltage) H squealing. Output of vertical signal V TIM start, but V dirve
is DC output. Bus registers whitch are set by power-on reset are as follows.
2) Bus register data transfer
The register setting sequence differ according to the set sequence. Register setting for the following sequence
are shown as an example.
Set sequence
Power-on
Degauss
V DRIVE oscillation
AKB operation start
AKB Ioop stable
Video output
P ON
HD W
V ON
FH HIGH = 0: H oscillator maximum frequency mode
AGING
YUV OUT = 0
= 0: RGB all blanked On
= 0: Normal mode
= 0: V output stopped mode
= 0: All white output aging mode OFF
2
CXA2061S register setting
Reset status in 1) above.
Reset status in 1) above
The CRT is degussed in the completely darkened condition.
The IC is set to the power-on initial setting. (See the following page.)
A sawtooth wave is output to V DRIVE and the IC waits for the vertical deflection to
stabilize. The H DRIVE oscillator frequency goes to the standard frequency.
R ON, G ON, B ON are set to "0", P ON is set to "1" and a reference pulse is output
from ROUT, GOUT and BOUT. Then, the IC waits for the cathode to warm up and the
beam current to start flowing.
Status register IKR is monitored.
IKR = 0: Unstable
IKR = 1: Stable
Note that the time until IKR = 1 is returned differ according to the intial status of the
cathode
R ON, G ON, B ON are set "1" and the video signal is output from ROUT, GOUT and
BOUT.
C bus controller).
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CXA2061S