4-9. CRT CORRECTION circuit
Following adjustment and functions are for CRT correction.
Q
H/V-CONVERGENCE
R
TILT-DY
S
NS-RRC
T
Landing (TR/TL/BR/BL)
(1) H/V-CONVERGENCE and TILT-DY
The signal input to IC205 (D/A) from IC301 (Main Microprocessor) by I
2
C -BUS is output from pins 2 (TILT), 3 (H-
CONV), 4 (V-CONV) and vary the current applied to each coils built-in deflection yoke by IC206 and IC207
(POWER-OP-AMP). It makes H/V-CONVERGENCE and TILT-DY change.
(2) NS-RRC
The signal input to pins 18 and 19 of IC301 from IC304 (Terrestrial magnetic sensor) and applied to IC205, and
output from pin 1 of IC205, and vary the current in NS-COIL by IC206. It makes NS-RRC change.
(3) Landing
TH150 (thermistor) detects the set surrounding temperature and CT connector (thermistor) detects the CRT
temperature of funnel. These correct the landing temperature.
The information of the CRT temperature of funnel is received at pin 20 of IC301 and the information of surrounding
temperature is received at pin 4 of IC104, and then sent to IC301 by I
2
C-BUS. The information is output from pins
10, 11, 12 and 13 of IC301 as pulse width modulation and vary the current in Landing correction coil (TR/TL/BR/
BL) by IC801 and IC802 (POWER-OP-AMP). It makes Landing change.
- 29 -
4-10. LANDING CORRECTION circuit
This circuit detects the followings to correct LANDING discoloration.
•
Magnetic field.....TERRESTRIAL MAGNETIC SENSOR (IC304) detects the magnetic field.
•
SWITCH ON DRIFT.....TH801 detects surrounding temperature. Thermistor attached to the funnel detects the
temperature of funnel.
•
Surrounding temperature.....TH801 detects surrounding temperature.
When the above condition is changed, the MICROPROCESSOR (IC301) informs the change to the D/A CONVERTER
(IC205). The output signal from IC205 is amplified by IC801, IC802, IC206 and IC207 to correct LANDING discoloration
automatically by the coils N-S RRC, TL, TR, BL and BR.
The LANDING correction also can be performed with the front buttons.
MICROPROCESSOR
IC301
D/A
CONVERTER
IC205
H-CONV
V-CONV
NS RRC
TILT
TR/TL
BR/BL
IIC-BUS
GEOMAGNETIC
SENSOR
IC304
Vx-OUT
V
Y
-OUT
POWER
AMPLIFIER
IC801
IC802
IC206
IC207
NS RRC +,–
LANDING-TL/TR/BL/BR
TILT
H/V-CONVERGENCE
TEMP
Summary of Contents for Vision Master Pro 451
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