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(4) North-south horizontal field landing cancel
The north-south horizontal field landing cancel carries out automatic adjustment of color shading and
color shift occurring appeared in the opposite derection at the top and bottom end of the monitor
display surface in the horizontal direction.
The detecting voltage and direction of the north-south horizontal field (IC214 pin 2) are detected by
IC214 (geomagnetic sensor unit), the detecting voltage is read by IC101 pin 18 (CPU_ADC), and the
direct current of
±
20mA (max) flows in each corner purity coil according to the specified control
program. (Four-corner interlock control)
•
The left upper corner on the display surface is controlled with 0 to 5V of 2.5V reference
by IC101 pin 6 (PWM-DAC), and the DC current of the above value is made to flow to
the purity coil on the left upper corner by IC803 pin 2.
•
The right upper corner on the display surface is controlled with 0 to 5V of 2.5V refer
ence by IC101 pin 7 (PWM-DAC), and the DC current of the above value is made to
flow to the purity coil on the right upper corner by IC803 pin 8.
•
The left lower corner on the display surface is controlled with 0 to 5V of 2.5V reference
by IC101 pin 8 (PWM-DAC), and the DC current of the above value is made to flow to
the purity coil on the left lower corner by IC801 pin 2.
•
The right lower corner on the display surface is controlled with 0 to 5V of 2.5V reference
by IC101 pin 9 (PWM-DAC), and the DC current of the above value is made to flow to
the purity coil on the right lower corner by IC801 pin 8.
1.5.3
Earth magnetism cancel circuit
The earth magnetism cancel circuit has a south-north horizontal magnetic field canceling
function and a vertical magnetic field canceling function.
IC214 (earth magnetism sensor unit) detects the voltage and direction of the south-north hori-
zontal magnetic field (IC214 pin 2) and the vertical magnetic field (IC214 pin1), and IC101 pins
18 and 19 (CPU_ADC) reads the detected voltage to automatically control the following cancel-
ing function according to the specified control program.
Here, the output voltage of IC214 (earth magnetism sensor unit) operates as follows.
•
South-north horizontal magnetic field (IC214 pin 2): 0.8V(-0.04mT) to 2.5V(+/-0.00mT) to
4.2V(+0.04mT)
•
Vertical magnetic field (IC214 pin 1) : 3.3V (-0.04mT) to 2.5V (+/-0.00mT) to 0.5V (+0.10mT)
<South-north horizontal magnetic field canceling function>
(a) Horizontal magnetic field landing cancel
The horizontal magnetic field landing cancel circuit is a circuit to compensate for the color
shade and deviation that appear in the horizontal direction that becomes the opposite
direction at the upper and lower ends on the monitor display surface, and the automatic
adjustment is done by DC current flowing to the corner purity coil that is wound around the
display surface. (synchronized control for four corners)
(Refer to 1.5.2 (4) for detail.)
(b) Horizontal magnetic filed convergence cancel
The horizontal magnetic field convergence cancel circuit is the circuit to compensate for
the misconvergence that results after the vertical convergence of RED and BLUE in the
whole display area of the monitor deteriorates, and it is automatically adjusted by DC
current flowing to the 4V convergence compensation coil mounted on DY. It is controlled
with the DC component (V-CONVERGENCE) by IC601 pin 60 (4V_SC), and DC current of
+/-30mA (max) is flowen to the 4V convergence compensation coil by IC8A1 pin 6 (Power
Opamp).
Summary of Contents for MultiSync FP1355 FP1355 FP1355
Page 23: ...1 17 Q502 Q502 Damper diode Current waveform fh 106k ...
Page 25: ...1 19 Q502 Q502 Damper diode Current waveform Q502 Ic Q502 Vce ...
Page 58: ...1 52 Figure 25 IC211 MC13289ASP block diagram ...
Page 63: ...1 57 Figure 30 IC212 XC3824P2 block diagram ...
Page 65: ...1 59 1 11 Wave form of main circuit voltage ...
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Page 120: ...MultiSync FP1355 User s Manual ...
Page 144: ... VSP C0464 REVISE 2 ...
Page 166: ...Fig 2 BEZEL LOGO VSP C0464 COLOR OF LETTERING Kingfisher Blue 6704 11 5 24 5 66 ...
Page 169: ...VSP C0464 Fig 5 1 PRINTING SPECIFICATION OF CARTON BOX North America ...
Page 170: ...VSP C0464 Fig 5 2 PRINTING SPECIFICATION OF CARTON BOX Europe ...
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