8-61
2) PURITY CORRECTION PART
2-A) NORTH/SOUTH purity correction
MPU controls output voltage by comparing the sensor voltage (IC801 pin48) with the reference voltage
(IC801 pin49) and GLOBALSYNC OSD.
The D/A converter (IC532 pin16) output center voltage is 2.5V and variable range is between 0V and +5V.
The DC output current flows in the EMF (Earth Magnetic Field) coil.
This current flows to the feedback resistor (R4J6) of IC4J1.
This current is detected as voltage at the feedback resistor.
NOTE) : During DEGAUSS, becomes Low level(D/A converter output voltage is 2.5V), therefore the current
doesn
’
t flow in the EMF coil.
And it prevents magnetization in the CRT.
(The example of image: Correction of NORTH/SOUTH purity)
2-B) Four corner purity correction.
MPU controls output voltage by comparing 4 input voltages(IC801 pin47,pin49,pin50,pin51) and
GLOBALSYNC (TOP LEFT, TOP RIGHT, BOTTOM LEFT, BOTTOM RIGHT) OSD.
The D/A converter IC532 (pin14:TOP LEFT, pin8:TOP RIGHT, pin9:BOTTOM LEFT, pin7:BOTTOM
RIGHT) output center voltage is 2.5V and variable range is between 0V and +5V.
The DC output current flows in the corner coil(four corner).
This current flows to the feedback resistor(R4N6,R4R6,R4L6,R4M6) of output circuit.
This current is detected as voltage at the feedback resistor.
NOTE) :During DEGAUSS, becomes Low level(D/A converter output voltage is 2.5V), therefore the current
doesn
’
t flow in the corner coil.
And it prevents magnetization in the CRT.
CRT face
EMF coil
Corner coil
TOP
LEFT
TOP
RIGHT
BOTTOM LEFT
BOTTOM RIGHT
CRT face
(The example of image: Correction of four corner purity)
Summary of Contents for MultiSync FP1370
Page 13: ...4 4 REMARK SYMBOL Mount the EMF PWB 121E REMARK SYMBOL Clamp the connector ...
Page 14: ...4 5 REMARK SYMBOL COIL FORMING UPPER SIDE REMARK SYMBOL COIL FORMING LOWER SIDE ...
Page 23: ...4 14 REMARK SYMBOL REMARK SYMBOL Clamp CN CA CN CC and CN D with CLAMPER WIRE ...
Page 26: ...4 17 REMARK SYMBOL Clamp the wires SAFETY REMARK SYMBOL Clamp the wires CN ASD CN AF 21 ...
Page 80: ...5 51 Fig 3 11 CONV PWB Fig 3 12 EMF PWB CN EMF CN LL CN RR CNEM CN CA CN D CN CCB HS8N1 ...
Page 143: ...8 18 15V 80V AFC D FOCUS Fig 3 1 HIGH VOLTAGE CIRCUIT AND PROTECTOR CIRCUIT ...
Page 260: ...10 1 ...
Page 261: ...10 2 ...
Page 262: ...10 3 ...
Page 263: ...10 4 ...
Page 264: ...10 5 ...
Page 266: ...for Human Potential ...
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