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3. INTRODUCTION:
MF700 is a 17" multisync color monitor. The horizontal frequency range is from 30khz to 70khz,
and the refresh rate is from 50hz to 160hz. The circuit includes four major parts, the power supply
circuit, the deflection circuit, the video circuit and the digital control circuit. is the function block
diagram.
A. POWER SUPPLY:
Transfer AC source to DC source that supply all the circuit power. It includes:
(1) +13.5V: For video pre-amp circuit, parts of horizontal and vertical deflection circuit.
(2) –11.6V: For vertical deflection circuit.
(3) +7.1V: For CRT heater.
(4) +55V: For B
(5) 10V: For u-p power
Fig 2 is the function block diagram of power circuit.
B. DEFLECTION:
Produce YOKE deflection current of horizontal and vertical, CRT HV and bias that makes
screen raster.
C. VIDEO:
amplify the video signal and add the signal to the cathode of CRT to produce video on the
screen.
D. DIGITAL CONTROLLOR:
With the EEPROM and PROGRAM, the micro-processor (uP) control all the picture
performance.
From the key control, the user can change the H-size, V-size, V-center, H-phase.
+
Boost circuit.
8
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