Samsung MA267 Series Service Manual page 8

1-3, Horizontal Output Stage 0603
0603 is horizontal output switching transistor which closed during the scan period and open duringthe
flyback. It receives drive signal from IC03 through transistor 0602 and horizontal drive transT601. C616
makes the necessary S-correction. Because of the losses in the deflection yoke, a linearity correction is
required. This is achieved by L603. The horizontal screen size can be varied by adjusting L602. The high
voltage of 13KV for CRT anode is also generated in flyback transformer by using f1yback pulse.
1-4, Dynamic Focus
0604(BUV46 or KSC5021) is used to provide dynamic fovus voltage which is added to G4 voltage of theCRT.
This voltage is need to change G4 voltage according to the angle of the beam.
1-5, Video Circuit
This circuit performs following functions.
Video input buffer(IC02 : 74LS266)
- Cascade amplifier(0103,0104,0801)
- Contrast control circuit (0102, 0101, VR1 01)
If only video signal input into the IC02, IC02 delivered to cascade amplifier(0104, 0801).
If only dual signal input into the IC02, IC02 delivered to cascade amplifier(0103, 0801).
CONTRAST CONTROL is operated by 0101, 0102, 0801, 0103, 0104 form a cascade video amplifier which
circuit output is applied to cathode pin of the CRT.
1-6, CRT Board
It contains video amplifier transistor 0801 and CRT socket.
1-7, Power Board
This board contains fuse.
IMPORTANT: When replacing the power supply, make sure that the green ground wire is properly attached
to the main chassis frame, and make sure that the fuae is of the same type and rating as original.
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