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1.2.6 DBF (Dynamic Beam Focus) circuit
The horizontal/vertical DBF voltage is respectively generated and amplified, then synthesized at T7A1.
As for the horizontal DBF voltage waveform, the parabola waveform voltage (approx. 0.5Vp-p) is output
with IC601, and amplified about 10 times with OP-AMP IC6A2. After that, it is amplified to 50-60Vp-p
with Q7B5 (the amplification factor is about 10 times), then it is amplified about 10 times with T7A1.
On the other hand, as for the vertical DBF voltage waveform, the parabola waveform voltage (approx.
1.0Vp-p) is output from IC601. It is amplified about 40 times at Q7A1, and the vertical parabola wave is
superposed to the horizontal parabola wave on the secondary side of T7A1, then consequently
synthesized. The collector pulse voltage of the high voltage output TR (Q701) rectified at D7A1 and
C7A1 is used for the power source of Q7A1. The synthesized DBF waveform is input to pin 12 of T701.
Summary of Contents for DPro2070SB
Page 22: ...1 15 Fig 7 The principle of DDCC compensation ...
Page 23: ...1 16 Fig 8 a DDCC adjustment item ...
Page 24: ...1 17 Fig 8 b DDCC adjustment item ...
Page 25: ...1 18 Fig 9 DDCC circuit diagram ...
Page 103: ...4 Wave form 1 POWER 2 CONTROL MAIN 3 DEFL MAIN 4 DEFL SUB COIL DRIVE MAIN 5 VIDEO ...