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Model No: 21SHS3-CE.doc
Version 1.0
HORIZONTAL AND VERTICAL CIRCUIT
Through Synchronous separating circuit, the video signal is divided into horizontal-Synchronizing
signal and Vertical-Synchronizing signal. The horizontal-Sync pulse coming from pin 33 is transferred
to the horizontal-drive transistor.
The cathode driving voltage 180V vertical drive v15V and –15V are all generated from
FBT.
The vertical sawtooth waveform is generated on the pin 21 and 22, and then enters the vertical
amplifier STV9302A. STV9302A is a 7 pins vertical deflection circuit (2 Amperes) for DC-coupled
90° or 110° deflection systems with frame frequencies from 50 up to 120 Hz. one supply voltage for
the scanning and second voltage supply for the flyback are needed.
The vertical drive currents of OM8370 pins 21 and 22 are connected to input pins 1 and 7 of
STV9302A. The vertical scanning output is coming from pin 5 and feed back to pin 1 by R405. The
supply voltage is
±
15V at pin 2 and pin 4. C406 is the pump capacitor.
POWER SUPPLY
The IC of KA5Q0765RT is adapted in this chassis; it is the product of Fairchild. It supplies four DC
voltages, one is the +B
=
110V, another is Hcc
=
26V, the third is 13V (the sound drive voltage), the
fourth is +16V. The +16V can generate the +8V, +5V and +3.3V by the special generators.
Summary of Contents for 21SHS3 Series
Page 18: ...18 Model No 21SHS3 CE doc Version 1 0 IC BLOCK DIAGRAM Fig 1 OM8370 Illustration...
Page 21: ...21 Model No 21SHS3 CE doc Version 1 0 Fig 2 HEF4052BP Illustration...
Page 23: ...23 Model No 21SHS3 CE doc Version 1 0 IC N402 VERTICAL OUTPUT LA78040 or STV9302...
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Page 36: ...36 Model No 21SHS3 CE doc Version 1 0 Fig 4 AN7522N Illustration...
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Page 39: ...39 Model No 21SHS3 CE doc Version 1 0 Fig 5 KA5Q0765RT Illustration...
Page 43: ...43 Model No 21SHS3 CE doc Version 1 0 EXPLODED VIEW AND PART NAME...
Page 61: ...61 Model No 21SHS3 CE doc Version 1 0 CIRCUIT DIAGRAM...