Caple C702G Instrukcja Obsługi Pobierz pdf (Strona 188)

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12. AUTO ADJUST CIRCUIT

By detecting video signal, AutoAdjust function adjusts size and position. MPU has several standards of

frequency, active ratio and so on. MPU compares measurement data and with their standards, and calculates

adaptive size and position data and sets them.

IC8M1 is video detecting IC. It measures following data.

H.trace.time, H.disp.time, H.front.porch, H.back.porch

V.total.time, V.disp.time, V.front.porch, V, back.porch

That means AutoAdjust function can't work correctly in the cases as follows.

a. No signal (ex. All black)

b. Too narrow active ratio (ex. 1/3 window)

c. Animation (ex. movie, game)

d. Too dark

If Animation, sometimes AutoAdjust function can detect video signal and sometimes can't. As a result

AutoAdjust function can't work stably.

A blinking picture is worst case.

MPU

(IC801)

Video

Pre-Amp

Vertical

Deflection

Circuit

Video Signal

V_PUMP

AFC_TTL

Horizontal

Deflection

Circuit

Auto Adjust

Circuit

(IC8M1 QFP32)

(Fig.12.1) Auto Adjust Circuit Block Diagram

1 2 ... 183 184 185 186 187 188 189 190 191 192 193 ... 285 286

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Caple C702G Instrukcja Obsługi Strona 188