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FCC ID: JVP7257C

Block Diagram

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FCCID_75007

7257C VIDEO BLOCK DIAGRAM DRIVE BIAS (FROM OSD IC) (From OSD IC) R G B RoG B OSD Mixer (From OSD IC ) R OSD DC Restore CKT G OSD Q121 Q141 B OSD Preamp CKT Q161 LM1279 IC101 VIDEO Cascode CKT —R (FromPc) _>® Q110,120 —o Q130,140 Q150,160 —B Gi CONTRAST (From uC 1C801) Brightness CKT: Q219 ABL CKT Change Mode Blanking:Q218 Beam Current (From FBT} V—blanking:Q221 Q316,323 H—pulse H—blank (From FBT) CKT Q321 3vVpP 72 7 C

7257€ DEFLECTION BLOCK DIAGRAM Video ABL & Contrast control ’___9 CKT Q316 Vertical blanking Q221 Brightness Q219 Spot killer & Change HV mode blanking Q218 H—blanking} FBT CKT Q321 T302 Vertical output T 1€202 H—center L301 Horizontal Driver & Output Q315, Q310 H—Linear RL301, Q314 Q334 AFC & X—ray protection H—size control Q302, Q303 H/V processor H—phase, V—size,V—center B‘control Pincushion & Trapzoid Step—up control 1C201 Q305, Q30 Q317 Unbalance & Parallelogram control Q201~0@204 Q207~Q214 Micom controller IC801

7257€ SWITCHING POWER SUPPLY BLOCK DIAGRAM Transformer w [mn fgee 3 § moe* Line Bridge Secondary DCV Recufi Cary — R}]fi(\;g;‘_g [F{L;C“fier’& & snubber ckt ier CKT ext sync PWM Feedback V—Syne Trigger controller CKT Betector photo coupler cont{ul wat J 4Y H—Syne EPS 1 Detector CKT 7257€C MICRO CONTROLLER BLOCK DIAGRAM MCUMTVI12) Detecting the — ; Hsync ~input sig%lals — glea%izng Vsync ~of H,Vsyne & ~ 5CO — SC2 V—polarity V—polarity. OSsD IC EEPROM NC : Display OSD Preset mode data. Searching for andpou}tlput User saved modedata. gllg;:rg;isz‘g/ed PWM to video with the input aiscuit signals and PWM To deflection get the data. output circuit Control Panel hi y Parecegreay Checking if the . eys npu valid key be pressed Exit Enter and do key function. PC Reset circuit (UART) External RS232 adjustment function auto alignment program 12MHz Crystal DDC1/2B circuit


Document Created: 2001-05-11 09:19:48
Document Modified: 2001-05-11 09:19:48
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