JVC AV-2771S Service Manual page 21

AV-2771S
%X Switching pin truth table (voltages)
TV / VIDEO input switching MTS mode switching PIP position control
Seiefe| Seale] GLele
(P47) (P46) (P45) (P44) (SBDO) | (SBTO)
z
=a
® pin-29 : non using
@MEMORY
ne Function iN? Function
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OUT name OUT name 7
Sheree ee Memory data (MODE) IL ce Notch on/off (on : [Notch onfoff(on:H)
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@|F - VIDEO - CHROMA - DEFLECTION PROCESSING CIRCUIT [in MAIN PCB Ass'y =1C201 : VC20242]
@ A single chip IC and peripheral circuits perform video, chroma and deflection(except output stage) signal processing.
The main IC functions are indicated below.
@ Video (juminance) system
e Black level compensation
° Delay line (for luminance only)
° 3.58MHz trap (notch)
° Contour compensation (delay line aperture control)
° DC restoration
° Pedestal clamp
¢ Adjustments (DETAIL, PICTURE, BRIGHT)
@ Chroma system
° 3.58MHz Band pass amplifire (BPA)
° Built-in filter response adjustment (swicthing)
° ACG
¢ Color killer
* Color synchronizer (PLL detection)
° Color demodulaton (R-Y, G-Y, B-Y)
° Adjustments (COLOR, TINT)
@ Sync. and deflection system
¢ Synchronization separator (horizontal / vertical)
¢ Horizontal and vertical oscillators (countdown system, non-adjustment)_
° Horizontal pre-drive
° Horizontal AFC
@ Other
¢ On-screen switch & drive
° Horizontal / vertical blanking
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