Sanyo VPC-E10 Service Manual

Also see for VPC-E10: Instruction manual

Contents

– 5 –1-2. CP1 CIRCUIT DESCRIPTION1. Circuit Description1-1. Signal processor1. γ correction circuitThis circuit performs (gamma) correction in order to maintaina linear relationship between the light input to the cameraand the light output from the picture screen.2. Color generation circuitThis circuit converts the CCD data into RGB signals.3. Matrix circuitThis circuit generates the Y signals, R-Y signals and B-Y sig-nals from the RGB signals.4. Horizontal and vertical aperture circuitThis circuit is used gemerate the aperture signal.1-2. AE/AWB and AF computing circuitThe AE/AWB carries out computation based on a 64-seg-ment screen, and the AF carries out computations based ona 6-segment screen.1-3. SDRAM controllerThis circuit outputs address, RAS, CAS and AS data for con-trolling the SDRAM. It also refreshes the SDRAM.1-4. SIOThis is the interface for the 8-bit microprocessor.1-5. PIO/PWM/SIO for LCD8-bit parallel input and output makes it possible to switch be-tween individual input/output and PWM input/output.1-6. TG/SGTiming generated for 10 million pixel CCD control.1-7. Digital encorderIt generates chroma signal from color difference signal.2. Outline of OperationWhen the shutter opens, the serial signals (“take a picture”commands) from the 8-bit microprocessor are input and op-eration starts. When the TG/SG drives the CCD, picture datapasses through the A/D and CDS, and is then input to theASIC as 12-bit data.The AF, AE, AWB, shutter, and AGC value are computed fromthis data, and three exposures are made to obtain the opti-mum picture. The data which has already been stored in theSDRAM is read by the CPU and color generation is carriedout. At this time, correction of the lens distortion which is acharacteristic of wide-angle lenses is carried out.After AWB and γ processing are carried out, a matrix is gen-erated and aperture correction is carried out for the Y signal,and the data is then compressed by JPEG and is then writtento card memory (SD card).When the data is to be output to an external device, it is takendata from the memory and output via the USB. When playedback on the LCD and monitor, data is transferred from memeryto the SDRAM, and the image is then elongated so that it isdisplayed over the SDRAM display area.3. LCD BlockThe LCD display circuit is located on the CP1 board, andconsists of components such as a power circuit and VCOMcontrol circuit.The signals from the ASIC are 8-bit digital signals, that isinput to the LCD directly. The 8-bit digital signals are con-verted to RGB signals inside the LCD driver circuit. The LCDis input signals from ASIC directly to the LCD, and functionsuch as image quality are controlled.In addition, the timing pulses for signals other than the videosignals are also input from the ASIC directory to the LCD.