Awesome manual. Complete diagrams of all board assemblies as well as how to get to each part of the t.v. down to the individual screws and their locations. Get it.
This is exactly the service manual I needed.
Complete with all schematics, partslists, PCB layouts and alignment instructions.
This manual covers both the T-4970 en T-488F Onkyo tuner.
Text excerpt from page 34 (click to view)
IMAGE PROCESSING
22 December 1998
Gamma (γ) Correction γ The gamma curve corrects the response of the CCD to grayscales in the original. Grayscale Processing This process generates up to 256 image density levels for each pixel. Dithering Dither processing produces good quality grayscale images of photo originals. Error Diffusion The error diffusion process reduces the difference in contrast between light and dark areas of a halftone image. Each pixel is corrected using the difference between it and the surrounding pixels. The corrected pixels are then compared with a matrix table. Binary Picture Processing Each video signal level is converted from 8-bit to 1-bit (black and white image data) in accordance with a threshold value. White/Black Conversion
Inverts the image (converts from white to black and vice versa).
After video processing, the data goes to the host computer through the memory and SCSI controllers.
