Eiki EK-400X, Service Manual, Page: 18 / 75

18
Digital video signal processing
*Scaler (U001)
• The RGB/YCbCr signals are processed for picture quality improvement and matrix
processing at the Scaler circuit.
• The output signals are switched over at the bus line after adjusting color space processing,
auto-adjustment, Degamma etc, these signals are written in the DDRII DRAM(U707).
• The image signals called up from the DDRII DRAM, pass through the definition converter
circuit, ON-screen display, error diffusion circuit for DLP, and output to the optical engine
unit (DLP DMD board).
Timing signal processing
Scaler operates on an external single 32MHz crystal.
Audio signal processing
• The pre-amplifier (U2003) is generated signals with volume control to audio amplifier(U22)
to driver speakers.
System control
The scaler(U001) controls all of this system.
− Built-in Lamp Ballast Control
− DMD Power and Reset Driver Control
− DMD horizontal and vertical Image Flip