Summary of Product
4.3.1 ASIC (Chorus2)
The Chorus2 (16Bit RISC Processor) ASIC is the main processor controlling the whole system. It controls all of the printing and scanning functions using a system program stored in flash memory.
•Main function block
•Completely Integrated System for Embedded Applications,
•16/32 Bit Risc Architecture, Efficient and Powerful ARM7TDMI CPU
•LSU Interface Module for Interfacing PVC with LSU
•5 Channel General Purpose DMA Controller for High Speed I/O
•Dual Memory Bus Architecture
•Operating frequency : 66MHz
•Operating power : 1.8V(internal), 3.3V(external)
4.3.2 Flash Memory
This stores the system program. Firmware upgrade is achieved by downloading from the new image using the PC Interface.
•Capacity : 1M Byte
•Access Time : 70 nsec
4.3.3 SDRAM
This is used as a buffer, system working memory area, etc. while printing and scanning.
• Capacity :
8 M byte
•Access Time : 15 nsec
4.3.4Sensor input circuit
1) Paper Empty Sensing
The Paper Empty sensor (Photo Interrupter) on the SMPS/HVPS PBA is monitored by the CPU. When the cassette is empty the printer displays a message on the LCD panel.
2) MP Sensing
Presence of paper in the MP tray is detected by operation of the MP Sensor (Photo Interrupter) on the SMPS/HVPS PBA. The CPU monitors this signal to recognize paper in the MP, and paper is fed from MP if there is paper present.
Service Manual
Samsung Electronics
