Ricoh LD013, Service Manual

Page: 221 / 513

IMAGE PROCESSING
B039/B040/B043 6-28 SM
6.1.5 IMB (MEMORY CONTROLLER AND DRAM)
The functions of the these two IMB component devices are as follows:
Memory Controller: Compression of the 1-bit image data
Image rotation
Image data transfer to the DRAM
DRAM (16MB): Stores the compressed data
Processing area
The data goes to the memory controller after binary picture/grayscale processing.
The data is first compressed and then stored in the DRAM. For printing, the data
from the DRAM goes back to the memory controller, where it is decompressed and
goes through image editing (e.g., image rotation, repeat image).
When the 16 and 32 MB memory is installed on the BiCU board, the memory
capacity changes as follows:
A4 size, Text mode (Number of pages)
0 MB 16 MB 48 (16+32) MB
A4 6% 0 71 99
ITU-T#4 (12% black) 0 34 99
NOTE: The amount of standard memory depends on the model:
B039: North America (16MB standard), Others (no standard memory).
B040, B043: 16MB standard.