Ncu Board - Canon FAXPHONE L75 Service Manual

LASER CLASS 1060P Chapter 2: Technical Reference
b) G3 Reception
(1) Image signals received by L1, L2, pass through the hybrid circuit in the NCU, and are amplified. The
modem demodulates these image, and writes them to the DRAM.
(2) The MPU decodes the demodulated image data, checks errors, stores it in the DRAM, encodes the data
and rewrites it into the DRAM.
(3) After one page is received, the encoded data in DRAM is decoded by the system controller IC.
(4) The system controller IC then converts the resolution of the fax data to the appropriate resolution for
the printer data, and send it to the printer controller IC on the PCNT board.
(5) The printer controller IC prints data by controlling the main motor, LASER, and high voltage accord-
ing to the received print data.

NCU board

Figure 2-10 G3 Reception Image Signal Flow
(1)
a
d
(3)
b
2-20
c
(2)
(4)
PCNT board
(5)
Printer section
a MODEM IC
b DRAM
c MPU
d
System controller IC