Signal Flow - Sanyo SFX-110 Service Manual

9-3. SIGNAL FLOW
Mode signal Flow
(A) Transmission
,+8
FIFO
DOCUMENT
"n
FAX
MODEM
C.1.s \
Engine ~
Perifery
TEL LINE
4
D"
Ml \
NCU
I
1
M3
1
The image data of the original, conveyed through the reading mechanism, and is ready by contact image
sensor (CIS). This is amplified and is turned into black and white or halftone signals through the LSI (FAX
Engine IC1O).
This signal is written into the line memory (inside of ICI O).
The LSI (CPU-IC1 O) encode the contents of line memory.
After encoding, the coded data is stored in the FIFO (IC2).
Further the CPU (ICI O) sends the one byte data in the FIFO (IC2) to the MODEM (IC1 O), synchronizing with
the interrupt signal from the MODEM (IC1 O).
Through repetition of this operation, the image data for each line
IS
encoded arm modulated through the
MODEM (IC1O), and transmitted over the line through the NCU (M3 P.W.B.).
(B) Reception
TEL LINE
"n
NCU ;
~ "m
MODEM
Periphery
M3 ~
t
1
1
1
FAX
I
1
Thermal
FIFO
1
I
+
Ml
Engine
1 Head
1
1
1
I
1
This signals received from the LINE enter the MODEM (IC1 O) through the NCU.
In the same manner as in transmission, the coded data which is modulated in the MODEM is stored in the
FIFO (IC2) with an interruption for each interrupt from the MODEM (IC1 O).
The LSI (IC1O) reads out and decodes the data from the FIFO (IC2), and out put to the Thermal Head
Printer.
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