Panasonic KX-F910BX, Service Manual

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KX-F910BX
CIRCUIT OPERATION
4. FACSIMILE SECTION
4-1. IMAGE DATA FLOW DURING FACSIMILE OPERATION
COPY (Fine, Super-Fine, Half Tone)
(1) Line information is read by CCD, by way of route 1 , it is inputted to IC1.
(2) In IC1, data is adjusted to suitable level for A/D conversion at Analog Signal Processing Section, and by way of
route 2 it is inputted to A/D conversion (8 bit). After finishing A/D conversion, data is inputted to Image Processing
Section by way of route 3 , and by way of routes 4 and 5 , it is stored in RAM as shading data.
(3) Draft’s information that is read by CCD is inputted to IC1 by way of route 1 , and after adjusting to suitable level
for A/D conversion by way of route 2 , draft’s information is converted to A/D (8 bit), and it is inputted to Image
Processing Section. The other side, the shading data which flows from RAM by way of routes 6 and 7 , it is
inputted to Image Processing Section, and after finishing of draft’s information’s image processing, white is
regarded as “0” and black is regarded as “1”, and by way of routes 4 and 5 , they are stored in RAM.
(4) White/Black data stored as above description 3), by way of routes 6 and 8 , it is inputted to P/S converter. White/
Black data converted to serial data in P/S converter is inputted to Thermal Head by way of route 9 and it is printed
out on recording paper.
Note: Standard; Read 3.85 times/mm
Fine; Read 7.7 times/mm
Super-Fine; Read 15.4 times/mm
Transmission
(1) Same processing of COPY items 1) - 3).
(2) Data stored in RAM of IC1 is outputted from IC1 by way of routes 6 and 10 , and it is stored in system bus, and by
way of route 11 , it is stored in communication buffer inside RAM (IC3).
(3) While fetching data stored in communication buffer synchronous with modem, CPU inputs data to modem along
route 12 , where it is converted to serial analog data and forwarded over telephone lines via NCU Section.
Reception
(1) Serial analog image data is received over telephone lines and input to the modem via NCU section, where it is
demodulated to parallel digital data. Then the CPU stores the data in the communication buffer of RAM (IC3) along
route 12 .
(2) Data stored in RAM (IC3) is decoded by CPU by way of way of route 12 , and it is stored in RAM by routes 13
and 5 .
(3) Same processing of COPY item 4).