Panasonic KX-F1200 Service Manual And Technical Manual page 102

KX-F1200 j
2-13. LED ARRAY
The LED ARRAY will light during transmission and copying as a light source to rucuynlze documeni cnarac[uf_, patteii_s, {Jr
graphics on a document.
It is also possible to light the LED ARRAY in the test mode.
Circuit Diagram
I I i
I I I I_
I
I I I
LED ARRAY
+24V ABOUT 10V (LED OFF)
I 0V (LED ON)
(_) IC401
Q401 _
_ 5V (LED ON)
0V (LED OFF)
MAIN BOARD
3. FACSIMILE SECTION
3-1. IMAGE DATA FLOW DURING FACSIMILE OPERATION
COPY (Fine, Super-Fine, Half Tone)
1) Line information is read by CCD, by way of route (_), it is inputted to IC404.
2) In IC404, data is adjusted to suitable level for A/D conversion at Analog Signal Processing Section, and by way ot route
(_ 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@, and by way of routes (_)and (_), it is stored in RAM as shading data.
3) Draft's information that is read by CCD is inputted to IC404 by way of route(_, and after adjusting to suitable level for A/D
conversion by way of route(_ draft's information is converted to A/D (8 bit), and it is inputted to Image Processing Sec
tion. The other side, the shading data which flows from RAM by way of routes (_and(_), it is inputted to Image Process
ing 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 (_) and (_ they are stored in RAM.
4) White/Black data stored as above description 3), by way of routes (_)and _ 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 (_)and it is printed out on re
cording paper.
Note: Standard; Read 3.58 times/mm
Fine; Read 7.7 times/mm
Super-Fine; Read 15.4 times/ram
Transmission
1) Same processing of COPY items 1) - 3).
2) Data stored in RAM of IC404 is outputted from IC404 by way of routes (_and (_)), and it is stored in system bus, and by
wa_] o4 route (_, it is stored in communication bu_er inside DRAM
(,10415,10,416).
3) While fetching data stored in communication butter
s_/nchronous
with modem, CPU (I0401) inputs data to modem along
route (_), 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 demodu-
lated to parallel digital data. Then the CPU (IC401) stores the data in the communication buffer DRAM (IC415,1C416)
along route (_.
2) Data stored in DRAM (IC415,1C416) is decoded by CPU (IC401) by way of route (_), and it is stored in DRAM
(IC415,1C416) by way of routes (_) and (_
3) Same processing of COPY item 4).
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