KX-FT57E - Panasonic Fax Service Manual (repair manual). Page 126

|

127

|

(1) Line information is read the by the CCD, via  route 

@

 and is input to IC1.

(2) In IC1, data is adjusted to a suitable level for A/D conversion in the  Analog Signal Processing Section, and via route 

A

 it

is input to A/D conversion (8 bit). After finishing A/D conversion, the data is input to the Image Processing Section via
route 

B

. Via routes 

C

 and 

D

 , it is stored in RAM as shading data.

(3) The draft’s information that is read by the CCD is input to IC1 via route 

@

 , and after adjusted to a suitable level for A/D

conversion via route 

A

 , the draft’s information is converted to A/D (8 bit) and it is input to the Image Processing Section.

For the other side, the shading data which flows from the RAM via routes 

E

 and 

F

 is input to the Image Processing

Section. After finishing the draft’s information image processing, white is regarded as “0” and black is regarded as “1”. Via
routes 

C

 and 

D

 they are stored in RAM.

(4) The white/black data stored as above via routes 

E

 and 

G

 is input to the P/S converter. The white/black data converted to

serial data in the P/S converter is input to the Thermal Head via route 

H

 and it is printed out on recording paper.

Standard:

Read 3.85 times/mm

Fine:

Read 7.7 times/mm

Super-Fine:

Read 15.4 times/mm

Transmission
(1) Is the same processing as COPY items 1) - 3).
(2) Data stored in RAM as IC1 is output from IC1 via routes 

E

 and 

I

 , and is stored in the system bus. Via  route 

J

 , it is

stored in the communication buffer inside the RAM (IC3).

(3) While retrieving data stored in the communication buffer synchronously with the modem, the CPU inputs the data to the

modem along route 

K

 where it is converted to serial analog data and forwarded over the telephone lines via the NCU

Section.

Reception
(1) Serial analog image data is received over the telephone lines and input to the modem via the NCU section where it is

demodulated to parallel digital data. Then the CPU stores the data in the communication buffer of the RAM (IC3) along
route 

K

 .

(2) Data stored in the RAM (IC3) is decoded by the CPU via of route 

K

 , and is stored in the RAM  by routes 

L

 and 

D

.

(3) Is the same processing as COPY item 4).

LED ARRAY

MAIN BOARD

5V (LED ON)
0V (LED OFF)

+24V

ABOUT 10V (LED OFF)
0V (LED ON)

IC1

62

IOP26

IC7

16

1

The LED ARRAY will light during transmission and copying as a light source to recognize document characters, patterns, or
graphics on a document.
It is also possible to light the LED ARRAY in the test mode.