AJ-5030U/C
3. Operational description
CHAPTER 5. CIRCUIT DESCRIPTION
Transmission, reception, copy, and PC print operations are described
below.
[1] Circuit descriptionYADF transmission
1When a document is set, the front sensor is turned on and "SEND
1. General descriptionREADY" is displayed.
The compact design of the Control PWB is obtained by using Risc Proc-2 If the START key is pressed in the off-hook state (the speaker phone
key has been pressed), the analog signal path is put into the trans-
essor (CPU) in the main control section and high density printing of
mission state and transmission to the other party's machine is started
surface mounting parts. Each PWB is independent according to its func-
tion as shown in Fig. 1.via the modem (FM214:IC16).
3The document is fed until the document sensor (ORG sensor) is turned
on, and then to the reading position. From that position, the docu-
2. PWB configuration
ment is read and fed simultaneously.
This circuit consists of the following 6 PWBs.4CCD control signals are output from the main controller
(MFC2000:IC18) and the CCD sensor outputs analog video signals.
LINE
SCANNERFEEDCARRIAGIn this state, the illuminant of CCD lights up 3 colors of RGB simulta-
MOTORMOTORMOTOR
PANEL PWBCCD PWBneously. Three-colored analog video signals of CCD are output to
MMMthe amplifying circuit in the order of red, green, and blue, being con-
trolled by the color selection signals.
5Amplified analog video signals are converted to digital signals by the
LCD PWB12-bit ADC installed in MFC2000 (IC18), and transferred to SDRAM
(IC24) of work memory for image processing in DMA.
6Image data of SDRAM is put through various processes such as
CONTROL PWB
shading correction, g correction, conversion of resolution, inversion,
and black binzarization by DSP installed in MFC2000, and then it is
transferred to the line memory of DRAM (IC19) in DMA.
7If binarization from the work memory, conversion of resolution, and
PRINTERtransfer of bi-level image to the line memory overrun, the scanner isSPEAKERCARRIAGE
stopped and the reading operation is interrupted. When some space
is available in the memory, the document is read from the stopped
point and fed.
8Along with the operations in steps 4, 5, and 6 above, CPU of
POWER
SUPPLYLIU PWBMFC2000 transfers data from the line memory area in DRAM to its
PWB
built-in compression/expansion circuit to encode MMR. During
memory transmission, data coded by MMR is saved in the flash
Fig. 1
memory until reading is completed.
1) Control PWB9Coded data is recoded in MMR, MR, or MH in accordance with the
capacity of the other party's machine, and is stored in the transmit
The Control PWB controls the whole device including other peripheral
buffer area in DRAM.
PWBs.
FAccording to the interrupt of coded data transfer request of the mo-
dem, coded data is sent from the DRAM transfer buffer to the mo-
2) LIU PWBdem.
The LIU PWB connects phone lines by using control signals from theGTransmission/reception can be continued or terminated depending
Control PWB.on the sensor, key input, and procedure.
Y BOOK transmission
3) Panel PWB1If the BOOK key is pressed in the off-hook state (the speaker phone
This PWB is provided with the key input section and ADF documentkey has been pressed), the analog signal path is put into the trans-
sensor.mission state and the transmission to the other party's machine is
started via the modem (FM214:IC16).
2The scanner is moved to the document reading position.
4) CCD PWB
3CCD control signals are output from the main controller
This PWB consists of CCD, analog circuits around it, and color data(MFC2000:IC18) and the CCD sensor outputs analog video signals.
selection circuits of CCD.In this state, the illuminant of CCD lights up 3 colors of RGB simulta-
neously. Three-colored analog video signals of CCD are output to
the amplifying circuit in the order of red, green, and blue, being con-
5) Power supply PWB
trolled by the color selection signals.
This PWB supplies 5V and 24V to the Control PWB.4Amplified analog video signals are converted to digital signals by the
12-bit ADC installed in MFC2000 (IC18), and transferred to SDRAM
(IC24) of the work memory for image processing in DMA.
6) LCD module PWB
5Image data of SDRAM is put through various processes such as
This PWB consists of the LCD panel and LCD controller.shading correction, g correction, conversion of resolution, inversion,
and black binzarization by DSP installed in MFC2000, and then it is
transferred to the line memory of DRAM (IC19) in DMA.
6If binarization from the work memory, conversion of resolution, and
transfer of bi-level image to the line memory overrun, the scanner is
stopped and the reading operation is interrupted. When some space
is available in the memory, the scanner is slightly moved back and
restarts reading by moving itself forward.
7Along with the operations in steps 3, 4, and 5 above, CPU of
MFC2000 transfers data from the line memory in DRAM to its built-in
compression/expansion circuit to encode MMR. During memory trans-
mission, data coded by MMR is saved in the flash memory until the
reading operation is completed.
5 � 1 |
ACEC
