UX-P400DE/IT/SE/H
NX-P500DE/IT/FO-P600IT
3. Operational description
CHAPTER 5. CIRCUIT DESCRIPTION
Operational descriptions are given below:
[1] Circuit descriptionYTransmission operation
When a document is loaded in stand-by mode, the state of the docu-
ment sensor is sensed via the 1 chip fax engine (SCE209). With
1. General description
depression of the START key in the off-hook state, transmission takes
The compact design of the control PWB is obtained by using CONEXANTplace. Then, the procedure is sent out from the modem and the mo-
fax engine in the main control section and high density printing tor is of sur-rotated to move the document down to the scan line. In the
face mounting parts. Each PWB is independent according to its scan functionprocessor, the signal scanned by the CIS is sent to the internal
as shown in Fig. 1.image processor and the AD converter to convert the analog signal
into binary data. This binary data is transferred from the scan proc-
2. PWB configurationessor to the image buffer within the RAM and encoded and stored in
the transmit buffer of the RAM. The data is then converted from par-
allel to serial form by the modem where the serial data is modulated
MOTORand sent onto the line.
YReceive operation
TEL/LIUThere are two ways of starting reception, manual and automatic.
PWB
Depression of the START key in the off-hook mode in the case of
CIS
manual receive mode, or CI signal detection by the LIU in the auto-
matic receive mode.
CONTROL
PWBFirst, the SCE209 controls the procedure signals from the modem to
LCD
be ready to receive data. When the program goes into phase C, the
PWB
serial data from the modem is converted to parallel form in the mo-
POWERdem interface of the 1 chip fax engine (SCE209) which is stored in
SUPPLYthe receive buffer of the RAM. The data in the receive buffer is de-
PWB
coded software-wise to reproduce it as binary image data in the im-PANEL
INTERFACEAC CORD
age buffer. The data is DMA transferred to the recording processor
PWB
PWB
within the SCE209 which is then converted from parallel to serial
form to be sent to the thermal head. The data is printed line by line by
the SCE209 which is assigned to control the motor rotation and strobe
Fig. 1signal.
1) Control PWB
YCopy operation
The control PWB controls peripheral PWBs, mechanical parts, trans-To make a copy on this facsimile, the COPY key is pressed when the
mission, and performs overall control of the unit.
machine is in stand-by with a document on the document table and
This machine employs a 1-chip modem (SCE209) which is installed on
the telephone set is in the on-hook state. First, depression of the
the control PWB.COPY key advances the document to the scan line. Similar to the
transmitting operation, the image signal from the CIS is converted to
2) TEL/LIU PWBa binary signal in the DMA mode via the 1 chip fax engine (SCE209)
which is then sent to the image buffer of the RAM. Next, the data is
This PWB controls connection of the telephone line to the unit.
transferred to the recording processor in the DMA mode to send the
image data to the thermal head which is printed line by line. The
3) Power supply PWBcopying takes place as the operation is repeated.
This PWB provides voltages of Vreg(+5V) and +24V to the other PWBs.
4) Panel PWB
The panel PWB allows input of the operation keys.
5) LCD PWB
This PWB controls the LCD display.
6) Interface PWB
This PWB connect control PWB with panel PWB.
5 � 1 |
ACEC
