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CHAPTER 5. CIRCUIT DESCRIPTION
[1] Circuit description
1. General description
The compact design of the control PWB is obtained by using ROCK-
WELL fax engine in the main control section and high density printing
of surface mounting parts. Each PWB is independent according to its
function as shown in Fig. 1.
2. PWB configuration
TX/RX
MOTOR
LINE CABLE
TEL/LIU PWB
PANEL PWB
Fig. 1
1) Control PWB
The control PWB controls peripheral PWBs, mechanical parts, trans-
mission, and performs overall control of the unit.
This machine employs a 1-chip modem (R96DFXL-CID) which is in-
stalled on the control PWB.
2) TEL/LIU PWB
This PWB controls connection of the telephone line to the unit.
3) Power supply PWB
This PWB provides voltages of +5V, VREG and +24V to the another
PWB.
4) Panel PWB
The panel PWB allows input of the operation keys.
5) CCD PWB
This PWB controls the pickup optical device.
6) LCD PWB
This PWB controls the LCD display.
CCD PWB
AC CORD
POWER
SUPPLY
PWB
CONTROL
PWB
LCD PWB
3. Operational description
Operational descriptions are given below:
•
Transmission operation
When a document is loaded in standby mode, the state of the
document sensor is sensed via the 1 chip fax engine (XFCR-
MVP). If the sensor signal was on, the motor is started to bring the
document into the standby position. With depression of the START
key in the off-hook state, transmission takes place.
Then, the procedure is sent out from the modem and the motor is
rotated to move the document down to the scan line. In the scan
processor, the signal scanned by the CCD is sent to the internal
image processor and the AD converter to convert the analog signal
into binary data. This binary data is transferred from the scan
processor to the image buffer within the RAM and encoded and
stored in the transmit buffer of the RAM. The data is then con-
verted from parallel to serial form by the modem where the serial
data is modulated and sent onto the line.
•
Receive operation
There are two ways of starting reception, manual and automatic.
Depression of the START key in the off-hook mode in the case of
manual receive mode, or CI signal detection by the LIU in the
automatic receive mode.
First, the XFCR-MVP controls the procedure signals from the
modem to be ready to receive data. When the program goes into
phase C, the serial data from the modem is converted to parallel
form in the modem interface of the 1 chip fax engine (XFCR-MVP)
which is stored in the receive buffer of the RAM. The data in the
receive buffer is decoded software-wise to reproduce it as binary
image data in the image buffer. The data is DMA transferred to the
recording processor within the main control gate array 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 XFCR-MVP which is
assigned to control the motor rotation and strobe signal.
•
Copy operation
To make a copy on this facsimile, the COPY key is pressed when
the machine is in stand-by with a document on the document table
and the telephone set is in the on-hook state.
First, depression of the COPY key advances the document to the
scan line. Similar to the transmitting operation, the image signal
from the CCD is converted to a binary signal in the DMA mode via
the 1 chip fax engine (XFCR-MVP) which is then sent to the image
buffer of the RAM. Next, the data is 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 copying takes place as the
operation is repeated.
5 – 1
UX-510U/UX-510C/UX-500U
UX-500C/FO-1460U
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