Pca-Wm-Db Board; Pca-Cnct-R Board; Pca-Dcdc Board; Pca-Bat Board - Canon CXDI-80C Service Manual

The power switch provided on the detector can be used to perform the operations of power
ON/OFF and infrared communication so that the detector is recognized by the image capture
computer. The functions concerned with the detector power are described below.
(1) Standby mode
Power is supplied to the PCA-FE2 board inside the detector when the battery pack is installed in
the detector or the wiring unit is connected. In this mode, only the main power control circuit
that monitors the power switch on the PCA-FE2 board is powered and operated, and the power
switch input is awaited.
(2) Power ON
When the main power control circuit detects that the power switch of the detector has been
pushed down all the way (tap the switch for infrared communication; push it down all the way
to turn on the power) for one second, power begins to be supplied to the other circuits, and the
system operation mode is established.
(3) Power OFF
The power is turned off from the power-on mode as follows: When the firmware detects that the
power switch on the main unit of the detector has been held down all the way for five seconds,
the shutdown process is initiated, after which the power is turned off.
The power OFF function described above works both when power is supplied by the battery and
when power is supplied by the wiring unit.

1.3.3 PCA-WM-DB board

This board contains the wireless LAN control IC that supports the IEEE 802.11n standard, and
it relays the data which has passed through the access point from the image capture computer
and X-ray interface box to the PCA-FE2 board through the antenna.
This board meets the IEEE 802.11n standard in order to achieve a data transfer performance of
around 50 to 60 Mbps. This standard is a wireless LAN standard established by the IEEE 802
Committee of the United States, and although the 11a, 11b and 11g standards were already in
place, this new high-speed wireless LAN standard was added to them.
1.3.4 PCA-CNCT_R board
This board is used when establishing a wired connection using the detector cable (option) for
the wiring unit. It relays the data from the image capture computer and X-ray interface box to
the PCA-FE2 board and enables power to be supplied to the PCA-DCDC board.

1.3.5 PCA-DCDC board

This board generates the power used by the boards inside the detector from the battery or a
single power supply which is input from external power source. Its main functions are described
below.
(1) It generates the power used for the PCA-REF-136 board and PCA-FE2 board from the
battery or external power source.
(2) It controls the ON/OFF of the analog power supply used for the PCA-REF-136 board and
monitors the voltage.
(3) It exercises DC/DC synchronized control using the signals which are supplied from the
FPGA on the PCA-FE2 board.
(4) It detects the external power input, and switches the power supply.
(5) It provides protection from overcurrents.
(6) It relays the battery installation detection and signal between the battery and PCA-FE2 board.

1.3.6 PCA-BAT board

This board relays the power and communication control signals between the battery and PCA-
DCDC board, and contains the start program selector switch (hereafter referred to as the boot
switch).
3 . Description of Functions
3 .
- 4 -