Sony PMW-EX3 Service Manual page 17

Main functions of the system controller and
peripherals
(1) Reading operation switch information
Reading the switch information and the LED control
are performed by I 2 C bus communication with each
sub-microprocessor.
. Handle switch: IC100 on the KSW-54 board
. Inside panel front switch: IC601 on the SWC-48
. Rear panel switch: IC106 on the ASW-66 board
. Power supply switch: IC1001 on the RE-261 board
(2) Watch IC (RTC) control
The watch IC (IC50) is built onto the AU-318 board.
The watch IC (IC50) is backed up by a lithium coin
battery, and the current time is read or set via IC601 on the
SWC-48 board.
(3) Infrared remote control demodulation
The RM-214 board has an IC (IC1) for infrared remote
control signal demodulation, and it receives the command
codes via IC100 on the KSW-54 board.
(4) Info-Battery communication
The Info-Battery of SM bus specifications is supported.
The serial terminal of the battery connector is connected to
IC1001 on the RE-261 board. This IC1001 reads the
battery authentication, battery type, remaining power, and
other information and send them to the system controller
2
via I C bus communication.
(5) Power supply voltage detection
The power supply voltage at the DC IN connector is
measured by the A/D port on IC1001 on the RE-261 board,
and it is posted to the system controller as the input voltage
value.
(6) Power system control
IC1001 on the RE-261 board checks that the power switch
on the PMW-EX3 is turned ON, and turns on the system
controller of IC1600. After that, it controls the power for
each circuit block according to the system controller.
The system controller controls the respective power supply
systems in the RE-260 and RE-261 boards according to the
operation mode of the device, via the power supply u-
processor on the RE-261 board.
By turning off the power systems to unnecessary circuits
blocks, power can be saved.
PMW-EX3
board
(7) 700P communication
The serial communication driver (IC803) is mounted on
the TX-129 board.
Serial communication with the remote control unit con-
nected to the REMOTE connector is performed.
7. SDI/GENLOCK/TC IN/TC OUT
TX-129 board
(1) SDI output
This board receives the parallel video signal with FPGA
(IC100) and IC500 and outputs the SDI signal.
Furthermore, it performs audio or timecode embedding.
The video and audio signals are supplied from CN400 on
the DPR-289A board to CN100 on the TX-129 board with
a 0.4 mm pitch, 40-pin fine coaxial cable.
The power voltages are supplied from CN401 on the DPR-
289A board to CN700 on the TX-129 board with a 15-pin
harness.
Output SDI signals are supplied to CN500.
Output SDI signals are then supplied from CN500 to the
coaxial connector via the mini coaxial connector and mini
coaxial cable.
The PLL circuit is used to reduce jitter of the HD-SDI
clock signal.
The FPGA (IC100) is controlled by IC400 on the DPR-
289A board through 4-line serial communication.
The FPGA program is stored in the IC203 ROM, and
JTAG can be used to overwrite the data from IC1600 on
the DPR-289A board.
When not using SDI, the power to cable driver inside
IC500 is turned off.
(2) GENLOCK
In IC902, sync signal separation is performed for GNE-
LOCK. The separated sync signal enters IC400 on the
DPR-289A board where phase is compared by the internal
counter of IC400 and by IC521 to control the VCXO
(X500).
(3) TC IN/TC OUT
IC900, IC901, and IC907 reshape the waveform of the
time code connected to the TC IN connector and input it to
IC100.
IC903 is the external output circuit for the time code OUT
signal, which outputs the signal to the TC OUT connector.
They communicate with the FPGA (IC100) through the 4-
line serial interface on the DPR-289A board.
1-9