A30 Front Panel Board - Tektronix RTX100A Service Manual

RF Matching Attenuator

A30 Front Panel Board

Front-panel Key Interface
and LED Control
LVDS Receiver for FPD
Link
Video Inverter Circuit
A35 Power Switch Board
A40 AC Distributer Board
A50 Disk I/F board
RTX100A ISDB-T RF Signal Generator Service Manual
This block steps down an RF output level to the antenna input level of a receiver
and matches the impedance with 75 Ω.
The A30 Front Panel board consists of the front panel processor circuit, LVDS
receiver for FPD (flat panel display) link, video inverter circuit, rubber contact
switches, three connectors, and three LEDs.
The state of the front-panel keys are read by the one chip processor on the board
and any setting changes are reported to the SBC through COM2. The processor
also controls the LED on/off state.
The LVDS receiver converts the four LVDS data streams back into 28 parallel
bits of CMOS/TTL data (24 bits of RGB and 4 bits of Hsync, Vsync, DE, and
CNTL).
The video inverter circuit consists of an FPGA and SRAM. The circuit converts
the display data upside down because the LCD display is attached to the chassis
upside down.
The A35 Power Switch board is connected to the A20 PCI Backplane board
through the A30 Front Panel board. There are two USB connectors on the board
that are directly connected to the USB2.0 interface connector on the CPU board.
The board also has the power supply module for the LCD back light.
The A40 AC Distributer board supplies standby power (5VSB) to the SBC and
the ATX power control circuit on the A20 Backplane board.
The A50 disk I/F board connects the secondary IDE connector on the CPU board
with the DVD drive module.
Theory of Operation
2-5