Circuit Description; Circuit Description Of Each Board; At-196 Board; Cn-3958 Board - Sony HXCU-FB80 Service Manual

This unit consists of the boards described below.

• AT-196 board

• CN-3958 board

• CN-3968 board

• CN-3972 board

• CN-3985 board
• DPR-386 board
• LED-544 board
• LED-545 board
• PS-934 board
• SW-1736 board
7-1.

Circuit Description of Each Board

7-1-1. AT-196 Board
The AT-196 board mainly consists of system control, LAN connection, optical transmission, and 4K Upscale processing
circuits and contains the following interface connectors.
• SDI connector (for SDI input/output)
• RJ-45 connector (for LAN interface)
• Memory Stick interface (for service only)
This board is secured to the rear panel and is connected to the DPR-386 board with a flexible flat cable (45 pin) and a
fine-wire coaxial cable (50 pin).
7-1-2. CN-3958 Board
The CN-3958 board contains the following connectors to relay the following signals processed on the DPR-386 board.
• VBS out 1/2 (BNC × 2)
• PIX out (BNC × 1)
• SYNC out (BNC × 1)
• RETURN VIDEO in 1/2 (BNC × 2)
• AUDIO out 1/2 (XLR 3 pin × 2)
This board is directly secured to the rear panel and is connected to the DPR-386 board through a 45-pin flexible flat
cable.
7-1-3. CN-3968 Board
The CN-3968 board is connected to the AT-196 board and the PS-934 board from an 8-pin REMOTE connector for
connection to the remote control panel.
A panel power voltage of about 26 VDC is supplied from the PS-934 board. An overcurrent protection circuit is provided
on the PS-934 board.
Command signals with the panel are processed by the AT-196 board.
7-1-4. CN-3972 Board
The CN-3972 board contains a D-sub 9-pin connector for TRUNK LINE interface and an RS-422A/RS-232C driver
circuit (IC004) and is connected to the DPR-386 board through a flexible flat cable.
HXCU-FB80
Section 7

Circuit Description

7-1