Larc2; General Description - Lexicon 960L Service Manual

Larc2

This section describes the theory of operation of the LARC2 main board and related modules. Refer to
Lexicon schematic 060-13379.

General Description

The LARC2 is the remote control unit for the Lexicon 960L Digital Effects System. LARC2 provides easy
access to all of the 960L functions and parameters. A thin cable provides a direct link with the mainframe
from up to 50 feet away or up to 1000 feet with an external12VDC power supply.
The LARC2 system board contains the following standard components:
Intel SA-1100 Processor
64KBytes Boot ROM
8 Mbytes of Flash
16 Mbytes of EDO DRAM
Control for 8 motorized faders
Control for an 640 x 240 LCD display
Keypad and serial interfaces
Diagnostic LEDs
UDC -
Channel0
USB
UDC +
(Not Used)
RXD 1
Channel 1
RS422
TXD 1
(Host)
LD[7:0]
LCD
4
640 x 240
SA-1100 CPU
Inverter
Address [25:0]
Data [31:0]
Buffers
8 MByte
FPGA
DRAM
8 8
LEXICON
10 Bit A/D 10 Bit A/D
8 Wipers
Motor Drivers
JoyStick
M1 M2 M3
Figure 1-1 LARC2 Block Diagram
TXD 2
RXD 2
TXD 3
RXD 3
TXD C
RXD C
10
Boot FLASH
Meter Bridge (12)
Keypad Backlight
Keypad
8 Touch Controls
2 VDC
3.3 VDC Power
Supply
5 VDC
M4 M5 M6 M7 M8
Channel 2
IrDA
(not used)
Channel 3
RS232
Debug
Channel 4
CODEC
(not used)
PCMCIA 2
SOCKET
(optional)
PCMCIA 1
8 MB FLASH
(on board)
PS2
(Keyboard)
Ext In
12V In
Lexicon
7-39