Instruction manual
Hardware Overview
16 025-9416
* Optional Boards for the Model 640
10
9
7
6
8
5
4
1 MB SIMMs
“DRAM”
Volatile
Memory
3
Power
Supply
Module
1
Parallel Printer Card *
Spare Card Slot
RAM Disk Board
ROM Disk Board
TNPP Card *
Dual Trunk Card - Trunks C & D
Dual Trunk Card - Trunks A & B
Peripheral
Mother
Board
Main Processor
Board
2
Figure 2. Top View of Model 640 Chassis
Dual Trunk
Serial Ports
Fuse
AC Power
Connector
Adjustment
Pots
Trunk & Radio
Station Interface
FAULT
Connector
KEYBOARD
Connector
Local
COM Port
13
11
17
15
14
12
18
16
Figure 3. Rear View of Model 640 Chassis
OPERATING POWER
The internal power supply (item #1, Figure 2) in the Model 640 operates from 115V
AC
(item #12,
Figure 3) and provides all internal operating voltages, including the 48 volt supply for DID tele-
phone trunks. A power supply configured for 240V
AC
operation may be ordered as an option.