A.2.05 Network Control Unit (Ncu) - OKIDATA OF2600 Service Manual

Page: 156
Service Guide OF2200/2400/2600
Chapter A Board Diagrams

A.2.05 Network Control Unit (NCU)

Function
This board detects the OFF-HOOK condition, converts received analog data to digital signal levels,
generates dial pulses, and detects incoming ring signals when a ring signal of 20 Hz at 25 Vrms is input to
line terminals L1 and L2.
Firmware
NONE
Fuses
NONE
Jumpers
NONE
Sensors
NONE
Switches
NONE
Test Points
CN 7 Pin 1: GROUND
CN 7 Pin 13: +5 vdc
CN 7 Pin 14: +12 vdc
CN 7 Pin 15: -12 vdc