Ksu Components; Replacing A 408 M / E - Comdial DX-80 Installation & Maintenance Manual

KSU Components

KSU1 408M and KSU2 408E
The 408M module is installed at the factory into KSU1. Although this module has the same port
configuration as the 408E, they are not interchangeable. Each 408M and 408E is equipped with 4 CO Line
Ports, 1 Power Failure Port, and 8 Digital Extension Ports. See the following diagram to locate the various
ports provided on the 408M/E.
The 408M/E is also the interface point for the various add-on modules of the DX-80 system. All peripheral
modules connect to the DX-80 via the 408M/E.
connectors.
APM4 ribbon
connector (J4)
Voice Processor
Power Connector
Extension Expansion module
connectors.
DPM8 or APM4
Eight Digital
Extension Ports.
KSU1: 101-108
KSU2: 125-132

Replacing a 408 M / E

Occasionally, when instructed to do so by a Comdial technical support representative, it may be necessary to remove
a 408M or 408E and replace it in the field. Do this by following the steps below.
1. Be sure that KSU power is turned off.
2. Remove the KSU cover (four screws at each corner).
3. Connect grounded wrist strap to a suitable earth ground. (If a grounded wrist strap is not available, bleed
any static charge from your body before touching circuit modules by touching the gold-painted surface of the
inside of the KSU cabinet. If the KSU is properly grounded this will momentarily discharge static electricity
from your body. NOTE: A GROUNDED WRIST STRAP IS THE ONLY METHOD OF ASSURING THAT
STATIC CHARGE DOES NOT DAMAGE CIRCUIT MODULES.)
4. Remove all circuit modules from the KSU cabinet. All modules are fastened in place using standoff
hardware. Notice: be sure that stand off placement is re-constructed when the various modules are re-
P7290 IMM
DX-80 I M
NSTALLATION AND AINTENANCE
See Diagram X as a reference of the various interface
COM4 ribbon
connector
J2
2-7
M 03/01
ANUAL
408M: CPM ribbon cable
408E: CPM connector cable
(approximately one meter
long to extend out of KSU2
into KSU1)
Power Failure
Transfer Port.
KSU1: 740
KSU2: 748
J3
Four CO Line
circuits.
KSU1: 740~743
KSU2: 748~751