Replacing A 408M Or 408E; Ksu Assembly - Add-On Modules - Comdial DX-80 Technical Manual

Installing the DX-80

2.7.2 REPLACING A 408M OR 408E

Occasionally, when instructed to do so by a Comdial technical support representative, you may have to
remove a 408M or 408E and replace it in the field. To do so, use the following the steps.
1. Be sure that the entire system is turned off.
2. Remove the KSU cover (four screws at each corner).
3. Connect a static discharge wrist strap to a suitable earth ground. Be sure that the strap is touch-
ing bare skin.
Circuit boards are susceptible to damage caused by electrostatic
discharge. You must keep this in mind as you handle the circuit
boards. Refer to Comdial publication IMI01-005, Handling of Electrostatically
4. Remove all circuit modules from the KSU cabinet. All modules are fastened in place using
standoff hardware, therefore, be sure to reconstruct these stand off placements when you re-
install the various modules. Note: APM4 modules must be installed using 2.5 cm stand offs.
These specific length standoffs are steel color for easy identification.
5. Install the replacement 408M/E using the brass (1.5cm) standoffs removed from the original.
6. Install all other remaining modules in the order that they were removed, connecting them to the
appropriate 408M/E connector.
7. Reconnect CO line and station cabling connections as required.
The FCC requires that wiring of CO lines into a KSU be separated
from wiring of station apparatus into a KSU. Therefore you must use
8. Replace the KSU cover and secure with cover screws.
9. Restore KSU power when all wiring is complete.
2.7.3 KSU ASSEMBLY – ADD-ON MODULES
Whenever you expand the DX-80 system, you install a module into one of the KSU cabinets. Modules
are connected to the various connectors on the 408M/E. Modules are mounted using standoff posts.
Two standoff post sizes are used in the DX-80. The APM4 modules must be installed using the nickel
color 2.5 cm standoffs. All other modules use brass color 1.5 cm standoffs. Proper use of standoff is
imperative to assure proper system operation.
48
WARNING
Sensitive Components, for details.
CAUTION
separate cables for wiring stations and CO lines.
Comdial October, '03