User manual

Chapter 3. Installation
24 Version 1.2 Apr 2006
3.5.3 Top cover Removal / Replacement for internal access
Normally, there is no need to remove the cover of the unit. All interface cards can be removed
and replaced without the need to access the internal portion of the Fiber Multiplexer. However, to
change any AC or DC power module, add the SNMP and/or External clock feature, or to change the
internal firmware, internal access is required and the cover must be removed.
***CAUTION***
This procedure should only be performed by qualified service personnel. In addition, all
power connections must be removed before attempting to open the case.
1. If the unit is installed in a rack, it must be removed.
2. The rack mounting brackets, if installed, must both be removed.
3. Follow the procedure in 3-5-2 and remove the Port No. 2 4-Channel Port module.
4. The top cover is held in place by seven screws. Remove the two upper screws on each side
of the unit.
5. From the back of the unit, remove the upper screws on the far left, far right, and center of
the unit. (The center screw is hidden unless the No.2 Port module is removed.)
6. Use your finger to push up the top panel through the open Port No.2 hole.
7. Once the back of the top panel is up and cleared, pull it towards the rear of the unit so that
the panel slides out from under the lip of the front cover. The internals are now exposed.
Follow the procedure in reverse to re-install the top panel. Install the screws in the reverse
order as well, starting with the rear panel center screw, then the left and right rear panel screws and
lastly the side panel screws. Re-install the rack mount ears if they were removed.