User manual

Chapter 3. Installation
3-6 FMUX-01Mar 2003
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
MULTIPLEXER UNIT. 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 "ears" 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.