5-46 888-2629-200 10/6/10WARNING: Disconnect primary power prior to servicing.Section 5 Maintenance and Alignments Maxiva ULX COFDM SeriesSTEP 3 Use the cut outs built into the front of the TCU as handles, pulloutward and down on the front cover of the TCU.STEP 4 On Maxiva ULX transmitters the entire TCU unit can be pivoteddownward for easier access to the cards. This is done by removingthe front screw (shown in figure 5-28) on either side of the TCU slidebrackets.! CAUTION:THE TCU MUST BE SUPPORTED WHILE REMOVING THESE SCREWS TO KEEP ITFROM FALLING DOWNWARD RAPIDLY.NOTE:In other types of transmitters like LAX and HPX the TCU can’t be pivoted down-ward. In these cases a stool or ladder may be used to gain easier access to the topof the TCU unit.STEP 5 Remove the top cover from the TCU to gain easier access to theTCU cards.STEP 6 Remove connectors from the rear of the card that is being changed.STEP 7 Lift the board out of the slot and replace with new board.NOTE:If the MCM card is changed the flash drive card should be removed from the oldboard and installed in the new board. This will allow the system to retain previ-ously stored calibration values.STEP 8 Reverse the steps to reconnect and reinstall the TCU.STEP 9 Verify that the software on the new MCM or PCM cardboard is thesame as was on the board that was removed.STEP 10 End of procedure5.11.5.1 MCM Card ReplacementFollow the instructions given in 5.11.5 on page 5-45 for TCU card removal.The MCM card in the TCU contains several jumpers, a cabinet selector switch (S1rotary), and a toggle switch used to select VT-100 or DNLD inputs. Should the MCM
