MODULE Replacement CMU
1100.4903.82 3.40 E-4
Replacing the TR-CORRECTION MODULE in the RXTX BOARD1
(see chapter 5, spare part list, Current No. 555 and explosion drawing 1100.0008.01 D)
The TR-CORRECTION MODULE is incorporated in the RXTX1 BOARD as sandwich module. For
replacement proceed as follows:
Opening the instrument and removing the TR-CORRECTION MODULE
½ Switch off the instrument, pull the mains plug and unscrew the rear-panel feet.
½ Place the instrument onto the front carrying handles, push the tube upwards and take off.
½ After unscrewing the two countersunk screws at the top left instrument frame, slightly lift the cover at
the instrument top, slightly push to the right and lift off.
½ Place the instrument to the left side and unscrew the two RF SMA coax cables at the bottom of the
RXTX BOARD1 using a special wrench. Likewise, pull off the MMCX plug-in cable at the bottom.
½ Pull off all the MMCX plug-in cables (using a pull-out tool
∗
) from the top of the RXTX BOARD1 and
pull off the module towards the top using the two levers on the right and left.
½ Unscrew one screw of each cooling plate, pull off the cooling plates towards the side and then
unscrew all screws of the RXTX aluminum cover shells. Then the cover shells of the top and bottom
can be removed.
½ Pull off the sandwich module TR-CORRECTION MODULE (using a pull-out tool
∗
) from the RXTX
BOARD1.
Installing the new TR-CORRECTION BOARD and completing the instrument
½ Insert the new TR-CORRECTION MODULE.
½ Reinsert the cover shells in the reverse order and fasten with screws. Attach the cooling plates again.
½ Insert the RXTX BOARD1 into the instrument in the reverse order and carefully connect all the
MMCX plug-in cables and RF-SMA coax cables.
½ Complete the instrument without causing damage to the cables.
½ Connect the instrument to the mains and switch on.
Automatic module data adjustment
½ During startup observe the display.
½ When three BEEPs can be heard, press the MENU SELECT key.
The version manager is started (see also chapter 4, Firmware update). The display includes the
menu item FIRMWARE UPDATE AFTER BOARD CHANGE.
½ Press the softkey to the left of the above mentioned menu item.
The automatic module data adjustment is performed under software control, firmware updates for
microprocessors and programmable devices being performed as well. This may take a few minutes.
After the adjustment has been terminated, the operating software starts automatically and the CMU is
ready for use and complies with the specifications, except for the high-precision level accuracy.
In order to achieve the level accuracy as described in the data sheet, a so-called path error data record
is necessary.
To this end, the CMU must be measured using the test system ACS 100 (see chapter 1, Performance
Test).
∗
available in CMU-Service Kit CMU-Z3 (1100.7690.02)
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