CMU MODULE Replacement
1100.4903.82 3.39 E-4
Replacing the RXTX BOARD1
(see chapter 5, spare part list, Current No. 550 and explosion drawing 1100.0008.01 D sheet 2)
The RXTX BOARD1 is installed in the module support as plug-in module. For replacement proceed as
follows:
Opening the instrument and removing the RXTX BOARD1
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 top of the instrument, slightly shift towards 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 (using a pull-out
tool
∗
) from the bottom.
½ Pull off all MMCX plug-in cables from the top of the RXTX1 BOARD and pull out the board using the
two levers on both sides.
Installing the new RXTX BOARD1 and completing the instrument
½ Insert the new RXTX BOARD1 into the instrument in the reverse order and carefully connect all the
MMCX plug-in 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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