MODULE Replacement R&S CMU
1100.4903.82 3.58 E-5
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 R&S 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
i
s necessary.
To this end, the R&S CMU must be measured using the test system ACS 100 (see chapter 1,
Performance Test).
Replacing the MODULES: WCDMATX MODULE, TX-FEC MODULE,
WDDC MODULE, RX-FEC MODULE , in the WCDMA L1COPRO CMU-
B66/68/76/78
(see chapter 5, spare part list, Current No. 282X (WCDMATX MODULE), 2830+2831 (TX-FEC
MODULE), 2840 (WDDC MODULE), 2832+2833 (RX-FEC MODULE) and explosion drawing
1100.5041.01 D sheet 3/4)
The sandwich modules WCDMATX MODULE, TX-FEC MODULE, WDDC MODULE, RX-FEC
MODULE) are installed in the WCDMA L1COPRO as plug-in modules. For replacement proceed as
follows:
Opening the instrument and removing the modules
Switch off the instrument, pull the mains plug and unscrew the rear-panel feet.
Place the instrument onto the front carrying handles, push the tube upwards and take off.
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.
Pull off the powersupply cable from the downside of the WCDMA L1COPRO
Pull off all the MMCX plug-in cables (using a pull-out tool) from the top of the WCDMA L1COPRO
and pull off the module towards the top using the two levers on the right and left.
Caution: module could be fitted together with the next module and have to take out together with this (if
available: UNIV.SIGN.UNIT).
Take off the covers by loosening the cover screws.
Carefully loosening the screws of the respective sandwich module (using a torque screwdriver tool)
and take out the module (see chapter 5, drawing 1100.5041.01 D sheet 3/4).
available in CMU-Service Kit CMU-Z3 (1100.7690.02)
available in CMU-Service Kit CMU-Z3 (1100.7690.02)
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