MODULE Replacement R&S CMU
1100.4903.82 3.60 E-5
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 all cables (if fitted) from the top of the OPTION CDMA2000 SIGNALING UNIT.
Take out the module using the two levers on the right and left.
Installing the new OPTION CDMA2000 SIGNALING UNIT and completing the instrument
Insert the new OPTION CDMA2000 SIGNALING. UNIT into the instrument in the reverse order and
connect all the cables on the top.
Complete the instrument without causing damage to the cables.
Connect the instrument to the mains and switch on.
Automatic module data adjustment
During startup observe the display.
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.
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.
Replacing the MODULES: ACCESS MODULE CMU-B82, SPEECH
CODEC MODULE CMU-B85, HDR MODULE CMU-B88 in the
CDMA2000 Signaling Unit CMU-B83 Var12
(see chapter 5, spare part list, Current No. 3310 (ACCESS MODULE), 332X (SPEECH CODEC
MODULE) 3325 (HDR MODULE) and explosion drawing 1150.0301.01 D sheet 2)
The sandwich modules ACCESS MODULE, SPEECH CODEC MODULE, HDR MODULE are installed
in the CDMA2000 SIGNALING UNIT 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 all cables (if fitted) from the top of the OPTION CDMA2000 SIGNALING UNIT.
Pull off the module towards the top using the two levers on the right and left.
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 1150.0301.01 D sheet 2).
Installing the new sandwich module and completing the instrument
available in CMU-Service Kit CMU-Z3 (1100.7690.02)
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