CMU Contents
1100.4903.82 5 E-5
3 Repair ..............................................................................................................................................3.1
Instrument Design and Function Description ...............................................................................3.1
Block diagram ..........................................................................................................................3.2
Instrument Frame.....................................................................................................................3.3
R
ear of Instrument Frame........................................................................................................3.3
Front of Instrument Frame .......................................................................................................3.3
Cooling the Instrument .............................................................................................................3.4
FRONT MODULE ....................................................................................................................3.5
POWER SUPPLY ....................................................................................................................3.6
MOTHERBOARD .....................................................................................................................3.7
REFERENCE BOARD .............................................................................................................3.9
Option OCXO REFERENCE OSC. R&S CMU-B11 or B12 ...................................................3.10
RF FRONTEND .....................................................................................................................3.10
RXTX BOARD1......................................................................................................................3.11
DIGITAL BOARD....................................................................................................................3.13
Option UNIVERSAL SIGNALLING UNIT R&S CMU-B21 Var02 ...........................................3.14
Option UNIVERSAL SIGNALING UNIT R&S CMU-B21 Var 14/54 .......................................3.16
Option AUDIO-GEN. + ANA. R&S CMU-B41.........................................................................3.18
Option WCDMA L1COPRO R&S CMU-B66/68/76/78 ..........................................................3.19
Option CDMA (IS95) Signaling Unit R&S CMU-B81 ..............................................................3.21
Option CDMA2000 Signaling Unit R&S-B83 Var12 ...............................................................3.22
Option CDMA2000 Signaling Unit R&S CMU-B83 Var22 ......................................................3.23
MODULE Replacement...................................................................................................................3.25
Replacing the FRONT MODULE ...........................................................................................3.25
Opening the instrument and removing the FRONT MODULE ........................3.25
Installing the new FRONT MODULE and completing the instrument .............3.26
Putting into operation ......................................................................................3.26
Replacing the FRONT MODULE CONTROLLER in the FRONT MODULE ..........................3.27
Opening the instrument and removing the FRONT MODULE ........................3.27
Removing the FRONT MODULE CONTROLLER ..........................................3.28
Installing the new FRONT MODULE CONTROLLER .....................................3.28
Installing the option again and completing the instruments ............................3.28
Putting into operation ......................................................................................3.29
Replacing the Lithium Battery in the FRONT MODULE.........................................................3.30
Opening the instrument and removing the FRONT MODULE ........................3.30
Removing the lithium battery and installing the new battery ...........................3.31
Completing the instrument ..............................................................................3.32
Putting into operation ......................................................................................3.32
Replacing the Hard Disk in the FRONT MODULE.................................................................3.33
Opening the instrument and removing the FRONT MODULE ........................3.33
Removing the hard disk from the FRONT MODULE ......................................3.33
Installing the new hard disk.............................................................................3.33
Putting into operation ......................................................................................3.33
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