R&S CMU MODULE Replacement
1100.4903.82 3.49 E-5
Replacing the MODULES: ADC MODULE1, DDC MODULE1, TXDSP
MODULE1, AUC MODULE1 in the DIGITAL BOARD
(see chapter 5, spare part list, Current No. 72X (ADC MODULE1), Current No. 71X (DDC MODULE1),
C
urrent No. 75X (TXDSP MODULE1), Current No. 760 (AUC MODULE1) and explosion drawing
1100.1940.01 D sheet 2)
The sandwich modules ADC MODULE1, DDC MODULE1, TXDSP MODULE1 and AUC MODULE1 are
installed in the DIGITAL BOARD 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 instrument top, slightly push to the right and lift off.
Pull off all the MMCX plug-in cables (using a pull-out tool
) from the top of the DIGITAL BOARD and
pull off the module towards the top using the two levers on the right and left.
By Digital Board 1100.1791.0X (spare part list, Current No. 700 or 701) remove the cover of the
higher HVC side (B-side) by loosening the cover screws.
By Digital Board 1100.1940.0X (spare part list, Current No. 702 or 703) remove the covers by
loosening the cover screws.
Carefully lever out the respective sandwich module (using a pull-out tool) in the case of the ADC
MODULE loosen the two or threefixing screws before.
Installing the new sandwich module and completing the instrument
Replace by a new module.
Caution!
Take care to insert the module at the correct position.
The heat conducting mats have to be stuck to the components of the modules
(see chapter 5, drawing 1100.1940.01 D sheet 2).
Insert the DIGITAL BOARD into the instrument in the reverse order and connect all the MMCX plug-
in cables.
Complete the instrument without causing damage to the cables.
Connect the instrument to the mains and switch on.
available in CMU-Service Kit CMU-Z3 (1100.7690.02)
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