R&S CMU MODULE Replacement
1100.4903.82 3.35 E-5
Making the memory modules accessible
Unscrew the two countersunk screws on the cover of the Option FLOPPY DISK DRIVE R&S CMU–
U61 or PCMCIA INTERFACE and carefully pull out the option from the FRONT MODULE towards
the front.
Place the FRONT MODULE onto a clean surface with the aluminum panel pointing downwards.
Unscrew the four screws on the mounting plate at the top, bottom and right and carefully swing away
the mounting plate towards the rear.
Pull off the connecting cables to the LCD, DC/AC illumination converter, keyboard membrane and
spinwheel.
Note: When pulling off the connecting cables be careful with the cable connecting to the
keyboard. It is a film cable which can only be disconnected after sliding up the lock of the
film cable plug. Besides, be careful with the ribbon cable connecting to the spinwheel. First
loosen the locking brackets of the plug.
Removing the memory module
Remove the old module: Carefully bend the lateral brackets towards the outside and pull out the
memory module.
Installing the new memory module and completing the instrument
Insert the new module: insert the memory module into the slot, slightly press towards the rear and
engage the brackets on the sides.
MODEL 12: The memory modules can be obtained with the size 256 MB (spare part list,
Current No. 220) It is possible to insert one of these modules. It is not recommended to fit
more than 256 MB in sum.First fit slot 1 (U24).
MODEL 22/23/24: The memory modules can be obtained with the size 256 MB (spare part
list, Current No. 23X) It is possible to insert two of these modules, even of different size.
First fit slot 1 (U2) and then slot 2 (U3).
Carefully plug the cable connectors to the controller board without reversing the polarities and
replace the mounting plate in the reverse order.
Install the old Option FLOPPY DISK DRIVE R&S CMU–U61 or PCMCIA INTERFACE in the FRONT
MODULE in the reverse order.
Note: Make sure to route the cables of the Option FLOPPY DISK DRIVE R&S CMU–U61 or
PCMCIA INTERFACE properly, not to catch them and insert them on the MOTHERBOARD
before sliding the FRONT MODULE completely into the R&S CMU.
Complete the instrument without causing damage to the cables.
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