R&S CMU MODULE Replacement
1100.4903.82 3.39 E-5
Replacing the Keyboard Membrane and/or Mat on the FRONT
MODULE
(see chapter 5, spare part list, Current No. 161 (Keyboard Mat) / 171 (Keyboard Membrane) and
e
xplosion drawing 1090.9244.01 D sheet 3)
The keyboard membrane is the contact film for the rubber keys (mat) behind the labeling panel and the
keyboard frame. For replacement proceed as follows:
Warning!
If the old Keyboard Membrane (spare part list, Current No. 160) or the old
Keyboard Membrane (spare part list, Current No. 170) have to be changed.
Both things have to be replaced.
Additional have to be replaced the Keyboard frame spare part list, Current
No. 181, Mountig tube spare part list, Current No. 50xx and the Labeling
Panel (spare part list, Current No. 50xx).
Opening the instrument and removing the FRONT MODULE
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.
Unscrew the four screws of the front handles at the instrument frame on both sides and take off the
front handles.
Unscrew a countersunk screw (if present) at the front on the labeling panel next to the spinwheel and
pull off the labeling panel towards the front.
Unscrew two countersunk screws in the front frame at the top and at the bottom as well as two
countersunk screws at the front above the AUX1/2 BNC connectors.
Unscrew a combi screw at the top of the module support for support of the Option FLOPPY DISK
DRIVE R&S CMU–U61 or PCMCIA INTERFACE.
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.
Slightly push the FRONT MODULE from the rear to the front using little pressure.
Note: Note the connecting cables for the Option FLOPPY DISK DRIVE R&S CMU–U61 or
PCMCIA INTERFACE that are still connected to the MOTHERBOARD1.
After sliding out the FRONT MODULE disconnect the respective connecting cable for the option from
the MOTHERBOARD1 as follows:
• Option FLOPPY DISK DRIVE R&S CMU-U61: The connecting cable is a film cable.
Lift the locking bracket of the connector on the MOTHERBOARD1 and remove the film
cable.
• PCMCIA INTERFACE: The connecting cable consists of three ribbon cables.
Disconnect the three ribbon cables from the MOTHERBOARD1 connector.
Take the FRONT MODULE completely out of the R&S CMU.
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