CMU MODULE Replacement
1100.4903.82 3.33 E-4
Removing the membrane
½ Unscrew the two countersunk screws on the cover of the Option FLOPPY DISK DRIVE CMU–U61 or
PCMCIA INTERFACE and carefully pull out the option from the FRONT MODULE towards the front.
½ Place the FRONT MODULE onto a clean surface with the aluminum panel pointing downwards.
½ Unscrew the four screws on the mounting plate at the top, bottom and right and carefully swing away
the mounting plate towards the rear.
½ Pull off the connecting cables to the LCD, DC/AC converter, 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.
½ Place the mounting plate onto the surface with the keyboard frame pointing upwards and unscrew
the 10 countersunk screws of the keyboard frame.
½ Pull off the knob of the spinwheel.
½ Lift off the keyboard frame as well as the mat which is now accessible.
½ Lift off the membrane and pull the connecting cable through the hole of the mounting plate.
Installing the new membrane and completing the instrument
½ Insert the new membrane and/or mat in the reverse order, insert the mat at the correct position
(observe the labeling of the keys!) and fasten the keyboard frame with screws.
½ Carefully plug the cable connectors to the controller board without reversing the polarities and
replace the mounting plate in the reverse order.
½ Install the old Option FLOPPY DISK DRIVE CMU–U61 or PCMCIA INTERFACE in the FRONT
MODULE in the reverse order.
½ Install the FRONT MODULE in the CMU in the reverse order.
Note: Make sure to route the cables of the Option FLOPPY DISK DRIVE CMU–U61 or PCMCIA
INTERFACE properly, not to catch them and insert them on the MOTHERBOARD1 before
sliding the FRONT MODULE completely into the CMU.
½ Complete the instrument without causing damage to the cables.
Putting into operation
½ Connect the instrument to the mains and switch on.
The built-in FRONT MODULE CONTROLLER registers on the LCD and starts the operating software.
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