CMU MODULE Replacement
1100.4903.82 3.31 E-4
Making the LCD accessible
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 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 LCD and/or DC/AC Converter
½ Unscrew the two screws of the DC/AC converter shielding and pull off the plug of the connecting
cable to the DC/AC converter.
½ If required, unscrew the two screws of the DC/AC converter and loosen the connecting cable to the
FRONT MODULE CONTROLLER.
½ Remove the DC/AC converter.
½ Loosen the four screws of the LCD shielding and take off the shielding.
Warning!
If there are spacing pieces under the LCD shielding, use them again for
installation.
½ Loosen the connecting cable to the FRONT MODULE CONTROLLER by unscrewing the two screws
and remove.
½ Unscrew the four screws of the LCD on the mounting plate and remove the LCD.
Installing the new LCD and/or DC/AC converter and completing the instrument
½ Insert new LCD and/or DC/AC converter in the reverse order, connect all connecting cables in the
correct position and replace all 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 Replace the old Option FLOPPY DISK DRIVE 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 CMU–U61 or PCMCIA
INTERFACE properly, not to catch them and insert them on the MOTHERBOARD 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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