CMU MODULE Replacement
1100.4903.82 3.17 E-4
MODULE Replacement
Caution!
Disconnect the instrument from the mains before opening the casing. Please
note the safety instructions at the beginning of this manual.
When mounting the tube take care not to damage or pull off cables.
Replacing the FRONT MODULE
(see chapter 5, spare part list, Current No. 270/275, and explosion drawing 1100.0008.01 D sheet 2)
For replacement proceed as follows:
Opening the instrument and removing the FRONT MODULE
½ Switch off the instrument, pull the mains plug and unscrew the rear-panel feet.
½ Place the instrument onto the front carrying handles, push the tube upwards and take off.
½ Unscrew the four screws of the front handles at the instrument frame on both sides and take off the
front handles.
½ 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.
½ 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.
½ Unscrew a combi screw at the top of the module support for support of the Option FLOPPY DISK
DRIVE CMU–U61 or PCMCIA INTERFACE.
½ 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.
½ 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 CMU–U61 or PCMCIA
INTERFACE that are still connected to the MOTHERBOARD1.
½ After sliding out the FRONT MODULE disconnect the respective connecting cable for the option from
the MOTHERBOARD1 as follows:
• Option FLOPPY DISK DRIVE CMU–U61: The connecting cable is a film cable.
½ Lift the locking bracket of the connector on the MOTHERBOARD and remove the film cable.
• PCMCIA INTERFACE: The connecting cable consists of three ribbon cables.
½ Disconnect the three ribbon cables from the MOTHERBOARD1 connector.
½ Take the FRONT MODULE completely out of the CMU.
½ Unscrew the two countersunk screws at the cover of the Option FLOPPY DISK DRIVE CMU–U61 or
PCMCIA INTERFACE and carefully pull the option towards the front out of the FRONT MODULE.
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