CMU MODULE Replacement
1100.4903.82 3.23 E-4
Removing the lithium battery
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.
½ Locate the lithium battery on the controller board (see chapter 5, explosion drawing 1090.9244.01 D
sheet 2/3).
½ Unplug jumper J7 (MODEL 04) and J12 (MODEL 12).
½ Carefully unsolder the negative terminal from the soldering lug first using the soldering iron (medium
temperature). Then unsolder the positive terminal. If necessary, remove the mechanical lock (cable
clamp) and take out the battery.
Note: The lithium battery is of the type 3.4 V (
∅
15mm * 25mm ) with soldering lug terminals
(spare part list, Current No. 460).
Caution!
Lithium batteries must not be exposed to high temperatures or fire.
Keep away from children.
If the battery is replaced improperly, there is danger of explosion. Only
replace the battery by R&S type (spare part list, Current No. 460).
Lithium batteries are hazardous waste and must be disposed of in dedicated
containers.
Do not short-circuit the battery!
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