R&S CMU MODULE Replacement
1100.4903.82 3.31 E-5
Removing the lithium battery and installing the new battery
Unscrew the two countersunk screws on the cover of the Option FLOPPY DISK DRIVE R&S CMU–
U61 or PCMCIA INTERFACE and carefully pull out the option from the FRONT MODULE towards
the front.
Place the FRONT MODULE onto a clean surface with the aluminum panel pointing downwards.
Unscrew the four screws on the mounting plate at the top, bottom and right and carefully swing away
the mounting plate towards the rear.
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.
Locate the lithium battery on the controller board (see chapter 5, explosion drawing 1090.9244.01 D
sheet 3).
MODEL 12:
• Unplug jumper J12 (MODEL 12)
• 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.
• Shorten the length of the connecting wires of the new battery as with the old battery and replace with
the correct polarity.
Note: Do not short-circuit the battery!
Note: The lithium battery is of the type 3.6 V (
15 mm * 25 mm ) with soldering lug terminals
(spare part list, Current No. 210).
• If necessary, replace the mechanical lock (cable clamp). First solder the positive terminal to the PC
board, then the negative terminal.
• Plug jumper J12 first to the position middle and left (position RAM discharge) and then to middle
and right position. Leave jumper J12 at this position (position before battery replacement).
MODEL 22, 23, 24:
• Press out the battery from the batteryholder
• Replace battery with the correct polarity
Note: Do not short-circuit the battery!
Note: The lithium battery is of the type 3.0 V(spare part list, Current No. 211).
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).
Lithium batteries are hazardous waste and must be disposed of in dedicated
containers.
Do not short-circuit the battery!
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