Repairs: Information and Instructions 17
9.5 Replacing membrane keyboard
Tools and equipment required:
• Phillips screwdriver size 1;
• 7mm open-end wrench.
1. Open the device (see ”9.2 Opening the de-
vice“ on page 15).
2. Carefully detach electrical power pack con-
nector X3 from the circuit board.
3. Unscrew power pack holder (4 cross-head
screws 40).
4. Remove power pack.
5. Carefully detach electrical connectors X1 and
X2 of internal wiring harness from circuit
board.
6. Carefully detach electrical connector X4 to
motor from circuit board.
7. Carefully detach pressure measurement tube 47
from pressure sensor on circuit board.
8. Carefully open up cable grip of ribbon cable
connector X5. Then carefully remove ribbon
cable (do not touch the ribbon cable contacts
with your fingers, as this can cause oxidation.)
9. Unscrew 4 retaining screws 46 from the circuit
board. Remove the circuit board.
10. Detach the front keyboard 4 from inside
through the front of the case, by pressing the
membrane keyboard out upwards and careful-
ly pulling it off.
11. Clean the old adhesive area until no adhesive
residues are left.
12. Take the new membrane keyboard and re-
move the protective layer from the adhesive
surface. Run the ribbon cable through the
opening in the case front.
Take care when inserting the ribbon cable
through the opening in the housing; it must be
properly routed without any kinks.
13. Stick the new membrane keyboard in the cor-
rect position on the case.
40X3
X2 X147
X5
X4
46
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