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7.9.11 Replace PC
board B
TRM, Centiva/5 Plus, M1047448/CM-922026, rev. 3.50.a
The PC board B is located on the sub chassis. To replace the PC board B:
1. Remove the control panel according to section 7.2.2.
2. Remove the panel mounting plate according to section 7.2.6.
3. Open the main engine according to section 7.2.5.
4. Remove back-up battery according to section 7.9.2.
5. Disconnect electrical connectors X 21, X 22, X23, X 10, X15, X16, X 24, X 31,
X 42 and X 44.
6. Disconnect exp. flow measuring tube A at the expiratory valve control
assembly. NOTE: Check caution note in section 7.1. !
7. Disconnect pressure measuring tube B at the tube connector.
NOTE: Check caution note in section 7.1. !
8. Disconnect flow measurement tubes C/C' and D/D' at the tube connectors.
NOTE: Check caution note in section 7.1. !
9. Disconnect "ambient" tube for the pressure transducers at the T-piece towards
the pneumatic assembly.
Note
Check caution note in section 7.1. !
10. Unscrew the three nuts (top left, top middle and top right), fixing the PC board
B to the sub chassis by using a 5.5 mm wrench.
11. Remove the PC board B by lifting it forward and up.
12. Replace the PC board B and fix the three nuts.
13. Reconnect "ambient" tube, flow measurement tubes C/C' and D/D', pressure
measuring tube B and exp. flow measuring tube A.
NOTE: Check caution note in section 7.1. !
14. Reconnect electrical connectors X 21, X 22, X23, X 10, X15, X16, X 24, X 31, X
42 and X 44.
15. Perform all calibrations according to section 4.7.1 to 4.7.8
16. Insert back-up battery according to section 7.9.2.
17. Close the main engine, add the control panel and expiratory valve.
18. Perform five (5) system tests successfully to rewrite all storage levels in the B
EEPROM.
7 Repair procedures
7-39
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