GE Centiva/5 Plus, Technical Reference Manual

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7 Repair procedures
TRM, Centiva/5 Plus, M1047448/CM-922026, rev. 3.50.a 7-22
7.7.3 Change the main
engine fuses
Note
Note
The Centiva/5 Plus CC ventilator’s main engine is protected by the following fuses
that are all located on the PC board B:
•
SI 10 = Alarm speaker B = 0.315 A slow blow.
•
SI 11 = Fan = 0.315 A slow blow.
•
SI 21 = Transformer secondary 1 = 3.15 A slow blow.
•
SI 22 = Transformer secondary 2 = 3.15 A slow blow.
•
SI 23 = Line 24 V DC inlet = 3.15 A slow blow.
•
SI 24 = Back-up battery = 3.15 A slow blow.
•
SI 25 = Battery charger = 0.5 A slow blow.
•
SI 26 = + 13 V bus = 3.15 A slow blow.
•
SI 27 = + 15 V bus = 3.15 A slow blow.
•
SI 28 = + 5 V bus = 0.5 A slow blow.
•
SI 29 = isolated power supply (serial) = 0.315 A slow blow.
•
SI 41 = Exp. Valve heater = 1.0 A slow blow.
Always use the identical type and rating when replacing a fuse. For details see list
of fuses in section 9.7.
To replace the fuses on the PC board B inside the main engine follow this
sequence:
1. Open the main engine according to section 7.2.5.
2. Disconnect the back-up battery connector X23.
3. Replace fuse.
4. Verify proper function after reassembly by performing a power-up test.
5. If the fuse blows again, analyze the reason prior to another replacement of
fuses.
For location details of fuses refer to the component print of PC board B in section 9.
It is necessary to remove the battery according to section 7.9.1 to access SI 10, SI
11, SI 25, SI 28 SI 29. Replacement of these fuses requires the use of long nose
pliers.