Daikin Sky Air FAA71BUV1B Service Manual page 85

To check the wiring between the outdoor unit and the indoor unit
FAA71+100BUV1B
Sky Air indoor units
ESIE22-01 – 2022.02
Examples of waveform distortions on D3Net and possible causes:
After checking and correcting possible causes of F1-F2 transmission problems,
perform a communication reset (see
1 Check that all wires are properly connected and that all connectors are fully
plugged‑in.
2 Check that no connectors or wires are damaged.
3 Check that the wiring corresponds with the wiring diagram, see
4
diagram" [ 93].
5 Third party components
|
Rounded waveforms at falling edges.
Possible reasons:
▪ Excessive wire length,
▪ Excessive number
devices,
▪ Branching (star connections).
Ringing.
Possible reasons:
▪ Transmission wiring very close to high
voltage cables,
▪ Use of multi-conductor type wires.
Noise.
Possible reasons:
▪ Transmission wiring very close to high
voltage cables,
▪ Transmission wiring effected from
external equipment causing noise.
Faulty Waveform.
Possible reasons:
▪ Transmission circuit failure on a PCB.
"5.1.2 Repair procedures" [
of connected
4
86]).
"7.2 Wiring
Service manual
85