Carrier 40MBDAQ - Page 20

40MBDAQ: Service Manual
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
20
DIAGNOSIS AND SOLUTION (CONT.)
For XYE Communication
No
Power o, then restart the unit
2 minutes later.
Adopt shield cable grounding.
No
Yes
Correct the connection.
No
Yes
Remove the interference or
add a magnet ring on the
power wire.
Yes
Yes
Replace the signal wire.
Yes
Pull out and insert back.
No
No
Replace the indoor main PCB.
Is the error distinguished.
Yes
Replace the outdoor main PCB.
No
Check whether there is any
interferance (e.g. too many
lamps or power transformers).
Or is the signal wire too long?
Check whether the signal wire is
shield cable or whether the
shield cable is a ground wire.
Check whether the wire is
correct polarity (P to P, Q to Q, E to E).
Check whether the signal wire is broken.
Check whether the signal wires
are inserted on the PCB rmly.