Toshiba RAV-SM2244DTP-TR Service Manual page 60

[C06] (1:1 model connection interface)
Are U3 and U4 communication lines normal?
YES
Is connection of connector normal?
YES
Are A and B communication lines normal?
YES
Is there no connection trouble of power supply cable?
NO
Is not the source power supply turned on?
YES
Did a power failure occur?
NO
Is the network address changed
from the wired remote controller?
NO
Is there no noise source?
NO
Can the other indoor units
be normally controlled from the central controller?
Or is the operation status of indoor unit reflected?
YES
Can the indoor unit be normally controlled
from the wired remote controller?
YES
Check the power supply transformer of
1:1 model connection interface (MCC-1440).
Defective → Replace
∗1
∗1
In case of 1:1 model connection interface
1:1 model connection interface (MCC-1440) CN51 and indoor P.C. board CN050.
NO
NO
Correct connection of connector.
NO
Check connection of A and B terminal blocks.
Correct communication line of remote controller.
YES
NO
Turn on the source power supply.
YES
YES
YES
Uncontrolled
(Same to others)
Uncontrolled
Check indoor P.C. board (MCC-1643).
– 60 –
Correct communication line.
Correct power wiring.
Clear the check code.
Eliminate noise, etc.
Check central controller.
Defect → Replace
Defect → Replace