Toshiba MMD-AP0071SH-C Service Manual page 107

Check code name Check code name
[–] / [97] AI-NET communication line error
(d07 / AI-NET)
NO
Are AI-NET X and Y
communication lines normal?
YES
Are connections of CN01,
CN02, and CN03 connectors
NO
on network adaptor P.C. board
(MCC-1401) and CN309
and CN41 connectors on
indoor P.C. board normal?
YES
Are remote controller NO
communication lines
(A, B) normal?
YES
YES
Is there no connection error
of power line?
NO
YES
Is not main power supply
turned on?
NO
YES
Did a block-out occur?
NO
Is the network YES
address changed by main
remote controller?
NO
YES
Is there no noise etc.?
NO
Can be other indoor units
normally controlled from Unavailable (Others are same.)
AI-NET central remote controller,
or is the operation status
of indoor unit reflected?
YES
Can be the
NO
Does the network adaptor indoor unit normally
P.C. board LED (D01) turn on? controlled from the main
remote controller?
YES
YES
Cause of operation
AI-NET communication line error
Correct communication line.
Correct connection of connectors.
Check connection of A, B terminal.
Correct communication line of remote controller.
Correct power line.
Turn on the main power supply.
Clear check code.
Eliminate noise, etc.
Check central controller.
Failure Replace
NO
Check indoor P.C. board.
Failure Replace
Check power transformer of the
network adaptor P.C. board (MCC-1401).
Failure Replace