Toshiba MMU-AP0091H service manual 162

Check code Check code name Cause of operation

[–] / [97] AI-NET communication line error AI-NET communication line error

(TCC-L / AI-NET)

162

Are AI-NET X and Y

communication lines normal?

YES

Are connections of CN01,

CN02, and CN03 connectors on network adaptor P.C. board (MCC-1401) and CN309 and CN41 connectors on indoor P.C. board normal?

YES

Are remote controller communication lines (A, B) normal?

YES

Is there no connection error

on the power line?

NO

Is not main power supply

turned on?

NO

Did a block-out occur?

NO

Is the network

address changed by the main

remote controller?

NO

Is there any noise etc.?

NO

Can other indoor units

be controlled from AI-NET central remote controller, or is the operation status of indoor unit the same?

YES

Does the network adaptor

P.C. board LED (D01) turn on?

YES

NO

NO

NO

YES

YES

YES

YES

YES

Unavailable (Others are same.)

NO	Can the		NO
	indoor unit be
	controlled from the main
	remote controller?
		YES

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 ÆReplace

Check indoor P.C. board.

Failure ÆReplace

Check power transformer of the

network adaptor P.C. board (MCC-1401).

Failure ÆReplace