Toshiba MMK-AP0073HP1-E1 Service Manual page 96

Check code
[E04] / [04]
(Current code / AI-NET)
Was power turned on in order
of indoor unit → outdoor unit?
YES
Is connection (U1/U2 terminals) of
indoor/outdoor inter-unit cable normal?
YES
Is connector connection from
U1/U2 terminals of indoor/outdoor
inter-unit cable normal?
YES
Is setup of the model SELECT SW
(SW02) on wall type P.C. board of normal?
Bit 1: ON
Bit 2: OFF
YES
Is the end terminal resistance
setup of outdoor unit normal?
YES
Is address setup correct?
YES
Is power applied to fuse (F03)
on indoor P.C. board?
YES
Is there no noise, etc?
NO
Check indoor P.C. board.
Defect → Replace
Check code name
Indoor/Outdoor
communication circuit error
(Detected at indoor side)
NO
NO
NO
NO
NO
NO
NO
YES
1. Power of outdoor unit was firstly turned on.
2. Connection error of communication line
between indoor and outdoor
3. End terminal resistance setup error on
communication between indoor and outdoor
4. Address setup error
5. Switch setup error of wall type P.C. board
Turn on power again in order of
indoor unit → outdoor unit.
Correct connector connection.
Correct the end terminal resistance setup.
Check connection of inter-unit cable between
indoor and outdoor is correct, and then
connect communication line connector on
indoor P.C. board (CN40) to CN44 (EMG).
Check noise, etc, and eliminate it if any.
For details, refer to "Troubleshooting in test operation".
96
FILE NO. SVM-16046
Cause of operation
Correct inter-unit cable.
Correct switch setup.
Set up address again.