Toshiba MMD-AP0071SH-C Service Manual page 84

Check code Check code name
[E06] / [04] Decreased number of indoor units
(d07 / AI-NET)
Sub-code: No. of indoor units which received signals normally
Is there no miscabling/ YES
disconnection on communication line
betweenindoor and outdoor?
NO
NO
Is connection of CN40 connector
on indoor P.C. board normal?
YES
NO
Is connection of CN01 connector
on outdoor I/F P.C. board normal?
YES
NO
Is power of indoor turned on?
YES
NO
Did a power failure occur?
YES
YES
Is there no noise, etc?
NO
Check indoor P.C. board.
(NOTE)
Defect Replace
1. When signal is not sent for a certain period from the indoor unit
which has used to send signals normally, [E06] is displayed.
Cause of operation
1. Communication lines (U1, U2) connection
error between indoor and outdoor
2. Connector connection error of communica-
tion for indoor P.C. board
3. Connector connection error of communica-
tion for outdoor I/F board
4. Power supply of indoor unit
(Is power turned on?)
Correct communication line.
Correct cabling of cable connector.
Turn on power of indoor unit.
Clear the check code.
Check noise, etc, and eliminate it if any.
Check code Check code name
[E07] / [–] Indoor/Outdoor
communication circuit error
(d07 / AI-NET)
(Detected at outdoor side)
Is setup of end terminal resistance
of outdoor unit normal?
YES
Is inter-unit cable (U1, U2) between
indoor and outdoor short-circuited?
NO
NO
Is connection of inter-unit wire
between indoor and outdoor correct?
YES
Correct
communication line.
YES
Is there no error on
power wire to outdoor unit?
NO
Correct power wire.
YES
Is there noise source?
NO
Eliminate noise.
Outdoor I/F P.C. board failure
Replace
Cause of operation
1. Indoor/outdoor communication end terminal
resistance setup error
2. Indoor/outdoor communication connection
error
NO
Correct setup of end
terminal resistance.
YES
Correct short-circuit.
NO
Is F400 (fuse) on
I/F P.C. board opened?
YES
* Check conduction
with tester.
Turn on power to
start operation.
I/F P.C. board failure
However an emergent operation is
available by inserting connector to
be connected to CN01 to CN33.