Toshiba MMD-AP0071SH-C Service Manual page 98

Check code name Check code name
[L18] / [8A] Flow selector unit system error
(d07 / AI-NET)
NO
Did set up All cooling
to All cooling indoor unit?
YES
Check code name Check code name
[L20] / [98] Duplicated central
control addresses
(d07 / AI-NET)
Are not two or more YES
central control system identical
network addresses connected?
NO
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[L28] / [46] Quantity over of
connected outdoor units
(d07 / AI-NET)
NO
Is No. of connected
outdoor units below 3 units?
YES
NO
Is communication line between
outdoor units correctly connected?
YES
Check outdoor I/F P.C. board.
Cause of operation
An indoor unit which has been operated in
cooling only mode is operated in heating mode
without setup for cooling only mode.
Set up All cooling mode.
Item code (DN)=OF
Cooling only operation mode=0001
Check flow selector unit.
Cause of operation
Central control addresses are duplicated.
Correct the network address
of the central control system.
Check the network adaptor
on the indoor P.C. board.
Cause of operation
1. Quantity over of connected outdoor units
2. Connection error of communication line
between outdoor units
3. Outdoor I/F P.C. board error
Max. 3 units are allowed for flex system.
Correct connection of communication line.
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[L29] / [CF] IPDU quantity error
(d07 / AI-NET)
Sub-code:
01: IPDU1 error 02: IPDU2 error
03: IPDU1, 2 error 04: Fan IPDU error
05: IPDU1, fan IPDU error 06: IPDU2, fan IPDU error
07: All IPDU error or disconnection of communication line between IPDU-I/F P.C. board or outdoor I/F P.C. board error
Is jumper setup of outdoor I/F P.C. board correct?
(Jumpers 7, 8, 9 ON)
YES
Is communication connector between IPDU and
I/F P.C. board connected?
NO
Is there no disconnection of communication
line between IPDU and I/F P.C. board?
NO
Is there voltage fluctuation between
4 and 5 pins of CN600 on I/F P.C. board.
(Measurement by tester: DC0 to 5V, 5 pin GND)
YES
Is there voltage fluctuation between
3 and 5 pins of CN600 on I/F P.C. board.
(Measurement by tester: DC0 to 5V, 5 pin GND)
YES
Both IPDU (No.1, No.2) and fan IPDU
did not return the communication.
On the fan power supply P.C. board,
1) CN503: Between 1 and 5 pins 12V
2) CN503: Between 2 and 5 pins 7V
3) Between +5V and GND at the side of CN505: 5V
YES
Replace IPDU P.C. board with trouble.
Cause of operation
1. Incorrect model setup in service for I/F P.C.
board
2. Communication error between IPDU, fan
IPDU and I/F
3. IPDU, fan IPDU, I/F P.C. board error
NO
Correct connection of connector.
YES
Correct connection of connector.
YES
Replace communication line.
NO
I/F P.C. board error
NO
IPDU P.C. board error
NO
Replace fan power supply P.C. board.
P.C. board to be replaced
Auxiliary code
01 IPDU1
02 IPDU2
03 IPDU1, 2
04 Fan IPDU
05 IPDU1, fan IPDU
06 IPDU2, fan IPDU
07 IPDU1, 2, fan IPDU, I/F