Toshiba Super MMU-AP0091H Service Manual page 193

Check code name
[P12] / [11]
(d07 / AI-NET)
Turn off power supply.
Is there connection error or
disconnection on connector CN333, CN334
of indoor P.C. board (MCC-1402)?
NO
Remove connectors CN333 and CN334
on indoor P.C. board (MCC-1402).
Does fan turn without trouble
when turning it with hands?
YES
Is resistance value between each phase
at motor side of fan motor connector CN333 on
indoor P.C. board (MCC-1402) correct? *1
YES
Is resistance value at motor side of
fan motor connector CN334 on indoor P.C. board
(MCC-1402) correct? *2
YES
Is output of indoor fan motor position
detective signal correct? *3
YES
CN333
CN334
Check code name
Indoor fan motor error
* Detectable in model with DC fan motor
YES
NO
NO
*1
• Is not winding 1 (Red lead) to 3 (White lead), 3 (White lead) to 5 (Black lead),
5 (Black lead) to 1 (Red lead) opened/shorted?
[4-way Air Discharge Cassette type]
MMU-AP0091H, AP0301
MMU-AP0361H, AP0561
[Concealed Duct Standard type]
15 to 35
• Is not grounded between cabinet and 1, 3, 5?
NO
*2
Check resistance value of fan motor position detective circuit.
• Is not winding 1 (Yellow lead) to 4 (Pink lead) opened/shorted?
NO
*3
Check fan motor position detective signal.
• Measure voltage with tester between CN334 1 and 5 on indoor P.C. board (MCC-1402)
under condition of CN333 and CN334 installed and power-ON.
Turn fan slowly with hands so that pin voltage
• Between 4 and 5: 5V
1. Cabling error of fan motor connector
2. Fan motor error
3. Indoor P.C. board error
(4-way Air Discharge Cassette, or Concealed Duct Standard type)
Resistance value should satisfy the follows.
Approx. 70 to 100
Approx. 35 to 50
Should be
fluctuates
193
Cause of operation
Correct connector connection.
Replace indoor fan motor.
Replace indoor fan motor.
10 or more
Replace indoor fan motor.
Resistance should be 5 to 20k
Replace indoor fan motor.
between 0 and 5V.
Check indoor P.C. board (MCC-1402).
Failure Replace