Toshiba RAV-SM406BT-E Service Manual page 51

[P12 error]
Turn off the power.
Is the static pressure setting correct?
Is the capacity setting correct?
Are not there connections errors or
disconnection on connectors CN333 and CN334
of indoor unit P.C. board (MCC-1631)?
Remove connectors CN333 and
CN334 of indoor unit P.C. board
(MCC-1631).
Does the fan rotate without trouble
when handling the fan with hands?
Are resistance values between phases
at fan motor connector CN333 motor side of
indoor P.C. board (MCC-1631) correct? *1
Is resistance value of fan motor connector
CN333 at motor side of indoor P.C. board
(MCC-1631) correct? *2
Is signal output of indoor fan motor
position detection correct? *3
Check indoor P.C. board
(MCC-1631).
Defect → Replace
YES
YES
NO
YES
YES
YES
YES
NO
NO
YES
NO
NO
1
*
• Are not coil windings between
between (White lead) and
3
(Black lead) and
5 1
→ For resistance, see the winding Resistance of Fan Motor.
(Page 57)
NO
2
*
Check resistance of fan motor position detection circuit.
Is not coil winding between
opened or shorted? → Resistance: Approx. 5 to 20kΩ
NO
3
*
Check fan motor position detection signal.
• Using a tester, measure the voltage between CN334
indoor P.C. board (MCC-1631) under condition that CN333 and
CN334 are mounted and the power is turned on.
→ Rotate the fan slowly with hands, and check the pin voltage
swings between 0 to 5V voltage.
• Between and : 5V
4 5
– 51 –
Correct setting of the static pressure.
Change cappacity setting.
Correct connection of connector.
Replace indoor fan motor.
Replace indoor fan motor.
1 (Red lead) and
(Black lead), between
5
(Red lead) opened or shorted?
Replace indoor fan motor.
(Yellow lead) and
1 4
Replace indoor fan motor.
CN333
3 (White lead),
(Pink lead)
1 5
and of
CN334