Toshiba RAV-SM304MUT-E Service Manual page 57

[P12 error]
Turn off the power.
Are not there connections errors or
disconnection on connectors CN333 and CN334
of indoor unit P.C. board (MCC-1402)?
Remove connectors CN333 and
CN334 of indoor unit P.C. board
(MCC-1402).
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-1402) correct? *1
Is resistance value of fan motor connector
CN333 at motor side of indoor P.C. board
(MCC-1402) correct? *2
Is signal output of indoor fan motor
position detection correct? *3
Check indoor P.C. board
(MCC-1402).
Defect → Replace
AMP Air Conditioning
NO
YES
YES
*
• Are not coil windings between
*
YES
Check resistance of fan motor position detection circuit.
Is not coil winding between
opened or shorted? → Resistance: Approx. 5 to 20kΩ
YES
*
Check fan motor position detection signal.
• Using a tester, measure the voltage between CN334
• Between
YES
NO
NO
1
between (White lead) and
3
(Black lead) and (Red lead) opened or shorted?
5 1
→ For resistance, see the following values.
Approx. 70 to 100Ω
35 to 50Ω
NO
2
1
NO
3
indoor P.C. board (MCC-1402) 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.
and : 5V
4 5
– 57 –
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Correct connection of connector.
Replace indoor fan motor.
Replace indoor fan motor.
1 (Red lead) and 3 (White lead),
(Black lead), between
5
SM56, SM80
SM110, SM140
Replace indoor fan motor.
(Yellow lead) and (Pink lead)
4
Replace indoor fan motor.
1
CN333
CN334
and 5 of