SUPER DIGITAL
SUPER DIGITAL
SUPER DIGITAL
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[P12 error]<br />
Revised 2: Jun., 2008<br />
Turn off the power.<br />
Is there no connection error or<br />
disconnection on connectors CN333<br />
and CN334 of indoor unit P.C. board<br />
(MCC-1570)?<br />
NO<br />
YES<br />
Correct connection<br />
of connector.<br />
CN333<br />
Remove connectors CN333<br />
and CN334 of indoor unit P.C. board<br />
(MCC-1570).<br />
CN334<br />
Does the fan rotate without trouble<br />
when handling the fan with hands?<br />
YES<br />
NO<br />
Replace indoor fan motor.<br />
Are resistance values<br />
between phases at fan motor connector<br />
CN333 motor side of indoor P.C. board<br />
(MCC-1570) correct? ∗1<br />
Incorrect<br />
Replace indoor fan motor.<br />
Correct<br />
∗1<br />
• Are not coil windings between (Red lead) and (White lead),<br />
between (White lead) and (Black lead),<br />
between (Black lead) and (Red lead) opened or shorted?<br />
→ The resistance should be the resistance value below.<br />
SM56, SM80 → Approx. 70 to 100Ω<br />
SM110, SM140, SM160 → Approx. 27 to 40Ω<br />
• Is not grounded between cabinet and , , . → It should be 10MΩ or more.<br />
Is resistance value of<br />
fan motor connector CN334 motor side<br />
of indoor P.C. board<br />
(MCC-1570) correct? ∗2<br />
Incorrect<br />
Replace indoor fan motor.<br />
Correct<br />
∗2<br />
Resistance value confirmation of the fan motor position detection circuit<br />
Is not status between (Yellow lead) and (Pink lead) opened or shorted?<br />
→ The resistance should be approx. 5k to 20kΩ.<br />
Is output of<br />
indoor fan motor position<br />
detection signal correct? ∗3<br />
NO<br />
Replace indoor fan motor.<br />
YES<br />
∗3<br />
Confirmation of the fan motor position detection signal<br />
• Using a voltage tester, measure voltage between CN334 and on the indoor P.C. board<br />
(MCC-1570) under condition that CN333 and CN334 are mounted and the power supply is turned on.<br />
→ When rotating the fan slowly with hands, the pin voltage should shake between 0 and 5V.<br />
• Between and : 5V<br />
Check indoor P.C. board<br />
(MCC-1570).<br />
Defect → Replace<br />
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