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5. STEP MOTOR
5
1
Test in resistance.
TOOL: Multimeter.
Test the resistance of winding. The stepper motor is fault if the resistance of winding 0(short
circuit)or∞（open circuit）.
6. FUSE
Checking continuity of fuse on PCB ASS'Y.
1) Remove the PCB ASS'Y from the electrical component box. Then pull out the fuse from the
PCB ASS'Y (Fig.1)
2) Check for continuity by a multimeter as shown in Fig.2.
7.CAPACITOR
1) Remove the lead wires from the capacitor terminals, and then place a probe on the
capacitor terminals as shown in Fig.3.
2) Observe the deflection of the pointer, setting the resistance measuring range of the
multimeter to the maximum value.
* The capacitor is "good" if the pointer bounces to a great extent and then gradually returns to
its original position.
* The range of deflection and deflection time differ according to the capacity of the capacitor.
UNITARY AIR CONDITIONER TECHNICAL& SERVICE MANUAL V6.0
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Fuse
PCB Ass'Y
F u s e
F i g . 2
Fig.1
131
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