Sanyo 24KHS72 Service Manual - Page 52

10. CHECKING ELECTRICAL COMPONENTS 10-1. Measurement of Insulation Ground wire Resistance Clip The insulation is in good condition if the resistance exceeds 1M ohm. 10-1-1. Power Supply Cord Clamp the grounding wire of power cord with the lead clip of the insulation resistance tester and measure the resistance by placing a probe on either of the two power wires. (Fig. 1) Then also measure the resistance between the grounding and other power terminals. (Fig. 1) Probe Insulation tester Fig. 1 Terminal plate Probe 10-1-2. Indoor Unit Clamp an aluminum plate fin or copper tube with the lead clip of the insulation resistance tester and measure the resistance by placing a probe on each terminal screw on the terminal plate. (Fig. 2) Note that the ground line terminal should be skipped for the check. 10-1-3. Outdoor Unit Clamp a metallic part of the unit with the lead clip of the insulation resistance tester and measure the resistance by placing a probe on each terminal screw where power supply lines are connected on the terminal plate. (Fig. 2) Clip Copper tube or metallic part Fig. 2 Insulation tester Probe 10-1-4. Measurement of Insulation Resistance for Electrical Parts Disconnect the lead wires of the desired electric part from terminal plate, capacitor, etc. Similarly disconnect the connector. Then measure the insulation resistance. (Figs. 3 and 4) NOTE Refer to Electric Wiring Diagram. If the probe cannot enter the poles because the hole is too narrow then use a probe with a thinner pin. Clip Copper tube or metallic part Insulation tester Fig. 3 From fan motor, compressor and other parts Metallic part Clip Probe Insulation Fig. 4 tester 52