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7-7 Checking electrical components

The insulation is in good condition if the resistence exceedes 1 MOhm

power supply wires

Clamp the earthed wire of the power supply wires with the lead clip of the insulation resiatance tester and measure the resistance

by placing a probe on either of the power wires (fig.1). Then measure the resistance between the earthed wire and the other

power wires (fig.1). Clamp an alluminium plate fin or copper tube with the lead clip of the insulation resistance tester and measure

the resistance by placing a probe on N terminal, and then on L terminal in the terminal plate (fig.2).

measurement of insulation resistance for electrical parts

Disconnect the lead wires of the desired electrical part from terminal plate, PCB assy, capacitor, etc. Similarly disconnect the

connector, then measure the insulation resistance (fig.1 to 4). Refer to electric wiring diagram.

Checking continuity of fuse on PCB assy

Remove PCB assy from electrical component box (fig.5), then pull out the fuse from PCB assy.

Check continuity of fuse by the multimeter (fig.6).

Remove the lead wires from the capacitor terminals, and then place a probe on the

capacitor terminals as shown in fig.7. 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 the gradually

returns to its original position. The range of deflection and deflection time

deffer according to capacity of the capacitor.