Electrical Circuit Inspection Procedure: Notes

• Continuity Check
• Voltage Check

  If an open circuit occurs (as seen in [FIG. 1]), it can be found by performing Step 2 (Continuity Check Method) or Step  3 (Voltage Check Method) as shown below.

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Specification (Resistance) 

1Ω or less → Normal Circuit

1MΩ or Higher → Open Circuit

1. Disconnect connectors (A) and (C), and measure resistance between connectors (A) and (C) as shown in [FIG. 2].

   In [FIG. 2], if the measured resistances in lines 1 and 2 are "over 1 MΩ" and "below 1Ω" respectively, line 1 has an open circuit.

   (Line 2 is normal.) To find the exact broken point, check the sub line of line 1 as described in the next step.

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2. Disconnect connector (B), and measure the resistances between connectors (C) and (B1), and between (B2) and (A) as shown in [FIG. 3].

   In this case, the measured resistance between connectors (C) and (B1) is higher than 1 MΩ and the open circuit is between terminal 1 of connector (C) and terminal 1 of connector (B1).

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1. With each connector still connected, measure the voltage between the chassis ground and terminal 1 of each of connectors (A), (B) and (C) as shown in [FIG. 4].

   The measured voltages of connectors are 5V, 5V and 0V respectively. So the open circuit is between connectors (C) and (B).