Electrical Circuit Inspection Procedure

• 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.

Fig 1: Checking Open Circuit

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Specification (Resistance) 

10 or less Ω Normal Circuit

1MΩ or Higher Ω Open Circuit

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

   In [Fig 2], the measured resistance of line 1 and 2 are higher than 1MΩ and below 1 Ω respectively. Specifically, the open circuit is line 1. (Line 2 is normal.) To find exact break point, check sub line of line 1 as described in next step.

   Fig 2: Measuring Resistance Between Connector (A) And (C)

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2. Disconnect connector (B), and measure the resistance between connector (C) and (B1) and between (B2) and (A) as shown in [Fig 3]. In this case, the measured resistance between connector (C) and (B1) is higher than 1MΩ and the open circuit is between terminal 1 of connector (C) and terminal 1 of connector (B1).
   Fig 3: Measuring For Resistance Between Connector (C) Or (B1) And Between (B2) Or (A)

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

   The measured voltage of each connector is 5V, 5V and 0V respectively. So the open circuit is between connector (C) and (B).

   Fig 4: Measuring Voltage Between Chassis Ground And Terminal 1 Of Each Connectors (A), (B) And (C)

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• Continuity Check with Chassis Ground

If short to ground circuit occurs as shown in [Fig 5], the broken point can be found by performing Step  2 (Continuity Check Method with Chassis Ground) as shown below.

Fig 5: Checking Short Circuit

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Specification (Resistance) 

1Ω or less → Short to Ground Circuit

1MΩ or Higher → Normal Circuit

1. Disconnect connectors (A), (C) and measure the resistance between connector (A) and Chassis Ground as shown in [Fig 6].

   The measured resistance of line 1 and 2 in this example is below 1 Ω and higher than 1MΩ respectively. Specifically, the short to ground circuit is on Line 1. (Line 2 is normal.) To find exact broken point, check the sub line of line 1 as described in the following step.

   Fig 6: Measuring Resistance Between Connector (A) And Chassis Ground

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2. Disconnect connector (B), and measure the resistance between connector (A) and chassis ground, and between (B1) and chassis ground as shown in [Fig 7].

   The measured resistance between connector (B1) and chassis ground is 1Ω or less. The short to ground circuit is between terminal 1 of connector (C) and terminal 1 of connector (B1).

   Fig 7: Measuring Resistance Between Connector (A) And (B1) And Chassis Ground

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