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5 CF65/75/85 Series ≥0E621376 Fault finding DIAGNOSTICS 1-3 1.2 OPEN CIRCUIT Suppose a consumer is not functioning. The fault may be in the consumer itself, or there may be an open circuit in the wiring. First switch on the consumer. Then check the consumer for voltage using a test lamp. If no voltage is found, first check whether the fuse is still intact. If there is voltage at the fuse, check the wiring from the fuse to the consumer. This means every wiring connection must be checked. Stop at the first wiring connection that has no voltage. The open circuit will be between this connection and the previous one. However, if there was a voltage at the consumer, there may still be an open circuit in the negative (earth) wiring. Check this using a test lamp. Ensure that the relevant circuit is switched on. Connect one end of the test lamp to earth and the other end to the earth connection of the component to be checked. If the test lamp lights up, the earth connection of the component is interrupted. If the test lamp does not light up, the earth connection will in many cases be in good condition. If both the positive and negative connections are in good order, the consumer in question must be replaced. W 5 03 015 W 5 03 016 1 200520 |