Cause: Dust, oil or oxide layer on the pin and socket end blocks effective contact.
Solution: Wipe the pin and socket with anhydrous ethanol, re-mate after air drying (no cotton swab lint left).
Cause: Poor wiring leads to unstable connection between wire core and pin/socket.
Solution: Re-solder or crimp the wire core, and use heat shrink tube/potting glue to reinforce the wire core fixation.
Cause: The lock nut is not fully tightened, resulting in insufficient contact between pin and socket.
Solution: Fully tighten the lock nut (hear "click" sound if available) to ensure tight fit of pin and socket.
Cause: Pin end is deformed or bent due to improper insertion/mechanical collision.
Solution: Replace the connector directly (do not force correction to avoid pin breakage).
Technical Note: Regular on-site maintenance (wiping dust, checking locking tightness) can effectively reduce poor contact faults; for connectors used in dusty/humid environments, install dust caps when not in use to avoid oxidation and contamination of pin and socket ends.
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