Specifications

iPhone 4 Troubleshooting — Cleaning Procedures 23
2012-02-21
Headphone Jack
Foreign material in the headphone jack can cause audio or functional issues, such as:
• iPhone is stuck in headphone mode and no audio is heard from receiver or speaker.
• Headphone audio is distorted (static or crackles) or is not functioning.
• Headphone audio is only heard in one channel.
• Headphone microphone has distorted sound or is not functioning.
WARNING: Do not use long metal tools (such as screwdrivers or dental picks) while
cleaning inside the headphone jack, as this could lead to battery puncture.
1. Insert headphone plug into jack and verify that it can be inserted fully.
2. Use a lighted otoscope or magnifying glass to inspect for debris that may be causing issues.
3. Use an anti-static brush to brush out lint or debris. Use just enough bristles to t inside the
headphone jack, and twist the bristles to loosen and lift out debris.