Apple MC408LL Apple Technician Guide - Page 69

Deep Dive Check 1. Verify whether boot chime is present when system is powered ON. Note: make sure audio output preferences are not set to mute and volume is set to mid-range. 2. Launch System Preferences and select Sound/Output options. Set speaker balance to the middle, then play a sound file. Verify that sound is generated by the speaker and that the sound quality is acceptable.. 3. Verify whether customer reported audio issue has been resolved. Result Yes No Yes No Yes No Action Go to step 2 Insert headphones into audio out jack and retest. If issue persists, replace logic board Speaker and amplifier circuitry OK. Go to step 3. Replace speaker. Issue no longer present. Return system to customer. Go to step 4. 4. Boot system from Mac mini Install DVD, from a similar Mac mini setup as FireWire Target Disk mode, or from another bootable volume with an up to date system software. Verify whether issue still occurs. Yes Go to step 5. No Known good boot volume works OK. Troubleshoot for software issue. Isolate whether issue is application specific or whether possible operating system conflict. Make sure user data backed up before removing or reinstalling software. 5. Connect external speakers to Headphone Out port and set System Preferences Sound/Output to external speakers, then play a sound file. Verify that sound quality is acceptable. Yes Logic board, internal speaker, and external headphone port functioning correctly. Return system to user. No replace logic board Code M09 X08 M09 2010-08-03 Mac mini (Mid 2010) Symptom Charts - Input/Output Devices 69