Motorola Moto X Pure Edition Troubleshooting Manuals page 80

Headset Troubleshooting
- Inspect the headset jack socket J4900 and its components on the main PCB. (See
schematic in the previous slides) Verify that the socket and its contacts are free of
dirt, moisture, and other contaminants or foreign materials.
- Inspect the physical placement of U4800 and its related components on main PCB.
(See schematic in previous slides)
- Verify that the supply voltage VDD_FSA8500 (C4813, C4819) is 2.9 V DC.
- Verify that the supply voltage VIO_FSA8500 (C4821) is 1.8 VDC.
- Verify that the open circuit voltage on the headset socket SLEEVE contact is 2.9 V
DC. The SLEEVE contact voltage drops to about 2.1 V DC when a standard ("non
OMTP") headset with a microphone is plugged in.
- While playing media with a headset plugged in, use an oscilloscope verify that audio
signals are present on the TIP contact (left channel) and on the RING1 contact (right
channel). The expected amplitude is 150 mV maximum at the highest volume
setting.
MOTOROLA CONFIDENTIAL
Moto X Pure Edition/Moto X Style
Baseband TROUBLESHOOTING GUIDES