User's Manual

5.2. Vibration issue:
The vibrator circuit is simple, one point connected to VBAT and the other to
VIB_CTRL. VBAT voltage is approximately equal to battery voltage, and VIB_CTRL
voltage outputs from the core chip and is controlled by the software. When vibration
enabled, the differential voltage of the vibrator is close to 3.0 v, when vibration disabled,
the differential voltage is close to 0 v.
Repair steps:
1. Check whether the Vibrator is damaged and the soldering is well or not;
2. Check if the related circuits, ,have soldering issues, etc;
3. Replace with new Vibrator, and verify again;
4. Enable and disable vibration functions respectively, check whether both ends of the
Vibrator voltage are normal or not. If abnormal, check if the U0100 has soldering or
performance problems.
5.3. Keypad/side key function abnormity
There are keys totally. KEYOUT is output for row scan, and KEYIN is input for column
scan;
When some key is pressed, the column detects low level, CPU start the keypad scan program,
judge the key value,
and start the corresponding operation.