Power Up Faults - Nokia RH-41 Series Troubleshooting Instructions

RH-41
Troubleshooting Instructions
The BB troubleshooting instructions consist of the following topics:
1 Power up
2 Flash programming
3 Audio
• Earpiece
• Microphone
4 Charging
5 Accessory detection
6 Sleep clock
7 User interface
• Display
• Lights
• Buzzer
• Keyboard

Power up faults

Power up sequence
1 The UEM acts as a HW master during start up
• Vbatt limits: 2.1V for internal state machine, 3V triggering whole startup
• Regulator sequencing
• HW "core" regulators "on": Vio, Vcore, VR3, Vflash1
These regulators supply the processors, memory, chip interfaces and clock source in RF
• Reset releasing delay
• Supply voltages stabilize to their UEM HW default values
• RFCLK grows to full swing
• The core is ready to run but waiting for the PURX release
Page 6
Nokia Corporation
CCS Technical Documentation
Confidential Issue 2 09/2003