Power Up Faults - Nokia NKC-1X Series Troubleshooting Instructions

CCS Technical Documentation
Note: The phone's ESN has to re-written to the UEM, if the UEM is replaced. This
can be done only in Central Service.
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
• Reset releasing delay
• Supply voltages stabilize to their UEM HW default values
Issue 1 02/03
source in RF
Nokia Corporation
Troubleshooting Instructions
NKC-1X
Page 5