Our service book is in English only Below you can find index of the book: Chapter 1 Disassembly Instructions for Nokia 8850 Mobile Phone Chapter 2 Typical Circuits Analysis for Nokia 8850 Mobile Phone 2.1 Power Supplies 2.1.1 Power Distribution 2.1.2 Power UP and Power Down 2.1.3 Charging 2.1.4 Watchdog 2.1.5 Modes of Operation 2.1.6 Clock Circuitry 2.2 RF Module 2.2.1 Receiver 2.2.2 Transmitter 2.2.3 Frequency Syntesizer 2.3 Audio and Logic control 2.3.1 Audio Control 2.3.2 Memories 2.3.3 Digital control 2.4 User interface 2.4.1 Display Circuit 2.4.2 Keyboard 2.4.3 Backlighting 2.4.4 Buzzer 2.4.5 Speaker 2.4.6 Microphone 2.4.7 Vibra Alerting Device 2.4.8 IR Module 2.4.9 SIM card connector Chapter 3 Trouble Test and Troubleshooting for Nokia 8850 Mobile Phone 3.1 Test Points and Testing 3.1.1 PCB 3.1.2 RF Part 3.1.3 Power Supplies 3.2 Troubleshooting 3.2.1 Phone is totally dead 3.2.2 Flash programming fails 3.2.3 Power doesn't stay on or phone is jammed 3.2.4 SIM related faults 3.2.5 Audio faults 3.2.6 Charging fault 3.2.7 System Clock 3.2.8 Sleep Clock |