Power key and system powerup

When the battery is placed in the phone the power key circuits are energized. When the power key is pressed, the system boots up (if an adequate battery voltage is present). Power down can be initiated by pressing the power key again (the system is powered down with the aid of SW). The power key is connected to EM ASIC N2200 (AVILMA) via PWRONX signal. (dead) mode means that the main battery is not present or its voltage is too low (below N2200 AVILMA master reset threshold) and that the...

Battery information

Note A new battery's full performance is achieved only after two or three complete charge and discharge cycles The battery can be charged and discharged hundreds of times but it will eventually wear out. When the operating time (talk-time and standby time) is noticeably shorter than normal, it is time to buy a new battery. Use only batteries approved by the phone manufacturer and recharge the battery only with the chargers approved by the manufacturer. Unplug the charger when not in use. Do not...

Phoenix audio loop tests and test results

The results presented in the table apply when no accessory is connected and battery voltage is set to 3.7V. Earpiece, internal microphone and speaker are in place during measurement. Applying a headset accessory during measurement causes a significant drop in measured quantities. The gain values presented in the table apply for a differential output vs. single-ended differential input.

Tx power level tuning GSM Context

Because of variations at the IC Integrated Circuit process and discrete component values, the actual transmitter RF gain of each phone is different. Tx power level tuning is used to find out mapping factors called 'power coefficients'. These adjust the GSM transmitter output power to fulfill the specifications. For EDGE transmission, the bias settings of the GSM PA are adjusted in order to improve linearity. This affects the PA gain and hence the power levels have to be aligned separately for...

Glossary

Application DPS expected to run high level tasks Automatic gain control maintains volume Average revenue per user per month or per year Application Specific Integrated Circuit Application Specific Interface Protector Board to board, connector between PWB and UI board Bi-quadratic type of filter function MCU controlled serial bus connected to UPP_WD2, UEME and Zocus Cellular DSP expected to run at low levels Connected limited device configuration...

General RF troubleshooting Introduction to RF troubleshooting

Soldered metal shieldings and components below them are not allowed to be changed or removed. The purpose of the following troubleshooting document is only to identify possible RF faults and advice how to tune the phone if it is necessary. All measurements should be done using spectrum analyser with a high-frequency high-impedance passive probe LO- reference frequencies and RF power levels oscilloscope with a 10 1 probe DC-voltages and low frequency signals Caution A mobile phone WCDMA...