MSM bus bridges support peripherals that do not have an AHB interface. The mobile terminal supports standard Nokia 2-wire and 3 wire chargers (AC-3, AC-4, DC-4). However, the 3-wire chargers are treated as 2-wire chargers. The pulse width modulation (PWM) controls signal for controlling the 3-wire charger is ignored.
20ms and is sent to MSM. Resets are generated for the MSM’s internal MCU and its internal DSP, and MSM sends TCXO_ON (“TCXO_EN” pin in 1265 schematic) signal to PM to enable TCXO. After PON_RESET_N goes high, MSM holds PS_HOLD at low state for 200ms and then drives PS_HOLD to high state.
When the power key is pressed, the PM enters the power-up sequence. Pressing the power key causes the KPD_PWR_N (PHONE_ON_N pin in 1265 schematic) pin to GND. The KPD_PWR_N signal is not part of the keypad matrix. The power key is only connected to the PM.
Charging Operation Battery The 1265 uses a Lithium-Ion cell battery with a capacity of 860 mAh. QSC6010 reads the resistor inside the battery pack on the BSI line to identify the battery size. Different charging algorithm will be used for different battery sizes. The resistors are connected to the BSI pin inside the battery connector.
Baseband Description and Troubleshooting Charger Detection Connecting a charger creates a voltage on the VCHG (“VEXT_DC” pin in 1265 schematic) input of the PM. Charging starts when the PM detects the VCHG input voltage level above 3.3V (Min. working voltage of VCHG pin).
The baseband supports 2 microphone inputs and three receiver (earpiece)/ speaker outputs. MIC+ & MIC- inputs of 1265 schematic are used for the mobile terminal's internal microphone. JACK_MIC+ & JACK_MIC- input are used for headsets. Every microphone input can have either a differential or single-ended AC connection to the QSC6010 circuit.
The mobile terminal uses a white and black LCD. The interface uses a parallel bus to transfer the Command/ Data between QSC6010 and LCD. The panel for 1265 is a 96x65dot matrix FSTN LCD module. It has a FSTN panel composed of 96 segments and 65 commons. The LCD interface uses parallel bus for controlled Command/ Data .
The mobile terminal supports Nokia standard 2.5mm mono headset. The headset insertion to the mobile terminal is detected through pin 4 (HS_DET) of the headset Jack, J580. HS_DET (“JACK_SENSE” pin in 1265 schematic) is low when headset not inserted. It becomes high when headset is inserted.
1265 (RH-103) Nokia Customer Care Baseband Description and Troubleshooting Mobile Terminal is Dead Mobile Terminal is Dead ♦ If current is zero, check L208, Q209, R214 and check the power on sequence. If there is no power output, Reheat solder joints or...
1265 (RH-103) Nokia Customer Care Baseband Description and Troubleshooting Power Does Not Stay ON or the Mobile Terminal is Jammed Mobile Terminal is Jammed Measure VREG_MSMP, Check VPH_PWR, VREG_MSMP, VREG_MSMC, Repair capacitors, reheat VREG_MSMC, VREG_MSMA, VREG_MSMA, and solder joints/ change and VREG_TCXO capacitors.
1265 (RH-103) Baseband Description and Troubleshooting Charger Faults Charger Faults Connect the charger and make sure the battery is connected. Check/ changeJ202, Check the “BSI” line. C225, R224. Is it about 75k Ohm or 81k Ohm? Measure voltage Check/ change DC Jack, at D205.