PAMS Technical Documentation NSM–3 Series Transceivers Disassembly & Troubleshooting Instructions Issue 1 12/1999 Nokia Mobile Phones Ltd.
NSM–3 Disassembly & Troubleshooting Instructions PAMS Technical Documentation CONTENTS Disassembly of NSM–3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Transceiver Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Baseband Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . PCB Test Points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
NSM–3 Disassembly & Troubleshooting Instructions PAMS Technical Documentation Disassembly of NSM–3 1. Remove battery. Step 1. Press the button at the bottom of the phone. Step 2. Slide the cover downwards and the cover will be released. 2. Step 3. Lift the battery first from the bottom end. Step 4. Remove the battery. 3. Remove the SIM card from its location. 4. Remove A–cover. Step 1. Press the button on the top of the phone. Step 2. Pull A–cover apart. NOTE snap fixings at the lower end of A–cover.
NSM–3 Disassembly & Troubleshooting Instructions 4 5 PAMS Technical Documentation 5. 6 To remove the PCB from the housing remove the 6 screws. NOTE: Here is shown the assembly order. 1 NOTE: When assembling the screws, use 17 Ncm torque. 2 3 6. Remove the PCB from B–cover. Parts can be separated. 7. Latch and latch spring can be separated after removal of the left A–cover fixing. 8. 1. 1. When taking the PCB and UI module apart remember the snap fixings on both sides of the LCD.
PAMS Technical Documentation NSM–3 Disassembly & Troubleshooting Instructions 10. Remove the RTC battery from its housing in UI module. 11. Remove the volume switch and key from the B–cover housing. 12. Remove the battery connector from its housing using SRT–3 tool. 13. Remove the antenna by releasing the snap fixings at both sides of the phone. Issue 1 12/1999 Nokia Mobile Phones Ltd.
NSM–3 Disassembly & Troubleshooting Instructions PAMS Technical Documentation 14. Remove the SIM spring by releasing the fixings at both ends of the spring. Main parts of the phone disassembled. Page 6 Nokia Mobile Phones Ltd.
NSM–3 Disassembly & Troubleshooting Instructions PAMS Technical Documentation Transceiver Troubleshooting Baseband Troubleshooting Because of the underfilling of the MAD and combo memory, it is impossible to change those.
NSM–3 Disassembly & Troubleshooting Instructions Page 8 PAMS Technical Documentation Reference Signal Note J241 MCUWRX MCU WRITE MAD (D200) –> COMBO MEMORY (D210) J242 MCUAD1 MCU ADDRESS LINE 1 MAD (D200) –> COMBO MEMORY (D210) J245* R205# SCLK HAGAR (N505) SERIAL CLOCK MAD (D200) –> HAGAR (N505) J250 COBBA CSX COBBA (N250) CHIP SELECT MAD (D200) –> COBBA (N250) J251 COBBA SDA COBBA (N250) SERIAL BUS DATA MAD (D200) <–> COBBA (N250) J252 COBBA CLK COBBA (N250) SERIAL BUS CLOCK MAD (D2
NSM–3 Disassembly & Troubleshooting Instructions PAMS Technical Documentation Reference Signal Note N310 PIN 6 BUZZER_CTRL N310 PIN 7 KBLIGHTS N310 PIN 8 LCDLED_ADJ LCD BACKLIGHT BRIGHNESS ADJUSTMENT R310 –> UI–SWITCH (N310) N310 PIN 9 LCD LIGHT LCD LED LIGHT CURRENT UI–SWITCH (N310) –> DISPLAY BACKLIGHT LEDS N400 PIN 4 IRONX N401 PIN 4 IRDA POWER R118 PWRONX R206 SENA R211 VPP FLASH PROGRAMMING VOLTAGE N220 –> COMPOMEMORY (D210) R277 EAD ACCESSORY DETECTION XMICP –> CCONT (N100)
NSM–3 Disassembly & Troubleshooting Instructions PAMS Technical Documentation Troubleshooting Troubleshooting instructions are divided into following sections: How to check/fix the system/sleep clock. How to check/fix the power supplies. Contact service case. How to check/fix the SIM faults. How to check/fix the Audio faults. How to check/fix the charger faults. The first thing to do is to carry out a thorough visual check of the module.
PAMS Technical Documentation NSM–3 Disassembly & Troubleshooting Instructions System Clock Check the signal from the C213 Layout picture B signal RFC, should be like in SYSTEM CLOCK picture. IF NOT Check the signal from the RF side buffer input C829. If there is signal, check the R829,R834,R830,V800, C834 and L800 IF THERE ISN’T Check the signal from the RF sideIF IS oskilator VCXO G830 output fron C833. There should be 26MHz signal.
NSM–3 Disassembly & Troubleshooting Instructions PAMS Technical Documentation Sleep Clock Check the signal from the J228 Layout picture B signal Clk 32kHz, should be like in SLEEP CLOCK picture. IF NOT Check R100, R154, R102, C102, C101, C113 and B100 IF OK Change the CCONT N100 Sleep clock picture. Page 12 Nokia Mobile Phones Ltd.
NSM–3 Disassembly & Troubleshooting Instructions PAMS Technical Documentation Power Supplies Measure power supplies. Test points are shown in layout picture A. Layout shown here is NSM–2. A Vbat Vbb Vcore Vsyn2 Vsyn1 VTX VRX Vcobba Vref VXO Issue 1 12/1999 Nokia Mobile Phones Ltd.
NSM–3 Disassembly & Troubleshooting Instructions Vbb Vcore Vcobba Vref Vbat VXO VRX VTX Vsyn1 Vsyn2 PAMS Technical Documentation = 2.7V – 2.87V = 1.3V – 2.65V = 2,67V – 2.85V = 1.48V – 1.523V = 3.11V – 4.2V = 2,67V – 2.85V = 2,67V – 2.85V = 2,67V – 2.85V = 2,67V – 2.85V = 2,67V – 2.85V Power up sequence test: Cconts digital parts keep MAD in reset by keeping PURX down for a delay of 62ms. Here is shown the start up sequence picture.
NSM–3 Disassembly & Troubleshooting Instructions PAMS Technical Documentation B Xf CLK 32 kHz PURX Ccont int. VXO Pwr ESysResetX RFC MCUAd1 MCUWrX MBUS Issue 1 12/1999 FBUSTx FBUSRx ROM1SelX MCURdX Nokia Mobile Phones Ltd.
NSM–3 Disassembly & Troubleshooting Instructions PAMS Technical Documentation Phone is totally dead The phone doesn’t take current at all when the power switch is pressed or when the watchdog disable pin (X001 pin 11) is grounded. Make sure that the battery voltage you use is within the specification, i.e. 3.11 .. 4.2 V. If the voltage is lower, hardware of CCONT (N100) prevents power on. IF battery voltage is inside the specification Change the CCONT.
PAMS Technical Documentation NSM–3 Disassembly & Troubleshooting Instructions 1. MCU ROM checksum Calculates 16 bit checksum out of Flash code and compares it to one found in Flash. Items being checked are: MAD2 <––> Flash data and address lines, CE0,CE1, WE, BYTE, Vcc, GND, Flash internal functionality 2. MCU RAM interface 3. MCU RAM component 4. MCU EEPROM interface 5. MCU EEPROM component 6. RTC battery 7. CCONT interface 8. A/D converter 9. SW reset A. Power off B. Security data C.
NSM–3 Disassembly & Troubleshooting Instructions PAMS Technical Documentation SIM related faults The hardware of the SIM interface from MAD2 (D200) to the SIM connector (X302) can be tested without a SIM card. When the power is switched on and the BSI line is grounded by a resistor, all the used lines (VSIM, RST, CLK, DATA) rise up to 5 V four times. Thus “Insert SIM card” faults can be found without SIM card.
NSM–3 Disassembly & Troubleshooting Instructions PAMS Technical Documentation Audio faults earpiece doesn’t work and there isn’t any mechanical problem Check R 292, R291, L272 and L271 OK Change the COBBA N250 Microphone doesn’t work and there isn’t any mechanical problem Check the voltage in resistor R267 RF side head. Voltage should be about 2.1V Check R266, C268, L287 and V250 OK Check the R268,C 274,C263,C278 and C262 Issue 1 12/1999 OK Change the COBBA N250 Nokia Mobile Phones Ltd.
NSM–3 Disassembly & Troubleshooting Instructions PAMS Technical Documentation Headset earpiece doesn’t work and there isn’t any mechanical problem Check R 257,R256, R270, L284, L283 C284, C283, C 296, C 297, C261and C255 OK Change the COBBA N250 Headset earphone doesn’t work and there isn’t any mechanical problem Check R 257,R256, R270, L284, L283 C284, C283, C 296, C 297, C261and C255 OK Change the COBBA N250 Page 20 Nokia Mobile Phones Ltd.
PAMS Technical Documentation NSM–3 Disassembly & Troubleshooting Instructions Charging fault Display ” not charging” Check charge voltage with wintesla Check F101, V100,R104 and R103 OK Check charge current with wintesla IF NOT OK Check V101 and R131 Issue 1 12/1999 OK Change the Chaps N101 Nokia Mobile Phones Ltd.
NSM–3 Disassembly & Troubleshooting Instructions PAMS Technical Documentation RF Troubleshooting Layout shown here is NSM–2. PA_PCN_out PA_in ant_sw_IN PA_GSM_out ant_sw_ctrl (PCN) PA_ctrl (GSM) ant_sw_ctrl (GSM) RX_GSM (lna_in) PA_ctrl (PCN) RX_PCN (lna_in) PA_buff_in TXI RX_PCN (balun_in) TX_balout(PCN) TXC TCXO/2 (13 MHz) TX_balout(GSM) RX_GSM (balun_in) Vchp AFC 5V5 1.35V (RX) VCO_out 1.2V (RX) RXI (filt) TCXO (26 MHz) VCO_ctrl RXQ (filt) TXQ Vtcxo +1.
