Nokia 8850 Service Manual distrble
PAMS Technical Documentation
NSM–2 Series Transceivers
Disassembly &
Troubleshooting
Instructions
Issue 1 12/1999 Nokia Mobile Phones Ltd.
NSM–2
Disassembly & Troubleshooting Instructions
PAMS Technical Documentation
CONTENTS
Disassembly of NSM–2 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Transceiver Troubleshooting 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Baseband Troubleshooting 7. . . . . . . . . . . . . . . . . . . . . . . . . . . .
PCB Test Points 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Testing 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
System Clock 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Sleep Clock 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Supplies 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Phone is totally dead 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Flash programming fails 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power doesn’t stay on or phone is jammed 16. . . . . . . . . . . .
Contact Service on the phone display 16. . . . . . . . . . . . . . . . .
SIM related faults 18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Audio faults 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Charging fault 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RF Troubleshooting 22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Page 2
Nokia Mobile Phones Ltd.
Issue 1 12/1999
PAMS Technical Documentation
Disassembly of NSM–2
Remove battery.
Step 1. Press the button on the side.
1.
Step 2. Slide the cover downwards and
the cover will be released.
2.
NSM–2
Disassembly & Troubleshooting Instructions
Step 3. Lift the battery first
2.
from the lower end.
Step 4. Remove the battery.
3.
1.
Remove the SIM card from its location.
4.
Step 1. Open the slide cover.
Step 2. Push the slide edge outwards.
NOTE: Use only numbered side 2 to release the slide.
Step 3. Lift the slide up simultaneously and the slide
will be released.
Issue 1 12/1999
Remove the slide cover.
Nokia Mobile Phones Ltd.
3.
2.
1.
Page 3
NSM–2
Disassembly & Troubleshooting Instructions
PAMS Technical Documentation
Remove the antenna.
Remove A–cover, speaker
7.
and power button.
5.
Step 1. To remove the antenna, push with the thin spike
of SRT–3 (Battery Connector Extractor Tool) forward to
release the snaps.
Step 2. Release snap fixing using screw driver.
Step 3. Lift up the antenna.
NOTE: Models with no hole in the frame, push firmly the
antenna (1. arrow direction) to release the snaps. Use
screw driver to release snap fixing (2. arrow). Lift up the
antenna (3. arrow).
NOTE: Be careful not brake the middle frame.
6.
Remove the frame
screws (4 pcs).
Screws are numbered according to
the tightening order.
4
3
NOTE: When
assembling the
screws, use 17
Ncm torque.
8.
2
1
Remove keymat module
screws (2 or 3pcs depending on the model).
Page 4
NOTE: When assembling the
screws, use 17 Ncm torque.
Nokia Mobile Phones Ltd.
Issue 1 12/1999
PAMS Technical Documentation
Disassembly & Troubleshooting Instructions
Push SW/slide switch before removing
the keymat module. Now remove the
9.
keymat module and rtc–battery.
NOTE: Be careful not to damage the
SW/slide switch on the PCB.
NSM–2
10.
Parts can be separated:
– lcd module
– PCB
– buzzer rubber
– metal gasket
– bottom connector
– SIM connector
– vibra
Issue 1 12/1999
Nokia Mobile Phones Ltd.
Page 5
NSM–2
Disassembly & Troubleshooting Instructions
Remove the volume switch 1.
11.
Remove the volume key 2.
PAMS Technical Documentation
12.
Turn the phone around.
Press down battery conector springs
using Battery Connector Extractor Tool.
Battery connector will be released.
13.
Release the latch snap.
Remove the latch and latch spring.
Page 6
Nokia Mobile Phones Ltd.
Issue 1 12/1999
PAMS Technical Documentation
Disassembly & Troubleshooting Instructions
Transceiver Troubleshooting
Baseband Troubleshooting
Because of the underfilling of the MAD and combo memory , it is impossible
to change those.
PCB Test Points
Reference Signal Note
C213 RFC MAIN CLOCK (13MHz)
J100* PWM CHARGE CURRENT CONTROL
J101 FBUSTX FBUS TRANSMITTED DA TA
NSM–2
HAGAR (N505) –> MAD (D200)
CCONT (N100) –> CHAPS (N101)
MAD (D200) –> SERVICE INTERFACE
J102 FBUSRX FBUS RECEIVED DA TA
SERVICE INTERFACE –> MAD (D200)
J103 MBUS ONE WIRE TWO DIRECTION SERIAL BUS
(9600 BIT/S)
MAD (D200) <–> SERVICE INTERFACE
J104 CCONT CSX CCONT (N100) CHIP SELECT
MAD (D200) –> CCONT (N100)
J223 CCONT INT CCONT (N100) INTERRUPT
MAD (D200) –> CCONT (N100)
J226 VCXOPWR 26MHz SYSTEM CLOCK CONTROL
MAD (D200) –> VCXO (G830)
J227 PURX POWER UP RESET
CCONT (N100) –> MAD (D200)
J228 SLEEPCLK SLEEP CLOCK (32kHz)
CCONT (N100) –> MAD (D200)
J230 GND GROUND
J234* HAGAR _RESET_X HAGAR (N505) RESET
MAD (D200) –> HAGAR (N505)
J235 ROM1SELX FLASH CHIP SELECT
MAD (D200) –> COMBO MEMORY (D210)
J236 RAMSELX RAM CHIP SELECT
MAD (D200) –> COMBO MEMORY (D210)
Issue 1 12/1999
J237 SYNTHDATA
(SDATA)
J239 DSPXF NOT CONNECTED
J240 MCURDX MCU READ
J241 MCUWRX MCU WRITE
J242 MCUAD1 MCU ADDRESS LINE 1
HAGAR (N505) SERIAL DA TA
MAD (D200) –> HAGAR (N505)
MAD (D200) –> COMBO MEMORY (D210)
MAD (D200) –> COMBO MEMORY (D210)
MAD (D200) –> COMBO MEMORY (D210)
Nokia Mobile Phones Ltd.
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