Nokia nsm-4, 8855 Troubleshooting Instruction
PAMS Technical Documentation
NSM–4 Series Transceivers
Disassembly &
Troubleshooting
Instructions
Issue 1 01/2002 Nokia Corporation
NSM–4
Disassembly & Troubleshooting Instructions
PAMS Technical Documentation
CONTENTS
Disassembly of NSM–4 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Transceiver Troubleshooting 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Baseband Troubleshooting 10. . . . . . . . . . . . . . . . . . . . . . . . . . . .
PWB Test Points 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Testing 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
System Clock 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Sleep Clock 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Supplies 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Phone is totally dead 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Flash programming fails 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power doesn’t stay on or phone is jammed 19. . . . . . . . . . . .
Contact Service on the phone display 19. . . . . . . . . . . . . . . . .
SIM related faults 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Audio faults 22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Charging fault 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RF Troubleshooting 25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Page 2
Nokia Corporation
Issue 1 01/2002
PAMS Technical Documentation
Disassembly of NSM–4
NSM–4
Disassembly & Troubleshooting Instructions
Issue 1 01/2002
NSM–4 phone disassembled.
Nokia Corporation
Page 3
NSM–4
Disassembly & Troubleshooting Instructions
1.
PAMS Technical Documentation
1.
Step 1. Press the button on the side.
Step 2. Slide the cover downwards and
it will be released.
Remove battery.
3.
2.
Step 3. Lift the battery first from the
lower end. Remove the battery.
Page 4
Nokia Corporation
Issue 1 01/2002
PAMS Technical Documentation
NSM–4
Disassembly & Troubleshooting Instructions
1.
2.
3.
Step 1. Open the slide cover.
Remove the SIM card from its location.
Remove the slide cover.
2.
Issue 1 01/2002
3.
Nokia Corporation
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.
Page 5
NSM–4
Disassembly & Troubleshooting Instructions
PAMS Technical Documentation
1.
4.
Step 1. To remove the antenna, push with the
thin spike of SRT–3 (Battery Connector Extractor Tool) forward to release the snaps and lift
up the antenna.
NOTE: Be careful not brake the middle frame.
1
3
5.
Remove the frame screws (4 pcs). Screws are
numbered according to the tightening order.
2
4
NOTE: When assembling the screws,
use 14 Ncm torque.
Remove the antenna.
Remove the A–cover.
A–cover can now be removed.
Remove speaker if needed.
Page 6
Nokia Corporation
Issue 1 01/2002
PAMS Technical Documentation
NSM–4
Disassembly & Troubleshooting Instructions
6.
Remove keymat module screws (2 pcs).
NOTE: When assembling the
screws, use 17 Ncm torque.
Push SW/slide switch before removing
the keymat module. Now remove the
keymat module.
NOTE: Be careful not to damage the
slide switch on the PWB.
Keymat module removed.
Remove the keymat module.
7.
Push from the side to release the PWB.
To remove the display release the snap fixings in the display module.
Remove PWB and display.
Issue 1 01/2002
Nokia Corporation
Page 7
NSM–4
Disassembly & Troubleshooting Instructions
Main frame and PWB apart.
Following parts can be separated from the
main frame:
– bottom connector
– SIM connector
– vibra
– metal gasket
PAMS Technical Documentation
8.
Turn the phone around.
Press down battery connector springs
using SRT–3 (Battery Connector Extractor Tool). Battery connector will be
released.
9.
Remove first the volume switch.
Then remove the volume key.
Remove battery connector.
Remove volume switch and key.
Page 8
Nokia Corporation
Issue 1 01/2002
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