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L202, L203 faulty
Check resistance from L202, L203 to the earphone pads normal 0
Check the resistance also from L202,L203 to ground and between both lines (normal high resistance >1M )
Speaker
No / quiet / distorted receiving audio signal
Check the mechanic of speaker, contacts, membrane, soiling
Check resistance of speaker (about 30 )
Microphone
No / quiet / distorted transmitting audio signal
Check contacts of microphone
Check resistance of microphone (about 800 )
Check the microphone voltage 1,7V DC on C242
Check the audio signal on C258 and C259
X503
Check microphone spring contacts
Check spring contacts to the board (change connector if bent)
Clean the contact pads on the board
N200 COBBA faulty
Check VBB 2,8V DC on C117 near to CCONT
Check VCOBBA 2,8V DC C148 near to COBBA
Check COBBACKL 13MHz 3,2Vpp on J 201
Check COBBA reset impulse during the initialisation routine on J343 (see the diagram "CONBBA RESET")
Change COBBA and write the IMEI and SIM-LOC DATA back to the phone
If the error persist the MAD or the Board (PCB) should be the reason
SWAP the handset because MAD is not changeable
Note! Rewrite SIMLOCK and IMEI entries with use of the Nokia security SW (SSSW) and make a SW-update or send
this phones to the SACE, if this procedure is not permitted to you
version 1.0 / 05.11.1999
CONFIDENTIAL
(wintesla/ Testing/ Audio/ internal/ Loop on)
Service & Analysis Center Europe
Training Team
Page 22 of 37
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