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CONFIDENTIAL
Service & Analysis Center Europe
Training Team
version 1.0 / 05.11.1999 Page 16 of 37
N200 COBBA faulty /solder balls broken
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Check VBB 2,8V DC on C117 near to CCONT
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Check VCOBBA 2,8V DC C148 near to COBBA
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Check COBBACKL 13MHz 3,2Vpp on J 201 (see the diagram below)
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Check COBBA reset impulse during the initialisation routine on J343 (see the diagram below)
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Change COBBA and write the IMEI and SIM-LOC DATA back to the phone
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If the error persist, the MAD or the Board should be the reason
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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
Figure 3: 13MHz Clock signal for the COBBA
Figure 4 Measurement point J343 COBBA RESET