Tx-p, Ower or to low – Nokia 3210 User Manual
Page 33
CONFIDENTIAL
Service & Analysis Center Europe
Training Team
version 1.0 / 05.11.1999
Page 33 of 37
Figure 10:RX-Control Signal
Call breaks / No service
G701 13MHz Oscillator out of range or high spurious emission
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Set the handset to call mode, check if some phase and frequency errors appear special in GSM 1800 band
The deviations will be higher the higher the traffic channel is!
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Change the G701 13MHz Oscillator
COBBA N200 broken solder balls
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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 in chapter "COBBA contact service" )
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Check the module in call modus with a simulator.
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Knock very careful with something no metalled around the COBBA
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Check if some errors appear on the tester (phase /frequency / RX-Quality/TX-Power level)
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Check the COBBA IC with a microscope, the first broken balls are normal on the corners from circuit.
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Change the circuit with a μBGA solder machine