Nokia 3210 - 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
• 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!
• Change the G701 13MHz Oscillator
COBBA N200 broken solder balls
• 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 (see the diagram in chapter "COBBA contact service" )
• Check the module in call modus with a simulator.
• Knock very careful with something no metalled around the COBBA
• Check if some errors appear on the tester (phase /frequency / RX-Quality/TX-Power level)
• Check the COBBA IC with a microscope, the first broken balls are normal on the corners from circuit.
• Change the circuit with a μBGA solder machine