Display Shows "Contact Service; The Phone Does Not Register To The Networks, Or The Phone Cannot Make A Call - Nokia RM-392 Service Manual

RM-392; RM-393
Baseband Troubleshooting Instructions

Display shows "Contact Service"

Troubleshooting flow
This error can only happen at power up where several self-tests are run. If any of these test cases fails the
display will show the message: "Contact Service".
They are individual test cases, so the below lineup of error hunting's has no chronological order. Use common
sense and experience to decide which test case to start error hunting at.
Figure 13 Troubleshooting when the "Contact Service" message is seen

The phone does not register to the networks, or the phone cannot make a call

Context
If the phone doesn't register to the network, the fault can be in either BB or RF. Only few signals can be tested
since several signals are 'buried' in one or more of the inner layers of the PWB.
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