User Guide

PAMS Technical Documentation Troubleshooting Instructions
NSB-5
Issue 1 03/01 Nokia Mobile Phones Ltd. Page 13
the display. This may indicate open solder joints on components, faulty PCB, or other
damage to the phone has occurred.
“Contact Service” may also indicate that the flash software has become corrupted. The
phone may then require either a simple re-flash or, in some cases, a total erase and
re-flash.
Phone Doesn’t Register to the Network or Phone Doesn’t Make a Call
If the phone doesn’t register to the network or the phone doesn’t make a call, the reason
could be either a baseband or RF part.
Wintesla service software can be used to set the required mode and determine if the
fault is in the RF or baseband sections (RF interface measurements).
The control lines for the RF section supply both the System ASIC (MAD2;D300) and the
RFI (Cobba_GJP; N200). MAD2WD1 handles digital control lines (synthena, TxP, etc.) and
Cobba handles analog control lines (AFC, TxC, etc.)
The DSP software is constructed so that operation states of DSP (MAD2WD1) can be seen
in external flag (DSPXF) output pin J314.
After power-up, DSP signals all completed functions by changing the state of the XF pin
(see Figure 6, Figure 7, Figure 8, and Figure 9).
Figure 6: The states of DSP (MAD2) after power on
MAD2WD1 pin D8
(DSPXF)
1 2 3
1. DSP initialization
2.Synchronization to
network done
3. Registrarition to
network done.
J314