Transceiver Troubleshooting; Baseband Troubleshooting; General About Testing; Troubleshooting - Nokia NKC-1X Series Troubleshooting Instructions

NKC-1X
Troubleshooting Instructions

Transceiver Troubleshooting

The first thing to do when you are encountered with a problem is to carry out a thorough
visual check of the module. Make sure that:
• there are no mechanical damages
• the solder joints are OK
Note: Before changing anything, ALL SUPPLY VOLTAGES AND THE SYSTEM
CLOCK / SLEEP CLOCK should be checked.

Baseband Troubleshooting

General about testing

The phone has three different modes for testing and/or repairing the phone. The modes
can be selected with suitable resistors connected to BSI- and BTEMP- lines as illustrated
in the table below:
Mode BSI-resistor
Normal
Local
Test
If the corresponding resistors are connected, the MCU software automatically enters into
the local or test mode when the supply voltage is connected to the phone.
The power can be switched on by:
1 Pressing the power key.
2 Connecting the local/test mode resistors to the bsi/btemp lines and connecting
the battery voltage to the phone.
3 Connecting a charger.
4 Phone's internal functions (Real time clock alarm)
In the local and test mode, the baseband can be controlled through MBUS or FBUS (FBUS
is recommended) connections using Phoenix service software.

Troubleshooting

Note: Most of the baseband repair actions require removing the baseband shield.
The shield must not be removed unless separately authorized by the program.
Page 4
Table 1: Phone operating mode
BTEMP resistor
68k 47k
560_ Whatever
(<1k_)
> 1k 560_ (<1k_)
Nokia Corporation
CCS Technical Documentation
Remarks
Recommended for baseband testing. Same as local
mode, but making a phone call is possible.
Issue 1 02/03