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

NPC-1
Troubleshooting Instructions

Transceiver Troubleshooting

The Troubleshooting instructions are divided into following sections:
1 How to check/fix the system/sleep clock.
2 How to check/fix the power supplies.
3 Contact service case.
4 How to check/fix the SIM faults.
5 How to check/fix the Audio faults.
6 How to check/fix the charger faults.
The first thing to do 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 68k
Local 560_ (<1k_)
Test > 1k
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:
Page 4
Table 1: Phone operating mode
BTEMP resistor
47k
Whatever
560_ (<1k_)
ãNokia Corporation
PAMS Technical Documentation
Remarks
Recommended for baseband test-
ing. Same as local mode, but mak-
ing a phone call is possible.
Issue 1 10/01