Baseband Testing; Alignments - Nokia NSW-6 Series Disassembly & Troubleshooting Instructions

PAMS Technical Documentation

Baseband Testing

The MCU software enters a local mode at start-up if suitable resistors are
connected to the BTEMP and BSI lines.
NOTE! Baseband doesn't wake up automatically when the battery voltage
is connected. Power must be switched on via:

Alignments

Within alignment those parameters are adjusted, that cannot be set accu-
rate enough by design, because of component tolerances.
Due to use of 5% resistor values, the channels of the CCONT A/D con-
verters need to be aligned in the production phase.
Within battery voltage tuning VBAT the MCU software reads the A/D read-
ing from CCONT at 4.1 V and stores this reading to EEPROM (emulated
by Flash) memory as a reference point. Then second reading is done at
3.1 V. Now the slope is known and A/D readings can be calibrated. Ca-
libration is included in VBAT A/D reading task.
Battery charging voltage VCHAR and current ICHAR are calibrated using
one test setting. Test jig in production line must have a connection to bat-
tery terminals. ICHAR is adjusted to 500 mA and VCHAR to 8.4 V with
appropriate load connected to the battery terminals.
Issue 1 12/99
1. Pwr key or
2. BTEMP line or
3. Charger
4. Connecting J150 to ground
E Nokia Mobile Phones Ltd.
Disassembly & Troubleshooting
NSW-6
Page 11