PAMS
Technical Documentation
NSE–6
Disassembly & Troubleshooting Instructions
Page 5
Original 08/98
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:
1. Pwr key or
2. BTEMP line or
3. Charger
In the local mode the baseband can be controlled through MBUS or FBUS
connections by a PC–locals software. Baseband internal connections are
tested with self tests if possible. By connecting MAD2 pin ROW5 to ground,
MAD2 pins are toggled as a daisy chain, which can be used for detecting
short circuits in MAD2 pins. Test pads are placed on engine pcb for service
and production troubleshooting purposes in some supply voltage and signal
lines.
Alignments
Within alignment those parameters are adjusted, that cannot be set accurate
enough by design because of component tolerances. Due to use of 5% resis-
tor values, the channels of the CCONT A/D converters need to be aligned
in the production phase. Within battery voltage tuning the MCU software
reads the A/D reading from CCONT at 4.1V and stores this reading to EE-
PROM memory as a reference point. Another reference point is created by
assuming that while the input voltage is zero, A/D reading is also zero. Now
the slope is known and A/D readings can be calibrated. Calibration is in-
cluded in VBAT A/D reading task.
Battery charging voltage VCHAR and current ICHAR are calibrated using
one test setting. Test jig in production/service must have a connection to bat-
tery terminals. ICHAR and VCHAR are supplied fron the jig and service soft-
ware calculates values, which are then stored to EEPROM.