Nokia NSM-4 Series Disassembly & Troubleshooting Instructions page 20

NSM–4
Disassembly & Troubleshooting Instructions
1. MCU ROM checksum
Calculates 16 bit checksum out of Flash code and compares it to one
found in Flash.
Items being checked are:
MAD2 <––> Flash data and address lines, CE0,CE1, WE, BYTE, Vcc,
GND, Flash internal functionality
2. MCU RAM interface
3. MCU RAM component
4. MCU EEPROM interface
5. MCU EEPROM component
6. RTC battery
7. CCONT interface
8. A/D converter
9. SW reset
A. Power off
B. Security data
C. EEPROM tune checksum
D. PPM checksum
E MCU download DSP
F. DSP alive
G. COBBA serial
H COBBA parallel
I. EEPROM checksum
K. PPM validity
Page 20
E Nokia Corporation
PAMS Technical Documentation
Issue 1 01/2002