Nokia NSM-3 Series Disassembly & Troubleshooting Instructions page 21

NSM–3/3D
PAMS Technical Documentation
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
E Nokia Mobile Phones Ltd.
Page 21
Issue 3 11/2000