Flash Programming (1) - Nokia NSB-1 Series Troubleshooting Instructions

NSB–1/3
Troubleshooting Instructions

Flash Programming (1)

connect watchdog disable (J114) to GND (J113)
Check
NO
Fault finding chart
for 13 MHz
oscillator
Check that following lines are correct from X131 to D200:
check also pullup and pulldown resistors: R200, R201, R123
Enable the selftest function of D200 by connecting
shortcircuit between testpoints J206 and J207
Connect an oscilloscope to testpoint J205 and switch
Voltage level rises to "1" after power on at testpoint J205
There could be open pins in circuits D200 (D211, D240)
If not, the PCB or D200 (D221, D210) is faulty
Page 6
Flash programming doesn't work
YES
If the fault information from the prommer is:
a) MCU doesn't boot
b) serial data line failure
c) serial clock line failure
connect:
OK
EEPROM (D230) pin8 (VBB) 2.8V
VVCXO 2.8V (G703, C721)
YES
J121 (Purx)="1" (2.8V)
YES
MAD2 pin 93 (J200): 13MHz sine wave
clock signal: 500 mVpp min.
YES
MBUS: X131 pin11 –> D200 pin112
FBUS_TX: X131 pin13 –> D200 pin104
FBUS_RX: X131 pin12 –> D200 pin109
GND : X131 pin 9 –> GND
OK
power on
YES
Technical Documentation
check
NO
WDDIS line –> N100 pin29
OK
See section: Phone is totally dead
Sleep clock (SCLK) J201
NO
square wave 32 kHz
YES
Faulty circuit N100
or over loaded PurX line
There is a shortcircuit
NO
somewhere in memory control
lines or MCU address lines or
MCU lower (7:0) data lines
Original 06/98
PAMS
check sleep
NO
clock circuitry
(B150,R197...)