Flash Programming - Nokia NSE–3 SERIES Service Manual

NSE–3
Disassembly & Troubleshooting Instructions

Flash Programming (1)

connect watchdog disable (WDDIS) line (X001 pin 11) to the ground
check C213, R213
YES
NO
J506 (RFC) 13 MHz
800 mV min
NO
check buffer V705 and
VCXO G600
check also pullup and pulldown resistors: R203, R201, R215
Enable the selftest function of D200 by connecting
shortcircuit between testpoints J229 and J230
Connect an oscilloscope to testpoint J225 and switch
Voltage level rises to "1" after power on at testpoint J225
There could be open pins in circuits D200 (D211, D240)
If not, the PCB or D200 (D211, D240) is faulty
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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 (D240) pin 8 (VBB) 2.8 V
J522 (VXO) 2.8 V
YES
J227 master reset (Purx) = "1" (2.8 V)
YES
MAD2 (D200) pin 93: 13 MHz sine wave
clock signal: 500 mVpp min.
YES
Check that following lines are correct:
FCLK (MBUS) line: X001 pin 2 –> D200 pin 112
FTX (fbus_tx) line: X001 pin 1 –> D200 pin 104
FRX (fbus_rx) line: X001 pin 2 –> D200 pin 109
GND : X001 pin 7 –> GND
OK
power on
YES
Technical Documentation
check
NO
WDDIS line: X001 pin 11 –> N100 pin 29
OK
See section: Phone is totally dead
J228 sleep clock(SCLK)
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, 11/97
PAMS
check sleep
NO
clock circuitry
(B100, R154...)