User Guide

NSB-5
Troubleshooting Instructions PAMS Technical Documentation
Page 8 Nokia Mobile Phones Ltd. Issue 1 03/01
Figure 2: Fault Finding for Flash Programming Errors
FLASH Programming
doesn't work.
Check if fault information from Prommer is one of the
following:
a) MCU doesn't boot
b) serial dataline failure
c) serial clock line failure
failure is one of the
above mentioned?
No
Yes
Connect watchdog disable (WDDIS R413
end towards N100) to GND.
C308 end away from B400 buzzer
and
C112 end towards N100 is 2.8V
Yes
Check WDDIS line:
X201 pin 11 -> R413 end towards N100
and
R413 other end -> X400 pin 7
Line OK?
Faulty PCB
See section "Phone is
totally dead".
No
NoYes
Master RESET PURX (R129)
is "1" (2.8V) after ca. 60ms
Check sleep clock
(C150 end towards D300 or
probe test point J301)
32kHz square wave
Check sleep clock circuit.
R117, R118, R126, C103,
C104, C150 and B100
No
No
Faulty N100 or overloaded
PURX line
Yes
13MHz clock
R835 (end away from
D350) 500mVpp min.
Yes
B
Yes
13MHz clock C300
(end away from D350)
800mV min.
Check C760, R706, R707,
V702, R717, C722, L701,
G701
Check R835, C820
No Yes
No
A
C