Nokia Mobile Phones NSE-5 Series, Service Manual, Page: 232 / 327

PAMS
Technical Documentation
NSE–5
Troubleshooting
Page 6
Issue 1 07/99
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 edge) to
GND.
C308 end towards RTC–battery
(Vbb) is 2.8V
C112 end towards bottom (VXO)
is 2.8V
Yes
Check WDDIS line:
X201 pin 11 –> R413 end towards edge
and
R413 other end –> X400 pin 7
Line OK?
Faulty PCB
See section ”Phone is
totally dead”.
No
No Yes
Master RESET (PURX
R147 towards board)) is ”1”
(2.8V) after ca. 60ms
Check sleep clock
(C150 end towards MAD)
32kHz square wave
Check sleep clock circuit.
R117, R118, R121, R135,
C103, C104, C149, B100
and C150
No
No
Faulty N100 or
overloaded PURX line
Yes
13MHz clock
D700 pin 4
500mVpp min.
Yes
B
Yes
RFC 13MHz
800mV min.
V702 collector
Check R727, V702,
R728, R714, G701
Check D700
No Yes
No
A
C
Figure 2.