Nokia Mobile Phones NSE-5 Series Service Manual page 231

PAMS
Technical Documentation
2. Flash programming doesn't work
The flash programming can be done via panel connector X201 or via
system connector X200.
In production, the first programming is done via panel connector X201.
After this, the panel connector is cut away, thus other flash programming
must be done via system connector X200.
The main differences between these are:
a) FLASH programming voltage is produced different way.
b) Signal routings are different.
The fault finding diagrams for flash programming are shown in the next
three figures
In flash programming error cases the flash prommer can give some
information about a fault.
The fault information messages could be:
– MCU doesn't boot
– Serial clock line failure
– Serial data line failure
– External RAM fault
– Algorithm file or alias ID don't find
– MCU flash Vpp error
Issue 1 07/99
NSE–5
Troubleshooting
Page 5