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NSE–1
Disassembly & Troubleshooting Instructions
Phone is totally dead
This means that phone doesn't take current at all when the power switch
is pressed or when the watchdog disable pin (N100 pin 29) is grounded.
Used battery voltage must be higher than 3.0 V. Otherwise the hardware
of CCONT (N100) prevents totally to switch power on.
Phone is totally dead
YES
J232
VBAT is 3.6 V
YES
Voltage at pin 29 of CCONT (N100)
is 3.6 V
YES
N100 pin 55 (VBB) 2.8 V
N100 pin 25 (VXO) 2.8 V
when PWR switch is pressed
or watchdog disable pin is grounded
YES
See section: Power Doesn't Stay On
Flash programming doesn't work
In service places flash programming can be done via system connector
X100.
In flash programming error cases the flash prommer can give some in-
formation 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
In cases that the flash programming doesn't succeed there is a possibility
to check short circuits between the memories and the MCU (MAD2).
This test is useful to do, when the fault information is: MCU doesn't boot,
Serial clock line failure or Serial data line failure.
Page 6
Failure in VBAT line
NO
Check X101, X102, L103
NO
Faulty circuit N100
CCONT (N100) pin 29 0V
NO
when PWR switch is pressed
Faulty circuit N100
Technical Documentation
NO
Check R118, X300
Check UI module
YES
PAMS
Original 03/98
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