PAMS
Technical Documentation
NSC/W–1/3
Disassembly & Troubleshooting Instructions
Page 12
Original 11/99
Phone is totally dead
YES
Check R164, X102
Tp5
VBAT is 3.6 V
NO
Failure in VBAT line
Check X105, X104, Z100
YES
Voltage at pin 29 of CCONT (N150)
is 3.6 V
NO
Faulty circuit N150
YES
N 150 pin 55 (VBB) 2.8 V(=TP14)
N150 pin 25 (VXO) 2.8 V/TP10)
when PWR switch is pressed
or watchdog disable pin is grounded
NO
CCONT (N150) pin 29 0V when
PWR switch is pressed or
watchdog disable pin is (X101)
grounded
YES
See section: Power Doesn’t Stay On
YES
Faulty circuit N150
NO
Check UI module
Check watchdog disable line to
X101
Flash programming doesn’t work
The flash programming can be done via panel connector X101 or via system
connector X100.
The main differences between these are:
a) FLASH programming voltage is produced different way.
b) Signal routings are different.
In flash programming error cases the flash prommer can give some informa-
tion 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 doesn’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 (MAD1).
This test is useful to do, when the fault information is: MCU doesn’t boot, Se-
rial clock line failure or Serial data line failure.
