PAMS
Technical Documentation
NSB–1/3
Troubleshooting Instructions
Page 4
Original 06/98
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 (X001 pin 11) 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
YES
Voltage at pin 29 of CCONT (N100)
is 3.6 V
NO
Faulty circuit N100
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
NO
CCONT (N100) pin 29 0V when
PWR switch is pressed or
watchdog disable is grounded
YES
See section: Power Doesn’t Stay On
YES
Faulty circuit N100
NO
Check X99,R103
Check UI module
NO
Failure in VBAT line
Check X101, X102
Check VBATT at CCONT
(N100 pins 8,12,...) =3.6V
Flash programming doesn’t work
There are two possibilities to route programming voltage VPP.
– If regulator N200 is used the programming voltage comes from the reg-
ulator (VPPSW) via UI–connector to flash memory D210.
– Other way is to route Vpp from CCONT pin36 to UI–connector and
again to flash memory.
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
