Phone Is Totally Dead; Flash Programming Doesn't Work - Nokia NSB-1 Series Troubleshooting Instructions

NSB–1/3
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 (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
Check VBATT at CCONT
(N100 pins 8,12,...) =3.6V
Voltage at pin 29 of CCONT (N100)
is 3.6 V
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
See section: Power Doesn't Stay On

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
Page 4
YES
Failure in VBAT line
NO
Check X101, X102
YES
NO
Faulty circuit N100
YES
CCONT (N100) pin 29 0V when
NO
PWR switch is pressed or
watchdog disable is grounded
YES
Technical Documentation
NO
YES
Faulty circuit N100
PAMS
Check X99,R103
Check UI module
Original 06/98