Troubleshooting; Phone Is Totally Dead - Nokia NSB-5 Series Troubleshooting Instructions

PAMS Technical Documentation

Troubleshooting

The following hints should facilitate finding the cause of the problem when the circuitry
seems to be faulty. This troubleshooting instruction guide is divided into the following
sections:

1 Phone is totally dead

2 Flash programming doesn't work
3 Power doesn't stay on or the phone is jammed
4 Display information: Contact Service
5 Phone doesn't register to the network or phone doesn't make a call
6 Plug in SIM card is out of order (insert SIM card or card rejected)
7 Audio fault
8 Charging fault
The first step to do is to carry out a thorough visual check of the module. Ensure in par-
ticular that:
• there are not any mechanical damages, and
• solder joints are okay.
Phone is Totally Dead
This means that the phone doesn't take current at all when the power switch is pressed
(X400 pin 7) or when the watchdog disable pin is grounded. Used battery voltage must
be higher than 3.1V. Otherwise, the hardware of CCONT (N100) totally prevents power
from switching on.
Issue 1 03/01
Nokia Mobile Phones Ltd.
NSB-5
Troubleshooting Instructions
Page 5