Measurement Points; Troubleshooting Steps - Nokia NHM-7 series Service Manual

NHM–7
Troubleshooting Instructions

Measurement Points

VOUT
VDD 2.78 V
VDDI 1.8 V
SCLK
SDA
GND
XCS
XRES

Troubleshooting steps

The following hints help to find the problem if the circuitry seems to be
faulty. The instructions are divided into 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. Charging fault
5. Plug in SIM card is out of order (insert SIM card).
6. Audio fault
7. Display is not working
8. Keypad fault
The first thing to do is carry out a through visual check of the module. En-
sure in particular that:
a) there are not any mechanical damages
b) soldered joints are OK
Page 4
VR5 2.78 V
VR7 2.78 V
VIO 1.8V VCORE 1.8V
E Nokia Corporation
PAMS Technical Documentation
VR3 2.78 V
VFLASH2 2.78 V
VR1B 4.75 V
VR1A 4.75 V
VR2 2.78 V
VR6 2.78 V
VR4 2.78 V
VANA 2.78 V VFLASH1 2.78 V
Issue 1 10/2001