User Guide

PAMS
Technical Documentation
NME–3
Troubleshooting
Page 3
Issue 1 10/99
Introduction
This document gives a comprehensive guide to NME–3 faultfinding.
NOTE
: The first thing to do is carry out a through visual check of the mod-
ules and ensure that:
a) There is no mechanical damages at the units
b) Soldered joints are o.k.
c) check which unit is broken HS or Radiounit
NOTE
: Make sure that the system is installed as specifided in the AS doc-
umentations. (Power supply connected to the unit, IGNS high, Handset
conneced,...)
The following hints should make it easier to find the cause of the problem
when the product seems to be faulty. This trouble shooting instruction is
divided into the following sections:
1. Which Unit is broken
2. RU failures
3. HS failures
Which Unit is broken
To check which unit is broken, the following steps should be performed:
Have a look at the failure describtion, if it doesn’t already indicate which
unit is broken, follow the procedure descibed below:
if there is a handset audio problem, connect the HS to a reference Radio-
unit and check if the problem is still there.
if the the system is not working at all then follow the steps described be-
low:
– Connect the HS to 8V
– check if the current consumption is O.K.
– check if the Nokia Hands are shown
– If both things are O.K. connect the HS to a reference Radiounit and check if it
works without problems
– In this case it is most likely a Radiounit problem, in all other cases it is most likely
a Handset problem
– Important NOTE: After repair of one unit it allways have to be checked that the
combination of both units is working !!!