Transceiver Troubleshooting; Troubleshooting Steps; General Instructions - Nokia NHM-8NX Series Troubleshooting Instructions

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NHM-8NX
Troubleshooting Instructions

Transceiver Troubleshooting

Troubleshooting steps

The following hints should help to find the cause of the problem when the circuitry
seems to be faulty. This trouble shooting instruction is divided into sections.
1 Phone is totally dead
2 Power does not stay on or the phone is jammed
3 Flash programming does not work
4 Display is not working
5 Plug in SIM card is out of order (insert SIM card).
6 Audio fault
7 Charging fault
The first thing to do is carry out a through visual check of the module. Ensure in particu-
lar that:
a) there are no mechanical damages
b) soldered joints are OK.

General instructions

Most semiconductors are static discharge sensitive! ESD protection must be taken care
of during repair (ground straps and ESD soldering irons). Mjoelner, PA, UEM, UPP, and
Flash are moisture sensitive and must be pre-baked prior to soldering, if they have been
out of their vacuum package longer than the specified time.
• Connect test jig (MJS-37) to computer with DAU-9S cable or to FPS-8 Flash
Prommer with AXS-4 serial cable.
• Make sure that you have PKD-1 dongle connected to computer's parallel port.
• Connect DC power supply to module test jig (MJS-37) with FLC-2 cable.
• Set the MJS-37 supply voltage to 8-12V
the MJS-37 jig may be damaged.
Note: By default the MJS-37 supplies the phone with 4.1V
needed, it is possible to modify MJS-37 to support this by removing R110 and mount S104.
See MJS-37 schematic for more info.
• When doing BB energy management (EM) calibrations use JBV-1 jig and DC sup-
ply voltage 12 – 15 V.
• JBV-1's current consumption is ~ 40 mA with 3.9 V supply voltage and ~ 80
mA with 15 V supply voltage.
• Set the phone module to test jig (MJS-37) and start Phoenix service software.
Initialize connection to phone (use FBUS driver when using DAU-9S and COM-
BOX driver when using FPS-8).
Page 4
DC
ãNokia Corporation
PAMS Technical Documentation
. If the input-voltage exceeds 12V
. If other output voltages is
DC
,
DC
Issue 1 05/02

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