Nokia NHE–5 Troubleshooting Instruction
After Sales Technical Documentation
NHE–5 TROUBLE–
SHOOTING
INSTRUCTIONS
Original 04/97
NMP Part No. 0275076
NHE–5 Troubleshooting Instructions
AMENDMENT RECORD SHEET
After Sales
Technical Documentation
Amendment
Number
Date Inserted By Comments
Page 2
Original 04/97
After Sales
Technical Documentation
NHE–5 Troubleshooting Instructions
NHE–5 TROUBLESHOOTING INSTRUCTIONS
Contents
Introduction Page 4
General Page 4
Baseband Troubleshooting Page 5
Phone is Totally Dead Page 6
Flash Programming Doesn‘t Work Page 7
Power Doesn‘t Stay On or The Phone is Jammed Page 10
The Function of the 32 kHz Clock Oscillator in Test Circumstances Page 10
Display Information: Contact Service Page 12
The Phone Doesn‘t Register to The Network (no serv) or Phone Doesn‘t Make
a Call Page 13
The States of The DSP after Power On Page 13
SIM Card is Out of Order (Insert SIM Card or Card Rejected) Page 15
Audio Fault Page 17
Original 04/97
Page 3
NHE–5 Troubleshooting Instructions
Introduction
General
The purpose is to define fault block of the module and then find out the broken
component. The trouble shooting diagram has been planned so that the fault,
whatever it is, can be found by as simple measurements as possible.
The flow diagrams give you the overview of the blocks. The purpose is that you
proceed through the flow diagram so that, if your answer is YES for the asked
question, go straight to the next level, but if your answer is NO, you have to go
the subbranch.
Required servicing equipment:
– PC for Service Software
– Power supply (2.0 A)
– Digital multimeter
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– Oscilloscope
– Spectrum analyzer
– Signal generator
– RF cables
– Modular cable
– RS232/MBUS adapter
– HP8922H or equal
– RF measuring chassis
The Troubleshooting for NHE–5 consist of a series of checks according to the
following flow diagrams.
Page 4
Original 04/97
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Technical Documentation
Baseband Troubleshooting
The following hints should facility finding the cause of the problem when the circuitry seems to be faulty. This troubleshooting instruction is divided following
section.
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.
The first thing to do is carry out a through visual check of the module. Ensure in
particular that:
a) there are not any mechanical damages
b) soldered joints are OK
NHE–5 Troubleshooting Instructions
Original 04/97
Page 5
NHE–5 Troubleshooting Instructions
Phone is Totally Dead
Troubleshooting diagram for this fault is represented in following figure. Check
at first that the battery back is OK and it is not empty. This kind of fault has
been limited around the system connector (X103) and the PSCLD (N301).
If the phone is totally dead,
check that
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NO
Check soldered joints
of X101 and PCB
wires between X101
and N301
Voltage level at
PSCLD (N301)
pin 25 is same
as VBA T
YES
Connect pins 19 and 20
together (X101) and
measure that voltage
level at pin 25 (N301)
drop to zero.
The voltage level at
pin 25 (N301) is zero
NO
PSCLD N301
pins 5,21,37...
voltage level is
same as VBAT
NO
Check coils L300,
L310 and the sol–
dered joints of the
connector X103
YES
PSCLD (N301) switches
power on so the regulated
voltages VL, VA and VSL are
3.16V
YES
Rise up PSCLD
pin 25.
If the DC voltage
is still missing
change N301
YESNO
Page 6
Check that capacitors C329,
C330, C310 and C311 are
soldered. Check also soldered joints of N301. If these
things are correct, change
N301
Check the UI board and
the PWR button.
Original 04/97
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