Nokia 3110 Disassembly Troubleshooting
Programmes After Market Services
NHE–8/9 Series Transceivers
Disassembly &
Troubleshooting
issue 3 12/98
NHE–8/9
PAMS
Disassembly & Troubleshooting
Technical Documentation
CONTENTS
Disassembly 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
System Module Troubleshooting 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Phone is totally dead 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Flash programming doesn‘t work 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power doesn‘t stay on or the phone is jammed 9. . . . . . . . . . . . . . . . . . . .
Display information: Contact service 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Phone doesn‘t register (no serv) or doesn‘t make a call 12. . . . . . . . . . . .
SIM Card is out of order (insert SIM card or card rejected) 14. . . . . . . . . .
Audio fault 17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Charging fault 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
UIF Module troubleshooting 20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
UIF– connector 20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
LCD 20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Microphone 20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Earpiece 20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Buzzer 20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Keyboard and display LEDs 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Page 2
issue 3 12/98
PAMS
NHE–8/9
Technical Documentation
Disassembly
Remove battery
1
Disassembly & Troubleshooting
Remove 6 screws from the
2
chassis. Use the numbered
order.
2
1
3
4
5
4
Remove 3 screws from the shield
3
Remove the B cover beginning
from the bottom of the phone. Be
careful not to damage the board
to board connector!
5
Remove the shield
6
6
Re–assemble the phone in
reverse order. Note! Use the
numbered order when assembling the 6 screws and
tighten them to a torque of
0.15 Nm.
issue 3 12/98
1
5
3
6
2
4
Page 3
NHE–8/9
PAMS
Disassembly & Troubleshooting
Troubleshooting
General
The purpose is to define the faulty module block, and then to locate the
faulty 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 charts 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 sub–branch.
Required servicing equipment:
– PC for Service Software
– Power supply (2.0 A)
– Digital multimeter
Technical Documentation
– Oscilloscope
– Spectrum analyzer
– Signal generator
– RF cables
– Modular cable
– RS232/MBUS adapter
– HP8922H or equivalent
– RF measuring chassis
System Module Troubleshooting
The following hints should facilitate finding the cause of the problem when
the circuitry seems to be faulty. This trouble shooting 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.
Page 4
The first thing to do is carry out a thorough visual check of the module.
Ensure in particular that:
a) there is not any mechanical damage
b) soldered joints are OK
issue 3 12/98
PAMS
NHE–8/9
Technical Documentation
Phone is totally dead
Trouble shooting diagram for this fault is represented in figure below
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 (X100)
and the PSCLD (N300).
If the phone is totally dead,
check that
Voltage level at
PSCLD (N300)
pin 25 is same
as VBA T
Connect pins 18, 22
and 31 together (X101)
and measure that voltage level at pin 25
(N300)drop to zero.
YES
NO
Disassembly & Troubleshooting
PSCLD N300
pins 5,21,37 voltage level is
same as VBAT
NO
Check coils L311 +
L301 and the sol–
dered joints of the
connector X100
Rise up PSCLD
pin 25.
YES
If the DC voltage
is still missing
change N300
NO
Check soldered joints
of X100 and PCB
wires between X100
and N300
The voltage level at
pin 25 (N300) is zero
PSCLD (N300) switches
power on so the regulated
voltages VL, VA and VSL are
3.16V
Check that capacitors C329,
C330, C310 and C311 are
soldered. Check also soldered joints of N300. If these
things are correct, change
N300
YES
YESNO
Check the UI board and
the PWR button.
issue 3 12/98
Page 5
NHE–8/9
PAMS
Disassembly & Troubleshooting
Flash programming doesn‘t work
In error cases, the flash prommer can give some information about a
fault.
The fault information messages could be:
– MCU doesn‘t boot
– MCU flash Vpp error
– Serial data line failure
– Serial clock line failure
– External RAM fault
– Algorithm file or alias ID don‘t find
In cases that the the flash programming doesn‘t succeed, there is a
possibility to test the interface between the ASIC and the MCU.
This test is useful to do, when the fault information is: MCU doesn‘t boot
or Serial clock line failure.
Technical Documentation
The test procedure is following:
1. Connect a short circuit wire between Asic pins 137 and gnd.
2. Switch power on.
3. If the reset line of the MCU rises up, the interface is OK. Otherwise the
reset line stays low.
Note: this test can only find short circuits, not open pins.
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issue 3 12/98
PAMS
NHE–8/9
Technical Documentation
Output voltages of PSCLD (N300)
are 3.16 V ( VL, VA, VSL )
Master Reset (Purx), PSCLD pin 26
is ”1” ( 3.16 V )
Clock signal at the input of MCU (D150),
pin 51 is 6.5 MHz square wave.
Flash programming doesn‘t work
YES
YES
Master clock input, ASIC (D151)
pin 22 is 13 MHz, 1 Vpp, sine
wave with 1 V DC level
YES
Disassembly & Troubleshooting
NO
NO
NO
NO
Check the soldered joints of
N300. If OK, change N300
Rise up pin 26. If the logic
evel is still ”0”, check soldered joints of N300. If OK,
change N300.
Check components R150 and C153.
If they are OK, check the VCXO
block. One must remember that the
control signal for the VCXO is taken
from the baseband (see figure 6 )
Check resistor R152. Check the
soldered joints of ASIC. If OK,
change ASIC
YES
NO
MCU Reset input, pin 48 is ”1”
YES
Check that the following lines are correct.
1. Vpp line from J310 to FLASH (D400) pin 11
Normal fault information: MCU FLASH Vpp error
2. RXD line from J311 to MCU (D150) pin 2
Normal fault information: Serial data line failure
3. TXD line from J312 to MCU (D150) pin 1
Normal fault information: MCU doesn‘t boot
4. SCK line from J313 to MCU (D150) pin 3.
Check R315 also.
Normal fault information: Serial clock line failure
5. WDDIS line from J314 to PSCLD (N300) pin 22
6. GND , J315 is connected to ground
Rise up MCU pin 48. If the logic
level is still ”0”, check the soldered joints of the ASIC. If OK,
change ASIC.
issue 3 12/98
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