PAMS Technical Documentation
TFF-3 WLL Terminal
Disassembly and
Troubleshooting
Instructions
Issue 1 08/99 Nokia Mobile Phones Ltd.
TFF-3
Disassembly and Troubleshooting Instructions
AMENDMENT RECORD SHEET
PAMS Technical Documentation
Amendment
Number
Date Inserted By Comments
08/99 OJuntune Original
Page 2
Nokia Mobile Phones Ltd.
Issue 1 08/99
PAMS Technical Documentation
Disassembly and Troubleshooting Instructions
CONTENTS
Disassembly 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Trouble Shooting 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Phone is totally dead 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Flash programming doesn’t work 8. . . . . . . . . . . . . . . . . . . . . . .
Flash Programming (1) 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Flash Programming failure (2) 10. . . . . . . . . . . . . . . . . . . . . . .
Power doesn’t stay on, or phone is jammed 11. . . . . . . . . . . . . .
Instructions for RX troubleshooting 12. . . . . . . . . . . . . . . . . . .
Audio failure 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TFF-3
Page No
Issue 1 08/99
Nokia Mobile Phones Ltd.
Page 3
TFF-3
Disassembly and Troubleshooting Instructions
Disassembly
1 )
PAMS Technical Documentation
2 )
–Remove b–cover screws ( 6 pcs )
Page 4
Nokia Mobile Phones Ltd.
–Remove a–cover
Issue 1 08/99
PAMS Technical Documentation
3 )
TFF-3
Disassembly and Troubleshooting Instructions
–Remove pcb–screws ( 5 pcs ) and
output stage screws ( 2 pcs )
4 )
Issue 1 08/99
Nokia Mobile Phones Ltd.
–Remove pcb
Page 5
TFF-3
Disassembly and Troubleshooting Instructions
Troubleshooting
The following hints should facility finding the cause of the problem when
the circuitry seems to be faulty. This trouble shooting 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. Audio fault.
The first thing to do is carry out a through visual check of the module. Ensure in particular that:
PAMS Technical Documentation
a) there are not any mechanical damages
b) soldered joints are OK
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Issue 1 08/99
PAMS Technical Documentation
Phone is totally dead
This means that phone doesn’t take current at all when the power cable is
connected.
Phone is totally dead
TFF-3
Disassembly and Troubleshooting Instructions
YES
Check VBAT at 5V regulator
(N101 pin 1) =13.5V
YES
Check VS at PSA
(N103 pins 3,11,...) =5.0V
YES
N103 pin 13 (VL) 2.8 V
N103 pin 17 (VA) 2.8 V
YES
See section: Power Doesn’t Stay On
NO
NO
NO
Failure in VBAT line
Check F101
Faulty circuit N101
Faulty circuit N103
Issue 1 08/99
Nokia Mobile Phones Ltd.
Page 7
TFF-3
Disassembly and Troubleshooting Instructions
Flash programming doesn’t work
The fault finding diagrams for flash programming via system connector
are shown in the next figures.
There is regulator N105 which is used to produce the programming voltage (VPROG) it’s controlled by MCU and the same control line disables
watchdog.
In flash programming error cases the flash prommer can give some information about a fault.
The fault information messages could be:
– MCU doesn’t boot
– Serial clock line failure
– Serial data line failure
– External RAM fault
– Algorithm file or alias ID don’t find
– MCU flash Vpp error
PAMS Technical Documentation
In cases that the flash programming doesn’t succeed there is a possibility
to check short circuits between the memories and the MCU.
This test is useful to do, when the fault information is: MCU doesn’t boot,
Serial clock line failure or Serial data line failure.
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Nokia Mobile Phones Ltd.
Issue 1 08/99
PAMS Technical Documentation
Flash Programming (1)
Flash programming doesn’t work
If the fault information from the prommer is:
a) MCU doesn’t boot
b) serial data line failure
c) serial clock line failure
TFF-3
Disassembly and Troubleshooting Instructions
YES
connect:
OK
Check MASI crystal
oscillator circuitry
PSA (N103) pin 13 (VL) =2.8V
PSA (N103) pin 17 (VA) =2.8V
YES
NO
Check that following lines are correct from X750 to D200
There could be open pins in circuits D200, D210, N700
MASI (N700) pin 62 14.74MHz
clock signal: 2Vpp min.
YES
MBUS: X750 pin 3 ––> D200 pin 91
FBUS_TX: X750 pin 2 –> D200 pin 89
FBUS_RX: X750 pin 1 –> D200 pin 90
check also pullup and pulldown resistors
GND : X750 pin 4,5 –> GND
OK
If not, the PCB or D200, D210, N700 are faulty.
NO
See section: Phone is totally dead
Issue 1 08/99
Nokia Mobile Phones Ltd.
Page 9
TFF-3
Disassembly and Troubleshooting Instructions
Flash Programming failure (2)
Flash programming doesn’t work
YES
If the fault information from the prommer is:
External RAM fault
YES
PAMS Technical Documentation
Check pins of SRAM (D220)
Check control lines of SRAM:
CS1,_WE,__OE...
Flash programming doesn’t work
YES
If the fault information from the prommer is:
MCU flash Vpp error
YES
D210 pin13 (C210)
Vpp=3.0V
YES
Faulty component
D210
NO NO
Check output of regulator
N105 pin 1 Vpp=3.3 V
YES
Check PCB
Flash programming doesn’t work
YES
If the fault information from the prommer is:
Algorithm file or alias ID don’t find, ID is unknown etc.
YES
Check pins of FLASH (D210)
Check control lines and data/address lines
of FLASH: _CP,_OE_WE...
NO
Check control
line (pin 3) of
N105.
Faulty component
N105
YES
Faulty
component
D200
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Nokia Mobile Phones Ltd.
Issue 1 08/99
PAMS Technical Documentation
Disassembly and Troubleshooting Instructions
Power doesn’t stay on, or phone is jammed
If this kind of fault has come after flash programming, there are most
probably open pins in ICs.
The soldered joints of ICs: D200 (MCU), D210 (FLASH), N103 (PSA),
D220 (SRAM) are useful to check at first.
Normally the power will be switched off by PSA (N103) after 10 seconds,
if the watchdog of the PSA cannot be served by software.
The watchdog updating can be seen by oscilloscope at pin 23 (POWEROFFX) of PSA.
In normal case there is a short pulse from ”1” –> 0 every 8 seconds.
The power off function of PSA can be prevented by connecting a short
circuit wire from PSA pin 24 to ground.
TFF-3
Check crystal
oscillator circuitry
Power doesn’t stay on or phone is jammed
YES
PSA watchdog is served?
(pin 23 pulses 1 –> 0)
NO
Connect watchdog disable line to GND (R210)
OK
PSA (N103) pin 13 (VL) 2.8V
PSA (N103) pin 17 (VA) 2.8V
YES
N103 (PURX) = 2.8V
YES
NO
MASI (700) pin 62 14.74MHz
clock signal: 2Vpp min.
YES Software is able to run,
check UI module.
NO
NO
VS is correct
5.0V
YES
N103 is faulty
Faulty circuit N103
or over loaded PurX line
NO
F101 or N101
is faulty
Issue 1 08/99
YES
Open pins or faulty circuit:
D200, D210, D220, N103
Nokia Mobile Phones Ltd.
Page 11
TFF-3
Disassembly and Troubleshooting Instructions
Instructions for RX troubleshooting
Audio failure
MICROPHONE LEVEL / MODULATION LEVEL FAULT
TXBPO COMI
PAMS Technical Documentation
MIC
EXTMIC
IF
PIN 45
SCR
245mVrms
DESCR
COMPR
RXAGC
PREEM AGC LIM
TXTRI+TXPOST
HF CONTROL
EARSFIL VOL
RXATT
TXLP
WTRFIL+WPOSFIL
SUM
EARPOST
VarFilter
EARAMP
MICAM
Signal levels are measured by oscilloscope and input signal frequency is 1 kHz, deviation 3kHz and generator voltage level 260mV.
RXTRI
TXMUX1
EXTMIC
EARPHONE LEVEL / MODULATION LEVEL FAULT
RXAAF EXPCOMP
MICTRI
PIN 43 PIN 44
RXMUX+AAFIL
TXMUX2
258mVrms 248mVrms
DEEMP
TXAAF
TXBPO
COMI
TXATT
PIN 46
MOD
304mVrms
EARP
EARN
EXTEAR
EXPO
FILO EXPI
FILO
EXPI
EXPO
VOLI
Signal levels are measured by oscilloscope and received signal audio frequency is 1 kHz, deviation 3kHz and power level –53dBm.
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PIN 27
PIN 28
PIN 29
PIN 30
VOLI
140mVrms
140mVrms
168mVrms
100mVrms
EARP
EXTEARPIN 26IF 124rVrms
PIN 33
43mVrms
PIN 35
43mVrms
Issue 1 08/99
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