Nokia 8260 Service Manual 06troub
PAMS Technical Documentation
NSW-4 Series Transceivers
Disassembly &
Troubleshooting
Issue 1 Final
Draft 08/00
Nokia Mobile Phones Ltd.
NSW-4
Disassembly & Troubleshooting
AMENDMENT RECORD SHEET
PAMS Technical Documentation
Amendment
Number
Date Inserted By Comments
08/00 OJuntune Issue 1
Page 2
Nokia Mobile Phones Ltd.
Issue 1 Final
Draft 08/00
PAMS Technical Documentation
Disassembly & Troubleshooting
CONTENTS
Disassembly 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Baseband Testing 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Alignments 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Trouble Shooting 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Phone is totally dead 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Flash programming doesn’t work 13. . . . . . . . . . . . . . . . . . . . . . .
Power doesn’t stay on or the Phone is jammed 14. . . . . . . . . . .
The phone doesn’t register to the network 15. . . . . . . . . . . . . . .
Charging failure 17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RF Troubleshooting 18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Introduction 18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Abbreviations used 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Interface signals between RF and BB/DSP 20. . . . . . . . . . . . . . .
Receiver 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General instructions for RX troubleshooting 24. . . . . . . . . . . . . .
Path of the received signal 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
AMPS RX 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TDMA800RX 26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TDMA 1900RX 29. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
NSW-4
Page No
Transmitter 31. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General Instructions for TX Troubleshooting 31. . . . . . . . . . .
Path of the transmitted signal 33. . . . . . . . . . . . . . . . . . . . . . . .
Troubleshooting diagrams for TX 34. . . . . . . . . . . . . . . . . . . . . . .
AMPS TX 34. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TDMA800 TX 36. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TDMA1900 TX 37. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power control loop 39. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Synthesizers 40. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
19.44 MHz Reference oscillator 40. . . . . . . . . . . . . . . . . . . . . .
58.32 MHz Triple Multiplier 40. . . . . . . . . . . . . . . . . . . . . . . . . .
19.44 MHz oscillator 41. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
VHF VCO 43. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
AMPS& TDMA800 UHF SYNTHESIZER 44. . . . . . . . . . . . . .
TDMA1900 UHF SYNTHESIZER 45. . . . . . . . . . . . . . . . . . . . .
RF ASIC DATA 46. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General Info 46. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
EROTUS ASIC 46. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
RX Front ends N701 and N721 46. . . . . . . . . . . . . . . . . . . . . .
Power Amplifiers N903 & N960 47. . . . . . . . . . . . . . . . . . . . . .
PENTA regulator N702 48. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Issue 1 Final Draft
08/00
Nokia Mobile Phones Ltd.
Page 3
NSW-4
Disassembly & Troubleshooting
TDMA1900 UPCONVERTER N980 48. . . . . . . . . . . . . . . . . . .
TDMA1900 PLL–circuit N870 49. . . . . . . . . . . . . . . . . . . . . . . .
Warranty transfer 50. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PAMS Technical Documentation
Page 4
Nokia Mobile Phones Ltd.
Issue 1 Final
Draft 08/00
PAMS Technical Documentation
Disassembly
NSW-4
Disassembly & Troubleshooting
1. Remove battery
2. Remove the antenna cover by using the ART–9 antenna removal tool.
Place the ART–9 flat side down in the battery recess of the phone in the
top left hand corner. The extruding ”finger” slides in the hole next to the
battery springs and when pushing the tool the antenna is released for removal
Issue 1 Final Draft
08/00
Nokia Mobile Phones Ltd.
Page 5
NSW-4
Disassembly & Troubleshooting
PAMS Technical Documentation
3. Remove screws from the back of the phone.
4. Open covers.
Page 6
Nokia Mobile Phones Ltd.
Issue 1 Final
Draft 08/00
PAMS Technical Documentation
NSW-4
Disassembly & Troubleshooting
5. Remove shield screws (2 pcs)
6. Remove shield.
Issue 1 Final Draft
08/00
Nokia Mobile Phones Ltd.
Page 7
NSW-4
Disassembly & Troubleshooting
7. Remove main PWB
PAMS Technical Documentation
Page 8
8. Remove keyboard spacer.
Nokia Mobile Phones Ltd.
Issue 1 Final
Draft 08/00
PAMS Technical Documentation
NSW-4
Disassembly & Troubleshooting
9. Remove UI board
10. Separate parts from cover.
Issue 1 Final Draft
08/00
Nokia Mobile Phones Ltd.
Page 9
NSW-4
Disassembly & Troubleshooting
Baseband Testing
The MCU software enters a local mode at start-up if suitable resistors are
connected to the BTEMP and BSI lines.
NOTE! Baseband doesn’t wake up automatically when the battery voltage
is connected. Power must be switched on via:
1. Pwr key or
2. BTEMP line or
3. Charger
4. Connecting J150 to ground
Alignments
PAMS Technical Documentation
Within alignment those parameters are adjusted, that cannot be set accurate enough by design, because of component tolerances.
Due to use of 5% resistor values, the channels of the CCONT A/D converters need to be aligned in the production phase.
Within battery voltage tuning VBAT the MCU software reads the A/D reading from CCONT at 4.1 V and stores this reading to EEPROM (emulated
by Flash) memory as a reference point. Then second reading is done at
3.1 V. Now the slope is known and A/D readings can be calibrated. Calibration is included in VBAT A/D reading task.
Battery charging voltage VCHAR and current ICHAR are calibrated using
one test setting. Test jig in production line must have a connection to battery terminals. ICHAR is adjusted to 500 mA and VCHAR to 8.4 V with
appropriate load connected to the battery terminals.
Page 10
Nokia Mobile Phones Ltd.
Issue 1 Final
Draft 08/00
PAMS Technical Documentation
Trouble Shooting
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 does not work
3. Power does not stay on or the phone is jammed
4. Display information: Contact Service
5. Phone does not register to the network or phone does not make a call.
6. Audio fault.
7. Charging fault
The first thing to do is carry out a through visual check of the module. En-
sure in particular that:
a) there are not any mechanical damages
b) soldered joints are OK
NSW-4
Disassembly & Troubleshooting
Issue 1 Final Draft
08/00
Nokia Mobile Phones Ltd.
Page 11
NSW-4
Disassembly & Troubleshooting
Phone is totally dead
This means that phone doesn’t take current at all when the power switch
is pressed or when the watchdog disable pin (X101 pin 11 or J150) is
grounded. Used battery voltage must be higher than 3.0 V. Otherwise the
hardware of CCONT (N150) prevents totally switching power on. Here the
VBat is set to 3.6V
Phone is
totally dead
YES
NO
VBat=3.6V at R153
YES
PAMS Technical Documentation
Failure in VBat line,
check X100
Voltage at J150 of CCONT
(N150) = 3.6V
YES
C166 (VBB) = 2.8V
C158 (VR1) = 2.8V
when PWR switch pressed or
watchdog disable pin
grounded
YES
See section: Power does not
stay on
NO
Faulty circuit N150
NO
CCONT(N150) J150 = 0V
when PWR switch pressed
or watchdog disable pin
(X101 pin 11) grounded
YES
Faulty circuit N160
NO
Check R160, PWR switch,
connector X300
Check watchdog disable
line X101
Page 12
Nokia Mobile Phones Ltd.
Issue 1 Final
Draft 08/00
PAMS Technical Documentation
Flash programming doesn’t work
The flash programming is carried out via the pads accessible from the
back of the phone (using service accessories).
Flash programming doesn’t work
YES
NSW-4
Disassembly & Troubleshooting
VBAT > 3.0 V
VBB (C166) 2.8 V
VR1 (C158) 2.8 V
YES
PURX (J140) master reset=”1”(2.8V)
FLASH (D201) VBB is 2.8V (C203),
SRAM (D200) VBB is 2.8 V (C200),
FLASH VPP is > 2.8 V (C202)
YES
RFC (J250) 19.44 MHz sine wave
Clock signal: 700mV Vpp typ.
COBBACLK (J210) 9.72MHz sq.wave
clock signal 2.80 Vpp
OK
Check the following lines:
FBUSTXD line: J114–>MAD1
FBUSRXD line: J113–>MAD1
M2BUS line: J112 to MAD1
NO
Check also pullup and pulldown
resistors
R209, R210, R212
OK
See section ”Phone is totally dead”
NO
Sleep clock SLCLK (J157)
square wave 32 kHZ
Faulty circuit N150
or over loaded PurX line
NO
YESYES
check
VCXO G850
NO
Check sleepclock circuitry
C154, C155, C190
Check control lines of SRAM and FLASH:
e.g. there is voltage spikes when trying to write
and read something to SRAM and FLASH
RAMSelX (J207), RPMSelX (J208)
MCURDX and MCUWRX (X200 pins 19 and 18)
There could be open pins in circuits D200, D201, D202
(open joints may be detectable with microscope).
If not the PCB or D202, D200, D201, N150 is faulty
Issue 1 Final Draft
08/00
OK
Nokia Mobile Phones Ltd.
Page 13
NSW-4
Disassembly & Troubleshooting
PAMS Technical Documentation
Power doesn’t stay on or the Phone is jammed
If this kind of fault has come after flash programming, there are most
probably open pins in ICs. The solder joints of ICs: MAD1 (D202), Flash
(D201) and SRAM (D200) are to be checked at the extent possible (by
microscope from the side of PCB and lightly pressing components while
switching power on).
Normally the power will be switched off by CCONT (N150) after 32 seconds, if the watch-dog of the CCONT can not be served by software. The
watch-dog updating can be seen by oscilloscope at J154 (DataselX) of
CCONT. In normal case there is a short pulse from ”1” –> 0 every 8 seconds. The power off function of CCONT can be prevented by connecting
a short circuit wire from WDDISX (CCONT E4 (J150)) to ground (J151).
Power doesn’t stay on or phone is jammed
YES
CCONT (N150) watchdog is served?
J154 pulses 1 –> 0)
Connect short circuit wire from
Watchdog J150 to ground J151
OK
FLASH (D201) VBB is 2.8V (C203)
YES
PURX (J152) master reset = ”1” (2.8 V)
YES
RFC (J255) 19.44 MHz sine wave
Clock signal: 700 mV Vpp typ.
COBBACLK (J210) 9.72 MHz square wave
clock signal 2.80 Vpp
YES
YES
NO
NO
NO
Software is able to run
If power is switched off
after few seconds, check
BSI (X100 to C167) and
BTEMP (X100 to C168)
lines
YES
VBAT is OK =
3.8V
Sleep clock SLCLK
square wave 32 kHz
YES
Faulty circuit N150
or over loaded PURX line
Check VCXO G850
N150 is faulty
NO
check sleep
clock circuitry
(B150, R157...)
Page 14
Open pins or faulty circuit:
D202, D200, D201, N150
Nokia Mobile Phones Ltd.
Issue 1 Final
Draft 08/00
PAMS Technical Documentation
Disassembly & Troubleshooting
The phone doesn’t register to the network or phone
doesn’t make a call
If the phone doesn’t register to the network or the phone doesn’t make a
call, the reason could be either the baseband or the RF part. The phone
can be set to wanted mode by WinTesla service software and determinate
if the fault is in RF or in baseband part (RF interface measurements).
The control lines for RF part are supplied both the System Asic (MAD
D202) and the RFI (Cobba N250). MAD handles digital control lines and
Cobba handles analog control lines.
Diagram is on the next page.
NSW-4
Issue 1 Final Draft
08/00
Nokia Mobile Phones Ltd.
Page 15
Loading...