Nokia NSD-6 Installation instructions

Programmes After Market Services
NSD-6 Series Transceivers
Issue 1 04/01 Nokia Mobile Phones Ltd.
Disassembly/Troubleshooting
Instructions

NSD-6
Disassembly/Troubleshooting Instructions PAMS Technical Documentation
Page 2 Nokia Mobile Phones Ltd. Issue 1 04/01

PAMS Technical Documentation Disassembly/Troubleshooting Instructions
NSD-6
Issue 1 04/01 Nokia Mobile Phones Ltd. Page 3
Contents
Page No
Troubleshooting ............................................................................................................. 8
Baseband Troubleshooting............................................................................................. 8
Main Circuit Sections..................................................................................................... 8
Power Circuitry ............................................................................................................8
CCONT ........................................................................................................................8
Vbat ..............................................................................................................................8
Vref ..............................................................................................................................8
Linear Regulators .........................................................................................................9
1. Vbb........................................................................................................................ 9
2. RF Regulators (VR1–VR7)................................................................................... 9
3. V2V (VMAD) ....................................................................................................... 9
Switch mode regulator .................................................................................................9
1. V5V (+5V_POWER) ............................................................................................ 9
2. VSIM (3V_5V) ..................................................................................................... 9
A/D Conversion....................................................................................................... 10
Watchdog ................................................................................................................ 10
Serial bus................................................................................................................. 10
PENTA.................................................................................................................... 10
External regulators .....................................................................................................11
Clocks ........................................................................................................................11
Sleep Clock ............................................................................................................. 11
System Clock........................................................................................................... 11
CDMA clock ........................................................................................................... 11
Charging Circuit ........................................................................................................11
CAFE .........................................................................................................................12
Microphones ..............................................................................................................12
Earpiece and XEAR ...................................................................................................12
Clock circuit ...............................................................................................................12
AMPSMOD ...............................................................................................................12
Transmit and Receive RF Signals ..............................................................................12
MAD4 ........................................................................................................................13
DSP ............................................................................................................................13
External Regulator .....................................................................................................13
MCU ..........................................................................................................................13
Memories ...................................................................................................................14
Problems....................................................................................................................... 14
Phone won’t power up ...............................................................................................14
Flash Align .................................................................................................................14
Test 9....................................................................................................................... 14
Test 10..................................................................................................................... 14
In the field ..................................................................................................................14
Battery will not charge ...............................................................................................14
Audio failures ............................................................................................................15
List of Test Points ......................................................................................................16
Test Point Diagrams ..................................................................................................19
RF Troubleshooting ..................................................................................................... 20
WinTesla General Set Up ............................................................................................ 20

NSD-6
Disassembly/Troubleshooting Instructions PAMS Technical Documentation
Page 4 Nokia Mobile Phones Ltd. Issue 1 04/01
Testing Menu ............................................................................................................... 21
AMPS Fault Finding Setup ........................................................................................21
Cell Band CDMA Fault Finding Setup .....................................................................22
PCS Band CDMA Fault Finding Setup .....................................................................23
Tuning Menu .............................................................................................................23
AMPS Tuning AFC ...................................................................................................24
Description of Test.................................................................................................. 24
Definition of Result................................................................................................. 24
Manual Verification ................................................................................................ 24
Troubleshooting ...................................................................................................... 25
AMPS Tuning Tx Power Levels ................................................................................25
Description of Test.................................................................................................. 25
Definition of Result................................................................................................. 26
Manual Verification ................................................................................................ 26
Troubleshooting ...................................................................................................... 27
AMPS Tuning Tx Modulation Index .........................................................................28
Description of Test.................................................................................................. 28
Definition of Result................................................................................................. 28
Manual Verification ................................................................................................ 29
Troubleshooting ...................................................................................................... 29
AMPS Tuning RSSI ..................................................................................................29
Description of Test.................................................................................................. 29
Definition of Result ...................................................................................................29
Manual Verification ................................................................................................ 30
Troubleshooting ...................................................................................................... 30
AMPS Tuning Rx Audio Gain ..................................................................................32
Description of Test.................................................................................................. 32
Definition of Result................................................................................................. 32
Manual Verification ................................................................................................ 33
Troubleshooting ...................................................................................................... 33
800 CDMA Tuning Tx IF AGC ................................................................................33
Description of Test.................................................................................................. 33
Definition of Result................................................................................................. 33
Manual Verification ................................................................................................ 34
Troubleshooting ...................................................................................................... 34
800 CDMA Tuning LNA Switch ..............................................................................35
Description of Test.................................................................................................. 35
Definition of Result................................................................................................. 36
Manual Verification ................................................................................................ 36
Troubleshooting ...................................................................................................... 36
800 CDMA Tuning Rx IF AGC ................................................................................36
Description of Test.................................................................................................. 36
Definition of Result................................................................................................. 37
Manual Verification ................................................................................................ 37
Troubleshooting ...................................................................................................... 37
800 CDMA Tuning Rx IF Compensation .................................................................38
Description of Test.................................................................................................. 38
Definition of Result................................................................................................. 38

PAMS Technical Documentation Disassembly/Troubleshooting Instructions
NSD-6
Issue 1 04/01 Nokia Mobile Phones Ltd. Page 5
Manual Verification ................................................................................................ 38
Troubleshooting ...................................................................................................... 38
1900 CDMA Tuning Tx IF AGC ..............................................................................39
Description of Test.................................................................................................. 39
Definition of Result................................................................................................. 39
Manual Verification ................................................................................................ 39
Troubleshooting ...................................................................................................... 39
1900 CDMA Tuning LNA Switch ............................................................................40
Description of Test.................................................................................................. 40
Definition of Result................................................................................................. 40
Manual Verification ................................................................................................ 40
Troubleshooting ...................................................................................................... 41
1900 CDMA Tuning Rx IF AGC ..............................................................................41
Description of Test.................................................................................................. 41
Definition of Result................................................................................................. 41
Manual Verification ................................................................................................ 42
Troubleshooting ...................................................................................................... 42
1900 CDMA Tuning Rx IF Compensation ...............................................................42
Description of Test.................................................................................................. 42
Definition of Result................................................................................................. 42
Manual Verification ................................................................................................ 43
Troubleshooting ...................................................................................................... 43
Test Point Values ......................................................................................................... 44

NSD-6
Disassembly/Troubleshooting Instructions PAMS Technical Documentation
Page 6 Nokia Mobile Phones Ltd. Issue 1 04/01
NOTE! When assembling the B
cover screws, use 17 Ncm torque.
NOTE: Do not attempt to remove the antenna from the B–cover.
1.
2.
3.
4.
5.
Remove battery
Remove dust cap by fingernail
Remove back cover
screws (4 pcs) Remove C–cover
Carefully remove A–cover
Note snap fixings !
Press strongly towards
arrow direction
6.

PAMS Technical Documentation Disassembly/Troubleshooting Instructions
NSD-6
Issue 1 04/01 Nokia Mobile Phones Ltd. Page 7
Note: When the phone is disassembled (opened), please be careful NOT to TOUCH the
antenna clip (x703) or the antenna ground clip (x704). During re-assembly, ensure that
the clips are not damaged.
NOTE! When assem-
bling the screw use
17 Ncm torque.
7. 8.
Remove UI–module
screws (2 pcs) Remove UI–module
and frame
Remove engine
module screw (1 pc)
Remove microphone
Remove engine module
9.
10.
11.

NSD-6
Disassembly/Troubleshooting Instructions PAMS Technical Documentation
Page 8 Nokia Mobile Phones Ltd. Issue 1 04/01
Troubleshooting
Baseband Troubleshooting
Each main portion of the circuit will be described in enough detail for the troubleshooter
to determine whether or not that part of the circuit being evaluated is functional. It will
be helpful to use the placement diagram, which illustrates all of the necessary testpoints
in the baseband circuit, to troubleshoot the phone. The placement diagram is intended to
be used concurrently with this document. Herein, TPD refers to Test Point Designation.
TP refers to Test Point originating from schematics. Note that the baseband consists of
mainly a few ASICS, and there is very little discrete circuitry other than passive compo-
nents. Baseband problems are few compared to previous projects with much more dis-
crete circuitry.
Therefore, hardware bugs will not be as obvious since they will likely NOT be a failing
part, but perhaps SMD or mechanical issues.
Main Circuit Sections
Power Circuitry
There are two ASICs in the baseband section, which supply power to most of the phone.
CCONT is the main power management ASIC, and PENTA is used to supply additional
switchable regulators for use in RF. Two discrete linear regulators are used as well.
CCONT
CCONT is the main power management ASIC. Its features include eight 2.8V linear regu-
lators, a linear regulator with adjustable output, a reference voltage output, a 5V switch
mode regulator, an 8 channel A/D converter, and 32kHz clock circuitry. Each of the main
functions and signals is described below, including information on how to verify correct
operation.
Vbat
CCONT is powered directly from the battery voltage, Vbat. Since CCONT is a uBGA, the
physical connection of CCONTs power pins cannot be verified. Vbat must be checked
instead at the closest external component, which is shown as TPD30. Valid voltages are
3.1 – 4.1V and should always be powered, assuming voltage is applied to the battery ter-
minals.
Vref
Vref is used as a reference voltage both internal and external to CCONT. It is switchable
between the nominal voltages of 1.500V and 1.251V, with the default at power up being
1.500V. The phone uses the 1.251V reference, so once flash software is running Vref
must switch to 1.251V.
Check Vref at TPD6. Valid voltages are 1.478 – 1.523V and 1.244 – 1.258V, respectively.

PAMS Technical Documentation Disassembly/Troubleshooting Instructions
NSD-6
Issue 1 04/01 Nokia Mobile Phones Ltd. Page 9
Linear Regulators
1. Vbb
Vbb supplies power to most of the baseband circuitry. This regulator should be on at all
times during CCONTs power on, reset, and sleep modes. Nominal voltage is 2.8V, but
anything in the range 2.7–2.87V is valid. Vbb is found at TPD3.
2. RF Regulators (VR1–VR7)
VR1 through VR7 are referred to as the RF regulators. Most are switchable, and all should
be within 2.67 – 2.85V when they are on (2.8V nomi nal). VR1 and VR6 are always on
during CCONTs power on mode. The rest of the regulators are switchable and are nor-
mally on during one or more of the various phone states, but may be turned on at any
time with the service software in order to verify their output. The RF regulators can be
checked at the following test points.
a) VR1 – TPD11
b) VR1_SW – TPD12
c) VR2 – TPD40
d) VR3 – TPD38
e) VR4 – TPD4
f) VR5 – TPD39
g) VR6 – TPD10
h) VR7 – TPD41
i) VR7A –TPD9
3. V2V (VMAD)
The V2V regulator is intended to power the MAD4 ASIC core. The output is adjustable
from 1.3V to 2.65V in 0.225V steps, and is used with MAD4 ver 3 (but not MAD4 ver 2).
The output at V2V, when MAD4 ver 3 is mounted, should be 1.750V ±5% and can be
checked on TPD2.
Switch mode regulator
1. V5V (+5V_POWER)
V5V is a 5V switch mode regulator, which always remains on during CCONT power on
mode. Valid voltages are 4.8V to 5.2V, and it can be checked at TPD16.
2. VSIM (3V_5V)
VSIM is powered by the same switch mode regulator as V5V, however, it is switchable

NSD-6
Disassembly/Troubleshooting Instructions PAMS Technical Documentation
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between 3V and 5V. The phone uses VSIM as the 3V FLASH programming voltage, so it
should remain off unless the phone is being flashed. Valid voltages are 2.8V to 3.2V, and
it can be checked at TPD7 (or TP33 on PWB).
A/D Conversion
CCONT contains a 10–bit A/D converter that is multiplexed between 8 different inputs.
They are used mainly for battery and charger monitoring. The 8 inputs are Vbat (battery
voltage), ICHAR (charger current), VCHAR (charger voltage), BSI (battery type), BTEMP
(battery temperature), VCXOTEMP (PA temperature), RSSI (AMPS receive signal strength),
and EAD (accessory detection). These readings can be accessed through the service soft-
ware. Check for shorts or opens on the resistor networks connected to these signals if the
flash align test software reports that they are out of range.
Watchdog
CCONTs watchdog circuitry consists of an eight bit down counter that causes CCONT to
power down when zero is reached. The counter may be reset by loading a new, non–zero
value into the watchdog register via CCONTs serial bus. It is difficult to verify the watch-
dog function, but the serial bus may be verified.
There is a watchdog disable pin which allows the watchdog timer to expire without
shutting down the phone, but this pin is mainly used as one of the methods to turn on
CCONT from power off mode. While the phone power key is pressed, this pin should be
pulled low and can be checked at TPD 35 (R325).
The watchdog can be disabled by pulling down the above mentioned pin(WDDISX) by
installing a 0 Ohm resistor at R307, and removing R325.
Serial bus
Since the serial bus is used to control almost all of CCONTs functions, any shorts or open
circuits on these three lines would cause CCONT to be completely nonfunctional. The
main symptoms are the following:
CCONT will turn on when the power key is pressed (verify this by checking Vbb), but will
then power off after 32 seconds. All three serial bus sig nals (CCONTCSX,
UIF_CCONT_SDIO, and UIF_CCONT_SCLK) should toggle when attempting to write to a
CCONT register.
Note: If the LCD does not come on during this time, however, it may indicate that the
serial bus is functional, but phone does not have valid flash code.
PENTA
PENTA supplies power to the RF section. It has 5 independently switchable regulators
that are controlled via separate enable pins. There is also a common enable pin that must
be active in order to turn on any of the regulators. Each of the regulators, P1–P5, should
have output voltages between 2.7V and 2.85V (2.8V nominal). These can be checked at
the following test points.
a) P1 – TPD18