Nokia NHL-10 User manual

ISSUE 2 01/2004 COMPANY CONFIDENTIAL 1
Copyright © 2003 Nokia. All Rights Reserved.
Customer Care Solutions
Technical Documentation
6(a) - Baseband Troubleshooting
and Manual Tuning Guide

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CCS Technical Documentation Baseband Troubleshooting
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Baseband Troubleshooting CCS Technical Documentation
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Table of Contents Page No
Introduction to NHL-10 troubleshooting .......................................................................................................4
Dead or jammed phone ................................................................................................................................5
BB Selftest tools ............................................................................................................................................5
Flash programming fault .............................................................................................................................7
General Power checking ..............................................................................................................................8
Baseband serial interface troubleshooting ............................................................................................9
CBUS ..........................................................................................................................................................9
FBUS .........................................................................................................................................................10
MBUS .......................................................................................................................................................10
Energy management calibration .............................................................................................................14
Troubleshooting tips ...................................................................................................................................14
ADC-offset over limits ........................................................................................................................14
BSI Gain over limits .............................................................................................................................14
Vbatt offset and Gain .........................................................................................................................14
Vchar over limits ..................................................................................................................................14
Ichar over limits ....................................................................................................................................14
ADC-reading .................................................................................................................................................14
Backup battery .............................................................................................................................................15
IrDA Interface Fault ....................................................................................................................................17
SIM Card Fault ..............................................................................................................................................18
“Insert SIM Card” in device display although card is inserted .......................................................21
Keypad Interface Fault ...............................................................................................................................22
Display Fault .................................................................................................................................................23
Illumination Fault (Display/Keyboard backlight) ................................................................................24
MMC Interface Fault ..................................................................................................................................25
Audio troubleshooting ...............................................................................................................................26
Microphone ............................................................................................................................................26
Earpiece ..................................................................................................................................................28
IHF ............................................................................................................................................................30
Accessory detection troubleshooting .............................................................................................32
Camera Module Troubleshooting ...................................................................................................................33
Terms ...............................................................................................................................................................33
Image taking condition effect on image quality ................................................................................33
Image quality analysis .......................................................................................................................................38
Possible faults in image quality ..............................................................................................................38
Testing for dust ............................................................................................................................................38
Testing for sharpness ..................................................................................................................................39
Bit errors ........................................................................................................................................................40
Hardware failure message ........................................................................................................................41
No recognizable viewfinder image .........................................................................................................42
Bad image quality .......................................................................................................................................43
Baseband Tuning operation .............................................................................................................................44
Energy management calibration .............................................................................................................44
Connections ...........................................................................................................................................44
Phoenix Setup .......................................................................................................................................44

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CCS Technical Documentation Baseband Troubleshooting
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Calibration procedure with JBV-1................................................................................................... 45
Zocus (IBAT) calibration with MJ-2 module jig.................................................................................. 46
Connections ...........................................................................................................................................46
Phoenix Setup .......................................................................................................................................46
Zocus (IBAT) calibration procedure with MJ-2 module jig ..............................................................47

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Baseband Troubleshooting CCS Technical Documentation
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Copyright © 2003 Nokia. All Rights Reserved.
Introduction to NHL-10 troubleshooting
This document is intended to be a guide for localizing and repairing electrical faults in the NHL-
10 device. The fault repairing is divided into troubleshooting paths.
The following diagrams describe baseband troubleshooting.
Figure 1: Main Troubleshooting Diagram

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CCS Technical Documentation Baseband Troubleshooting
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Dead or jammed phone Figure 2: Phone is jammed or dead
BB Selftest tools
“Selftest failed. Contact service.” on display
This fault means that the software is able to run and thus the watchdog of UEM can be served.
Selftest functions are executed when the phone is powered on, and if one or more selftest func-
tions fail, the message “Selftest failed. Contact service.” is shown on the display.
MCU selftest cases can be split into two categories: The ones that are executed during power
up and the ones that are executed only with a PC connected. These tests and the items includ-
ed are as follows:

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Figure 3: BB self test items

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Flash programming fault Figure 4: Flashing troubleshooting

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General Power checking Figure 5: General Power check

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Baseband serial interface troubleshooting
CBUS
CBUS is a three wire serial interface between the main baseband components. The bus con-
sists of data, clock and bus_enable signals. In NHL-10 the bus is connected from UPP_WD2
to UEM and the BT module. UPP_WD2 takes care of controlling the traffic on the bus.
If the interface is faulty from the UPP WD2's end the phone will not boot properly as powering
configurations do not work. Traffic on the bus can be monitored from three pins on the BT mod-
ule.
Pins are shown below.
Figure 6: CBUS test points
CBUS traffic is shown in the figure below (Read command to Zocus, LM3819, N380).
CbusClk is connected to Ch1, Cbus Da to Ch2 and CbusEnx to Ch3.

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Figure 7: CBUS waveform
If you are able to get the phone to boot up and can reach Phoenix BB self tests it is possible to
test the functionality of each component attached to Cbus. Use:
• ST_UEM_CBUS_IF_TEST to test UEM Cbus interface
• ST_LPRF_IF_TEST to test Bluetooth Cbus interface
• ST_ZOCUS_CBUS_IF_TEST to test Zocus Cbus interface
If an error is found testing any of the above components you should replace or re-solder the
failing component.
FBUS
FBUS is a two wire RX and TX interface between UPP and flash/test interface. The bus goes
through UEM, which adjusts the voltage levels to suit UPP_WD2. The interface voltage level
on the phone flash/test pad pattern is 2.78V and on the UPP WD2 end it is 1.8V.
The functionality of this interface should not affect the device boot into NORMAL, LOCAL nor
TEST modes. Phoenix tests can be performed through the MBUS interface in case of a failure
in FBUS interface. Flashing is not possible if there is a problem in FBUS interface.
MBUS
MBUS is a two-wire RX and TX interface between UPP and UEM. From UEM the interface con-
tinues to flash/test interface as a one-wire interface. UEM adjusts the voltage levels.

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CCS Technical Documentation Baseband Troubleshooting
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The interface voltage level on the phone flash/test pad pattern is 2.78V and on the UPP WD2
end it is 1.8V. The MBUS traffic between UPP WD2 and UEM can be tested with PHOENIX
(ST_MBUS_RX_TX_LOOP_TEST). Flashing is not possible if there is a problem in MBUS.

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Charger Interface troubleshooting
Figure 8: Not charging on display

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Figure 9: Charger nothing happened

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Energy management calibration
During energy management calibration, the A/D converter, BSI, Btemp, Battery voltage, Charg-
er voltage and Charger current are calibrated. For detailed information and instructions see
EM-calibration instructions in the service manual.
Troubleshooting tips
ADC-offset over limits
Inspect the BSI line, connectors (hotbar and board to board connector) and components in it
(Capacitor C226, ASIP R385, Pull-up resistor R220). If these are OK, change UEM.
BSI Gain over limits
Inspect the BSI line, connectors (hotbar and board to board connector) and components in it
(Capacitor C226, ASIP R385, Pull-up resistor R220). If these are OK, change UEM.
Vbatt offset and Gain
Inspect Vbatt lines and components in it.
Vchar over limits
Inspect components that are connected Vchar line: Filtering capacitors C384, C385, TVS
V381, L380 and Fuse F380. If those are OK, change UEM.
Ichar over limits
Inspect components that are connected Vchar line: Filtering capacitors C384, C385, TVS
V381, L380 and Fuse F380. If those are OK, first change the current sense resistor (R190), if
calibration is not still successful change UEM.
Calibration can be checked using ADC-reading. Known voltages, currents and resistances are
fed and read by ADC-reading, read values and known values can be compared.
ADC-reading
Divided and scaled battery voltage, Charger voltage, Charger current and BSI values can be
read by this tool. Read values a few times before you can be sure that results are accurate.

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Figure 10: ADC-reading view
Backup battery
Symptom of backup battery fault is:
Real Time Clock loses the correct time during a short main battery removal.
The same symptom can also be seen whenthe backup battery is empty. About 5hours is need-
ed to fully charge the backup battery in the device.
Note: The backup battery is charged only at the same time with main battery charging. Or when the
device is in LOCAL or TEST mode.
Table 1: Maximum tolerances
Reading Check point Tolerance
Vbatt SCAL_ 4.2V ±25mV
Vchar 8.4V ±40mV
Ichar 500mA ±20mV
BSI 75k (BL-5C) ±1.3kohm
Btemp 273K (47k) ±5K

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Always check the backup battery visually for any leakage or any other visual defect.
Check that the backup battery is correctly mounted in the device before closing the cover.
Check with Phoenix that the backup battery is OK.
Measure the voltage of the backup battery
• Normal operation when the voltage is > 2.0V
• Fully charged when the voltage is about 3.2V
Enable backup battery charging. (Start to charge the main battery or boot the device to LOCAL
or TEST mode.)
Measure the voltage of the backup battery during charging, it should arise if it is not 3.2V, yet.
When the voltage is over 2.0V for sure, check the backup battery with Phoenix.

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IrDA Interface Fault
At this point it is supposed that the problem is in the HW.
Figure 11: IrDA interface troubleshooting

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Baseband Troubleshooting CCS Technical Documentation
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SIM Card Fault
The whole SIM interface is located in two chips, UPP_WD2 and UEMK. UEMK contains the
SIM interface logic level shifting. UPP_WD2 provides SIMClk through UEMK to the SIM. The
SIM interface supports both 3V and 1.8V SIMs. There is an EMIF component (3 Lines EMI fil-
ter) between the SIM card and UEMK, which isn’t shown in the below picture.
Figure 12: UPP_WD2 and UEMK SIM connections
The SIM power up/down sequence is generated in the UEMK. This means that the UEMK gen-
eratestheRSTsignaltothe SIM. The carddetectionistakenfromthe BSI signal, which detects
the removal of the battery. Monitoring of the BSI signal is done by a comparator inside UEMK.
The threshold voltage is calculated from the battery size specifications.
First the SW attempts to power up the SIM with 1.8V. If this does not succeed, power up is re-
peated with VSIM switched to 3V.
The data communication between the card and the phone is asynchronous half duplex. The
clock supplied to the card is in GSM system 1.083MHz or 3.25MHz. The data boud rate is SIM
card clock frequency divided by 372 (by default), 64, 32 or 16.
UEMK
UEMK

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Figure 13: SIM Power up waveform
Ch1: VSIM
Ch2: I/O
Ch3: Clock
Ch4: Reset