Nokia 6820 Service Manual 07 rh26 trouble
CCS Technical Documentation
RH-26 Series Transceivers
7 - Troubleshooting Instructions
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RH-26
7 - Troubleshooting Instructions CCS Technical Documentation
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CCS Technical Documentation 7 - Troubleshooting Instructions
Table of Contents
Page No
RF Troubleshooting ....................................................................................................... 4
RF key component placement .....................................................................................6
RF measurement points ...............................................................................................7
GSM850, GSM1800 and GSM1900 Transmitter ........................................................9
General instructions for Tx troubleshooting ............................................................. 9
Transmitter troubleshooting diagram ........................................................................10
PA/antenna switch troubleshooting diagram .............................................................11
Pictures of transmitter signals ....................................................................................12
Additional Information for EDGE troubleshooting..................................................... 14
Transmitter EDGE troubleshooting diagram .............................................................15
PA & antenna switch EDGE troubleshooting diagram .............................................16
Pictures of EDGE transmitter signals ........................................................................17
GSM850, GSM1800 and GSM1900 Receiver............................................................. 18
General instructions for Rx troubleshooting ..............................................................18
Troubleshooting diagram for GSM850 receiver ........................................................20
Troubleshooting diagram for GSM1800 receiver ......................................................21
Troubleshooting diagram for GSM 1900 receiver .....................................................22
Synthesizer................................................................................................................... 23
General instructions for synthesizer troubleshooting ................................................23
Synthesizer troubleshooting diagram ........................................................................24
Pictures of synthesizer signals ...................................................................................25
Baseband Troubleshooting........................................................................................... 26
Faults by symptom .....................................................................................................28
SIM card.................................................................................................................. 28
Display .................................................................................................................... 29
Keypad .................................................................................................................... 30
Lights....................................................................................................................... 32
Charging.................................................................................................................. 34
Pop-PortTM system connector................................................................................ 34
Audio....................................................................................................................... 37
Vibra........................................................................................................................ 41
Real time clock battery............................................................................................ 41
Flip position recognition ......................................................................................... 41
IR............................................................................................................................. 42
Bluetooth................................................................................................................. 42
Camera .................................................................................................................... 43
Baseband calibration ..................................................................................................45
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CCS Technical Documentation 7 - Troubleshooting Instructions
RF Troubleshooting
Measurements should be done using a spectrum analyzer with a high-frequency highimpedance passive probe (LO-/reference frequencies and RF power levels) and an oscilloscope with a 10:1 probe (DC-voltages and low frequency signals)
The RF-section is build around one RF-ASIC (HELGO N500).
Most RF semiconductors are static discharge sensitive! So ESD protection must be
taken care of during repair (ground straps and ESD soldering irons).
Apart from key components described in this document there are a lot of discrete components (resistors, inductors and capacitors). Their troubleshooting is done by checking
that the soldering of the component is done properly (for factory repairs checking if it is
missing from the PWB). Capacitor can be checked for shortening and resistors for value
by means of an ohmmeter, but be aware, in-circuit measurements should be evaluated
carefully.
Please be note that all measured voltages or RF levels in this document are rough figures.
Especially RF levels vary due to different measuring equipment and different grounding
of the probe used. When using the RF probe, use metallic tweezers to connect the probe
ground to the PWB ground as close to measurement point as possible.
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RF key component placement
Figure 1: RF key component placement - top side
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CCS Technical Documentation 7 - Troubleshooting Instructions
RF measurement points
Figure 2: RF measurement points - top side
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Figure 3: RF measurement points - bottom side
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CCS Technical Documentation 7 - Troubleshooting Instructions
GSM850, GSM1800 and GSM1900 Transmitter
General instructions for Tx troubleshooting
1 Connect test jig to computer with DAU-9S cable or to FPS-8 flash prommer with
XCS-4 modular cable.
Make sure that you have PKD-1 dongle connected to computers parallel port.
2 Connect DC power supply to module test jig with FLC-2 cable.
Note: When repairing or tuning transmitter use external DC supply with at
least 3A current capability. Set the DC supply voltage to 4.2V.
3 Connect an RF cable to the module test jig (MJ-5), RF connector to measurement
equipment or at least 10dB attenuator, otherwise the PA may be damaged. Normally a spectrum analyzer is used as measurement equipment.
Note: Normally spectrum analyzer maximum input power is +30dBm. It is recommended to use 10dB attenuator in spectrum analyzer input to prevent damage.
4 Set the phone module to test jig and start Phoenix service software.
5 To initialize connection to the phone (when using FPS-8 together with DAU-9S
and COMBOX driver, use FBUS driver):
• From the File menu, choose Product.
• Select RH-26.
• From the toolbar, set operating mode to "Local".
6 To activate the RF controls window:
From the Testing menu, choose RF Controls
7 In the RF controls window:
• Select band "GSM850", "GSM 1800" or “GSM1900 (Default = "GSM850").
• Set Active unit to "Tx" (Default = "Rx").
• Set Operation mode to "Burst" (Default = "Burst").
• Set Tx data type to "Random" (Default = "All1").
• Set Rx/Tx channel to 37 on GSM850 band or 700 on GSM1800 band or 661 on
GSM1900 (Defaults).
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• Set Tx PA mode to "Free" (Default).
• Set power level to 5 (Default = 19) on GSM850 or to 0 (Default = 15) on
GSM1800 and GSM1900.
Transmitter troubleshooting diagram
= beyond economical repair
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PA/antenna switch troubleshooting diagram
= beyond economical repair
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Pictures of transmitter signals
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Additional Information for EDGE troubleshooting
Note! EDGE mode troubleshooting differs slightly from basic GSM troubleshooting.
1 Establish connection to the phone normally (see GSM850/GSM1800/GSM1900
troubleshooting instructions).
2 From the File menu, choose Product.
3 Select RH-26.
4 From the toolbar, set operating mode to “Local”.
5 To activate the RF Controls window:
• From the Testing menu, choose RF Controls.
6 In the RF Controls window:
• Select Band “GSM850”, “GSM1800” or “GSM1900” (Default = “GSM850”).
• Set Active unit to “Tx” (Default “Rx”).
• Set Edge “On” (Default = “Off”).
• Set Operation mode to “Burst” (Default = “Burst”).
• Set Tx data type to “Alternate PN9” (Default = “All 1”).
• Set Rx/Tx channel to 37 on GSM850, 700 on GSM1800 or 661 on GSM1900
(Defaults).
• Set Power level to 8 on GSM850 (Default = “19”) or to 2 on GSM1800 and
GSM1900 (Default = “15”).
NOTE! For GSM850 EDGE power levels 5, 6 and 7 are not in use and for GSM1800 and GSM1900
EDGE power levels 0 and 1 are not in use.
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