Appendix A: RF Troubleshooting
Nokia Customer Care
Company Confidential
Copyright
©
2005 Nokia. All rights reserved
A-62
3.2.3.1.3.1 R7503 in place and working correctly?
•
Check that the component is in place and solder joints are ok
•
Disconnect the power supply from the phone and check R7503 resistance value with an
ohmmeter
3.2.3.1.3.2 Capacitors C7518, C7520 and C7570 working correctly?
•
Check that components are in place and solder joints are ok
•
Disconnect the power supply from the phone and use an ohmmeter to check that capacitors
are not short-circuited. If short-circuit is found replace capacitors mentioned above. If this
does not help go to the next step.
3.2.3.1.3.3 Replace Hinku (N7500) or Vinku (N7501) or both
3.2.3.1.4 Replace Hinku (N7500)
3.2.3.2 Replace Hinku (N7500)
•
Also RAP3G can be faulty but it’s not possible to replace this component
3.2.4 RAP3G faulty?
•
Not possible to replace!
3.3 GSM Transmitter phase error ok?
•
GSM transmitter has to be active before measurements. Procedure is explained in section
“Transmitter troubleshooting”. Change TX data type to “Random” in Phoenix.
•
Measurement can be done with a GSM transmitter tester or other GSM communication tester.
Trigger to TX burst midamble should be used.
•
Attach the phone to the product specific test jig and the RF-measurement device to the
RF-coupler. Coupler attenuation should be also taken into account during measurements.
•
The RMS Phase error shall not be greater than 5
°
and the peak phase error not greater than
20
°
.
•
If phase error is not as expected separate the phone into parts and place to the module jig
3.3.1 Are capacitors in Vinku REG1 and REG2 lines in place?
C7554, C7555 and C7547 (GSM1800 and GSM1900: also C7552)
•
Check that components are in place and solder joints are ok
3.3.2 Are capacitors in GSM PA power supply line in place?
•
C7569 and C7583
•
Check that component is in place and solder joints are ok
Summary of Contents for RM-57
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