Nokia RM-94 Rf Troubleshooting Instructions page 13

RM-94
6(b) - RF Troubleshooting
Make sure that
Synthesizer is working
Yes
All 3 bands
Phoenix:
Phone: local mode
Open RF Controls :
Active Unit: Rx
Op. Mode: Burst
Rx/Tx channel: default (mid)
Signal Generator:
Level: –80dBm
Frequency: calculated from
Phoenix + 67.71kHz
Phoenix:
Open RSSI reading
Check RSSI Level = -80dBm
No
Execute Rx Calibration in selected
band, refer to chapter 9.2.1
Are calibration results within limits?
No
Are all 3 bands measured?
Yes
Are all 3 bands defective?
Yes
Oscilloscope:
Check supply voltages of RF ASIC:
VR4 = 2.8V ? (TP: VR4)
Yes
Oscilloscope:
Check supply voltages of RF ASIC:
VR6 = 2.8V ? (TP:VR6)
Yes
Issue 1 04/2005
see
Synthesizer Fault
No
Finding Tree
Selected band is working and
calibrated.
Yes
Are all 3 bands measured?
Yes
No
Continue with single
No
band fault finding.
Check supply filter
components (C2233,
No
C7519, C7520) and UEM
Check supply filter
No
components (C2231,
C7521) and UEM
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Yes
Rx chain is functional
and calibrated
Receiver
Fault Finding Tree
part 1
= To be done in all
three bands.
No next band
Receiver
Fault Finding Tree
part 2
Receiver
Fault Finding Tree
part 3
13