Nokia RH-37 Series Rf Troubleshooting Instructions page 14

RH-37
6(b) - RF Troubleshooting Instructions
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
Page 14
see
Synthesizer Fault
No
Finding Tree
Selected band is working and
calibrated.
Yes
Are all 3 bands measured?
Yes
Rx chain is functional
and calibrated
No
Continue with single
No
band fault finding.
Check supply filter
No components (C2233,
C7519, C7520) and UEM
Check supply filter
No
components (C2231,
C7521) and UEM
Nokia Corporation
Nokia Customer Care
Receiver
Fault Finding Tree
part 1
= To be done in all
three bands.
No
Yes
Receiver
Fault Finding Tree
part 2
Receiver
Fault Finding Tree
part 3
next band
Issue 1 07/04