Nokia RH-37 Series Rf Troubleshooting Instructions page 15

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Oscilloscope :
Check reference voltages of RF part:
VrefRF01 = 1.35V ?
(TP: VrefRF01*)
Yes
Oscilloscope :
Check reference voltages of RF part:
VrefRF02 = 1.35V ?
(TPs: VrefRF02* and VrefRF02**)
Yes
Phoenix:
Phone: local mode
RF Controls :
Active Unit: Rx
Op. Mode: Continuous
Rx/Tx channel: default (mid)
AGC: 14
Signal Generator:
To be tuned that input power at spectrum
analyzer: –60dBm
(power at probe: Pref = approx. -63 dBm)
Frequency: calculated from Phoenix
offset: 67.71kHz
Spectrum Analyzer:
Check Rx/Tx Switch (Diplexer)
Depending on selected band, check level at TPs:
GSM900 output Rx1
GSM1800 output Rx2
GSM1900 output Rx3
Yes
Oscilloscope:
RX IQ levels ok (TPs: RXI, RXQ) ?
Yes
Oscilloscope:
RF-BB serial interface ok?
(TPs: RFBusData, RFBusClk, RFBusEna1)
Issue 1 07/04
No
No
1)
No
Pref -1.5dB ?
Pref -2.0dB ?
Pref -2.5dB ?
No
No
Yes
Nokia Corporation
6(b) - RF Troubleshooting Instructions
Check supply filter
components (R7511,
C7524) and UEM
Check supply filter
components (R2900,
R2901, C2900, C2901)
and UEM
Change Z7800
1)
Note :
RF levels are dependent on RF probe and have to be validated
with a known good sample.
Change RF
ASIC (Helgo)
BB error:
Check UPP
Change RF
ASIC (Helgo)
RH-37
Receiver
Fault Finding Tree
part 4
Receiver
Fault Finding Tree
part 5
Receiver
Fault Finding Tree
part 6
Page 15