Fig 15 Receiver Fault Chart 6; Fig 16 Receiver Fault Chart 7 - Nokia NPL-4 Series Troubleshooting Instructions

NPL-4/5/RM-104
Troubleshooting Instructions
Oscilloscope:
RX IQ levels ok (RXI, RXQ)?
Yes
Oscilloscope:
RF-BB serial interface ok?
Select faulty band in Phoenix and continue measurements on dedicated Rx part.
Phoenix:
open SNR Measurement
Meas. Mode: Fast SNR
Press Measure.
Signal Generator:
Level: –92dBm
Frequency: calculated from Phoenix
Phoenix:
SNR measurement ok?
(SNR > 18.37dB)
No
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Figure 15: Receiver Fault Chart 6
Change RF
No
ASIC (Helgo)
BB error:
No
Check UPP
Change RF
Yes
ASIC (Helgo)
Figure 16: Receiver Fault Chart 7
Single band fault finding
Front end is ok.
Yes
Phoenix:
Phone:
RF Controls:
Active Unit:
Op. Mode:
Rx/Tx channel:
AGC:
Signal Generator:
Level:
Frequency:
Continue with Rx Fault Chart 6.
Nokia Customer Care
Receiver
Fault Chart 6.
Receiver
Fault Chart 7.
local mode
Rx
Continuous
default (mid)
12
–55dBm
calculated from Phoenix
no offset
Issue 2 05/05