General Instructions For Rx Troubleshooting - Nokia RH-6 Series Rf Description & Troubleshooting

CCS Technical Documentation
Therefore, do not calibrate a defective phone before the phone error has been
found.
When a defective phone has been calibrated, a possible error in RX front end might be
masked. In that case one can have a reasonable RSSI reading, although the front end
shows excessive losses.
If it is not sure whether incorrect re-calibration has been taken place, following steps
can be done:
• Check if AGC calibration is within limits
• Check if SNR reading is o.k.
Use an Oscilloscope to check levels of "RXIINN" and "RXQINN".
Make sure that
Synthesiser
is working
Apply -80dBm signal
from Generator
to Antenna Connector
phone: local, burst mode
EGSM,
Apply -92dBm signal
PCS, PCN
No
from Generator
RSSI reading
-80dBm to Antenna Connector
all bands
phone: local, burst mode
?
Yes
RX calibration
Calibrtion.
No
witin
limits
?
Yes
Rx chain
functional
= to be done in all 3 bands = to be done in
defective band only
If RX and TX path seem to be faulty it has to be checked if the synthesizer is working.
If so, then check the path from the antenna pad J615 to the antenna switch Z601 (see RX
fault finding "Check RXTX switch").

General instructions for RX troubleshooting

Connect the phone module to a PC that runs Phoenix by appropriate means. Supply the
phone module with DC voltage of 3.6 V.
Then follow the instructions below.
Measuring RX I/Q signals using RSSI reading
Start Phoenix Service Software and open FBUS connection.
Issue 1 10/2003
Company Confidential
RX Fault finding
T
Note: RF levels given in that chart are dependent on RF probe and must be validated with a known good sample
RSSI
EGSM,
and SNR
PCS, PCN No
wrong in all 3
SNR measurement
bands
all bands
?
o.k.
?
Yes
No
Change generator level
to -55dBm
phone: local,
continous mode
Check
RxTx Switch
SA
SA
Z601
Z601
Rx output
EGSMout
(900,1800,1900)
-76dBm
> -75dBm
?
No
Change
Z601
= to be done only once
(common for all bands)
Copyright © 2003 Nokia Corporation.
Company Confidential
7 - RF Description & Troubleshooting
Osci: Osci:
SA SA
Yes
RF-BB Yes RX I/Q
Z601 Z601
serial level
EGSMout EGSMout
Interface o.k.
-76dBm -76dBm
?
o.k.
?
No No
BB Error
Change
Check UPP Mjolner
Check
Check
Bias
SAW
SA
Osci:
SA
SA
Z604,Z602,Z603
LNA bias
Yes
Yes Z601
Z601
SAWout
(VR6)
EGSMout
EGSMout
both lines
=2.8V
-76dBm
-76dBm
>-78dBm
?
?
No No
Change
Check
Z604,Z602,Z603
C620, C632
and
BB (UEM)
RH-6
Yes
BB Error
Check UEM
Check
Check
Yes
Bias
LNA
Osci: Osci:
SA SA
Yes RX -BB bias
Z601 LNA Z601
Yes
(VR4) base voltage
EGSMout EGSMout
=2.8V
-76dBm = 0.8V -76dBm
? ?
No No
Change
Check
Mjolner
C871
and
BB (UEM)
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