User Guide

RH-4 Company Confidential
7 - RF Description & Troubleshooting CCS Technical Documentation
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RX Fault finding
Apply -80dBm signal
from Generator
to Antenna Connector
phone: local, burst mode
Rx chain
functional
RX calibration
Yes
No
EGSM,
PCS, PCN
RSSI reading
-80dBm
all bands
?
Yes
No
Calibrtion.
witin
limits
?
Yes
No
EGSM,
PCS, PCN
SNR measurement
all bands
o.k.
?
Apply -92dBm signal
from Generator
to Antenna Connector
phone: local, burst mode
RSSI
and SNR
wrong in all 3
bands
?
No
Change generator level
to -55dBm
phone: local,
continous mode
SA
Z601
EGSMout
-76dBm
Yes
No
SA
Z601
Rx output
(900,1800,1900)
> -75dBm
?
SA
Z601
EGSMout
-76dBm
Yes
No
SA
Z604,Z602,Z603
SAWout
both lines
>-78dBm
?
Change
Z604,Z602,Z603
Check
RxTx Switch
Change
Z601
Yes
SA
Z601
EGSMout
-76dBm
No
Osci:
RF-BB
serial
Interface
o.k.
?
Yes
SA
Z601
EGSMout
-76dBm
No
Osci:
RX I/Q
level
o.k.
?
Change
Mjolner
Yes
BB Error
Check UEM
Check
SAW
SA
Z601
EGSMout
-76dBm
No
Osci:
LNA
base voltage
= 0.8V
?
Change
Mjolner
Check
LNA
SA
Z601
EGSMout
-76dBm
Yes
No
Osci:
LNA bias
(VR6)
=2.8V
?
Check
C620, C632
and
BB (UEM)
Yes
SA
Z601
EGSMout
-76dBm
No
Osci:
RX -BB bias
(VR4)
=2.8V
?
Check
C871
and
BB (UEM)
Check
Bias
Check
Bias
= to be done in all 3 bands
= to be done in
defective band only
= to be done only once
(common for all bands)
BB Error
Check UPP
Make sure that
Synthesiser
is working
Yes
Note: RF levels given in that chart are dependent on RF probe and must be validated with a known good sample