Nokia 6310i Service Manual page 212

NPL-1
6 - Troubleshooting
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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
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RX Fault finding
Tree
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 Yes
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
Yes
Z601
Rx output
EGSMout
(900,1800,1900)
-76dBm
> -75dBm
?
No
Change
Z601
= to be done only once
(common for all bands)
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Osci: Osci:
SA SA
RF-BB Yes RX I/Q
Z601 Z601 Yes
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)
BB Error
Check UEM
Check
Check
Yes
Bias
LNA
Osci: Osci:
SA SA
RX -BB bias LNA
Z601 Z601
Yes
(VR4)
EGSMout base voltage EGSMout
=2.8V = 0.8V
-76dBm -76dBm
? ?
No No
Change
Check
Mjolner
C871
and
BB (UEM)
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