Nokia 6610 - Cell Phone 625 KB, Руководство по обслуживанию

Страница: 160 / 273

NHL-4/4U Company confidential
Troubleshooting Instructions CCS Technical Documentation
3DJH

1RNLD&RUSRUDWLRQ ,VVXH
7URXEOHVKRRWLQJGLDJUDPIRU*60UHFHLYHU
3KRQHLQ¦&RQWLQXRXV§PRGH$*&VHWWLQJ¦
)LJXUH*60UHFHLYHUWURXEOHVKRRWLQJ
Yes
Yes
Yes
Yes
No No
Yes
Yes
No No Yes No Yes
Apply –90dBm
1842.86771MHz signal
from generator to anten-
na connector
Oscilloscope at
RX_I /RXQ
Signal 160mVpp
DC offset 1.35V ***
Frequency 67.7kHz Change ge-
nerator level
to –50dBm Spectrumanalyzer
Antenna Switch out-
put, GSM1900
–88 dBm
GSM1800 RX chain
functional
Spectrumanalyzer
4G VCO out
3685.6MHz
∼
–30 dBm (*
Oscilloscope
VANT_3 2.7VV
VANT_1/2 0V
Oscilloscope
LNA_VCC 2.6V
LNA_P 0 V
Oscilloscope
Check HELGA se-
rial interface (burst
mode)
Check HELGA
N500
Check Base-
band
Check C831,
L811
* Spectrumanalyzer
reading with 1 kohm
passive probe (right val-
ue add +26 dB)
All spectrumanalyzer reading
values are measured with 1
kohm passive probe (use
tweezers to connect the
probe ground to the nearest
PWB ground). Reading value
is represented w26
dB compensation.
Spectrumanalyzer
Antenna Switch input
–84 dBm
Spectrumanalyzer
HELGA inputs
GSM1900
–78 dBm
Check Antenna
switch Z800
Spectrumanalyzer
RX_SAW_out
–90 dBm
Check Baseband
Oscilloscope
VR1,3...6 2.7V
Check HELGA serial
interface
(burst mode)
Check Baseband
Yes
Check HELGA
N500
Yes
Check V802,
C826, Z802,
C829, C8097,
C808
Oscilloscope
VR1,3...6 2.7V
Check HELGA serial
interface
(burst mode)
Yes
Check Baseband
Synthesiszer trou-
bleshooting
Check HELGA
N500
* ** DC–level of RXI/RXQ in
continuous mode will decrease
slowly.
The original level can be resto-
red by rewriting gain set.