Nokia 8390 Manuales De Servicio
NSB-8
Troubleshooting Instructions
PAMS Technical Documentation
Page 56
ãNokia Corporation
Issue 1 01/02
NO TX GSM 1900
8 Check 26MHz VCTCXO G660 at (test point) TP20. (frequency deviation <100Hz)
Check also TP3 2.8VDC.
9 Check TX IQ signals at TP21. If not OK change UEM.
10 Check 1880MHz CH661 at TP22 if OK go to 8.
11 Check supply voltages for HAGAR at TP 4, 5, 6, 8: 2.8VDC; TP10 1.35VDC and TP1
10 Check 1880MHz CH661 at TP22 if OK go to 8.
11 Check supply voltages for HAGAR at TP 4, 5, 6, 8: 2.8VDC; TP10 1.35VDC and TP1
4.8VDC if not OK change UEM.
12 Check SDATA at TP51, SCLK TP53, SLE TP52.
13 Check TXC at TP23 and TXP at TP24
14 Check frequency of VCO G650 at TP40 (3760MHz/CH661, TX-mode). If not OK
13 Check TXC at TP23 and TXP at TP24
14 Check frequency of VCO G650 at TP40 (3760MHz/CH661, TX-mode). If not OK
check TP7 2.8VDC and TP41
~1.6VDC. If TP41 is 4.8VDC, the VCO doesn’t work in
all probability. If all HAGAR signals are OK probably HAGAR is broken -> change
HAGAR N600.
HAGAR N600.
15 Check 1880MHz at TP25 if not OK check Vbatt at TP9 3.9VDC, also check TP26
and TP27. Change PA if necessary.
16 Check 1880MHz at TP30 if not OK, check TP28. Also check TP29 squarewave
2.8Vpp at burst mode. If TP28 and TP29 OK change Z500 (Antenna switch).
NO RX GSM 1900
1 Check 26MHz VCTCXO G660 at (test point) TP20. (frequency deviation <100Hz)
Check also TP3 2.8VDC.
2 Check RX signal level 1960MHz at TP31 if not OK change Z500.
3 Check RX signal level at TP32 in not OK change Z520
4 Check RX signal level at TP33 if not OK check voltages at TP33 2.7VDC , TP34
3 Check RX signal level at TP32 in not OK change Z520
4 Check RX signal level at TP33 if not OK check voltages at TP33 2.7VDC , TP34
2.7VDC , TP35 0VDC. If TP33 not OK check L550 and R550. If components are OK
change V550. If that doesn’t help change HAGAR N600.
change V550. If that doesn’t help change HAGAR N600.
5 Check RX signal level at TP36 If not OK change Z551.
6 Check RX IQ signals at TP37 (also in burst-mode). If not OK check HAGAR supply
6 Check RX IQ signals at TP37 (also in burst-mode). If not OK check HAGAR supply
voltages at TP4, 5, 6, 8: 2.8VDC; TP10 1.35VDC and TP1 4.8VDC if not OK
change UEM.
change UEM.
7 Check SDATA at TP51, SCLK TP53, SLE TP52.
8 Check frequency of VCO G650 at TP40 (3920MHz/CH661, RX cont.-mode). If not
8 Check frequency of VCO G650 at TP40 (3920MHz/CH661, RX cont.-mode). If not
OK check TP7 2.8VDC and TP41 ~2.9VDC. If TP41 is 4.8VDC, the VCO doesn’t work
in all probability. If all HAGAR signals are OK probably HAGAR is broken ->
change HAGAR N600.
in all probability. If all HAGAR signals are OK probably HAGAR is broken ->
change HAGAR N600.
9 If all signal and voltage levels are OK change UEM.
Please note that you can view the RF testpoint diagram and RF testpoint
PWB layout in the Schematics section of this document.
PWB layout in the Schematics section of this document.