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 RX and TX Service Network Problems

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zakagadir
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عدد المساهمات : 3267
تاريخ التسجيل : 17/11/2007

مُساهمةموضوع: RX and TX Service Network Problems   الثلاثاء سبتمبر 09, 2008 2:02 pm


RX and TX Service Network Problems ::..





there
is two sections in network 1, Rx section. 2, Tx section. all technicians need
to use manual searching in mobile phone, testing for Rx section and Tx section.



HOW TO FIND WHICH SECTION IS FAULT Tx (or) Rx?



Testing Rx section

use manual search for Testing Rx section, after searching Rx section good
condition means it shows network list like MEDITEL, MAROC TELECO, (or) any other
network list in your area,


If Rx section bad condition after searching it shows NO NETWORK FOUND

1, after searching it shows network list means Rx section is ok.
2, after searching it shows NO NETWORK FOUND or some networks missing means
Rx section is faulty.


Testing Tx section

Use manual search for testing Tx section, after searching it shows network
list, then you can choose your simcard network, if Tx section is good condition
it shows HOME NETWORK SELECTED, if Tx section is fault it shows NO ACCESS.


1, after selecting network it shows HOME NETWORK SELECTED means Tx section
is ok.

2, after selected network it shows NO ACCESS means Tx section is fault.



Information of Rx section components and ics



1, antenna switch

2, RF IC ( Hagar ic )

3, AUDIO IC ( cobba ic)

4, crystal oscillator

5, filters

6, VCO (voltage control oscillator)



Information of Tx section components and ics


1, PF IC (PA IC)



Information of Rx section components and ics

1, antenna switch

2, filters

3, RF IC

4, crystal oscillator

5, VCO (voltage control oscillator)

6, UEM IC


Information of Tx section components and ics


1, PF IC (PA IC)



HOW TO SERVICE Rx SECTION FAULT ?



Solution for Rx section no network found fault

1,clean the pcb well and Rehot (if not ok follow one by one solutions)

1, give antenna switch jumper

2, Rehot the RF IC

3, Rehot the AUDIO IC

4, Reball the RF IC

5, change the RF IC

6, change the AUDIO IC

7, change the crystal oscillator


Solution for Rx section NO NETWORK FOUND fault

1, clean the pcb well and Rehot (if not ok follow one by one solutions)

2, give antenna switch jumper

3, Reheat the RF IC

4, change the crystal oscillator

5, Reball the RF IC




6, change the RF IC

7, Change filters


HOW TO SERVICE Tx SECTION FAULT ?


Solution for Tx section NO ACCESS

1, Change the PF IC


Solution for Tx section NO ACCESS fault


1, Change the PF IC


SOLUTION FOR OTHER NETWORK FUALT


Solution for low network coverage, all models


1, give jumper from antenna contact to cabinet antenna

2, change the antenna switch



When switch on the mobile it shows full network after few seconds its goas
down



1, flash - Rebuild ime - UI settings (if not ok follow 2nd solution)

2, check the track from battery +ve point to PA IC, if track is ok then
change the good PF IC.





When switch on the mobile it shows full network after few seconds its goas
down



1, write good pm file (if not ok follow 2nd solution)

2, change the PF IC, if still the problem same check the PF power track to
battery +ve point

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RX and TX Service Network Problems
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