8210 sometimes no signal

[Destructor]

maybe 10 times in one day there is no network on mobile,turn it of and again on,sthen signal is ok,I can make a call without any problems,any ideas

[NICE]

FIRST ... TRY 2 CHANGE ANTENNA SWITCH .. IF NO .. CHANGE 26 MHZ CRYSTAL ....

[flechazo]

resolde PA

[PaRMaN]

change your ccont

[moguth]

...or make it rihgt - change the cobba

²NICE

if the diplexer is dead - the phone would make other problems
chrystal - ? - maybe - but i still think -> cobba

²flechazo

PA ? - i dont think so !

²PaRMaN

ccont ? - nope - the phone would make many errors, but thatkind of problems is not ccont related

[Raheeeeb]

Originally posted by moguth
...or make it rihgt - change the cobba

²NICE

if the diplexer is dead - the phone would make other problems
chrystal - ? - maybe - but i still think -> cobba

²flechazo

PA ? - i dont think so !

²PaRMaN

ccont ? - nope - the phone would make many errors, but thatkind of problems is not ccont related

i like the way you comment lolol

by the way can you tell me please what the function of the hagar or its not affect the signal malfunction

[moguth]

²raheeeeb

thx - i did my best shot

the the function of the hagar is "simple" - the hagar devides the frequency, that can make some singnal malfunctions, but when the hagar is defective - the phone makes more funny things:

when you set the network search mode to manual - the phone will reboot

the phone has problems like deadlocks(it hangs), different menu speed (like not responding and then it makes a lot of moves at once), startup failure (freezing), auto power off

i repair around 15 8210 (incl. 8250 and 8850 . it´s almost the same board) per week - 80 % with defective cobba, the rest has ccont, pa, diplexer or chaps problems

[Destructor]

what can I say,thanks

[Raheeeeb]

you are right that most of the signal problem come from
1- cobba ( al most )
2-annena switch
3-pa
4- c 153 or ccount

but the problems you mention the majorty of it comes from clock and crystales are you test me freind lololol

[moguth]

Originally posted by raheeeeb
but the problems you mention the majorty of it comes from clock and crystales are you test me freind lololol

if you think so....

but i had never problems with b100 @8210
vco or vctcxo - can be (in case of the problems i mentioned in my last posting - the vctcxo can also be defective - but if you take a look in the SM, you will find the scheme for this circuit:
G830 - 26Mhz -> hagar /2 = 13Mhz -> clock signal buffer v800 -> mad

it´s always a "problem" with the 8210, but b100 was not really a problem in the 82xx series

[Raheeeeb]

Originally posted by moguth
²raheeeeb

thx - i did my best shot

the the function of the hagar is "simple" - the hagar devides the frequency, that can make some singnal malfunctions, but when the hagar is defective - the phone makes more funny things:

when you set the network search mode to manual - the phone will reboot

the phone has problems like deadlocks(it hangs), different menu speed (like not responding and then it makes a lot of moves at once), startup failure (freezing), auto power off

i repair around 15 8210 (incl. 8250 and 8850 . it´s almost the same board) per week - 80 % with defective cobba, the rest has ccont, pa, diplexer or chaps problems

yes it never make any problem the b100 i just comment at your talks restart diffrent menu speed never from hagar its from 32 khz clock and some restart problems from 26 mhz crystal
i think this clear cuz in my steps i never mention any b100 see my lat p[ost befor this

[moguth]

Originally posted by raheeeeb
yes it never make any problem the b100 i just comment at your talks restart diffrent menu speed never from hagar its from 32 khz clock and some restart problems from 26 mhz crystal
i think this clear cuz in my steps i never mention any b100 see my lat p[ost befor this

since we are only talking about "CLOCK" - that includes the b100 -> 32.768kHz

am i right or am i right ?????
(i know that i´m a smart*****)

[needi]

so the conclusion is that ...you have to change CCONT , COBBA , 26 MHz crystal and VCO and some resistors......

[sawa]

try wintesla to mesure if the foult is in RX or TX part...mesurewith win tesla if COBBA is good soldered(when do readings press the board above cobe and see if there is big variations in reading's)...and check with win tesla HFR/efr if they are closed)))


tryy and post.....if you have problems....ICQ me!!!!