8850 Full Signal, but can't make a call - GSM-Forum

MaRiN · 02-25-2003, 04:34

I have N8850 wich sometimes works ok, sometimes loosese signal, and sometimes have full signal but when I try to make a call only "beep beep beep" and nothing.
After few minutes it works normaly again, and then few calls later loses signal again or just can't make a call but have full signal

When it have full signal but can't make a call, I try to search network manually, find network ok, and logon to network ok.

When it loses signal and I try to search network manually, after long time find network ok, but have NO ACCESS message (PA is new)

I rehot all pcb, change PA and antena switch, but nothing.

What to change now, cobba, hagar, ccont, christal, resistors near PA,...?

kulibin · 02-25-2003, 06:38

I think this is Hagar, exchange it

Springer · 02-26-2003, 15:19

No, this is Cobba problem! (AGC)
Change Cobba, and recalculate checksums with Nk_calc (F1, F2-Enter, F3).
Try it, 100%

**sebagsm** · 02-26-2003, 20:45

Look your cobba id in nk_calc if it is 00000 there is a problem. But I think it is the power amplifier.... it is located next to the antenna switcher

amir-cairo · 02-26-2003, 23:26

hi man
yr broplem is so easy
just check yr FDK IC
hot on it by flux or change it
replay me a result
GOOD LUCK

Springer · 02-27-2003, 15:42

amir-cairo
Change FDK when Cobba id is 000000?
WHY?

CellM@n · 02-27-2003, 20:03

Check quality of conection between antenna and PCB. ( You can try to push it hard when making a call )

If u can call succesfully, it seem u have bad connection.
Usually, change the frame will solve the problem.

hope help

amir-cairo · 03-01-2003, 02:32

@Springer
who say that ?
FDK = a connection to network
u can`t make a connection if u have a failure on it
i am sure by that tested 100%

MaRiN · 03-01-2003, 04:34

My problem is in controling of antena switch!
When I put new 100% working PA and antena switch (I tested on other phone) I still have this problem with loosing signal but when I remove antena switch and just connect 3 points of antena switch with wire my phone is working normaly.

I want to know if it is bad for phone to work without antena switch, only with bypass? I heard that it is bad for PA.
Is it truth?

And how is controled antena switch?
I think this is my problem.

amir-cairo · 03-01-2003, 04:53

ok man i am glad to konw that
some one say that it is bad
but..
i think that no bropleme if u do that couse
if u make a connection u will have anttina and u haven`t anttena swich
i mean u convert yr (anttina swich ) to (anttina )
some body correct me if i wrong
best regardes

amir-cairo · 03-01-2003, 04:55

but i think that man
yr broplem in FDK maybe work some time with bridge and bake agaim but i didn`t wanna that
Regardes

02-25-2003, 04:34	#1 (permalink)
MaRiN Freak Poster Join Date: Nov 2000 Location: Croatia Age: 47 Posts: 353 Member: 2466 Status: Offline Thanks Meter: 10	8850 Full Signal, but can't make a call I have N8850 wich sometimes works ok, sometimes loosese signal, and sometimes have full signal but when I try to make a call only "beep beep beep" and nothing. After few minutes it works normaly again, and then few calls later loses signal again or just can't make a call but have full signal When it have full signal but can't make a call, I try to search network manually, find network ok, and logon to network ok. When it loses signal and I try to search network manually, after long time find network ok, but have NO ACCESS message (PA is new) I rehot all pcb, change PA and antena switch, but nothing. What to change now, cobba, hagar, ccont, christal, resistors near PA,...?

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02-25-2003, 06:38	#2 (permalink)
kulibin Freak Poster Join Date: Oct 2002 Age: 41 Posts: 423 Member: 16452 Status: Offline Thanks Meter: 4	I think this is Hagar, exchange it

02-26-2003, 15:19	#3 (permalink)
Springer Freak Poster Join Date: Sep 2002 Location: Nokialand Age: 43 Posts: 147 Member: 15909 Status: Offline Thanks Meter: 0	No, this is Cobba problem! (AGC) Change Cobba, and recalculate checksums with Nk_calc (F1, F2-Enter, F3). Try it, 100%

02-26-2003, 20:45	#4 (permalink)
sebagsm Moderator Join Date: Sep 2002 Location: Serbia/Hungary Age: 42 Posts: 1,045 Member: 15994 Status: Offline Thanks Meter: 263	Look your cobba id in nk_calc if it is 00000 there is a problem. But I think it is the power amplifier.... it is located next to the antenna switcher

02-26-2003, 23:26	#5 (permalink)
amir-cairo Freak Poster Join Date: May 2002 Location: egypt Age: 46 Posts: 238 Member: 11466 Status: Offline Thanks Meter: 0	hi man yr broplem is so easy just check yr FDK IC hot on it by flux or change it replay me a result GOOD LUCK

02-27-2003, 15:42	#6 (permalink)
Springer Freak Poster Join Date: Sep 2002 Location: Nokialand Age: 43 Posts: 147 Member: 15909 Status: Offline Thanks Meter: 0	amir-cairo Change FDK when Cobba id is 000000? WHY?

02-27-2003, 20:03	#7 (permalink)
CellM@n No Life Poster Join Date: Feb 2001 Location: Planet EARTH Age: 51 Posts: 1,209 Member: 3194 Status: Offline Thanks Meter: 41	Check quality of conection between antenna and PCB. ( You can try to push it hard when making a call ) If u can call succesfully, it seem u have bad connection. Usually, change the frame will solve the problem. hope help

03-01-2003, 02:32	#8 (permalink)
amir-cairo Freak Poster Join Date: May 2002 Location: egypt Age: 46 Posts: 238 Member: 11466 Status: Offline Thanks Meter: 0	@Springer who say that ? FDK = a connection to network u can`t make a connection if u have a failure on it i am sure by that tested 100%

03-01-2003, 04:34	#9 (permalink)
MaRiN Freak Poster Join Date: Nov 2000 Location: Croatia Age: 47 Posts: 353 Member: 2466 Status: Offline Thanks Meter: 10	My problem is in controling of antena switch! When I put new 100% working PA and antena switch (I tested on other phone) I still have this problem with loosing signal but when I remove antena switch and just connect 3 points of antena switch with wire my phone is working normaly. I want to know if it is bad for phone to work without antena switch, only with bypass? I heard that it is bad for PA. Is it truth? And how is controled antena switch? I think this is my problem.

03-01-2003, 04:53	#10 (permalink)
amir-cairo Freak Poster Join Date: May 2002 Location: egypt Age: 46 Posts: 238 Member: 11466 Status: Offline Thanks Meter: 0	ok man i am glad to konw that some one say that it is bad but.. i think that no bropleme if u do that couse if u make a connection u will have anttina and u haven`t anttena swich i mean u convert yr (anttina swich ) to (anttina ) some body correct me if i wrong best regardes

03-01-2003, 04:55	#11 (permalink)
amir-cairo Freak Poster Join Date: May 2002 Location: egypt Age: 46 Posts: 238 Member: 11466 Status: Offline Thanks Meter: 0	but i think that man yr broplem in FDK maybe work some time with bridge and bake agaim but i didn`t wanna that Regardes