8210 with very weak network - GSM-Forum

Scaramouche · 11-05-2002, 02:00

hey
ive got an 8210 with a very weak RX signal. In netmonitor is always around the -109 or totally gone. In Wintesal RSSI is around -120. This problem appears on both 900 / 1800 mhz. What could it be? I want to make sure what it is before I start blidnly replacing parts. TX is OK

willy · 11-05-2002, 06:42

Scaramouche ,

Check at AFC from Cobba , or AFC not under control !
it is TCXO problem or COBBA !

Willy

Quote:

Originally posted by Scaramouche
hey
ive got an 8210 with a very weak RX signal. In netmonitor is always around the -109 or totally gone. In Wintesal RSSI is around -120. This problem appears on both 900 / 1800 mhz. What could it be? I want to make sure what it is before I start blidnly replacing parts. TX is OK

Scaramouche · 11-05-2002, 07:56

Thanks willy, i will reball cobba & check again tomorrow

Scaramouche · 11-07-2002, 01:59

maaaan, have I had a bad day. I took the cobba off, reballed it, nad went to put it on. I must have used too much heat or liquid flux, because suddenly there was a loud pop & every capacitor in that large bank near cobba jumped right off the board.

. resoldered all 12 of them back, but now iam getting cobba parallel failure. Iam going to rework cobba again or change it. BUGGER

willy · 11-07-2002, 05:05

Scaramouche

first check all power supply VCOBBA and VBB !
and check PCM clock 13Mhz from MAD to COBBA !

willy

11-05-2002, 02:00	#1 (permalink)
Scaramouche Freak Poster Join Date: May 2002 Location: Perth, Western Australia Age: 45 Posts: 313 Member: 11937 Status: Offline Thanks Meter: 1	8210 with very weak network hey ive got an 8210 with a very weak RX signal. In netmonitor is always around the -109 or totally gone. In Wintesal RSSI is around -120. This problem appears on both 900 / 1800 mhz. What could it be? I want to make sure what it is before I start blidnly replacing parts. TX is OK

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11-05-2002, 07:56	#3 (permalink)
Scaramouche Freak Poster Join Date: May 2002 Location: Perth, Western Australia Age: 45 Posts: 313 Member: 11937 Status: Offline Thanks Meter: 1	Thanks willy, i will reball cobba & check again tomorrow

11-07-2002, 01:59	#4 (permalink)
Scaramouche Freak Poster Join Date: May 2002 Location: Perth, Western Australia Age: 45 Posts: 313 Member: 11937 Status: Offline Thanks Meter: 1	maaaan, have I had a bad day. I took the cobba off, reballed it, nad went to put it on. I must have used too much heat or liquid flux, because suddenly there was a loud pop & every capacitor in that large bank near cobba jumped right off the board. . resoldered all 12 of them back, but now iam getting cobba parallel failure. Iam going to rework cobba again or change it. BUGGER

11-07-2002, 05:05	#5 (permalink)
willy No Life Poster Join Date: Mar 2000 Location: inside NOKIA phone Age: 58 Posts: 1,677 Member: 1060 Status: Offline Thanks Meter: 10	Scaramouche first check all power supply VCOBBA and VBB ! and check PCM clock 13Mhz from MAD to COBBA ! willy