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Go Back   GSM-Forum > GSM & CDMA Phones / Tablets Software & Hardware Area > Nokia > Nokia Hardware & Hardware Repair

Nokia Hardware & Hardware Repair all what you need for Hardware Repairing for Nokia Phones. Before writing any thread here try to check the Frequently Asked Questions Section.

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Old 08-18-2003, 07:23   #1 (permalink)
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8210 Network problem partially solved


Hi friends.

I have a 8210 which was getting network
i changed PA and removed antenna switch to use jumper solution.

What happens now is that it gets NETWORK on 1800MHz. It works more than perfectly i can say

BUT, on 900MHz the network bars goes ON anf OFF. Sometimes it gets network and other times it looses network on 900 MHz.

Please anyone can help me to solve this little problem

Before changing PA it did not got NETWORK on neither 1800MHz nor 900MHz.
Now it is working only on 1800 MHz.

can anyone help please

With Best Regards
Mehvishal
ICQ# : 175049963
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Old 08-18-2003, 11:46   #2 (permalink)
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this solution with jumpers is only for testing transmiter and
receiver and with carefull.the antenna switch have reason to be theare.it switching the antenna one time to receiver and after few microseconds to transmiter.
a t e n t i o n:antenna must not be conecting same time with receiver and transmiter you will damage your phone.for this reasonONT MAKE JUMPERS IN ANT.SWITCH AREA.
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Old 08-18-2003, 16:40   #3 (permalink)
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replace the antena switchm should be ok.. if not check pa, might faulty on 900mhz... or check all the caps, resistors on 900mhz lines...


regards

TMPC
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Old 08-18-2003, 21:29   #4 (permalink)
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Thanks my friends i will try to change antenna switch first then i will check other components.

Thanks once more,
i will post results later.
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Old 08-18-2003, 23:33   #5 (permalink)
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hi

hello
i think there is something wrong with the hagar
try to replace it with full flash
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Old 08-19-2003, 20:47   #6 (permalink)
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i will try to replace the hagar my friend.
But i am trying all other possibilities first.
Till now, nothing has changed. it's still getting network on 1800MHz and NOT on 900MHz.

Thanks a lot
i am still open to other answer my friends.
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Old 08-19-2003, 21:41   #7 (permalink)
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Quote:
Originally posted by platijet
this solution with jumpers is only for testing transmiter and
receiver and with carefull.the antenna switch have reason to be theare.it switching the antenna one time to receiver and after few microseconds to transmiter.
a t e n t i o n:antenna must not be conecting same time with receiver and transmiter you will damage your phone.for this reasonONT MAKE JUMPERS IN ANT.SWITCH AREA.
i think an****a switch make switch between bands.........
if we use cap insted jumper we have not need for an****a switc for 900mhz or 1800mhz coz we make our phone single band by jumper
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Old 08-23-2003, 01:26   #8 (permalink)
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When network goes up and down try to rehoot COBBA (V257B),or somethime in my praxis i change 26Mhz oscilator,somebody ask me why,he is only for power up example, but he is also wery important for HAGAR because he use 26Mhz for PLL:
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