How to check Vbatt line? - GSM-Forum

bbbbbb · 12-26-2003, 19:51

I have a dead 3310
In service manual I am advised to check C404,C202,C226,C227,C228 if there is 3.6V on these cappacitors. I have 3.6 on C202( I can not find 404 on PCB) but I do not have 3.6 voltage on C227. The voltage on C227, when I measure it, drops from 3.6V and remains in 1,7 V. Why? ANd how can I check Vbatt line?
Thanks for help

Medz · 12-26-2003, 21:48

Hi...

C404 is the smoother Cap of buzzer, it is under N400 the LED and
ring driver.
C227 is one of the smoothening Capacitors of the main line to the
ccont, the cause of the volt drop varies, it may be a leackage of 1
of the capacitors U mensioned , or failer of ccont it self or may be
it needs cleaning.
U can check the V-batt line by a mutimeter check the resistance
between +Ve and -Ve lines it must be higher than 1Mohm, and by
continuety meter check continuety between +Ve pin and other
+Ve points on the board ( buzzer pads, vibrator pads and Cap. U
mensioned ).

Destructor · 12-27-2003, 13:49

www.decoder.wz.cz

bbbbbb · 01-02-2004, 08:07

Thanks a lot for help

12-26-2003, 19:51	#1 (permalink)
bbbbbb Freak Poster Join Date: Aug 2003 Posts: 152 Member: 37416 Status: Offline Thanks Meter: 1	How to check Vbatt line? I have a dead 3310 In service manual I am advised to check C404,C202,C226,C227,C228 if there is 3.6V on these cappacitors. I have 3.6 on C202( I can not find 404 on PCB) but I do not have 3.6 voltage on C227. The voltage on C227, when I measure it, drops from 3.6V and remains in 1,7 V. Why? ANd how can I check Vbatt line? Thanks for help

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12-26-2003, 21:48	#2 (permalink)
Medz No Life Poster Join Date: Sep 2003 Age: 66 Posts: 807 Member: 39601 Status: Offline Thanks Meter: 13	Hi... C404 is the smoother Cap of buzzer, it is under N400 the LED and ring driver. C227 is one of the smoothening Capacitors of the main line to the ccont, the cause of the volt drop varies, it may be a leackage of 1 of the capacitors U mensioned , or failer of ccont it self or may be it needs cleaning. U can check the V-batt line by a mutimeter check the resistance between +Ve and -Ve lines it must be higher than 1Mohm, and by continuety meter check continuety between +Ve pin and other +Ve points on the board ( buzzer pads, vibrator pads and Cap. U mensioned ).

12-27-2003, 13:49	#3 (permalink)
Destructor No Life Poster Join Date: Apr 2003 Location: Crazy House Age: 41 Posts: 683 Member: 27606 Status: Offline Thanks Meter: 15	www.decoder.wz.cz

01-02-2004, 08:07	#4 (permalink)
bbbbbb Freak Poster Join Date: Aug 2003 Posts: 152 Member: 37416 Status: Offline Thanks Meter: 1	Thanks a lot for help