8210 mbus r203 where is ? - GSM-Forum

robbe · 05-30-2003, 07:50

help quite urgent

hello all !

got a mbus which goes to 2V when 8210 turns on

if i use 10k to 5V externally it goes to 2.2V
but it does not pull down when protocol
initiates from Eeprom Tools (read command)

(i see 3 burst coming from PC but no answer from
8210 in between them)

I suspect the 8210 driver (transistor ?) is
bad.

anyone has schematics of 8210 side, mbus interface
i.e. r203 area ??

i`m trying to modify eeprom because phone is dead
after succesful full flash (1.00b dejan) of 8210
which was locked to provider.

btw. interfaces self built.

many many thanks

robbe

GSMWolf · 05-31-2003, 21:22

M-bus is conected to R203 and to CPU. R203 (4,7kOhm) is conected to Vbb. thats all.
schematic you can see in service manual level3, 03sysa3.pdf , page 4 ( CPU interface)
Wolf.

robbe · 06-02-2003, 08:01

many thanks,
then driver in the mbus in the cpu is damaged,

do you know if it's possible to flash the 8210
pcb only (only power and connections to m/fbus) ?

I will try to flash the 200000-400000 space, that includes the eeprom which I understand is
emulated in Flash ,
will it make the change to IMEI and other parameters ( using mbus) unnecessary ??

thanks again

robbe

05-30-2003, 07:50	#1 (permalink)
robbe Junior Member Join Date: May 2003 Location: italy Posts: 2 Member: 29896 Status: Offline Thanks Meter: 0	8210 mbus r203 where is ? help quite urgent hello all ! got a mbus which goes to 2V when 8210 turns on if i use 10k to 5V externally it goes to 2.2V but it does not pull down when protocol initiates from Eeprom Tools (read command) (i see 3 burst coming from PC but no answer from 8210 in between them) I suspect the 8210 driver (transistor ?) is bad. anyone has schematics of 8210 side, mbus interface i.e. r203 area ?? i`m trying to modify eeprom because phone is dead after succesful full flash (1.00b dejan) of 8210 which was locked to provider. btw. interfaces self built. many many thanks robbe

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05-31-2003, 21:22	#2 (permalink)
GSMWolf Freak Poster Join Date: May 2001 Location: Czech republic Posts: 142 Member: 4454 Status: Offline Thanks Meter: 0	M-bus is conected to R203 and to CPU. R203 (4,7kOhm) is conected to Vbb. thats all. schematic you can see in service manual level3, 03sysa3.pdf , page 4 ( CPU interface) Wolf.

06-02-2003, 08:01	#3 (permalink)
robbe Junior Member Join Date: May 2003 Location: italy Posts: 2 Member: 29896 Status: Offline Thanks Meter: 0	many thanks, then driver in the mbus in the cpu is damaged, do you know if it's possible to flash the 8210 pcb only (only power and connections to m/fbus) ? I will try to flash the 200000-400000 space, that includes the eeprom which I understand is emulated in Flash , will it make the change to IMEI and other parameters ( using mbus) unnecessary ?? thanks again robbe