C55 not communicating !!!!!!!!!! - GSM-Forum

motofreek · 12-19-2009, 03:24

HI, I'm trying to unlock a C55 using a cable I made but Joker isn't even recognising the phone !!!

What's wrong with my cable ?

Here's what I'm using...

A MOSFET rs232 level converter instead of a MAX232 and I'm connecting TX,RX and GND on the phone side to pins 2,3 and 4.

DB9 (2)-------|MOSFET transistor |-------> (3) phone side
(3)-------|rs232 level converter|-------->(4)
(5)-----------------------------------> (2)GND

What's wrong ?????????

dagos · 12-20-2009, 12:00

Quote:

Originally Posted by motofreek

HI, I'm trying to unlock a C55 using a cable I made but Joker isn't even recognising the phone !!!

What's wrong with my cable ?

Here's what I'm using...

A MOSFET rs232 level converter instead of a MAX232 and I'm connecting TX,RX and GND on the phone side to pins 2,3 and 4.

DB9 (2)-------|MOSFET transistor |-------> (3) phone side
(3)-------|rs232 level converter|-------->(4)
(5)-----------------------------------> (2)GND

What's wrong ?????????

...why you used MOSFET level converter? You need to use the only Max232 IC

Download from http://rapidshare.com/files/44149250/Service_cable.rar . You have anything!
dagos

motofreek · 12-21-2009, 11:51

Thanks Dagos for your reply and the link u shared.
The problem is in my country, I can't get a MAX232 or ST232 or any equivalent chip to buy ! That's why i used the two transistor level converter circuit. So you are saying that these level converters cannot work ?

Can i use any other alternaive besides max232/st232 ?

dagos · 12-27-2009, 12:40

Quote:

Originally Posted by motofreek

Thanks Dagos for your reply and the link u shared.
The problem is in my country, I can't get a MAX232 or ST232 or any equivalent chip to buy ! That's why i used the two transistor level converter circuit. So you are saying that these level converters cannot work ?

Can i use any other alternaive besides max232/st232 ?

...of course to not working. MAX232 transform CMOS levels -12Volts (0)...+12Volts (1) to 0...5Volts (TTL). But you need to know, MAX 232 inverted the signal (Input - 0...Output -1)...
I wil post one tranceiver schematic with the discret components.
dagos

12-19-2009, 03:24	#1 (permalink)
motofreek Junior Member Join Date: Jul 2007 Posts: 3 Member: 542524 Status: Offline Thanks Meter: 0	C55 not communicating !!!!!!!!!! HI, I'm trying to unlock a C55 using a cable I made but Joker isn't even recognising the phone !!! What's wrong with my cable ? Here's what I'm using... A MOSFET rs232 level converter instead of a MAX232 and I'm connecting TX,RX and GND on the phone side to pins 2,3 and 4. DB9 (2)-------\|MOSFET transistor \|-------> (3) phone side (3)-------\|rs232 level converter\|-------->(4) (5)-----------------------------------> (2)GND What's wrong ?????????

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12-21-2009, 11:51	#3 (permalink)
motofreek Junior Member Join Date: Jul 2007 Posts: 3 Member: 542524 Status: Offline Thanks Meter: 0	Thanks Dagos for your reply and the link u shared. The problem is in my country, I can't get a MAX232 or ST232 or any equivalent chip to buy ! That's why i used the two transistor level converter circuit. So you are saying that these level converters cannot work ? Can i use any other alternaive besides max232/st232 ?