Hello everybody…
I’ve been years working with sim200, sim300 and sim340dz… But now I’m facing a problem.
I’m having some troubles with sim340DZ… It was working just fine… perfectly fine… Then one day it begins to reset itself after call ready is issued…
RDY
+CFUN: 1
+CPIN: READY
Call Ready
[10 seg after]
RDY
+CFUN: 1
+CPIN: READY
Call Ready
and so on… all day… It seems it resets when trying to register to the network…
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I allready check the power supply with oscilloscope… it remains steady…
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I’ve read in other post that it could be a BAND issue… they were having the same problem, change band and then it work fine. I’m having 2 problems whith band…
No matter if I have the SIM card inserted or not I get this errors:
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When trying to get band AT+CBAND? I get no reply from module… it seems like it crush… until it reset itself… If I input ANY other command module replys ok, but since I send the band command no matter what else I input from now it won’t reply anything. Command is spell ok I check that.
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When tryng to set band… I get +CME ERROR: 769 —> Can’t get control of request module…
One curious thing is that I hear a noise on the board (the same noise you hear when you put your cellphone near a speaker and you’re recieving/transmitting data, the interference noise) I guess the noise is at the coil of the power supply (it’s a switching type)… put some caps and now no noise…
Any help would be greatly appreciatted